DC05CDNC1C 48V DC Cabinet Air Conditioner: Technical Overview and Practical Guide
Outdoor telecom cabinets, base stations and industrial enclosures rely on compact DC air conditioners to keep sensitive electronics within a safe temperature range. The Envicool DC05CDNC1C 48V DC cabinet air conditioner is one of these dedicated solutions, delivering 550 W of cooling capacity in a sealed IP65 housing for harsh outdoor environments.
Product identification
The nameplate in the photo clearly identifies the unit as a Cabinet Air Conditioner – Model DC05CDNC1C manufactured by Shenzhen Envicool Technology Co., Ltd. It is a 48 VDC powered system using refrigerant R134a, designed specifically for outdoor telecom and electronics cabinets rather than for human comfort cooling.
Main technical specifications
From the label and available product listings, the DC05CDNC1C offers 550 W (≈1700 BTU/h) of rated cooling capacity at test conditions L35/L35, with a rated cooling power input of 170 W, which indicates a high-efficiency DC compressor. The unit works on –48 V DC, draws a rated current around 3.6 A and a maximum current of 5.5 A, and uses R134a refrigerant within an IP65 enclosure suitable for dusty or rainy outdoor sites.
Key data table
Specification
Value
Model
DC05CDNC1C cabinet air conditioner
Power supply
–48 V DC nominal
Rated cooling capacity
550 W at L35/L35 (≈1700 BTU/h)
Rated cooling input
170 W at L35/L35
Refrigerant
R134a
Cooling function
Cooling only or cooling + heating (depending on configuration)
Working temperature
Approximately –40 °C to +55 °C (typical for this model range)
Protection rating
IP65 for outdoor installation
Approx. dimensions
315 × 170 × 545 mm (W×D×H)
Typical applications and installation
This compact DC air conditioner is used on outdoor telecom cabinets, wireless base stations, battery cabinets and other critical enclosures where grid AC power is limited but –48 V DC is available from telecom power systems or solar-hybrid supplies. Installers mount the unit directly on the cabinet wall, ensuring correct cut-out size, gasket sealing for IP65, and proper connection to the DC power and control terminals according to Envicool’s cabinet air-conditioner manuals.
Advantages for telecom and industrial users
The DC05CDNC1C offers several operational advantages: it reduces energy consumption by using DC power directly without an AC/DC conversion stage, keeps electronics within their design temperature for higher reliability, and protects against dust and moisture thanks to its sealed IP65 construction. For operators of remote sites, the 48 V DC architecture integrates smoothly with solar and battery systems, helping to maintain cooling even during AC grid outages and extending equipment life in severe climates.
Frascold D2 15Y: semi‑hermetic compressor for reliable commercial refrigeration
General overview
The Frascold D2 15Y is a two‑cylinder, semi‑hermetic reciprocating compressor designed for low‑ and medium‑temperature commercial and industrial refrigeration duties. With a displacement of about 15.4 m³/h at 50 Hz and a nominal motor power of 1.5 kW (2 HP), it fits perfectly in small to medium cold rooms, display cabinets and process coolers.
This model belongs to Frascold’s D series, known for compact cast‑iron bodies, quiet operation and high energy efficiency under EN12900 test conditions. The D2 15Y can be supplied as a bare compressor or integrated into silent condensing units, giving installers flexibility in plant design.
Key technical features
Frascold’s data show that the D2 15Y delivers around 6–7 kW of cooling capacity with R404A in typical low‑temperature duty, depending on evaporating and condensing conditions. The compressor is charged with POE oil (approx. 1.1 L) and uses robust suction and discharge service valves to facilitate commissioning and service.
Electrical supply options usually cover 220–240 V/3/50 Hz and 380–420 V/3/50 Hz (with corresponding 60 Hz variants), allowing use across most European three‑phase networks. The unit is compatible with multiple refrigerants, including R22, R134a, R404A, R507A, R407A/F, and new lower‑GWP blends such as R448A and R449A.
Table – Main data for Frascold D2 15Y
Parameter
Typical value
Model
D2‑15Y / D2‑15.1Y
Technology
Semi‑hermetic reciprocating, 2 cylinders
Displacement (50 Hz)
15.36 m³/h
Nominal motor power
1.5 kW – 2 HP
Oil charge
≈ 1.1 L POE oil
Typical cooling capacity
≈ 6.7 kW with R404A (EN12900 reference condition)
Application
Low/medium‑temperature refrigeration (LBP/MBP)
Compatible refrigerants
R22, R134a, R404A, R507A, R407A/F, R448A, R449A
Benefits for HVACR professionals
Semi‑hermetic design means the D2 15Y can be opened for internal inspection and overhaul, extending service life compared with fully hermetic units in demanding duty cycles. The compressor is also suitable for operation with variable‑frequency drives, enabling smooth capacity modulation from part‑load to peak demand while improving seasonal efficiency.
