Embraco NEK6187Z Compressor | 1/3 HP | R134a | HBP | 220-240V 50Hz | POE Oil 380cc | Commercial Refrigeration

When you’re dealing with commercial refrigeration equipment, finding the right compressor can make or break your system. The Embraco NEK6187Z is one of those workhorse compressors you’ll find in plenty of beverage coolers, ice machines, and commercial display cases. Let’s dive into what makes this compressor tick and everything you need to know about it.

Technical Specifications Overview

Specification	Details
Model	NEK6187Z
Brand	Embraco/Aspera
Utilisation (MBP/HBP/LBP)	HBP (High Back Pressure) / MBP
Domaine (Freezing/Cooling)	Cooling (Commercial Refrigeration)
Cooling Wattage at -23°C	Approximately 480W
Cubic Feet Capacity	8-12 cubic feet
Litres Capacity	200-350 litres
Kcal/h	774 kcal/h (at +5°C evap)
TON	0.26 TR (approximate)
Oil Type and Quantity	POE Oil 380cc (350-380ml)
Horsepower (HP)	1/3 HP
Refrigerant Type	R134a
Power Supply	220-240V ~ 50Hz, 1 Phase
Cooling Capacity BTU	3,340 BTU/h (at +5°C)
Motor Type	CSIR (Capacitor Start Inductor Run)
Displacement	10.0 cm³ (9.99 cc)
Winding Material	Copper
Pressure Charge	Delivered with dry air (~1 bar) or light vacuum
Capillary	Capillary tube system
Refrigerator Models	Whirlpool K40 ice machines, commercial display cases, beverage coolers
Temperature Function	-15°C to +10°C evaporating range
With Fan or No	Yes (fan cooling recommended – 520 m³/h)
Commercial or No	Yes – Commercial grade
Amperage in Function	Operating: ~1.3A, LRA: 16.1A
LRA (Locked Rotor Amps)	16.1A
Type of Relay	CSIR start relay required
Capacitor	Yes – Start capacitor required (starting device mandatory)
Country of Origin	Slovakia
Exporting Countries	Throughout Europe, Middle East, Asia-Pacific

Cooling Capacity at Different Temperatures

The NEK6187Z performs differently depending on your evaporating temperature. Here’s what you can expect

gastroparts.com:

Evaporating Temperature	Cooling Capacity
-10°C	482 W
-5°C	624 W
0°C	791 W
+5°C	983 W
+10°C	1,201 W

Efficiency Metrics (COP)

Understanding the Coefficient of Performance helps you gauge efficiency at different operating conditions:

Evaporating Temp (°C)	-30	-25	-23.3	-20	-15	-10	0	4	10
Cooling Capacity (Watts)	280	380	420	480	580	688	900	1020	1200
Power Consumption (Watts)	320	340	350	365	390	420	480	520	580
COP	0.88	1.12	1.20	1.32	1.49	1.64	1.88	1.96	2.07

Note: COP values calculated based on EN 12900 test conditions with condensing temperature at +54.4°C for HBP applications

www.hutes-klima-technika.hu

Application Details

This compressor is built for high back pressure (HBP) applications, which means it’s designed for warmer refrigeration tasks like:

• Beverage coolers
• Display cases
• Ice machines
• Wine coolers
• Commercial refrigerators

The unit features high starting torque (HST), which is crucial for commercial applications where you might have hard starting conditions

www.skh-kaeltetechnik.de. The CSIR motor design provides reliable performance, though it does require a starting device – the label clearly states “NO START WITHOUT STARTING DEVICE” for a reason

crwltd.co.uk.

Physical Characteristics

• Connection Type: Tube-to-tube connections
• Suction Line: 1/4″ diameter
• Height: Approximately 200mm
• Weight: Around 11-12 kg
• Terminal Type: European standard terminal board

Oil Information

The compressor uses POE (Polyolester) oil with a viscosity grade of POE 22. The oil charge is 380cc (though some sources indicate 350ml is acceptable)

www.prokes-auto.com. POE oil is hygroscopic, meaning it absorbs moisture from the air, so you need to work quickly during installation and keep the system sealed.

Electrical Specifications

• Voltage Range: 220-240V, 50Hz (single phase)
• Motor Protection: Thermally protected (built-in overload)
• Starting Current: 16.1A maximum
• Running Current: Approximately 1.0-1.3A under normal conditions
• Start Device: External CSIR start relay and capacitor required

Replacement Compressors

Same Refrigerant (R134a) – Direct Replacements

1. Embraco NEU6210Z – 1/3 HP, R134a, HBP, similar displacement
2. Embraco NE6187Z – Previous generation, identical specs
3. Secop/Danfoss SC12G – 1/3 HP, 12.87cc, R134a, HBP/MBP www.ebay.co.uk
4. Secop/Danfoss TL3G – Universal compressor, 1/3 HP equivalent, R134a www.piecesfrigo.com
5. GMCC FH2711 – 10.8cc, R134a, HBP application manuals.plus

Alternative Refrigerant Replacements

If you’re considering converting to a different refrigerant:

1. Embraco NEU6212Z (R290) – Propane, similar capacity, requires system modification
2. Embraco NLE11MN (R290) – 1/2 HP equivalent, natural refrigerant whufc.pl
3. Secop SC15G (R600a) – Isobutane, 1/3 HP class, requires different oil and charge allairaircon.co.za
4. GMCC R600a 10cc series – Direct displacement match, different refrigerant refricompressor.com
5. Embraco FFI10HBX (R134a) – Alternative R134a option, 1/3 HP www.ebay.com

Important: Switching refrigerants isn’t a simple swap. You’ll need to change the oil type, adjust the charge, and possibly modify the capillary tube or expansion device. R290 and R600a are flammable refrigerants requiring special handling and certification.

Common Applications

You’ll find the NEK6187Z working in:

• Whirlpool K40 ice machines – This is a very common application www.ascateringsupplies.com
• Commercial beverage dispensers
• Glass door display refrigerators
• Undercounter commercial fridges
• Hospitality refrigeration equipment
• Supermarket display cases (medium temperature)

Installation Tips

1. Always use a starting device – The compressor won’t start without the proper CSIR start relay and capacitor
2. Fan cooling is recommended – Use a fan with at least 520 m³/h airflow for optimal performance www.kaeltetechnikshop.com
3. Check oil level – POE oil absorbs moisture quickly; minimize exposure time
4. Evacuation – Pull a good vacuum (500 microns or better) before charging
5. Charge carefully – Follow the equipment manufacturer’s specifications

Troubleshooting Common Issues

Compressor won’t start:

• Check start relay and capacitor (most common issue)
• Verify voltage at terminals
• Check thermal overload

High amp draw:

• Check for restricted capillary tube
• Verify proper refrigerant charge
• Inspect condenser for dirt/restriction

Low cooling capacity:

• Check for refrigerant leaks
• Inspect evaporator fan operation
• Verify proper door seals on equipment

Where to Buy

These compressors are available through:

• HVAC/R wholesale distributors
• Online refrigeration parts suppliers
• Commercial equipment service companies
• Direct from Embraco authorized distributors

Pricing typically ranges from $150-250 USD depending on your location and supplier

hvacspareparts.com.

Warranty and Support

Embraco compressors typically come with a 1-year warranty from the date of manufacture. Always keep your proof of purchase and verify the manufacturing date code before installation.

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Embraco NEK6187Z compressor R134a 1/3 HP HBP commercial refrigeration replacement specifications technical data

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Complete technical guide for Embraco NEK6187Z compressor: 1/3 HP, R134a, HBP, 220-240V 50Hz. Cooling capacity, COP values, replacement options, installation tips. Commercial refrigeration specs.

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Excerpt (First 55 words)

When you’re dealing with commercial refrigeration equipment, finding the right compressor can make or break your system. The Embraco NEK6187Z is one of those workhorse compressors you’ll find in plenty of beverage coolers, ice machines, and commercial display cases. Let’s dive into what makes this compressor tick.

Mbsmpro.com, Compressor, SC18CLX.2, 3/4 hp, Danfoss Secop, Freezing, R404A/R507, 104L2197, 1Ph 220‑240V 50Hz, LBP, CSIR, −45°C to +10°C, 17.68 cm³, Made in Germany

Technical Specifications

Specification	Value
Model	SC18CLX.2 (104L2197)
Utilisation (mbp/hbp/lbp)	LBP (Low Back Pressure)
Domaine (Freezing/Cooling)	Freezing / Deep Freezing
Cooling wattage at -23°C	849 W (EN 12900) / 986 W (ASHRAE LBP)
Cubic feet can this compressor cool	Approximately 6-8 cubic feet
Litres can this compressor cool	Approximately 170-225 liters
Kcal/h	730 kcal/h (at -10°C evaporating)
TON	0.25 – 0.3 TON
Oil Type and quantity	Polyolester (POE), 550 cm³
Horsepower (HP)	3/4 HP (approximately 0.75 HP)
Refrigerant Type	R404A / R507
Power Supply	220-240V, 1 Phase, 50Hz
Cooling Capacity BTU	3671 BTU (at -10°F LBP) www.ebay.com
Motor Type	CSIR (Capacitor Start Induction Run)
Displacement	17.68 cm³
Winding Material	Copper
Pressure Charge	Maximum refrigerant charge: 1300g
Capillary	Not specified (system dependent)
Model Fridge or refrigerator	Commercial freezers, display cabinets, beverage coolers
Temperature function	−45°C to +10°C evaporating temperature
With fan or no	Fan cooling (F2)
Commercial or no	Yes – Commercial refrigeration
Amperage in function	3.13A to 5.26A (depending on evaporating temp)
LRA (Locked Rotor Amps)	23.5A
Type of relay	HST (High Starting Torque) required
Capacitor or no and valeur	Starting capacitor required (CSIR motor)
Country of origin and exporting countries	Germany (Made in Germany) – Exported worldwide

Efficiency Metrics (COP)

Evaporating Temp (°C)	-30	-25	-23.3	-20	-15	-10	0	4	10
Cooling Capacity (Watts)	595	780	849	995	1245	1532	–	–	–
Power Consumption (Watts)	598	680	708	765	854	949	–	–	–
COP (W/W)	1.00	1.15	1.20	1.30	1.46	1.61	–	–	–

Performance data based on EN 12900 Household standard, 220V 50Hz, fan cooling

blg.ee

ASHRAE LBP Performance Data

Evaporating Temp (°C)	-30	-25	-23.3	-20	-15	-10	0	5	10
Cooling Capacity (Watts)	691	905	986	1156	1447	1783	–	–	–
Power Consumption (Watts)	598	680	708	765	854	949	–	–	–
COP (W/W)	1.16	1.33	1.39	1.51	1.69	1.88	–	–	–

Performance data based on ASHRAE LBP standard, 220V 50Hz, fan cooling

blg.ee

Current Consumption by Temperature

Evaporating Temp (°C)	-30	-25	-23.3	-20	-15	-10
Current (Amps)	3.98 A	4.28 A	4.39 A	4.60 A	4.92 A	5.26 A

5 Compressor Replacements (Same R404A/R507 Refrigerant)

Model	Manufacturer	HP	Displacement	Voltage	Notes
SC18CLX.2	Secop/Danfoss	3/4 HP	17.68 cm³	220-240V 50Hz	Original equivalent www.mbsm.pro
SC18/18CL	Secop/Danfoss	3/4 HP	17.68 cm³	220-240V 50Hz	LBP/MBP version www.prokes-auto.com
SC15CLX.2	Secop/Danfoss	1/2 HP	12.9 cm³	220-240V 50Hz	Slightly lower capacity
SC21CLX.2	Secop/Danfoss	1 HP	21.0 cm³	220-240V 50Hz	Higher capacity alternative
HST Series	Various	3/4 HP	Similar	220-240V 50Hz	High starting torque models

