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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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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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.