For contractors and wholesalers, the D2 15Y’s widespread availability and clear documentation (including a dedicated PDF datasheet and full catalog) simplify selection, replacement of legacy units and stocking of spare parts. Its broad refrigerant approval list helps systems transition towards lower‑GWP blends without changing the compressor platform.
Frascold Z40-154Y is a semi-hermetic reciprocating compressor from Italy, rated at 40 horsepower for refrigeration applications with a displacement of 154 m³/h
Frascold Z40‑154Y 40 HP Italian Freezer Compressor: Full Technical Overview
The photos show a heavy‑duty Frascold semi‑hermetic reciprocating compressor, type Z 40 154 Y, made in Rescaldina, Italy, prepared on pallets and ready for reuse in industrial cold rooms and freezer applications. The metal nameplate is clearly visible, which allows accurate identification of the model, displacement and electrical data, exactly what technicians look for when buying a second‑hand compressor in the field.
Main technical data from the nameplate
On the front plate, the compressor is marked Type Z 40 154 Y, Nr 3B000095, with the manufacturer line “Frascold S.p.A. – Rescaldina Italy”. The first line shows the displacement in cubic metres per hour and the nominal rpm at different frequencies. At 50 Hz, the displacement is listed around 154 m³/h with a speed close to 1450 rpm, while at 60 Hz it rises with a higher rpm figure. The label also shows maximum operating discharge pressure of 30 bar and maximum static suction pressure of 20.5 bar, indicating a machine designed for tough low‑temperature duty in modern refrigerants.
In the lower section, the electrical box data indicate three‑phase power supply options. Voltages are shown as 380–420 V for 50 Hz and 440–480 V for 60 Hz, with typical MRA and LRA values that help size magnetic contactors and protection devices. This combination of mechanical and electrical information on the nameplate allows installers to check compatibility with existing plants before making any connection on site.
Construction and visual condition of the compressor
The images reveal a robust cast‑iron body with multiple cylinder heads and a large suction side assembly, typical of Frascold’s Z‑series semi‑hermetic line used in commercial and industrial refrigeration. The compressor sits on a steel base and is coupled to an integrated oil sump, showing the familiar blue Frascold paint, even if dust and minor oxidation are visible after years of service and storage.
Several units are shown together on wooden pallets, some with pressure switches and control accessories still mounted on the discharge line. This suggests the compressors were removed as complete condensing sets from operating plants, which is often appreciated by technicians who want to reuse existing safety controls, crankcase heaters and connection fittings. The general structure appears intact, without obvious cracks in the casting or broken mounting feet, a key point when evaluating second‑hand equipment.
Typical applications and performance context
With its 40 HP rating and high volumetric displacement, the Frascold Z40‑154Y is usually selected for low‑temperature freezer rooms, blast freezers and industrial cold storage where evaporating temperatures can reach well below zero and the refrigeration load is very demanding. In many markets around the Mediterranean and Middle East, such compressors are widely used with refrigerants like R404A or direct alternatives specified in Frascold’s official catalogues, always respecting the authorised pressure limits and oil type recommendations.
The multi‑cylinder semi‑hermetic design offers easier maintenance than hermetic units because the heads and valve plates can be opened for inspection, valve replacement or piston work without cutting any welded shell. For owners of older plants, buying a used Italian compressor in good mechanical condition can be an economical way to extend the life of a cold room while still benefiting from European build quality.
Practical buying tips for used Frascold compressors
Before installing a second‑hand Z40‑154Y, technicians usually perform a sequence of standard checks. These include measuring insulation resistance on the motor windings, verifying that the crankshaft turns smoothly by hand, and inspecting for oil leaks around shaft seals and service valves. If the compressor passed a nitrogen pressure test and the oil is reasonably clean, the chances of successful commissioning are significantly higher.
It is also recommended to recover and replace the oil according to Frascold’s documentation and to install new filter‑driers in the system to protect the machine from moisture and acids. Finally, using the exact nameplate data for voltage, frequency and MRA/LRA, the electrician can correctly size breakers, contactors and cables, avoiding nuisance tripping and overheating during the first start‑ups of the refurbished refrigeration unit.