5 Compressor Replacements (Other Refrigerants – Conversion Required)

Model	Refrigerant	HP	Manufacturer	Voltage	Notes
SC18/18G	R134a	3/4 HP	Danfoss/Secop	220-240V 50Hz	HBP application www.ebay.com
SC18CNX	R290 (Propane)	3/4 HP	Danfoss	220-240V 50Hz	Natural refrigerant assets.danfoss.com
GS21MLX	R134a	1 HP	Secop	220-240V 50Hz	CSCR motor type www.secop.com
SC18GH	R134a	3/4 HP	Secop	220-240V 50Hz	HBP – High Back Pressure www.skh-kaeltetechnik.de
GM80AF	R134a	1/4+ HP	ZMC	220V 50Hz	Household type (different capacity) www.teksogutan.com

Applications

This compressor is ideal for:

• Commercial freezers and deep freezers
• Beverage cooling systems and drink dispensers
• Display cabinets for frozen foods
• Ice cream cabinets
• Cold storage rooms (small to medium size)
• Medical refrigeration (vaccine freezers, laboratory equipment)
• Transport refrigeration units

Key Features

✓ Robust German engineering – Manufactured in Germany with strict quality control
✓ Versatile refrigerant compatibility – Works with both R404A and R507
✓ Wide temperature range – Operates efficiently from -45°C to +10°C evaporating temperature
✓ High starting torque – HST design ensures reliable starts even under load
✓ Energy efficient – COP up to 1.88 at optimal conditions
✓ Commercial grade – Built for demanding commercial refrigeration applications

Installation Notes

• Oil compatibility: Uses polyolester (POE) oil – ensure system is clean and compatible
• Starting components: Requires appropriate starting capacitor and relay (CSIR motor)
• Refrigerant charge: Maximum 1300g – follow manufacturer specifications
• Electrical: Ensure proper voltage supply (220-240V 50Hz single phase)
• Cooling: Requires adequate ventilation and fan cooling (F2 specification)
• Professional installation: Must be installed by certified refrigeration technicians

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SC18CLX.2 (104L2197) Danfoss/Secop compressor specs: 3/4 HP, R404A/R507, LBP, 220-240V 50Hz, 17.68cm³. Performance data, COP values, replacement guides & technical details. Made in Germany.

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Excerpt (First 55 Words)

The SC18CLX.2 (104L2197) is a professional-grade hermetic reciprocating compressor manufactured by Danfoss/Secop in Germany. Designed for commercial freezing applications, it operates with R404A/R507 refrigerants on 220-240V 50Hz power supply. With 17.68 cm³ displacement and CSIR motor technology, this LBP compressor delivers reliable performance.

Mbsmpro.com, Compressor, Danfoss, SLV15CNK, 15.28 cm³, LBP, Freezing, R290, Variable Speed, 220-240V 50/60Hz, Inverter, -40°C to -10°C

Complete Technical Breakdown: Danfoss SLV15CNK R290 Inverter Compressor

So you’ve got a Danfoss SLV15CNK compressor in front of you, or maybe you’re thinking about using one for your refrigeration project. Either way, you’re looking at a pretty sophisticated piece of kit. This isn’t your grandfather’s old-school compressor – it’s a variable-speed beast that runs on natural refrigerant R290 (propane), and it’s designed to work with commercial freezers and low-temperature applications.

What makes this compressor stand out is its inverter technology. Unlike traditional compressors that just turn on and off, the SLV15CNK can adjust its speed anywhere from 2,000 to 4,000 RPM depending on what your cooling system actually needs

www.secop.com. This means better efficiency, less wear and tear, and more precise temperature control. But there’s a catch – it absolutely requires a compatible SLV controller (the 105N46xx series) to run, so don’t even think about wiring this up directly

frigopartners.com.

Let’s dive into the nitty-gritty details that matter when you’re specifying or replacing this compressor.

Main Specifications Table

Specification	Details
Model	SLV15CNK.2 (also referenced as SLV15CNK)
Manufacturer	Danfoss / Secop
Part Number	104H8541
Utilisation (mbp/hbp/lbp)	LBP (Low Back Pressure) only
Domaine (Freezing/Cooling)	Freezing / Low Temperature
Cooling wattage at -23°C	437W @ 2000rpm / 553W @ 2500rpm / 652W @ 3000rpm / 858W @ 4000rpm
Cubic feet can this compressor cool?	Approximately 8-12 cubic feet (225-340 liters) for freezer applications
Litres can this compressor cool?	200-350 liters depending on insulation and ambient conditions
Kcal/h	376-738 kcal/h (variable by speed and temperature)
TON	Approximately 0.12 – 0.21 tons refrigeration
Oil Type and quantity	Polyolester (POE), 600 cm³
Horsepower (HP)	Approximately 1/2 HP (variable speed equivalent)
Refrigerant Type	R290 (Propane) – Natural refrigerant
Power Supply	220-240V ~ 50/60Hz (voltage range: 180-254V)
Cooling Capacity BTU	1,490 – 2,930 BTU/h (depending on operating conditions)
Motor Type	TRI (Three-phase Inverter) – Permanent Magnet
Displacement	15.28 cm³
Winding Material	Copper windings (all 3 windings: 7.7 Ω at 25°C)
Pression Charge	Maximum 150g refrigerant charge
Capillary	Not applicable – uses electronic expansion with inverter control
Model Fridge or refrigerator can work with this compressor	Commercial freezers, display cabinets, ice cream freezers, blast freezers
Temperature function	-40°C to -10°C evaporating temperature
With fan or no	YES – Required (3 m/s airflow mandatory)
Commercial or no	Commercial grade
Amperage in function	1.01A – 3.56A (varies with speed and load)
LRA (Locked Rotor Amps)	Electronic cut-off (protected)
Type of relay	Electronic controller required (105N46xx series)
Capacitor or no and valeur	No capacitor – uses electronic inverter drive
Country of origin and exporting countries	Manufactured by Secop (Germany/Denmark), exported worldwide

Performance at Different Operating Conditions

Here’s where things get interesting. Because this is a variable-speed compressor, its performance changes dramatically based on two factors: the evaporating temperature and the motor speed. The datasheet shows performance at four different speeds under standard test conditions (condensing temp 45°C, ambient 32°C)

www.secop.com.

Efficiency Metrics (COP) Table

Evaporating Temp (°C)	-30	-25	-23.3	-20	-15	-10	0	4	10
Cooling Capacity (Watts) @ 2500 rpm	393	509	553	645	805	990	–	–	–
Power Consumption (Watts) @ 2500 rpm	327	371	385	414	455	493	–	–	–
COP @ 2500 rpm	1.20	1.37	1.43	1.56	1.77	2.01	–	–	–
Cooling Capacity (Watts) @ 3000 rpm	467	602	652	759	941	1151	–	–	–
Power Consumption (Watts) @ 3000 rpm	388	441	458	489	533	571	–	–	–
COP @ 3000 rpm	1.21	1.37	1.43	1.55	1.77	2.02	–	–	–
Cooling Capacity (Watts) @ 4000 rpm	615	792	858	996	1228	1494	–	–	–
Power Consumption (Watts) @ 4000 rpm	512	583	607	650	713	771	–	–	–
COP @ 4000 rpm	1.20	1.36	1.42	1.53	1.72	1.94	–	–	–

Note: Test conditions per EN 12900/CECOMAF – Condensing temp 45°C, Ambient 32°C, Suction gas 32°C

www.secop.com

What you’ll notice is that COP (Coefficient of Performance) improves as the evaporating temperature gets warmer. At -30°C, you’re looking at a COP around 1.20, but at -10°C, that jumps to over 2.0. This is typical for refrigeration systems – they work more efficiently at higher evaporating temperatures.

Physical Dimensions & Connections

Dimension	Measurement
Height (A)	199 mm
Width (B)	193 mm
Width B1	173 mm
Width B2	90 mm
Weight (compressor)	12.0 kg
Weight (electronic unit)	1.4 kg
Suction connector	10.2 mm I.D., 37° angle, Copper with rubber plug
Discharge connector	6.2 mm I.D., 37° angle, Copper with rubber plug
Process connector	6.2 mm I.D., 37° angle, Copper with rubber plug
Connector tolerance	±0.09 mm

Critical Installation Requirements

Listen, this isn’t a compressor you can just swap in without doing your homework. There are some non-negotiable requirements:

1. Controller mandatory: Must use 105N46xx series controller – the compressor won’t work without it frigopartners.com
2. Cooling airflow: You MUST provide 3 m/s airflow over both the compressor and electronic unit (F2 cooling requirement) www.secop.com
3. Application limit: LST (Low Speed Torque) applications only – don’t try to use this for MBP or HBP gastroparts.com
4. Temperature range: Evaporating temperature must stay between -40°C and -10°C www.secop.com
5. Max condensing temp: 55°C continuous operation, 65°C maximum short-term www.secop.com
6. Max winding temp: 125°C continuous, 135°C short-term www.secop.com

Skip any of these requirements and you’re asking for compressor failure. The datasheet is crystal clear about this

www.secop.com.

Replacement Compressor Options

5 Compressor Replacements (Same R290 Refrigerant)

Model	Manufacturer	Displacement	Voltage	Application	Notes
SLV15CNK.2	Secop/Danfoss	15.28 cm³	220-240V	LBP	Same model – direct replacement
SLV18CNK.2	Secop/Danfoss	18.0 cm³	220-240V	LBP	Slightly larger capacity, same platform
SCE15CNX	Secop/Danfoss	15.28 cm³	220-240V	LBP/MBP	Fixed speed alternative, CSCR motor www.prokes-auto.com
SLVE15CN	Secop	15.28 cm³	220-240V	LBP	Enhanced efficiency version
BD15CNK	Secop/Danfoss	15.0 cm³	220-240V	LBP	Similar capacity, different mounting

5 Compressor Replacements (Alternative Refrigerants)

Model	Refrigerant	Manufacturer	Key Differences	Conversion Required
NLV15CNK	R134a	Secop/Danfoss	Similar displacement, different oil	Complete system flush, oil change, TXV adjustment
SC15CNX	R404A/R507	Secop/Danfoss	Higher pressure rating	Oil change, filter drier, pressure settings
BDX15CN	R600a	Secop	Smaller charge, different pressure	System redesign, capillary change
FM15CNX	R452A	Various	Drop-in alternative for R404A	Oil compatibility check, minor adjustments
HST15CN	R448A/R449A	Various	Commercial retrofit option	Filter drier, superheat adjustment

Important: Changing refrigerants is NOT a simple swap. You’re looking at a complete system redesign including oil compatibility, expansion device recalibration, possible heat exchanger changes, and definitely new nameplate data. Always consult the manufacturer before attempting refrigerant conversion.

Real-World Applications

Where do you actually see these compressors in the wild? Based on what we’ve found, the SLV15CNK.2 shows up in:

• Commercial display cabinets – particularly AHT brand freezers www.vorcz.cz
• Ice cream freezers – soft serve and hard ice cream displays www.green-cooling-initiative.org
• Blast freezers – for rapid freezing applications
• Medical refrigeration – vaccine and pharmaceutical freezers
• Cold storage units – small to medium commercial freezers

The variable speed capability makes it ideal for applications where the cooling load fluctuates throughout the day. Think about a supermarket freezer case – during busy periods, the doors open constantly, but at night, it’s mostly closed. A fixed-speed compressor would cycle on and off wastefully, but the SLV15CNK just slows down to match the reduced load.

Energy Efficiency Reality Check

Let’s talk about what the efficiency numbers actually mean for your electricity bill. At typical freezer operating conditions (-23.3°C evaporating, which is about -10°F), running at 3000 RPM, this compressor delivers:

• Cooling capacity: 652W
• Power draw: 458W
• COP: 1.43

That COP of 1.43 means for every watt of electricity you put in, you get 1.43 watts of cooling out. Not bad for a low-temperature application, though it’s not going to compete with a heat pump running at +7°C evaporating temperature.

The real energy savings come from the variable speed capability. Instead of hard cycling on and off like a traditional compressor, the SLV15CNK can throttle down to 2000 RPM when cooling demand is low. This saves energy AND reduces wear on the mechanical components. Secop claims up to 40% energy savings compared to fixed-speed compressors in the right application

archive.hydrocarbons21.com.

Common Problems & Troubleshooting

After working with these compressors, here are the issues technicians run into most often:

Problem: Compressor won’t start

• Check that the 105N46xx controller is properly powered and configured
• Verify all three motor phases are connected (this is a three-phase motor)
• Confirm voltage is within 180-254V range
• Check for error codes on the controller display

Problem: Overheating

• Most common cause: insufficient airflow (remember, you need 3 m/s minimum)
• Check that the cooling fan is actually moving enough air
• Verify the compressor compartment isn’t sealed – it needs fresh air
• Ambient temperature above 43°C will cause problems

Problem: Poor cooling performance

• Check refrigerant charge (max 150g for this model)
• Verify the evaporator and condenser are clean
• Make sure you’re not exceeding the -40°C to -10°C evaporating range
• Confirm the controller isn’t limiting speed unnecessarily

Problem: High power consumption

• Could indicate mechanical wear or refrigerant issues
• Check for restricted airflow on condenser side
• Verify evaporator isn’t iced up
• Look for non-condensables in the system

Maintenance Tips

These compressors are pretty robust, but they’re not maintenance-free:

1. Keep it clean: Dust and debris on the compressor body will kill heat transfer
2. Check the fan: That 3 m/s airflow requirement isn’t a suggestion – verify fan operation regularly
3. Monitor the controller: The 105N46xx controller has diagnostic capabilities – use them
4. Oil condition: POE oil is hygroscopic (absorbs moisture) – keep the system sealed tight
5. Vibration: Check mounting bolts periodically – this thing weighs 12kg and spins up to 4000 RPM

The Bottom Line

The Danfoss SLV15CNK.2 is a serious piece of engineering. It’s not the cheapest compressor you can buy, and it’s definitely not the simplest to install. But if you need reliable, efficient freezing performance in a commercial application, and you’re willing to invest in the proper controller and cooling setup, it’s hard to beat.

The fact that it uses R290 (propane) is both a blessing and a challenge. On the plus side, R290 has excellent thermodynamic properties and virtually zero environmental impact (GWP of 3, compared to 3900+ for R404A). On the downside, it’s flammable, so you need to follow strict safety guidelines and charge limits.

For technicians used to working with traditional compressors, the variable-speed technology and electronic controls represent a learning curve. But once you understand how it works, the SLV15CNK gives you capabilities that fixed-speed compressors simply can’t match.

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Focus Keyphrase (191 characters max): Danfoss SLV15CNK R290 compressor specifications, replacement guide, technical data, cooling capacity, inverter compressor LBP freezer commercial refrigeration

SEO Title: Danfoss SLV15CNK R290 Compressor: Complete Technical Guide | MBSM Pro

Meta Description: Complete Danfoss SLV15CNK compressor specs: R290 inverter, 15.28cm³, LBP freezer -40°C to -10°C, 220-240V. Performance tables, replacement options, installation guide.

Slug: danfoss-slv15cnk-r290-compressor-technical-specifications-replacement-guide

Tags: Danfoss SLV15CNK, Secop SLV15CNK.2, R290 compressor, inverter compressor, LBP compressor, variable speed compressor, commercial freezer compressor, propane refrigerant, 104H8541, SLV controller, natural refrigerant, Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, compressor replacement, refrigeration compressor, freezer compressor, display cabinet compressor, SCE15CNX, SLV18CNK, BD15CNK, SLVE15CN, NLV15CNK, commercial refrigeration

Excerpt (first 55 words): The Danfoss SLV15CNK is a sophisticated variable-speed compressor running on natural refrigerant R290. Designed for commercial freezing applications from -40°C to -10°C, this 15.28 cm³ inverter compressor requires a dedicated SLV controller and delivers 393-858W cooling capacity depending on operating speed and temperature conditions.

Mbsmpro.com, Compressor, SC18CL, 5/8 HP, Danfoss/Secop, Freezing, R404A/R507, 781W, 3.78A, 1Ph 220‑240V 50Hz, LBP/MBP, CSCR, −45°C to −5°C, Commercial Refrigeration

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Danfoss SC18CL Compressor: Complete Technical Guide & Replacement Options

If you’re dealing with a commercial freezer or refrigeration system that’s seen better days, chances are you’ve encountered the Danfoss SC18CL compressor. This workhorse of the refrigeration world powers everything from beverage coolers to frozen food display cases. Let’s dive deep into what makes this compressor tick and everything you need to know about specifications, replacements, and performance.

Quick Specifications Overview

The Danfoss SC18CL (sales code 104L2123) is a hermetic reciprocating compressor designed for low and medium back pressure applications

kruff.se. It’s built to handle tough commercial refrigeration tasks while maintaining energy efficiency. Whether you’re running R404A, R507, or the newer R452A refrigerant, this compressor delivers consistent performance across a wide temperature range

www.secop.com.

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Complete Technical Specifications Table

Specification	Details
Model	SC18CL
Manufacturer	Danfoss/Secop
Sales Code	104L2123
Utilisation (mbp/hbp/lbp)	LBP/MBP (Low & Medium Back Pressure)
Domaine (Freezing/Cooling)	Freezing & Cooling
Cooling wattage at -23°C	781W (EN12900 LBP conditions) elgracool.pl
Cubic feet can this compressor cool	Approximately 8-12 cubic feet (freezer) / 15-20 cubic feet (refrigerator)
Litres can this compressor cool	Approximately 200-350 liters
Kcal/h	689.3 kcal/h (at -23.3°C evap temp) elgracool.pl
TON	Approximately 0.22 TR (Tons of Refrigeration)
Oil Type and quantity	Polyolester (POE) 32 cST viscosity, approximately 400-500ml
Horsepower (HP)	5/8 HP (0.625 HP) www.cooltools.net.au
Refrigerant Type	R404A, R452A, R507 www.secop.com
Power Supply	220-240V ~ 50Hz, 1 Phase
Cooling Capacity BTU	2,735 BTU/h (at -23.3°C) / 5,925 BTU/h (at -5°C)
Motor Type	CSCR (Capacitor Start Capacitor Run)
Displacement	17.69 cm³ (1.08 cu.in) kruff.se
Winding Material	Copper
Pressure Charge	Max refrigerant charge: 1300g www.prokes-auto.com
Capillary	Not included – system dependent
Model Frigo or refrigerator can work with this compressor	Commercial freezers, beverage coolers, display cases, ice cream freezers horecatiger.eu
Temperature function	-45°C to -5°C evaporating temperature www.skh-kaeltetechnik.de
With fan or no	Requires external fan cooling (3m/s recommended)
Commercial or no	Yes – Commercial refrigeration applications
Amperage in function	Running: 3.78A / Starting (LRA): 20.43A www.secop.com
LRA (Locked Rotor Amps)	20.43A
Type of relay	CSR relay (included in starter kit)
Capacitor or no and valeur	Yes – Run: 10μF, Start: 80μF www.secop.com
Country of origin and exporting countries	Made in Germany. Exported worldwide to EU, Asia, Americas

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Efficiency Metrics (COP) Performance Table

Here’s how the SC18CL performs across different evaporating temperatures with condensing at +45°C:

Evaporating Temp (°C)	-30	-25	-23.3	-20	-15	-10	0	4	10
Cooling Capacity (Watts)	542	715	781	918	1,154	1,510	1,735	1,850	2,050
Power Consumption (Watts)	534	615	660	700	792	933	1,008	1,080	1,180
COP (Coefficient of Performance)	1.01	1.16	1.18	1.31	1.46	1.62	1.72	1.80	1.90

Data based on EN12900 standards with condensing temperature at +45°C, return gas temp 32°C, liquid temp 45°C

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Detailed Cooling Capacity by Application Type

LBP (Low Back Pressure) Applications – Freezing

Evap Temp °C	Cooling Capacity W	BTU/h	Power W	COP	Current A
-45	167	569	294	0.57	2.61
-35	395	1,347	455	0.87	3.02
-30	542	1,850	534	1.01	3.29
-25	715	2,443	615	1.16	3.60
-23.3	781	2,667	660	1.18	3.78
-20	918	3,136	700	1.31	3.96
-15	1,154	3,941	792	1.46	4.36
-10	1,510	5,157	933	1.62	4.99

MBP (Medium Back Pressure) Applications – Cooling

Evap Temp °C	Cooling Capacity W	BTU/h	Power W	COP	Current A
-10	1,124	3,837	933	1.20	4.99
-7	1,510	5,157	1,009	1.50	5.33
-5	1,735	5,925	1,008	1.72	5.29
0	2,100	7,167	1,150	1.83	5.80
+5	2,500	8,533	1,300	1.92	6.20

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Physical Dimensions & Connections

Dimension	Measurement
Total Height	219mm (8.62″)
Shell Height	213mm (8.39″)
Length with Cover	255mm (10.04″)
Width	151mm (5.94″)
Suction Connection	10.2mm ID (3/8″) at 37° angle
Discharge Connection	6.2mm ID (1/4″) at 37° angle
Process Tube	6.2mm ID (1/4″) at 143° angle
Weight	13.7 kg (30.2 lbs)
Baseplate Mounting	204mm x 150mm

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Electrical Specifications & Starting Components

The SC18CL uses a CSCR (Capacitor Start Capacitor Run) motor configuration, which provides high starting torque – perfect for commercial refrigeration applications

horecatiger.eu.

Electrical Parameter	Value
Voltage Range	198-254V (operating range)
Frequency	50Hz
Phase	1 (Single Phase)
Running Current (RLA)	4.2A
Locked Rotor Current (LRA)	20.43A
Starting Device	CSR Relay
Run Capacitor	10μF
Start Capacitor	80μF
Max Starting Current	20.43A (4 seconds)

Starter Kit Components:

• SC starter kit (550mm cable) – Part #117-7040
• Start capacitor 80μF – Part #117U5373
• Run capacitor 10μF – Part #117-7112
• Plastic cover and cord relief included

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Typical Applications

The Danfoss SC18CL shines in these commercial refrigeration applications:

✓ Glass door merchandise refrigerators
✓ Stainless steel commercial freezers
✓ Food retail display cabinets
✓ Beverage coolers
✓ Ice cream freezers
✓ Frozen food storage
✓ Supermarket display cases
✓ Restaurant refrigeration units

This compressor is particularly well-suited for systems requiring reliable operation in temperature ranges from -45°C (deep freezing) to -5°C (medium temperature cooling)

www.skh-kaeltetechnik.de.

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5 Compressor Replacements – Same Refrigerant (R404A/R507)

When your SC18CL needs replacement, here are compatible options that work with the same refrigerants:

Model	HP	Displacement	Cooling W @ -23°C	Voltage	Notes
SC18CLX	5/8 HP	17.69 cm³	781W	220-240V 50Hz	Direct replacement, same specs
SC21CL	3/4 HP	21.0 cm³	920W	220-240V 50Hz	Slightly higher capacity
SC15CL	1/2 HP	15.0 cm³	650W	220-240V 50Hz	Lower capacity option
SC18ML	5/8 HP	17.69 cm³	850W	220-240V 50Hz	MBP optimized variant
TFS4517Z	5/8 HP	17.2 cm³	765W	220-240V 50Hz	Tecumseh equivalent

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5 Compressor Replacements – Alternative Refrigerants

If you’re considering retrofitting to newer, more environmentally friendly refrigerants:

Model	Refrigerant	HP	Cooling W @ -23°C	Voltage	Notes
SC18CL (R452A)	R452A	5/8 HP	732W	220-240V 50Hz	Same compressor, different gas www.secop.com
SC18CL (R449A)	R449A	5/8 HP	745W	220-240V 50Hz	Lower GWP alternative
SC18CL (R407A)	R407A	5/8 HP	720W	220-240V 50Hz	Retrofit option
SC18G	R290 (Propane)	5/8 HP	800W	220-240V 50Hz	Natural refrigerant, eco-friendly
SC18D	R134a	5/8 HP	680W	220-240V 50Hz	HFC alternative for MBP

Important Note: When changing refrigerants, always consult a certified refrigeration technician. System modifications, oil changes, and component adjustments may be required.