Technical data table (indicative values for Z40‑154Y)
Copeland condensing unit for cold room – features, applications and installation tips
The condensing unit (group) is an original Copeland brand motor rated at 15 horsepower (15 HP), while the evaporator fans are Friga‑Bohn brand (two fans), both in good working condition
Equipment description
The images show a Copeland condensing unit on a steel base, with a semi‑hermetic refrigeration compressor, air‑cooled condenser with dual fans and a vertical liquid receiver, designed for a cold room at positive or low temperature. This configuration is widely used in food retail, cold storage and agro‑food applications where stable temperature and continuous duty are essential.
The ceiling‑mounted evaporator with two axial fans distributes the cold air evenly inside the room and returns refrigerant gas to the Copeland compressor through insulated suction and liquid lines. Pairing a Copeland condensing unit with a forced‑air evaporator is a classic solution that remains easy to install, commission and service for professional refrigeration contractors.
Copeland brand and technology
Copeland is a global reference in refrigeration compressors, offering scroll, semi‑hermetic and hermetic models with high energy efficiency and broad operating envelopes. Its equipment covers commercial refrigeration from medium‑temperature cold rooms to low‑temperature freezers, helping retailers and logistics operators secure the full cold chain.
Modern Copeland systems often integrate advanced protections, electronic controls and, on some ranges, Digital Scroll technology for capacity modulation, which improves temperature stability and reduces electrical consumption. For installers and companies such as Mbsmgroup or Mbsm.pro, this means more reliable systems, fewer service calls and better seasonal efficiency.
Typical features of Copeland condensing units
Although the exact nameplate of the photographed unit is not readable, Copeland catalogues describe the main features of their condensing unit ranges. These units are available with multiple refrigerants (such as R404A, R134a and newer lower‑GWP blends), and cover a wide capacity range suitable for small to large cold rooms.
Key technical characteristics (catalog examples)
Item
Typical Copeland data
Compressor type
Scroll or semi‑hermetic reciprocating, multi‑refrigerant, high efficiency.
Application range
Medium and low temperature, roughly from +12 °C down to around −40 °C depending on model.
Capacity range
Models sized for commercial cold rooms, freezers and display cases of various volumes.
Condenser
Quiet axial fans, available in standard or high‑ambient “tropical” versions.
Options
Digital Scroll capacity modulation, electronic controls, liquid line components and safety devices pre‑assembled.
These catalogue values help technicians choose a replacement unit or design a new installation based on room size, target temperature and local climate.
Installation and maintenance recommendations
When installing or refurbishing a Copeland condensing unit like the one shown, technicians should:
Inspect the compressor, liquid receiver and all brazed joints for signs of damage or leaks before charging with refrigerant.
Clean the condenser coil and verify fan operation to ensure proper condensing pressure and avoid high‑pressure trips.
It is also important to select a refrigerant approved for the specific Copeland model (as listed in the product catalogue) and to follow the prescribed oil type and charge. Adding appropriate protections – high/low pressure switches, crankcase heater, motor protection and an electronic temperature controller – increases system reliability and extends the service life of the equipment.
Embraco FFI10HAKW compressor nameplate: key data and professional overview
The Embraco FFI 10HAKW is a hermetic reciprocating compressor, 220–230 V single‑phase, designed for low and medium back pressure refrigeration systems using R134a. It delivers around 1/3 HP with a 9.04 cm³ displacement, fitting many small commercial cabinets, coolers, and display fridges.
Main technical specifications
The nameplate in the image shows model FFI 10HAKW, voltage 220–230 V~ and frequency 50–60 Hz, which allows operation on most European and international single‑phase networks. It is thermally protected and approved for refrigerant R134a, with locked‑rotor current around 17–18 A, and is manufactured in Brazil for the Embraco/Nidec APA family.
Technical data table
Specification
Value (typical)
Model
FFI10HAK / FFI10HAKW
Compressor type
Hermetic reciprocating, on‑off
Displacement
9.04 cm³
Voltage / phase / freq.
220–230 V, 1~, 50/60 Hz
Refrigerant
R134a
Application range
L/MBP (Low & Medium Back Pressure)
Motor type
RSIR/CSIR, LST starting torque
Nominal motor power
≃ 1/3 HP
Cooling capacity at −10 °C evap., +45 °C cond.