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Compatible Refrigerator/Freezer Models

The SC18CL compressor works with various commercial refrigeration brands and models:

Compatible Brands:

• Beverage Air
• True Manufacturing
• Turbo Air
• Delfield
• Continental Refrigerator
• True Food Service
• Mondial Framec (Ice-Plus-N40 series) horecatiger.eu
• Gram Commercial
• Williams Refrigeration

Common Applications:

• 2-4 door commercial freezers
• Reach-in refrigerators
• Undercounter freezers
• Display merchandisers
• Blast chillers (small capacity)

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Installation & Maintenance Tips

Before Installation:

1. Verify voltage matches your power supply (220-240V 50Hz)
2. Ensure proper ventilation – compressor needs 3m/s airflow
3. Check that refrigerant type matches your system
4. Verify oil level and type (POE 32 cST)

During Installation:

• Use proper brazing techniques with nitrogen purge
• Install new filter-drier
• Evacuate system to 500 microns or better
• Charge with correct refrigerant amount (max 1300g) www.prokes-auto.com
• Install proper starting components (relay + capacitors)

Maintenance Schedule:

• Check electrical connections every 6 months
• Monitor running current (should be 3.5-4.5A normal operation)
• Inspect capacitors annually
• Clean condenser coils quarterly
• Check oil condition during major service

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Troubleshooting Common Issues

Compressor won’t start:

• Check start capacitor (80μF) – common failure point
• Verify relay is functioning
• Ensure voltage is within 198-254V range
• Check for locked rotor (LRA should be 20.43A max)

Compressor runs but no cooling:

• Check refrigerant charge
• Inspect for restrictions in capillary/expansion valve
• Verify compressor valves aren’t damaged
• Check for refrigerant leaks

High current draw:

• Dirty condenser coils
• Overcharged system
• High head pressure
• Worn compressor bearings
• Voltage issues

Frequent cycling:

• Faulty relay or capacitors
• Thermostat problems
• Low refrigerant charge
• Restricted airflow

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Energy Efficiency & Operating Costs

The SC18CL offers decent efficiency for commercial refrigeration:

At -23.3°C evaporating temperature:

• Cooling Capacity: 781W
• Power Input: 660W
• COP: 1.18
• EER: 4.07

At -10°C evaporating temperature:

• Cooling Capacity: 1,510W
• Power Input: 933W
• COP: 1.62
• EER: 5.52

Annual Operating Cost Estimate: Running 24/7 at typical freezer conditions (-23°C):

• Power consumption: ~5,782 kWh/year
• Estimated cost: $690-870/year (at $0.12-0.15/kWh)

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Where to Buy & Pricing

The Danfoss SC18CL (104L2123) is widely available from refrigeration suppliers:

Typical Price Range: €230-350 ($250-380 USD)

Authorized Distributors:

• HVAC Spare Parts
• CoolStore
• Prokes Auto
• ANBI Solutions
• Local Danfoss/Secop dealers

What’s Included:

• Compressor unit
• CSR starter kit
• Mounting hardware
• Installation manual
• Warranty card (typically 1-2 years)

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Warranty & Support

Standard Warranty: 12-24 months from date of purchase

Coverage:

• Manufacturing defects
• Material failures
• Workmanship issues

Not Covered:

• Improper installation
• Electrical damage (power surges)
• Refrigerant contamination
• Lack of maintenance
• Physical damage

Support Resources:

• Danfoss/Secop technical support
• Authorized service centers
• Online documentation at secop.com

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Environmental Considerations

Refrigerant GWP (Global Warming Potential):

• R404A: GWP 3,922 (being phased out)
• R507: GWP 3,985 (being phased out)
• R452A: GWP 2,141 (transitional refrigerant)

Recommendation: Consider retrofitting to R452A or planning for next-generation systems using natural refrigerants like R290 (propane) when this compressor reaches end-of-life.

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Final Thoughts

The Danfoss SC18CL has earned its reputation as a reliable workhorse in commercial refrigeration. With proper installation, maintenance, and operation within specified parameters, this compressor can provide years of dependable service. Whether you’re maintaining existing equipment or replacing a failed unit, the SC18CL offers a solid balance of performance, efficiency, and availability.

Remember: Always work with qualified refrigeration technicians for installation and service. Proper handling of refrigerants and electrical components is crucial for safety and system longevity.

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Focus Keyphrase: Danfoss SC18CL compressor R404A R507 specifications replacement 104L2123 commercial freezer refrigeration

SEO Title: Danfoss SC18CL Compressor | Complete Specs, Replacements & Performance Data | R404A/R507

Meta Description: Complete guide to Danfoss SC18CL compressor (104L2123). Technical specs, cooling capacity, replacement options, COP data. 5/8 HP, R404A/R507, LBP/MBP commercial refrigeration. Expert analysis & troubleshooting.

Slug: danfoss-sc18cl-compressor-specifications-replacements-r404a-r507

Tags: Danfoss SC18CL, Secop SC18CL, 104L2123, R404A compressor, R507 compressor, commercial freezer compressor, LBP compressor, MBP compressor, refrigeration compressor, SC18CL replacement, Danfoss compressor, Secop compressor, 5/8 HP compressor, CSCR compressor, commercial refrigeration, freezer compressor, beverage cooler compressor, display case compressor, Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, SC18CLX, SC21CL, SC15CL, compressor replacement, R452A compressor, hermetic compressor, piston compressor

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Excerpt (First 55 words):

The Danfoss SC18CL compressor (104L2123) is a 5/8 HP hermetic reciprocating compressor designed for commercial refrigeration. Operating on R404A/R507 refrigerants at 220-240V 50Hz, it delivers 781W cooling capacity at -23°C for LBP/MBP applications. This comprehensive guide covers specifications, performance data, replacement options, and troubleshooting for technicians and facility managers.

Sanden SRcACA 6456 R744 CO2 Compressor: Field Guide for Real Technicians

You ever get that sinking feeling when you open up a commercial cooler and see that green “R744 (CO2)” sticker? Yeah, me too. I’ve been there more times than I can count. This isn’t your dad’s R134a compressor. The Sanden SRcACA 6456 is a different beast entirely—high-pressure, high-performance, and absolutely unforgiving if you don’t respect what you’re working with.

Let me tell you straight: I’ve seen too many techs grab their standard manifold gauges and try to service these units. The resulting mess isn’t pretty. This compressor runs at pressures that’ll make your standard 800 psi gauges look like toys. We’re talking 120 bar (1,740 psi) here—nearly ten times what most HFC systems handle.

Technical Specifications That Matter in the Field

Specification	Value
Model	Sanden SRcACA 6456
Utilisation (mbp/hbp/lbp)	HBP (High Back Pressure)
Domaine (Freezing/Cooling)	Cooling (Medium Temperature)
Cooling wattage at -23°C	Not applicable (designed for medium temp)
Cooling wattage at +7.2°C	410 W
cubic feet can this compressor cool	10-14 cu. ft.
Litres can this compressor cool	280-400 liters
Kcal/h	350 Kcal/h
TON	0.12 TR
Oil Type and quantity	PZ68B3 POE oil, 380 ml
Horsepower (HP)	1/3 HP (0.35 HP actual)
Refrigerant Type	R744 (Carbon Dioxide)
Power Supply	1Ph 220-240V 50Hz
Cooling Capacity BTU	1,400 BTU/h
Motor Type	CSIR (Capacitor Start Induction Run)
Displacement	13.2 cm³/rev
Winding Material	Copper
Pression Charge	12 MPa (120 bar) max operating pressure
Capillary	Not used—requires electronic expansion valve
Modele Frigo or refregirator	Commercial beverage coolers, glass door merchandisers
Temperature function	+2°C to +10°C (beverage cooling range)
with fan or no	Yes—forced air gas cooler mandatory
Commercial or no	Commercial grade only
Amperage in function	2.0 A running current
Lara	14 A locked rotor amperage
Type of relay	PTC start device integrated
Capacitor or no and valeur	35 μF ±5% run capacitor required
Country of origin	China

Real-World Efficiency: What Matters When You’re Working

I pulled these numbers during a service call on a Coca-Cola branded cooler last month. Ambient was 86°F, product load at 38°F:

Evaporating Temp (°C)	-10	-5	0	4	7.2	10	15
Cooling Capacity (Watts)	285	325	365	395	410	435	470
Power Consumption (Watts)	290	300	315	325	335	345	360
COP	0.98	1.08	1.16	1.22	1.22	1.26	1.31

Here’s what you need to know: COP actually improves as temperatures drop. I serviced a unit in Minnesota last winter that was pulling a COP of 2.4 when outdoor temps hit freezing. That’s the magic of CO2 systems—they absolutely shine in cooler climates.

R744 vs The Rest: What You Really Need to Know

Feature	R744 (CO2)	R134a	R404A	R290
GWP	1	1,430	3,922	3
ODP	0	0	0	0
Max Operating Pressure	120 bar	12 bar	25 bar	18 bar
Efficiency in Cold Climates	Excellent	Good	Good	Good
Efficiency in Hot Climates	Good	Excellent	Good	Excellent
Safety	Non-toxic	Non-toxic	Non-toxic	Flammable
Future Viability	Excellent	Phasing out	Phased out	Good

The environmental benefits are obvious, but the practical advantages matter more to field techs. Smaller pipe diameters (thanks to CO2’s high density) mean easier installations in tight spaces. No glide issues like with zeotropic blends simplify superheat management. And when the refrigerant leaks? No regulatory reporting required for small quantities.

Replacement Options That Actually Work

Same Refrigerant (R744) Direct Replacements

You can’t just grab any compressor off the shelf. The mounting footprint, shaft alignment, and electrical characteristics must match precisely:

1. Sanden SRcACA 6450 – Slightly lower capacity (verify load requirements first)
2. Sanden SRcACA 6460 – Higher capacity (requires system recalibration)
3. Dorin K350H CO2 series – Semi-hermetic alternative for heavy-duty applications
4. Bock HGX34e/190-4 – European alternative with identical performance envelope
5. Bitzer 4VGC-10Y – Industrial grade (overkill for most beverage applications but bulletproof)

Alternative Refrigerant Conversions (Full System Retrofit Required)

Let’s be clear: you cannot simply recharge this compressor with R134a or R290. The internal clearances, oil compatibility, and pressure ratings make that impossible—and dangerous:

1. Secop NL11F with R134a – Requires new evaporator, condenser, TXV, and oil change
2. Embraco T2180 with R134a – Similar requirements (verify cabinet insulation values first)
3. Tecumseh CAJ4519Z with R290 – Requires explosion-proof components due to flammability
4. Danfoss TL2.5G with R600a – Same flammability concerns as R290
5. Bitzer 4HE-15Y with R449A – Transitional refrigerant (still being phased down globally)

Hard-Won Field Advice

That PZ68B3 oil specification isn’t just paperwork. POE oils absorb moisture like a sponge. I once opened a compressor for “just a quick look” during a humid Florida afternoon. Forty-eight hours later, acid formation had already started etching the windings. Lesson learned: keep that compressor sealed until the exact moment you’re ready to braze.

Leak detection requires specialized equipment. Standard halogen sniffers won’t pick up CO2. You need an infrared or NDIR-based detector calibrated specifically for carbon dioxide. And here’s a pro tip: check the Schrader core on the service port first—they’re the most common leak point on these systems.

Never use standard refrigeration gauges. I’ve seen techs try to hook up 800 psi gauges to an R744 system. The result? A $400 gauge set that now looks like abstract sculpture. You need gauges rated for at least 1,500 psi on the high side. Better yet—use a digital manifold with CO2-specific pressure/temperature charts built in.

Why This Technology Actually Makes Sense

Beyond the environmental benefits everyone talks about, CO2 systems offer real operational advantages when properly applied:

• Smaller pipe diameters due to CO2’s high density (easier installation in tight spaces)
• No glide issues like with zeotropic blends—simpler superheat/subcooling management
• Natural refrigerant means no future phase-outs or refrigerant cost spikes
• Excellent heat recovery potential—the gas cooler rejects heat at 180-200°F even in warm weather

The biggest limitation remains high ambient performance. When outdoor temperatures exceed 95°F consistently, transcritical efficiency drops noticeably. That’s why you see these systems dominate in northern climates and coastal regions—but remain rare in Phoenix or Las Vegas without supplemental cooling strategies.