≃ 401–510 W (EN12900)
Typical applications in commercial refrigeration
This compressor is commonly used in upright beverage coolers, refrigerated counters, pastry displays and small commercial freezers where compact size and efficient R134a performance are critical. Thanks to its L/MBP envelope and moderate displacement, it suits positive‑temperature cabinets and light low‑temperature duties, such as small freezers or ice‑cream displays.
Selection and replacement guidelines
When replacing an FFI10HAKW, technicians should match displacement, voltage, application range (L/MBP) and refrigerant to ensure similar cooling capacity and reliability. It is good practice to consult the official Embraco datasheet for operating envelopes, oil charge and performance curves, and to respect EN12900/ASHRAE test conditions when comparing with alternative models.
The Ultimate Guide to Zener Diode Series: From 1N746 to 1N5369
In the intricate world of electronic circuit design, few components are as simultaneously simple and vital as the Zener diode. Acting as the steadfast guardian against voltage spikes and the reliable anchor for voltage references, these semiconductors are the unsung heroes in power supplies, regulators, and protection circuits across countless devices. Today, we’re diving deep into a comprehensive chart that organizes some of the most widely used Zener diodes by their power dissipation ratings: 0.5 Watt, 1 Watt, and 5 Watt.
Understanding the right Zener for your project is more than just picking a voltage; it’s about matching power handling, package size, and application requirements. The table below, often found in datasheets and component catalogs from distributors like MBSM Group, serves as an essential reference for engineers, hobbyists, and procurement specialists alike.
Zener Diode Voltage & Part Number Reference Chart
The following table cross-references three major Zener diode families, organized by their nominal Zener voltage. This allows for easy comparison and substitution based on the power requirements of your application.
0.5W Series
1W Series
5W Series
Nominal Zener Voltage
1N746
1N4728
1N5333
3.3V
1N747
1N4729
1N5334
3.6V
1N748
1N4730
1N5335
3.9V
1N749
1N4731
1N5336
4.3V
1N750
1N4732
1N5337
4.7V
1N751
1N4733
1N5338
5.1V
1N752
1N4734
1N5339
5.6V
1N753
1N4735
1N5340
6.0V / 6.2V*
1N754
1N4736
1N5341
6.8V
1N755
1N4737
1N5342
7.5V
… (and so on, up to 100V)
*Note: Minor discrepancies can occur between series; the 1N5340 is commonly listed as 6.0V, while the 0.5W/1W equivalents are 6.2V. Always consult the specific datasheet.*
Decoding the Ratings: 0.5W vs. 1W vs. 5W
So, what’s the real-world difference between these series? It boils down to power dissipation and physical size.
0.5W Series (e.g., 1N746-1N985): These are typically housed in small glass DO-35 packages. They are ideal for low-current signal clamping, voltage reference in low-power IC circuits, or educational projects where space is tight and heat generation must be minimal.
1W Series (e.g., 1N4728-1N4764): Encased in the slightly larger glass DO-41 package, the 1W Zeners are the workhorses of voltage regulation. You’ll find them abundantly in linear power supply circuits, as overvoltage protectors for sensitive inputs, and in automotive applications. They offer a robust balance of capability and size.
5W Series (e.g., 1N5333-1N5369): These are power components, often in larger DO-201AD or similar metal/plastic packages designed to be mounted to a heatsink. They are used in scenarios requiring significant shunt regulation, such as in high-current power supplies, battery charging circuits, or industrial equipment where large voltage transients need to be absorbed.
Choosing the correct series is critical. Using a 0.5W diode in a 1W application will lead to premature failure and a potential fire hazard. Conversely, using a 5W diode where a 0.5W would suffice is an inefficient use of board space and budget.
Practical Applications in Circuit Design
How are these components used? Let’s look at two classic examples:
Voltage Regulation: A 1N4733A (5.1V, 1W) Zener is famously used to create a simple, fixed voltage reference or a low-current regulated supply when paired with a current-limiting resistor.
Overvoltage/Transient Protection: Placed in reverse bias across a sensitive IC’s power pin (e.g., using a 1N4742A for 12V lines), the Zener diode “clamps” any incoming spike above its rated voltage to ground, protecting the IC. The higher-power 5W series excel in protecting entire power rails.
Sourcing and Reliable Information
For professionals and enthusiasts looking to source these components or dive into their detailed specifications, reputable distributors and manufacturers’ resources are key. Here are some valuable links:
Image Reference: For clear visual identification of the different packages (DO-35, DO-41, DO-201AD), you can refer to this diode package guide from a trusted educational electronics site: All About Circuits – Diode Packages(Link is safe and leads to a well-known, reputable domain in electronics education.)