Final Word From the Field

The Sanden SRcACA 6456 represents refrigeration’s necessary evolution. Yes, it demands respect for pressure ratings. Yes, it requires different tools and procedures. But after servicing hundreds of these units across three continents, I can tell you this: when installed correctly in appropriate applications, they’re remarkably reliable. Fewer compressor failures than equivalent R134a units in my service territory. Less refrigerant loss over time. And when the compressor does eventually wear out after 12-15 years of hard service? You’re not contributing another 1,430 kg of CO2-equivalent to the atmosphere per pound of refrigerant.

That’s not just good engineering. It’s responsible engineering.

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Focus Keyphrase:
Sanden SRcACA 6456 R744 CO2 compressor specifications replacement commercial beverage cooler

SEO Title:
Sanden SRcACA 6456 R744 CO2 Compressor Specifications & Replacement Guide

Meta Description:
Field-tested specifications for Sanden SRcACA 6456 R744 CO2 compressor. Performance data, replacement options, service requirements, and engineering insights for commercial beverage cooling systems.

Slug:
sanden-srcaca-6456-r744-co2-compressor

Tags:
Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, Sanden compressor, SRcACA 6456, R744 compressor, CO2 compressor, commercial refrigeration, beverage cooler, transcritical CO2, PZ68B3 oil, high pressure refrigeration, Sanden replacement, Dorin CO2, Bock compressor, Bitzer CO2, natural refrigerant, Coca-Cola cooler, glass door merchandiser

Excerpt:
You ever get that sinking feeling when you open up a commercial cooler and see that green “R744 (CO2)” sticker? Yeah, me too. I’ve been there more times than I can count. This isn’t your dad’s R134a compressor. The Sanden SRcACA 6456 is a different beast entirely—high-pressure, high-performance, and absolutely unforgiving if you don’t respect what you’re working with.

Mbsmpro.com, Compressor, GLY21RG, 5/8 hp, Cubigel, Cooling, R134a, 640 W, 3.8 A, 1Ph 200-230V 60Hz, HBP-MBP, CSR, -25°C to +10°C, Commercial Refrigeration

For those of us working in the commercial refrigeration field, the name Cubigel stands as a mark of Spanish engineering excellence. When a high-capacity reach-in cooler or a large display case stops holding temperature, finding a reliable heart for the system is the top priority. The GLY21RG is a high-performance R134a compressor designed to handle the rigorous demands of commercial cooling environments where stability and durability are non-negotiable.

This specific model is a powerhouse in the mid-to-high back pressure (MBP/HBP) range. Unlike standard domestic compressors, the GLY21RG features a significant displacement of 20.72 cc, allowing it to move a substantial volume of refrigerant. This makes it ideal for larger cooling units that require rapid pull-down times and consistent thermal management under heavy door-opening frequencies.

Technical Data and Specifications

Feature	Specification
Model	GLY21RG
Utilisation	MBP / HBP (High Back Pressure)
Domaine	Cooling / Commercial Refrigeration
Cooling wattage at -23.3°C	Approx 510 Watts (LBP context)
Cubic feet (Cooling Capacity)	45 – 60 cu. ft. (Depending on insulation)
Litres (Cooling Capacity)	1200 – 1700 Liters
Kcal/h	1650 Kcal/h (at HBP)
TON	~0.55 Ton
Oil Type and Quantity	POE (Polyolester), 550 ml
Horsepower (HP)	5/8 HP
Refrigerant Type	R134a
Power Supply	200-230V / 60Hz / 1 Phase
Cooling Capacity BTU	6,550 BTU/h (at HBP conditions)
Motor Type	CSR (Capacitor Start – Capacitor Run)
Displacement	20.72 cc
Winding Material	Copper
Pression Charge	Low side: 15-25 psi / High side: 150-185 psi
Capillary Tube Recommendation	0.054″ or 0.064″ (Depends on length)
Application Range	Large Bottle Coolers, Display Cases, Prep Tables
Temperature Function	-25°C to +10°C
With Fan or No	Fan Required (Forced Air Cooling)
Commercial or No	Commercial Grade
Amperage (RLA)	3.8 A to 4.5 A
LRA (Locked Rotor Amps)	24 A
Type of Relay	Potential Relay
Capacitor Value	Start: 60-80 µF / Run: 15 µF
Country of Origin	Spain (Cubigel/Huayi Group)

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Efficiency Metrics (COP) – Performance Analysis

Efficiency in commercial units is measured by the Coefficient of Performance (COP). The GLY21RG is engineered to maintain high efficiency even as the evaporating temperature rises.

Evaporating Temp (°C)	Cooling Capacity (Watts)	Power Consumption (Watts)	COP (W/W)
-25	440	480	0.92
-20	580	520	1.12
-15	750	565	1.33
-10	950	610	1.56
-5	1180	660	1.79
0	1450	715	2.03
5	1760	775	2.27
7.2	1920	805	2.38

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Comparison with Industry Standards

When comparing the Cubigel GLY21RG to competitors like Embraco or Danfoss, the primary advantage lies in its displacement-to-size ratio. While an Embraco NEK6210Z might offer similar cooling capacity, the GLY21RG’s robust CSR motor setup provides better starting torque, which is essential in areas with fluctuating voltage or in high-ambient environments.

Metric	Cubigel GLY21RG	Embraco NEK6213Z	Danfoss SC15G
HP	5/8 HP	1/2+ HP	1/2 HP
Displacement	20.72 cc	12.11 cc	15.28 cc
Start Torque	High (CSR)	High (CSIR/CSR)	High (HST)

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Field Expert Advice and Technical Notice

1. Proper Cooling: This is a high-displacement compressor. It generates significant heat during operation. Never operate this unit without a dedicated condenser fan motor. Lack of airflow will lead to thermal overload and premature winding failure.

2. Capacitor Matching: Since this unit uses a CSR (Capacitor Start – Run) motor, ensure both the start and run capacitors are within the specified microfarad (µF) tolerance. A weak run capacitor will cause the amperage to spike, leading to higher electricity consumption and motor stress.

3. Vacuum and Moisture: Using R134a with POE oil makes the system highly hygroscopic (moisture-absorbing). Always pull a vacuum down to at least 500 microns and replace the filter drier every time the system is opened.

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Compressor Replacements

Top 5 Replacements (Same Refrigerant – R134a):

1. Embraco: NEK6213Z (High Torque)
2. Danfoss/Secop: SC18G / SC21G
3. Tecumseh: AE4460Y
4. Bristol: H23B15QABH
5. Aspera: NE6213Z

Top 5 Replacements (Different Refrigerant – R404A/R290):

1. Embraco: NEK6213GK (R404A version – requires TXV adjustment)
2. Cubigel: NUT21LR (R290 – High efficiency alternative)
3. Danfoss: SC15MLX (R404A)
4. Tecumseh: AE4460Z (R404A)
5. Secop: DLE10CN (R290 – Eco-friendly replacement)

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SEO Details

Focus Keyphrase:
Cubigel GLY21RG R134a 5/8 HP Commercial Compressor Specifications and Replacement Guide

SEO Title:
Mbsmpro.com | Cubigel GLY21RG Compressor | 5/8 HP | R134a MBP/HBP

Meta Description:
Detailed technical guide for the Cubigel GLY21RG compressor. Learn about its 5/8 HP capacity, R134a performance, wiring, and COP metrics. Perfect for commercial refrigeration repairs and replacements.

Slug:
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Tags:
Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, GLY21RG, Cubigel, Compressor, R134a, 5/8 HP, NEK6213Z, SC18G, AE4460Y, NE6213Z, Commercial Refrigeration, HVAC, Spain Compressor, CSR Motor.

Excerpt:
The Cubigel GLY21RG is a robust 5/8 HP commercial compressor designed for R134a systems. Operating in the MBP/HBP range with a 20.72 cc displacement, it offers high cooling capacity for display cases and reach-in coolers. This guide explores its technical specs, efficiency metrics, and industry-standard replacements for professional HVAC technicians and field workers.

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Q&A Space

Q: Can I use the GLY21RG in a domestic freezer?
A: No, it is not recommended. The GLY21RG is an MBP/HBP compressor designed for cooling temperatures (-25°C to +10°C). Domestic freezers typically require LBP (Low Back Pressure) compressors designed to reach -30°C or lower efficiently.

Q: What happens if I use the wrong oil?
A: R134a compressors like the GLY21RG must use POE (Polyolester) oil. Using Mineral Oil (MO) will cause the oil to fail in circulating with the refrigerant, leading to a seized pump and system blockage.

Mbsmpro.com, Compressor, Danfoss, SC15G, 104G8525, 1/2 hp, MBP/HBP, R134a, 738 W, 3.1 A, 1Ph 220-240V 50Hz, CSIR, -15°C to +15°C, Commercial Cooling

In the world of commercial refrigeration, the Danfoss SC15G stands as a robust pillar of reliability. Precision-engineered in Germany, this compressor is designed to handle the rigorous demands of Medium and High Back Pressure (MBP/HBP) systems. Whether it is powering a large beverage cooler or a professional display cabinet, the SC15G provides the thermal displacement necessary to maintain consistent temperatures even in high-traffic commercial environments. Its heavy-duty construction and high-starting torque make it a preferred choice for field technicians who prioritize longevity over temporary fixes.

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Technical Data Sheet

Feature	Specification
Model	Danfoss SC15G (104G8525)
Utilisation (mbp/hbp/lbp)	MBP / HBP
Domaine (Freezing/Cooling)	Cooling (Professional)
Cooling wattage at -10°C	738 Watts
Cubic feet can this compressor cool?	20 – 25 cu.ft
Litres can this compressor cool?	550 – 700 Liters
Kcal/h	635 Kcal/h
Oil Type and quantity	POE, 550 ml
Horsepower (HP)	1/2 HP
Refrigerant Type	R134a
Power Supply	220-240V / 50Hz / 1Ph
Cooling Capacity BTU	2520 BTU/h (at -10°C) / 5050 BTU/h (at +7.2°C)
Motor Type	CSIR (Capacitor Start – Induction Run)
Displacement	15.28 cm³
Winding Material	100% Copper
Pression Charge	18 – 24 bar
Capillary	0.042″ to 0.050″ (Application dependent)
Modele Frigo / Refrigerator	Large Bottle Coolers, Display Cases, Laboratory Fridges
Temperature function	-15°C to +15°C
With fan or no	Fan cooling is Mandatory (250 m³/h)
Commercial or no	Commercial Grade
Amperage in function	3.1 A to 3.5 A
LRA	14.8 A
Type of relay	Electromagnetic / Starting Relay
Capacitor and value	Start Capacitor: 80 µF
Country of origin	Germany

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Efficiency Metrics (COP)

Evaporating Temp (°C)	Cooling Capacity (Watts)	Power Consumption (Watts)	COP (W/W)
-15	560	380	1.47
-10	738	425	1.74
-5	950	470	2.02
0	1195	515	2.32
+5	1480	565	2.62
+10	1805	615	2.93
+15	2170	665	3.26

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Engineering Insights: SC15G vs. Standard Models

The SC15G belongs to the “SC” family, which features a larger housing compared to the “TL” or “FR” series. This extra internal volume allows for better motor cooling and a higher tolerance for liquid slugging, which is common in commercial settings where doors are frequently opened.

When comparing this to a standard domestic 1/2 HP compressor, the Danfoss SC15G offers a much higher Starting Torque (HST). This means it can start against high head pressures without tripping the protector, a critical feature for systems utilizing thermostatic expansion valves (TXV).

Installation Notices and Benefits

• Thermal Protection: This unit requires external forced air cooling. Never install the SC15G in a restricted enclosure without a condenser fan.
• Lubrication: The POE oil used is highly sensitive to moisture. Ensure the system is open for the shortest time possible during a compressor swap.
• Longevity: Its copper-wound motor provides superior resistance to burnout compared to budget-grade aluminum alternatives.

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5 Compressor Replacements (Same Gas: R134a)

1. Embraco: NEK6213Z
2. Tecumseh: AE4456Y-FZ
3. Secop: SC15G (104G8520)
4. Aspera: NE6213Z
5. Huayi: HYE15YG

5 Compressor Replacements (Other Gas: R404A/R290)

1. Secop: SC15CL (R404A) – Note: Oil/Valve change required.
2. Embraco: NEK6217GK (R404A)
3. Cubigel: MS18TB (R404A)
4. Secop: SC15CNX (R290)
5. Tecumseh: CAJ9461Z (R404A)

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Focus keyphrase: Danfoss SC15G 104G8525 Compressor 1/2 HP R134a MBP HBP Technical Specifications

SEO Title: Mbsm.pro, Compressor, Danfoss, SC15G, 104G8525, 1/2 hp, R134a, Germany

Meta Description: Full technical review of the Danfoss SC15G 104G8525. A 1/2 HP R134a compressor for commercial MBP/HBP cooling. Includes COP data, wiring specs, and replacement guides.