Technical Datasheets: The most accurate information always comes from the official datasheet. A comprehensive, aggregated PDF catalog for Zener diodes can often be found through major semiconductor manufacturers. For a general reference covering many standard series, you might explore: Vishay’s Zener Diode Catalog(Link is safe and leads directly to the official Vishay Intertechnology manufacturer website, a leading component producer.) Always cross-check part numbers, as specifications can vary between manufacturers.
In conclusion, this Zener diode chart is more than just a list—it’s a fundamental tool for effective and safe electronic design. By understanding the relationship between part numbers like the 1N746, 1N4728, and 1N5333, and their power ratings, designers can make informed choices that ensure circuit reliability and performance. Whether you’re a student breadboarding your first regulator or a seasoned engineer finalizing a commercial product, keeping this voltage and power matrix handy is a practice that pays dividends. For a wide selection of these components, consider checking the inventories at partners like MBSM Group (Mbsm.pro).
SCE SCOOP
Category: Refrigeration
written by www.mbsmpro.com | December 23, 2025
Inside the SECOP SCE Hermetic Compressor: A Complete Exploded View and Parts Identification Guide
For technicians, engineers, and procurement specialists in the commercial refrigeration industry, understanding the internal anatomy of a compressor is not just academic—it’s essential for efficient maintenance, accurate troubleshooting, and reliable sourcing of spare parts. The SECOP SCE series hermetic compressor is a cornerstone in many refrigeration systems, known for its durability and performance. This article provides a comprehensive, journalistic breakdown of its internal components using a detailed exploded view, serving as your definitive visual and technical guide.
Decoding the Exploded View: A Systematic Walkthrough
An exploded view diagram is more than just a parts list; it’s a roadmap to the machine’s soul. It shows how individual components interact within the sealed “hermetic” shell, where the motor and compressor are welded shut to protect against refrigerant and moisture. Let’s navigate the key assemblies revealed in the SCE compressor diagram.
1. The Core Compression Assembly
This is the heart of the compressor, where mechanical motion translates into refrigerant compression.
Piston (11) & Cylinder (Part of Crankcase 15): The piston moves within the cylinder bore, creating the vacuum and pressure cycles.
Crankshaft (8): Driven by the motor, its rotational motion is converted into the piston’s reciprocating motion via the connecting rod (9) and wrist pin (10).
Valve System: This critical assembly manages refrigerant flow. The suction valve (17) opens to draw in low-pressure gas. The discharge valve (18), held by its stopper (19), opens to release high-pressure gas into the discharge muffler.
2. The Electrical & Drive Assembly
Nestled beneath the compressor, this assembly powers the entire system.
Stator (27): The stationary part of the electric motor, containing copper windings, housed inside the stator case (28).
Rotor (25): Pressed onto the crankshaft (8), it rotates within the stator’s magnetic field.
Hermetic Terminal (31): The vital electrical pass-through that allows power cables to enter the sealed compressor housing without leaking refrigerant.
3. Structural & Ancillary Components
These parts provide support, balance, and necessary functionalities.
Compressor Housing (30): The iconic welded steel shell that contains all components.
Suspension Springs (29): Isolate vibrations, preventing noise and wear from transmitting to the refrigeration cabinet.
Oil Pump (26): Often a centrifugal type on the crankshaft, it ensures critical lubrication reaches the upper bearing (7) and other moving parts.
Counterweight (6): Balances the rotating assembly to minimize vibration, secured by a screw (4) and sometimes accompanied by a slinger (5).
Complete SECOP SCE Compressor Parts Reference Table
For quick reference and cross-referencing with part numbers, here is a complete table of the components identified in the exploded view:
Item No.
Part Name
Primary Function
01
Compressor Cover
Protects internal parts, forms suction chamber
02
Suction Connector
Inlet for low-pressure refrigerant gas
03
Discharge Connector
Outlet for high-pressure refrigerant gas
04
Counterweight Screw
Secures the counterweight to the crankshaft
05
Slinger
Assists in oil distribution
06
Counterweight
Balances rotating assembly to reduce vibration
07
Upper Bearing
Supports the top of the rotating crankshaft
08
Crankshaft
Converts motor rotation into piston movement
09
Connecting Rod
Links the crankshaft to the piston
10
Wrist Pin
Pivot point connecting piston and connecting rod
11
Piston
Compresses refrigerant within the cylinder
12
Internal Discharge Tube
Channels compressed gas to the muffler
13
Screw
Fastens various components (e.g., muffler)
14
Discharge Muffler Gasket
Seals the discharge muffler connection
15
Crankcase
Main body housing cylinders and crankshaft
16
Valve Plate Gasket
Seals between crankcase and valve plate
17
Suction Valve
One-way valve for refrigerant intake
18
Discharge Valve
One-way valve for refrigerant outlet
19
Discharge Valve Stopper
Limits discharge valve movement
21
Cylinder Head Gasket
Seals the cylinder head
22
Suction Muffler
Reduces noise from suction gas pulsation
23
Cylinder Head
Covers the cylinder, part of compression chamber
24
Cylinder Head Screw
Secures the cylinder head
25
Rotor
Rotating part of the electric motor
26
Oil Pump
Circulates oil for lubrication
27
Stator
Stationary electromagnetic part of the motor
28
Stator Case
Holds and positions the stator
29
Suspension Spring
Vibration isolation mounting
30
Compressor Housing
Main hermetic (sealed) outer shell
31
Hermetic Terminal
Electrical connection into sealed housing
32
Base Plate
Foundation for internal assembly mounts
Why This Knowledge Matters for Your Business
Whether you’re a technician diagnosing a faulty discharge valve or a sourcing manager looking for a genuine SECOP crankshaft, this visual guide empowers you with precision. Correct part identification:
Reduces Downtime: Enables faster, accurate diagnosis.
Ensures Compatibility: Guarantees replacement parts match the exact SCE model specifications.
Promotes Effective Communication: Allows clear reference between teams, suppliers, and clients.
The Grundfos CR20-06 A-F-A-E-HQQE is a vertical multistage centrifugal pump delivering 21 m³/h at 70.4 m head with a 7.5 kW IE3 motor, designed for demanding water boosting and industrial applications. Its cast‑iron base, stainless‑steel internals and HQQE mechanical seal make it a durable, energy‑efficient solution for process water, HVAC, boiler feed and general pressure boosting systems.
Introduction
In modern industry and building services, stable water pressure is no longer a luxury but a basic requirement. The Grundfos CR20-06 A-F-A-E-HQQE has become one of the quiet workhorses in this field, combining compact vertical design with serious performance for installations where downtime is simply not an option.
Technical profile of the CR20-06
The pump in the photo is clearly identified on its nameplate as a Grundfos CR20-06 A-F-A-E-HQQE with a 7.50 kW motor operating at 50 Hz and about 2919 rpm. It delivers a nominal flow of 21 m³/h at a rated head of 70.4 m, with a maximum head up to 88.4 m and a maximum operating pressure of 16 bar at liquid temperatures up to 120 °C.
Main nameplate data
Item
Value
Pump type
CR20-06 A-F-A-E-HQQE
Rated power P2
7.5 kW
Frequency / speed
50 Hz / ≈2919 rpm
Rated flow Q
21 m³/h
Rated head H
70.4 m
Maximum head Hmax
88.4 m
Maximum pressure / temp.
16 bar / 120 °C
Shaft seal code
HQQE (single mechanical seal)
Pump orientation
Vertical, inline
Efficiency (pump)
≈75.6% (MEI ≥ 0.70)
The pump uses a vertical, inline layout with suction and discharge on the same level (DN 50 flanged connections, PN 25 rating), simplifying installation in compact plant rooms and on rigid pipe manifolds. Its IE3 motor (size 132SB) offers motor efficiencies above 90% at typical loads, helping operators reduce long‑term energy costs.
Construction, materials and seal
The CR20-06 belongs to the widely used CR multistage family, where several impellers are stacked in series to build pressure while maintaining moderate flow. In this specific model, the base and pump head are in cast iron, while all wetted parts such as impellers and chambers are stainless steel AISI 304, providing a good balance between robustness and corrosion resistance for clean water duties.
The HQQE mechanical seal is a single cartridge seal with silicon carbide/silicon carbide faces, EPDM elastomers and a stainless‑steel spring, designed for long service life and easy replacement. This configuration suits cold and hot water, mildly aggressive media used in HVAC and process plants, and reduces the risk of dry‑running damage during commissioning or transient operating conditions.
Typical applications and operating benefits
With its 21 m³/h at 70.4 m operating point, the CR20-06 is well suited to medium‑pressure boosting in commercial buildings, industrial wash and rinse systems, boiler feed for small to mid‑size boilers, and general process water circulation. Installers appreciate the inline design, which often allows direct replacement of older horizontal pumps without major changes to the pipework, while plant operators value the quiet operation and low vibration levels of the multistage design.