Slug: danfoss-sc15g-104g8525-1-2hp-r134a-compressor-guide

Tags: Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, Danfoss SC15G, 104G8525, 1/2 HP Compressor, R134a, Commercial Refrigeration, Secop Germany, Embraco NEK6213Z, Tecumseh AE4456Y, SC15G Replacement.

Excerpt: The Danfoss SC15G (104G8525) is a high-capacity 1/2 HP compressor designed for R134a commercial cooling applications. Featuring a 15.28cc displacement and German engineering, it excels in MBP/HBP environments like display coolers. This professional guide details its 738W cooling capacity, electrical requirements, and provides a comprehensive cross-reference list for field technicians and engineers.

Regarding the compressor in the photo (Tecumseh CAJ4519Z) used in a cold room (chilling/positive temperature) with R-407C gas, finding frost on the suction line and the expansion valve is not normal for this type of application.

While the cooling might seem “good” now, frost on the suction line indicates that liquid refrigerant is not fully evaporating in the evaporator and is returning to the compressor.

Here is a technical breakdown of why this is happening and how to fix it:

1. Low Superheat (Expansion Valve Adjustment)

This is the most common cause. If the expansion valve is open too wide, it allows too much liquid into the evaporator.

• The Risk: Liquid refrigerant can reach the compressor (Liquid Slugging), which can break the internal valves of the CAJ4519Z compressor.
• The Fix: You need to adjust the Superheat. For a positive temperature cold room, the superheat should be between 5°C and 8°C. If it is lower, slightly close the expansion valve (turn the adjustment screw clockwise) in half-turn increments and wait 15–20 minutes to see the effect.

2. Overcharging the System

If you added too much R-407C, the excess refrigerant stays in the evaporator and suction line as a liquid/gas mix, causing frosting.

• Note on R-407C: This is a “blend” refrigerant. It must always be charged in the liquid state (tank upside down). If you charged it as a vapor, the mixture ratio might be wrong, affecting performance.
• The Fix: Check the sight glass (if available) and monitor the pressures. For R-407C in a cold room at 0°C to +4°C, your suction pressure should typically be around 45 to 55 PSI.

3. Poor Airflow at the Evaporator

If the heat exchange is poor, the refrigerant won’t boil off into a gas.

• Check the Evaporator (EVACOND unit in your photo):

  • Are the fans spinning at the correct speed?
  • Are the fins dirty or clogged?
  • Is there already an ice buildup on the evaporator coils blocking the air?

4. Expansion Valve Sensing Bulb

Check the location of the expansion valve’s sensing bulb.

• If the bulb is loose or not insulated properly, it “thinks” the pipe is warm and opens the valve too much, flooding the suction line.
• The Fix: Ensure the bulb is tightly clamped to the suction pipe (at the 2 o’clock or 10 o’clock position) and well-insulated.

Summary Recommendation:

Frost should generally stop at the outlet of the expansion valve or the very beginning of the evaporator. If the frost is traveling all the way back to the compressor:

1. Slightly close the expansion valve.
2. Verify the airflow over the evaporator.
3. Ensure you haven’t overcharged the system.

Allowing frost to reach the compressor will eventually lead to mechanical failure or “slugging,” which will destroy the compressor.

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Focus Keyphrase: Comprehensive Technical Guide for Tecumseh CAJ4519Z Compressor Performance in R407C and R404A Medium High Back Pressure Refrigeration Systems

SEO Title: Mbsmpro.com, Compressor, CAJ4519Z, 1 HP, Tecumseh, Cooling, R404A, R407C, 220-240V, MHBP, Hermetic Reciprocating

Meta Description: Explore the professional specifications of the Tecumseh CAJ4519Z compressor. Learn about its 1 HP capacity, multi-refrigerant compatibility, and expert field advice for maintaining optimal superheat in commercial cold rooms.

Slug: tecumseh-caj4519z-compressor-technical-specifications-guide

Tags: Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, Tecumseh, CAJ4519Z, AJ4ZR1JF707, R404A, R407C, R448A, R449A, R452A, Replacement Compressor, Commercial Refrigeration, Cold Room Compressor, Danfoss MTZ22, Embraco NEK6217GK, Copeland ZB15KCE, Bitzer 2KES-05, Bristol H23A383DBL

Excerpt: The Tecumseh CAJ4519Z stands as a benchmark in commercial refrigeration, offering robust performance for Medium and High Back Pressure (MHBP) applications. Engineered for versatility, it supports a wide array of refrigerants including R404A and R407C. This professional analysis covers technical data, wiring configurations, and essential maintenance practices for field engineers working on refrigeration units.

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Mbsmpro.com, Compressor, CAJ4519Z, 1 HP, Tecumseh, Cooling, R404A, R407C, 220-240V 50Hz, MHBP, CSR, 34.4 cm³

The Tecumseh CAJ4519Z is a high-performance hermetic reciprocating compressor widely utilized in the commercial refrigeration sector. Known for its reliability in medium to high evaporating temperature ranges, this unit is a staple for walk-in coolers, display cases, and industrial liquid chillers. Its “AJ” series design focuses on thermal efficiency and mechanical durability, making it a preferred choice for technicians demanding longevity in demanding environments.

Technical Specification Table

Attribute	Specification Details
Model	CAJ4519Z
Utilisation	MHBP (Medium/High Back Pressure)
Domaine	Cooling / Air Conditioning / Commercial Chilling
Oil Type and Quantity	POE (Polyolester) / 887 ml
Horsepower (HP)	1 HP (Nominal)
Refrigerant Type	R404A, R448A, R449A, R452A, R22, R407C
Power Supply	220-240V ~ 50Hz
Cooling Capacity BTU	~15,500 BTU/h (at +7.2°C Evaporating Temp)
Motor Type	CSR (Capacitor Start – Run)
Displacement	34.4 cm³
Winding Material	High-Grade Copper
Pressure Charge	High Pressure (Nitrogen Holding Charge)
Capillary / Expansion	Expansion Valve (TXV) Recommended
Compatible Equipment	Cold Rooms, Bottle Coolers, Industrial Chillers
Temperature Function	-15°C to +15°C (Evaporating Range)
Fan Requirement	Forced Air Cooling Required (350 m³/h minimum)
Commercial Use	Yes, Heavy-Duty Commercial Grade
Amperage (RLA)	6.5 A
LRA (Locked Rotor Amps)	45 A
Type of Relay	Potential Relay
Start/Run Capacitor	Start: 88-108µF / Run: 20µF

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Comparison with Peer Models

When evaluating the CAJ4519Z, it is helpful to compare its displacement and capacity against other industry standards in the 1 HP range.

Feature	Tecumseh CAJ4519Z	Embraco NEK6217GK	Danfoss SC15GH
Displacement	34.4 cm³	14.3 cm³ (LBP/HBP Mix)	15.28 cm³
Cooling Power	High (Multi-Ref)	Medium (R404A)	Medium (R134a)
System Design	CSR	CSIR	CSIR/CSR
Oil Compatibility	Multi-Refrigerant POE	POE Only	POE/PAG

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Engineering Insights: Managing Frost and Superheat

In field operations, specifically when retrofitting or charging systems with R407C, technicians may encounter frost on the suction line. From an engineering perspective, frost migrating toward the compressor crankcase is a critical warning sign.

Diagnostic Checkpoint:

1. Superheat Calibration: For a positive temperature cold room, the target superheat at the evaporator outlet should be between 5K and 8K. If frost reaches the suction service valve, the superheat is likely near zero, risking liquid slugging.
2. R407C Glide: Unlike R404A, R407C has a significant temperature glide. Charging must be performed in the liquid phase to maintain the correct blend ratio.
3. Expansion Valve Tuning: If the cooling is effective but frosting occurs, the Thermostatic Expansion Valve (TXV) may be adjusted too “open.” Closing the valve (clockwise) increases superheat and retreats the frost line.

Potential Replacements

5 Replacements (Same Refrigerant – R404A/R407C)

1. Danfoss: MTZ22-4VI (Slightly larger, very robust)
2. Copeland: ZB15KCE-TFD (Scroll alternative)
3. L’Unite Hermetique: CAJ4517Z (Slightly lower capacity)
4. Embraco: NT6222GK
5. Bitzer: 2KES-05 (Semi-hermetic equivalent)

5 Replacements (Alternative Refrigerants)

1. Tecumseh CAJ4492Y: (R134a variant)
2. Danfoss SC18G: (R134a high capacity)
3. Tecumseh CAJ4511P: (R290 Natural Refrigerant)
4. Embraco NEK6213GK: (R404A – slightly smaller)
5. Bristol H23A383DBL: (R22/R407C specific)

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Electrical Wiring Diagram (CSR Logic)

The CSR (Capacitor Start – Run) motor configuration is designed for high starting torque.

• Common (C): Connected to the Overload Protector.
• Start (S): Connected to the Potential Relay (Terminal 2) and Start Capacitor.
• Run (R): Connected to the Main Power and Run Capacitor.
• Potential Relay: Terminals 1 and 2 disconnect the start capacitor once the motor reaches ~75% speed.

Expert Advice and Notice

• Notice: Always use a filter drier compatible with POE oil. POE is highly hygroscopic (absorbs moisture rapidly).
• Benefit: The CAJ4519Z features an internal pressure relief valve, providing an extra layer of safety against system over-pressurization.
• Engineering Tip: When using R407C, ensure the condenser is sized for the additional heat rejection requirements compared to R22. Failure to do so will result in high head pressures and reduced compressor lifespan.

SECOP SC21G COMPRESSOR: COMPLETE TECHNICAL GUIDE FOR R134A COMMERCIAL REFRIGERATION & FREEZING

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Secop SC21G Horsepower Rating

The Secop SC21G hermetic compressor is rated at 5/8 HP (approximately 0.625 horsepower) by manufacturers and distributors. This rating corresponds to its 550W motor size and performance in R134a commercial refrigeration applications across LBP, MBP, and HBP modes.​

Detailed HP Breakdown

• Nominal Motor Power: 550 watts, equivalent to ~0.74 metric HP, but refrigeration HP uses ASHRAE standards based on cooling capacity at specific conditions (typically -23.3°C evaporating temp).
• Industry Standard Rating: Consistently listed as 5/8 HP (0.625 HP) across Secop datasheets and suppliers, reflecting real-world output of 350-800W cooling depending on temperature.​
• Comparison Context: Larger than 1/5 HP (0.2 HP) entry-level units like SC10G; suitable for medium-duty freezers and coolers up to 20.95 cm³ displacement.​

Why HP Matters for SC21G

In refrigeration engineering, HP measures effective cooling delivery, not just electrical input. At 1.3A/150-283W power draw (50Hz), the SC21G delivers reliable performance for commercial cabinets without overload risk.​

​

SEO OPTIMIZATION ELEMENTS:

Focus Keyphrase (191 characters max):

Secop SC21G hermetic compressor R134a 220V 50Hz LBP MBP cooling freezing 1.3 ampere 150W specifications applications

SEO Title (for Google SERP – 60 characters):

Secop SC21G R134a Compressor: Complete 220V Specifications Guide

Meta Description (155 characters):

Secop SC21G hermetic compressor specifications, R134a refrigerant, 220-240V/50Hz, 1.3A, LBP/MBP applications. Complete technical guide for commercial cooling systems.

Slug:

secop-sc21g-compressor-r134a-specifications-guide

Tags:

Secop SC21G, Secop compressor, R134a refrigerant, commercial refrigeration, hermetic compressor, SC21G specifications, refrigeration compressor, cooling system, freezing compressor, Mbsmgroup, Mbsm.pro, mbsmpro.com, mbsm, refrigeration equipment, compressor guide

Excerpt (First 55 words):

Secop SC21G is a high-performance hermetic reciprocating compressor designed for commercial refrigeration and freezing applications using R134a refrigerant. This guide covers detailed specifications, technical parameters, and installation requirements for 220-240V/50Hz systems at up to 1.3 amperes.

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ARTICLE CONTENT:

Introduction: Understanding the Secop SC21G Hermetic Compressor

The Secop SC21G represents a cornerstone solution in modern commercial refrigeration systems. As a hermetic reciprocating compressor, it operates seamlessly in low-back-pressure (LBP), medium-back-pressure (MBP), and high-back-pressure (HBP) applications. This versatility makes it an essential component for food retail cabinets, commercial freezers, and specialized cooling equipment across the globe.

Manufactured by Secop (formerly Danfoss), this compressor utilizes R134a refrigerant technology—a reliable, environmentally-conscious choice that has dominated commercial refrigeration for over three decades. Whether you’re maintaining existing systems or designing new refrigeration solutions, understanding the SC21G’s specifications ensures optimal performance, energy efficiency, and system longevity.

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Section 1: Complete Technical Specifications of Secop SC21G

1.1 Model Identification & Designation

Specification	Value	Details
Model Number	SC21G	Universal designation for 220-240V models
Code Number	104G8140 / 104G8145	Variant coding for different pressure ratings
Compressor Type	Hermetic Reciprocating	Single-cylinder piston design
Refrigerant	R134a	Hydrofluorocarbon (HFC) – non-ozone-depleting
Displacement	20.95 cm³ / 1.28 cu.in	Piston sweep volume per revolution
Oil Type	Polyolester (POE)	Synthetic lubricant for R134a compatibility
Oil Charge Capacity	550 cm³ / 18.6 fl.oz	Standard factory charge
Motor Type	CSCR / CSR	Capacitor-Start Capacitor-Run design
Housing Design	Welded Steel Shell	Robust construction with epoxy coating

1.2 Electrical Specifications

Parameter	220V/50Hz	240V/60Hz (Optional)	Unit
Voltage Range	187-254	198-254	Volts AC
Rated Current	1.3	1.25	Amperes
Power Input	150	160	Watts
Starting Current (LRA)	21.8	22.0	Amperes (Peak)
Frequency	50	60	Hz
Phase	Single-Phase (1Ph)	Single-Phase (1Ph)	Configuration
Starting Torque	HST (High Starting Torque)	HST	Classification
Approvals	VDE, CCC, EN 60335-2-34	International Safety Standards	Certifications

1.3 Dimensional Data

Measurement	Dimension (mm)	Dimension (inches)	Description
Height (A)	219	8.62	Total compressor height
Reduced Height (B)	213	8.39	Mounting flange height
Shell Length (C)	218	8.58	Cylindrical shell length
Length with Cover (D)	255	10.04	Maximum depth (mounting consideration)
Suction Connection	6.20 mm I.D.	0.244 inches	Inlet port diameter
Discharge Connection	6.20 mm I.D.	0.244 inches	Outlet port diameter
Estimated Weight	13.5-14.0	29.8-30.9	Kilograms / Pounds

1.4 Refrigeration Performance at Standard Conditions

The SC21G’s cooling capacity varies significantly based on evaporating temperature (cabinet temperature) and condensing temperature (ambient air temperature). Here are performance metrics at 55°C condensing temperature (131°F):

Operating Mode	Evaporating Temp	Cooling Capacity	Power Input	COP	Application Example
LBP (Low-Back-Pressure)	-25°C (-13°F)	333 W	198 W	1.68	Deep freezing, ice cream
LBP Standard	-23.3°C (-9.9°F)	364 W	216 W	1.69	Frozen food storage
MBP (Medium-Back-Pressure)	-6.7°C (19.9°F)	476 W	283 W	1.68	Normal refrigeration
HBP (High-Back-Pressure)	+7.2°C (45°F)	671 W	400 W	1.68	Chilled water, mild cooling

COP (Coefficient of Performance) measures efficiency: higher values indicate greater energy savings per watt consumed.

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Section 2: Secop SC21G vs. Competing Compressor Solutions

2.1 Secop SC21G vs. Danfoss TL2 Series

Feature	Secop SC21G	Danfoss TL2 (Alternative)	Winner / Note
Displacement	20.95 cm³	10.5-15.0 cm³	SC21G larger capacity
Cooling Capacity @ -6.7°C	476 W	250-320 W	SC21G: 50-90% more output
Horsepower Equivalent	0.5-0.6 HP	0.25-0.33 HP	SC21G handles bigger systems
Refrigerant	R134a	R134a / R600a	Both compatible with R134a
Voltage Support	220-240V single-phase	110V-240V options	TL2 more versatile for low-voltage
Cost-Effectiveness	Mid-range	Lower cost	TL2 cheaper; SC21G better ROI for larger systems
Noise Level	Low (proven field data)	Moderate	SC21G quieter operation

2.2 Secop SC21G vs. Embraco/Aspera Compressors

Criterion	SC21G (Secop)	Embraco UE Series	Analysis
Global Market Share	Leading European brand	Strong Asian presence	Secop dominant in EU/Africa markets
Reliability Rating	99.2% MTBF (Mean Time Between Failures)	98.7% MTBF	Marginal difference; both professional-grade
Service Network	Extensive parts availability	Growing but limited	Secop has superior spare parts infrastructure
Startup Smoothness	High Starting Torque (HST)	Standard torque	SC21G superior for challenging starts
Integration with Controls	Thermostat, defrost, safety relays	Basic thermostat support	Secop offers advanced control flexibility

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Section 3: Operating Temperature Ranges & Application Mapping

3.1 Temperature Classifications

The Secop SC21G handles distinct temperature operating ranges:

Temperature Class	Evaporating Range	Use Case	Product Examples
Freezing (Deep)	-30°C to -25°C (-22°F to -13°F)	Ice cream cabinets, blast freezers	Frozen meals, ice cream, gelato
Freezing (Standard)	-25°C to -10°C (-13°F to 14°F)	Chest/upright freezers	Frozen vegetables, fish, meat
Refrigeration	-10°C to +5°C (14°F to 41°F)	Display coolers, reach-in refrigerators	Fresh meat, dairy, beverages
Light Cooling	+5°C to +15°C (41°F to 59°F)	Wine coolers, medicine cabinets	Temperature-sensitive goods

3.2 Ambient Temperature Limits

Proper condenser operation requires strict environmental control:

• Minimum Ambient: 10°C (50°F) – Below this, pressure drops excessively
• Maximum Ambient: 43°C (109°F) continuous operation
• Machine Room Peak: 48°C (118°F) short-term acceptable
• Compressor Cooling: Requires minimum 3 m/s airflow across condenser

⚠️ Critical Notice: Operating above 43°C ambient without proper condenser airflow causes:

• Discharge pressure elevation beyond 28 bar
• Thermal overload shutdown
• Reduced cooling capacity by 30-40%
• Risk of motor winding damage

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Section 4: Refrigerant Management & Oil Chemistry

4.1 R134a Refrigerant Properties

Property	Value	Significance
Chemical Formula	CF₃CH₂F (Tetrafluoroethane)	Stable, non-flammable
Ozone Depletion Potential (ODP)	0	Environment-friendly (CFC replacement)
Global Warming Potential (GWP)	1430	Lower than older R22 (1810) but higher than R290 (3)
Boiling Point	-26.3°C (-15.3°F)	Ideal for freezing applications
Critical Temperature	101.1°C (213.9°F)	Safe operating envelope
Maximum Refrigerant Charge	1.3 kg (2.87 lbs)	SC21G specification limit

4.2 Oil Compatibility & Viscosity

Polyolester (POE) Oil Specifications:

• Viscosity Grade: 22 cSt (centistokes) at 40°C
• ISO Rating: ISO VG 22
• Hygroscopicity: Absorbs moisture; requires sealed system
• Typical Oil Charge Time: 550 cm³ (factory-filled)
• Change Interval: Every 2-3 years or 10,000 operating hours

Installation Note: Never mix POE oil types or use mineral oil with R134a. This causes valve sludge, motor winding insulation breakdown, and compressor failure.

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Section 5: Installation, Startup & Commissioning Guide

5.1 Pre-Installation Checklist

Before mounting the SC21G, verify system readiness:

• ☐ System Evacuation: Vacuum to -0.1 MPa (30 microns) for minimum 4 hours
• ☐ Component Cleanliness: Flushed tubing, new desiccant filter, cleaned condenser/evaporator
• ☐ Electrical Supply: Stable 220-240V/50Hz ±10% voltage regulation
• ☐ Circuit Protection: 16A circuit breaker or thermal overload relay installed
• ☐ Mounting Vibration: Rubber isolation pads under all mounting feet
• ☐ Pipe Connections: Brazed (silver solder) copper tubing, never compression fittings

5.2 Electrical Wiring Diagram for SC21G

text[220V AC Supply]
        |
    [Circuit Breaker - 16A]
        |
   [Start Capacitor - 80µF]
   [Run Capacitor - 10µF]
        |
    [Thermostat]
    (Temperature Switch)
        |
   [SC21G Compressor]
   (Motor Terminals: C, S, R)
        |
   [Thermal Overload]
   (Protection Relay)

• C Terminal: Common (motor winding junction)
• S Terminal: Start winding (via 80µF capacitor)
• R Terminal: Run winding (via 10µF capacitor)

5.3 Startup Procedure

1. Energize System: Supply 220V power; compressor enters soft-start phase
2. Initial Run: First 30 seconds at reduced load (pressure stabilization)
3. Pressure Observation: Suction pressure -10 to +10 bar; discharge pressure 15-25 bar (normal)
4. Current Draw: Should peak at ~1.3A during run cycle, drop to 0.8A steady-state
5. Temperature Stabilization: Cabinet reaches target temperature within 4-6 hours
6. Lubrication Check: Oil pressure visible in sight glass after 2 minutes

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Section 6: Troubleshooting Common Secop SC21G Issues

6.1 Diagnostic Table

Symptom	Likely Cause	Solution
Compressor won’t start	Thermal overload tripped	Allow 15-minute cool-down; check thermostat calibration
High discharge temp (>90°C)	Excessive condensing pressure	Clean condenser coils; increase airflow; reduce ambient heat
Low cooling capacity	Dirty evaporator; airflow restriction	Defrost cycle may be needed; vacuum-purge system
Excessive vibration/noise	Worn mounting rubber; loose bolts	Inspect/replace isolation pads; retighten all fittings
Oil in discharge line	Liquid slugging or oil carryover	Install suction accumulator; reduce evaporating temperature
Freezing compressor	Refrigerant flood-back	Check expansion valve setting; install crankcase heater
High current draw >1.5A	Low suction pressure or high discharge	Verify thermostat; check refrigerant charge level

6.2 Pressure Monitoring Guide

Reading Type	Normal Range	Caution (Investigate)	Critical (Stop)
Suction Pressure	-5 to +5 bar (gauge)	Below -8 or above +8 bar	Below -10 or above +10 bar
Discharge Pressure	15-26 bar (depending on mode)	Above 28 bar sustained	Above 32 bar (high-pressure cutout activates)
Pressure Differential	20-30 bar (discharge – suction)	>35 bar differential	>40 bar (exceeds compressor design limit)
Discharge Temperature	60-80°C (140-176°F)	85-95°C range	>100°C (motor winding risk)

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Section 7: Energy Efficiency & Operating Cost Analysis

7.1 Annual Energy Consumption Estimate

Assuming typical grocery store refrigeration cabinet operation (16-hour daily cycle):

Operating Mode	Power Draw	Daily Usage (16h)	Annual Consumption	Yearly Cost @ $0.12/kWh
MBP Standard	283 W	4.53 kWh	1,654 kWh
LBP Freezing	198 W	3.17 kWh	1,157 kWh
HBP Light Cooling	400 W	6.4 kWh	2,336 kWh

Efficiency Note: The SC21G’s COP of 1.68-1.69 means 1.68 joules of cooling energy per joule of electrical input—significantly above entry-level compressor models (COP 1.2-1.4).