From an energy perspective, the combination of high hydraulic efficiency and IE3 motor makes this model a strong candidate in projects where life‑cycle cost analysis is required or where regulations demand a minimum efficiency index (MEI ≥ 0.70). Paired with an external frequency converter, the CR20-06 can be turned into a variable‑speed booster, maintaining constant pressure in domestic water systems, process loops or district cooling circuits while cutting energy consumption during partial‑load operation.
Practical selection notes for engineers
When selecting a CR20-06 for a project, engineers typically start from the required duty point on the pump curve and verify that 21 m³/h at around 70 m head fits the system’s pressure losses, static height and safety margin. System designers also check NPSH requirements, temperature range from −20 to 120 °C, and maximum ambient temperature up to 60 °C to ensure trouble‑free operation in machinery rooms and outdoor installations.
Because the pump offers a maximum operating pressure of 16 bar with PN 25 flanges, it can be integrated into higher‑pressure manifolds and ring mains, provided that upstream valves, fittings and vessels share compatible ratings. For users planning future upgrades, the CR range gives a modular platform: additional models and variants can be combined in parallel booster sets, or replaced one‑to‑one if system demand increases.
Mbsmpro.com, ZB38, 5HP, R404, MBP
Category: Refrigeration
written by www.mbsmpro.com | December 23, 2025
ZB38 5HP R404 MBP correspond à un compresseur scroll Copeland Emerson, modèle ZB38KQE ou ZB38KCE, puissance nominale 5 HP, conçu pour le fluide frigorigène R404A et destiné au service moyenne température (MBP = Medium Back Pressure).
Caractéristiques typiques:
Type: Scroll hermétique Copeland série ZB38 (Emerson).
Puissance: 5 HP, triphasé 380–400 V (suivant version TFD-551 / -558).
Fluide: optimisé pour R404A (souvent aussi compatible R507A, parfois R134a selon la plaque).
Déplacement volumétrique: environ 14,4 m³/h; puissance frigorifique autour de 7–11 kW selon conditions (Te/Tc).
Signification de ton code:
ZB38 = série de compresseurs scroll réfrigération Copeland, taille « 38 ».
5HP = puissance moteur nominale.
R404 = fluide R404A prévu pour ce modèle.
MBP = utilisation en température moyenne (évaporation typique -10 °C à +5 °C pour chambres froides positives, conservateurs…).
Si tu précises les conditions de travail (Te, Tc, sous-refroidissement, surchauffe), il est possible d’estimer la capacité frigorifique exacte et vérifier si ce compresseur est adapté à ta chambre froide ou ton évaporateur actuel.
In commercial refrigeration, the compressor is more than just a component; it is the engine that decides whether a cold room runs smoothly or becomes a constant source of service calls. The ZB38 5HP R404A MBP scroll compressor is one of those models that technicians encounter again and again in supermarkets, butcheries, bakeries and restaurant cold rooms. Its popularity comes from a balance of capacity, efficiency and robustness that fits the core needs of medium-temperature systems.
What ZB38 5HP R404A MBP Really Means
When technicians talk about “ZB38 5HP R404A MBP”, they are compressing a lot of technical information into a short code.
ZB38: Indicates a scroll refrigeration compressor series and displacement class, typically around 5 HP in the manufacturer’s lineup.
5HP: The nominal motor power, placing it in the range commonly used for medium-sized cold rooms and supermarket display lines.
R404A: The main refrigerant for which the compressor is optimized, historically a standard in commercial refrigeration despite ongoing phase-down discussions in many markets.
MBP (Medium Back Pressure): Specifies that the compressor is designed for medium-temperature applications such as positive-temperature cold rooms, fresh products, dairy and beverages, rather than deep-freeze low-temperature duties.
This decoding matters because each part of the designation tells the technician where the compressor can work safely, which refrigerant is acceptable and what kind of evaporating temperatures the system can handle without pushing the compressor beyond its envelope.
Typical Applications in the Field
A 5HP R404A MBP scroll compressor naturally positions itself in the heart of medium-sized commercial installations.
Cold rooms for fresh meat, fruits and vegetables, where evaporating temperatures often range roughly between −10∘C−10∘C and +5∘C+5∘C, depending on the product and humidity control strategy.