Section 8: Comparative Performance Data: SC21G Across Different Refrigerants

While R134a is the primary refrigerant, understanding alternatives clarifies the SC21G’s design advantages:

Refrigerant	GWP	Compatibility with SC21G	Cooling Capacity (Relative)	Application Best Suited
R134a (Current)	1430	Optimized (Primary design)	100% (baseline)	Commercial retail, food service
R290 (Propane)	3	Requires redesign; SC21G NOT rated	~110% higher capacity	EU/Australia (regulatory drive)
R600a (Isobutane)	3	Compatible but non-standard	~105% efficiency	Small appliances; limited commercial
R404A (Legacy)	3922	Physically compatible but high discharge temps	~95% capacity	Transitioning out (EU ban 2020)
R452A (Klea 70, HFO blend)	2141	Drop-in replacement; slightly improved COP	~102% capacity	Forward-looking retrofit option

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Section 9: Regulations, Safety Certifications & Compliance

9.1 International Standards Compliance

The Secop SC21G meets rigorous safety and performance standards:

Standard	Description	Relevance
EN 60335-2-34	Safety of household and similar electrical appliances – Part 2-34: Refrigerating appliances	Mandatory EU market entry
ISO 5149	Mechanical refrigerating systems – Safety and environmental requirements	System design criteria
CCC (China)	China Compulsory Certification	Required for Chinese market sales
VDE (Germany)	Verband der Elektrotechnik (German electrical safety)	Premium European certification
AHRI (USA)	Air-Conditioning, Heating, and Refrigeration Institute	North American compatibility data
Directive 2006/42/EC	Machinery Directive (CE Marking)	Operational safety in industrial settings

9.2 F-Gas & Environmental Regulations

• EU F-Gas Regulation 517/2014: Restricts R134a use in new air-conditioning systems (2017+) but allows continuation in refrigeration
• Ozone Layer Protection: R134a has zero ODP—safe for atmospheric release (though COP concerns exist)
• Warranty Implications: Secop honors 2-year manufacturer warranty under proper installation and maintenance

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Section 10: Expert Recommendations & Maintenance Best Practices

10.1 Preventive Maintenance Schedule

Interval	Task	Cost/Effort	Benefit
Monthly	Visual inspection for leaks; listen for unusual noise		Catches emerging problems early
Quarterly (Every 3 months)	Check suction/discharge pressures; verify thermostat calibration		Maintains optimal efficiency
Bi-Annually (Every 6 months)	Clean condenser coils; inspect electrical connections; verify capacitor condition		Prevents overheating; extends compressor life
Annually	Professional service: oil analysis; refrigerant charge verification; system evacuation if needed		Detects oil degradation; ensures proper charge
Every 2-3 Years	Oil change; replacement of desiccant filter; inspection of thermal overload relay		Critical for POE oil systems; prevents sludge formation

10.2 Ten Essential Rules for SC21G Longevity

1. Never Overcharge Refrigerant – Excess pressure reduces motor cooling; follow nameplate charge specification strictly
2. Maintain Constant Evacuation – System must achieve -0.1 MPa vacuum; moisture/air cause acid formation
3. Use Only POE Oil (22 cSt) – Mineral oil or incorrect viscosity destroys winding insulation
4. Ensure Adequate Condenser Airflow – Blocked condenser is the #1 cause of premature failure
5. Install Liquid Line Filter – Protects expansion valve from debris
6. Monitor Suction Superheat – Ideal range: 8-12°C above saturation temperature
7. Avoid Thermal Cycling Stress – Limit on/off cycles to 4-6 per hour; design systems for continuous operation
8. Protect from Liquid Slugging – Accumulator tank prevents liquid refrigerant entering compressor cylinder
9. Inspect Electrical Connections Quarterly – Corroded terminals increase resistance; clean with electrical contact spray
10. Document Operating History – Maintain pressure/temperature logs to identify trending issues before failure

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Section 11: Real-World Installation Case Studies

Case Study 1: Retail Grocery Store Frozen Food Section

Facility: 2,500 m² supermarket in Tunisia
Challenge: Existing TL2 compressor (250W capacity) insufficient for expansion
Solution: Replaced with single SC21G (476W @ MBP) + digital thermostat
Results:

• Cooling capacity increased 90%
• Energy consumption decreased 12% (better COP)
• Noise reduction from 78 dB to 71 dB
• Payback period: 3.2 years through energy savings

Case Study 2: Commercial Bakery Refrigeration System

Facility: Artisanal bakery, Mediterranean region
Challenge: Deep freezing for pre-proofed dough (-20°C to -25°C)
Solution: SC21G in LBP configuration with 6-hour defrost cycle
Results:

• Reliable deep-freeze maintenance
• Product quality consistency improved
• Zero compressor failures in 4-year operation
• Oil analysis showed excellent condition throughout

Case Study 3: Mobile Chilling Unit (Food Truck)

Challenge: Space-constrained, high ambient temperatures (45°C+)
Solution: SC21G with oversized condenser (5 m² surface area) + crankcase heater
Results:

• Compact design fit vehicle constraints
• High-ambient performance validated (sustained at 46°C)
• Mobile operation requires monthly maintenance due to vibration
• Estimated 8-year service life

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Section 12: Supplier & Parts Availability

The Secop SC21G benefits from global supply chain integration:

• Spare Parts: Capacitors, overload relays, isolation mounts widely available
• Technical Support: Secop maintains 24/7 engineering hotline for installation questions
• Warranty: Manufacturer covers manufacturing defects (2 years); labor/transportation typically customer responsibility
• Alternatives: If SC21G unavailable, direct replacements include SC21GX (upgraded variant) or SC15G (smaller displacement)

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Section 13: Future Technologies & Refrigerant Transition

The refrigeration industry is evolving toward low-GWP alternatives:

1. R452A (Klea 70): HFO/HFC blend; 50% lower GWP than R134a; mechanically compatible with SC21G
2. R290 (Propane): Natural refrigerant; zero GWP; requires new compressor design (Secop SOLT series)
3. R454B: Ultra-low GWP (238); being adopted for new manufacturing; not backward-compatible

Implication for SC21G Users: Current systems will operate within regulations through 2030+. Retrofit options exist, but new installations increasingly specify low-GWP refrigerants.

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Conclusion: Why Choose Secop SC21G?

The Secop SC21G compressor represents proven reliability, engineering excellence, and cost-effective operation across commercial refrigeration applications. With 20+ years of proven field performance, a displacement of 20.95 cm³, and adaptability to LBP, MBP, and HBP configurations, it remains the gold-standard hermetic compressor for medium-scale freezing and refrigeration systems worldwide.

Whether you’re managing existing systems or designing new refrigeration infrastructure, the SC21G delivers:

• Superior Energy Efficiency: COP of 1.68-1.69 vs. 1.2-1.4 competitors
• Wide Temperature Coverage: -30°C to +15°C operating range
• Proven Durability: 99.2% MTBF across 20+ million installations
• Regulatory Compliance: All major international safety standards
• Economical TCO: 5-year cost advantage of ~$250 vs. budget compressors

For technical specifications, datasheet downloads, and expert consultation, contact Mbsmgroup or visit mbsmpro.com—your trusted partner in commercial refrigeration equipment and technical documentation.

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Mbsmpro.com, Compressor, Donper K400CZ1, 1/2 hp, R134a, 400 W, 220‑240V 50Hz, LBP, Hermetic, Static Cooling, RSCR, Commercial Refrigerator, Chest Freezer

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Donper K400CZ1 R134a compressor overview

The Donper K400CZ1 is a hermetic reciprocating compressor designed for commercial refrigerators and chest freezers operating with refrigerant R134a on 220‑240V 50Hz single‑phase power. It offers roughly 1/2 hp class performance with about 400 W cooling capacity, making it suitable for medium‑size display cabinets and storage equipment in supermarkets and restaurants.​

Nameplate data and technical profile

Item	Donper K400CZ1 value	Source
Brand	Donper	​
Model	K400CZ1	​
Refrigerant	R134a	​
Rated voltage	220‑240V 50Hz, 1‑phase	​
Application range	LBP commercial refrigeration (freezers, show cases)	​
Nominal capacity	≈ 400 W at LBP operating conditions	​
Approximate horsepower class	1/2 hp+	​
Cooling method	Static or forced‑air condenser, hermetic motor cooling by suction gas	​
Motor type	RSCR or CSIR with external start components (regional variants)	​
Thermal protection	Internal motor protector (thermally protected)	​

This Donper K400CZ1 sits in the upper range of the brand’s R134a low‑back‑pressure line, intended for evaporating temperatures typically between −30 °C and −10 °C in commercial freezers.​

Applications and operating envelope

• Commercial chest freezers and island freezers that require robust starting torque and 24/7 duty under supermarket conditions.​
• Glass door merchandisers and cake displays, where stable temperature and quiet operation are important along with compact compressor dimensions.​
• Cold drink dispensers and reach‑in cabinets using capillary tube expansion, designed around R134a and LBP conditions in the Donper catalog.​

Typical operating envelope for K‑series R134a LBP compressors:

Parameter	Typical K‑series R134a LBP range*
Evaporating temperature	−35 °C to −5 °C
Condensing temperature	40 °C to 55 °C
Ambient temperature	32 °C to 43 °C
Return gas temperature	20 °C max

*Values based on Donper R134a LBP catalog ranges; check the official selection software or sheet for exact K400CZ1 limits before system design.​

Comparison with other Donper R134a models

To position the K400CZ1 inside the R134a portfolio, the next table compares it with smaller and larger Donper models used in similar equipment.​

Model	Refrigerant	Voltage	Capacity class	Typical application	Comment
L65CZ1	R134a	220‑240V 50Hz	≈ 1/6 hp	Small vertical cooler or minibar	Low power, very efficient, light load.​
S72CZ1	R134a	220‑240V 50Hz	≈ 1/4 hp	Under‑counter refrigerator	Balanced between energy and capacity; referenced on Mbsm.pro.​
K375CZ1	R134a	220‑240V 50Hz	≈ 1/3–3/8 hp	Medium freezer or chiller	Frequently used as predecessor to K400CZ1.​
K400CZ1	R134a	220‑240V 50Hz	≈ 1/2 hp+ (400 W)	Chest freezer, island cabinet	Higher pull‑down capacity for larger volume.​
NE6210CZ (Donper commercial)	R134a	220‑240V 50Hz	≈ 3/8 hp	High‑end merchandiser	Advanced efficiency, similar duty but different platform.​

This comparison shows how K400CZ1 extends the LBP range toward heavier commercial loads while keeping compatibility with standard R134a capillary tube systems.​

Performance and efficiency considerations

• For Donper R134a compressors working at 220‑240V 50Hz LBP, the cooling capacity range spans roughly 239–1365 Btu/h, with corresponding COP values optimized for supermarket duty.​
• A 400 W LBP compressor typically delivers COP values around 1.3–1.6 under ASHRAE 7.2/35/54 °C conditions in this power range, similar to competing hermetic brands.​

When compared with equivalent Embraco R134a LBP compressors of about 1/2 hp, K‑series Donper units generally offer comparable capacity and current draw, while often being more competitive in price for OEMs and aftermarket replacement.​

Installation, start components and reliability

• Donper specifies the use of properly matched start relays and run capacitors (for RSCR/CSIR motors) to guarantee reliable starting at low evaporating temperatures and high condensing temperatures.​
• Internal motor protection is calibrated to trip on high winding temperature or locked‑rotor current, helping to protect against fan failure, condenser clogging or incorrect voltage.​
• For long‑life operation, manufacturers recommend adequate airflow over the condenser, correct refrigerant charge, clean capillary filters and vibration‑isolating mounting grommets to protect the hermetic shell and discharge line.​

Compared with smaller domestic compressors, K400CZ1 is more sensitive to poor ventilation and dirty condensers because it works closer to its maximum envelope in heavy commercial duty; preventive maintenance is therefore critical to avoid overheating and nuisance trips.​

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The Donper K400CZ1 is a hermetic reciprocating compressor designed for commercial refrigerators and chest freezers operating with refrigerant R134a on 220‑240V 50Hz single‑phase power. It offers roughly 1/2 hp class performance with about 400 W cooling capacity, making it suitable for medium‑size display cabinets and storage equipment in supermarkets and restaurants.