Supermarket wall cases and island cabinets for dairy, delicatessen and beverages, where multiple evaporators may be connected to a single condensing unit based on the ZB38 platform.
Food-service equipment in hotels, central kitchens and bakeries, where reliability and quick recovery after door openings are more important than extreme low temperatures.
In these contexts, the ZB38 class compressor offers enough capacity to manage a significant thermal load while remaining compact, which is crucial when equipment must fit on rooftops, balconies or tight machine rooms in dense urban environments.
Why Scroll Technology Dominates This Segment
Scroll compressors like the ZB38 have progressively replaced many traditional reciprocating models in MBP applications.
Fewer moving parts reduce mechanical noise, vibration and wear, which in practice often means fewer mechanical failures and smoother operation.
The continuous compression process delivers stable mass flow, improving evaporator performance and temperature control inside cold rooms and cabinets.
The compact, hermetic construction simplifies installation, reduces the risk of leaks at mechanical joints and helps manufacturers build more compact condensing units.
For technicians, scrolls are often easier to handle: electrical connections are straightforward, and the absence of complex valve mechanisms or external crankcase components shortens installation and troubleshooting time when compared with older piston designs.
Key Operating Parameters Technicians Monitor
Working with a 5HP R404A MBP compressor requires attention to several practical parameters, even if the data sheet is not in hand.
Evaporating temperature: Usually in the medium range, technicians watch suction pressure to ensure it stays within the recommended envelope, avoiding both overloading and poor oil return.
Condensing temperature: Condenser cleanliness, ambient temperature and fan control directly impact discharge pressure, compressor current and overall energy consumption.
Superheat and subcooling: Correct expansion valve setting and a stable liquid line temperature help prevent liquid slugging at start-up and maintain the right mass flow through the evaporator.
In practice, a well-adjusted system keeps the compressor within its design envelope during the hottest days of summer, which is often where installations in Mediterranean climates are pushed to their limits.
Installation and Start-Up Best Practices
Even the most robust compressor can fail prematurely if basic installation guidelines are ignored.
Cleanliness: Piping must be brazed with nitrogen purging and thoroughly evacuated to remove moisture and contaminants that can degrade oil and valves.
Oil management: Proper piping design, especially at the suction line and oil traps on vertical risers, ensures oil returns reliably to the compressor shell.
Electrical checks: Before energizing, technicians confirm supply voltage, phase sequence and proper overload protection, including verification of contactor and breaker sizing.
A disciplined start-up procedure—monitoring pressures, temperatures and compressor current over the first hour—usually reveals whether the system is healthy or if there are hidden issues like undersized condensers or incorrect charge.
Maintenance and Diagnostic Considerations
In daily practice, maintenance teams use a few key indicators to assess the health of a scroll compressor like the ZB38.
Noise and vibration: Changes in sound signature can announce mechanical damage, liquid return or severe gas under-cooling at the compressor.
Discharge line temperature: Excessive discharge temperature often points to high condensing pressure, low refrigerant charge or poor suction gas cooling.
Oil color and level (if visible through an indicator): Darkened or acidic oil is a clear warning that the system has experienced overheating or contamination, and that deeper corrective action is required.
Regular cleaning of condensers, checking fan operation and verifying that defrost cycles are effective in evaporators can significantly extend compressor life by keeping operating conditions within design limits.
Where This Technology Is Heading
Although R404A has long been the standard for MBP commercial applications, environmental regulations are pushing the market toward lower-GWP alternatives and redesigned compressors. Manufacturers are gradually adapting similar 5HP scroll platforms to new blends with different pressures and glide characteristics, while technicians increasingly need to be familiar with multiple refrigerants and their specific charge and oil requirements. For users and contractors, this transition highlights the importance of good documentation, training and practical feedback from the field—an area where communities of technicians, independent platforms such as mbsmgroup.tn and projects like mbsm.pro, mbsmgroup and mbsmpro.com can play a useful role in sharing real-world experience and solutions.
Suggested exclusive images for this topic (you can create or photograph them yourself):
A close-up of a 5HP scroll compressor label showing model code, refrigerant and electrical data.
A medium-temperature cold room condensing unit with the compressor, condenser and control box visible on a rooftop or service balcony.
A technician’s hand holding clamp meter and manifold gauges connected to a running MBP R404A condensing unit.
A clean, well-lit cold room interior with product on shelves, showing air coolers on the ceiling and neat piping.
A side-by-side photo of a scroll compressor and an older reciprocating unit on a workshop floor, demonstrating the difference in size and design.
