Le compresseur hermétique ZMC GM70AZ, visible sur l’étiquette de la photo, est un modèle fonctionnant au réfrigérant R134a, conçu pour les applications à basse pression d’aspiration dans le froid ménager. Fabriqué en Égypte par Misr Compressor Manufacturing Co. (ZMC), il cible les réfrigérateurs et congélateurs domestiques alimentés en 220–240 V, 50 Hz, très répandus en Afrique du Nord et au Moyen‑Orient.​​

Caractéristiques techniques essentielles

Le GM70AZ appartient à la famille de compresseurs LBP (Low Back Pressure), avec une plage d’évaporation typique d’environ −30 °C à −10 °C adaptée au froid négatif. Il fonctionne au réfrigérant R134a, avec un refroidissement du moteur par convection statique et une alimentation monophasée 220–240 V, 50 Hz comme indiqué sur l’étiquette.​​

Ce compresseur offre une puissance de l’ordre de 1/5 HP, ce qui le positionne pour des réfrigérateurs et congélateurs ménagers de petite à moyenne capacité. Il est fourni avec des connexions brasées pour aspiration, refoulement et process, ce qui facilite son intégration dans les circuits frigorifiques standards des fabricants et des ateliers de maintenance.​

Tableau – Données techniques typiques ZMC E/GM70AZ

Paramètre	Valeur indicative
Modèle	GM70AZ / EGM70AZ ​
Réfrigérant	R134a ​
Application	LBP (basse pression d’aspiration) ​
Plage de Te	−30 °C à −10 °C ​
Tension / fréquence	220–240 V ~ 50 Hz, 1 Ph ​​
Type de compresseur	Hermétique à piston (reciprocating) ​
Refroidissement compresseur	Statique ​
Domaine d’utilisation typique	Réfrigérateurs / congélateurs domestiques ​

Enjeux pour le froid domestique

Les compresseurs GM70AZ et EGM70AZ s’inscrivent dans la stratégie industrielle de ZMC visant à fournir des compresseurs hermétiques compétitifs pour les fabricants de réfrigérateurs et les marchés de rechange. Grâce à leur compatibilité avec le R134a, ils restent courants dans les appareils existants, même si le secteur s’oriente progressivement vers des réfrigérants à plus faible GWP comme le R600a.​

Pour les techniciens frigoristes, l’identification correcte du modèle et du gaz, comme on le voit clairement sur l’étiquette GM70AZ, est essentielle pour respecter les conditions de fonctionnement (tension, plage d’évaporation, type de détente capillaire) et garantir longévité et efficacité énergétique. Ce type de compresseur est largement utilisé dans les ateliers de service en Tunisie, en Égypte et dans la région MENA, où les pièces ZMC sont facilement disponibles.

​

The EGM91AA is a hermetic reciprocating compressor manufactured by ZMC, designed primarily for use with R134a refrigerant. It operates on a voltage range of 220-240V at 50Hz and is typically used for low back pressure (LBP) refrigeration applications like household refrigerators and freezers.​​

Main Specifications

• Refrigerant: R134a​​

• Application: LBP (Low Back Pressure)​

• Power: 1/4 HP​

• Voltage/Frequency: 220-240V, 50Hz​​

• Motor Type: RSIR/CSIR​

• Starting Device: PTC QP2-15Ω​

• Oil Charge: 180 cm³ esters (POE)​

• CE certified​​

Technical Details

• Evaporating Temperature Range: -30°C to -10°C (suitable for refrigeration, not deep freeze)​

• Maximum Motor Temperature: 130°C​

• Locked Rotor Current: 6.78 A​

• Voltage Working Range: 187-264V​

• Compressor Cooling: Static​

• Expansion device: Capillary tube​

Typical Uses

• Household refrigerators

• Small commercial refrigerators

• Appliances using R134a needing 1/4 HP compressor power​

This model is manufactured in Egypt and is widely compatible with fridges operating in regions where 220-240V, 50Hz power is standard

For the EGM91AA (LBP, R134a), the answer leans more to freezing / low‑temperature cooling, but it is used for both refrigerators and freezers depending on the system design.​

What LBP means

• LBP = Low Back Pressure, which corresponds to low evaporating temperatures, typically about −30 °C to −10 °C.​

• Such compressors are commonly used in freezers, deep freezers, and low‑temperature refrigerator compartments.​

So for EGM91AA

• Its data sheet lists application = LBP with evaporating range −30 °C to −10 °C, exactly the range used for freezer or low‑temperature refrigerator circuits.​

• Practically: if you charge and size the capillary for −25/−30 °C, it works as freezing; if you design around −12/−10 °C, it becomes strong cooling / chiller level.

The EGM91AA compressor from ZMC stands out as one of the most notable solutions in the domestic and light commercial refrigeration sector thanks to its use of R134a refrigerant and its high efficiency under varying climatic conditions. It delivers optimal cooling performance for refrigerators operating on 220–240 V, 50 Hz power, making it a practical choice for both local and international markets. Its advanced technical features translate into quick response, reduced energy consumption, and excellent compatibility with household systems, providing reliable performance backed by solid regional manufacturing.​​

Journalistic introduction

In the fast‑moving world of refrigeration technology, real innovation often hides in the small components that only technicians and specialists tend to notice. At the core of every modern refrigerator, a compressor sets the rhythm for the entire system’s life span and efficiency, and the EGM91AA model is a clear illustration of this principle. A compact steel shell, carefully engineered handling of R134a refrigerant, and optimized power consumption come together to keep food safe and temperatures stable even when ambient heat pushes equipment to its limits.​​

This compressor is more than a metal capsule in a sealed circuit; it is a technical product with a manufacturing story that starts in Egypt and extends across regional markets serving home refrigeration. Designed for 220–240 V, 50 Hz grids and carrying CE conformity, it offers installers and repair professionals a unit that combines robustness, availability of spare parts, and predictable behavior in low back‑pressure applications. As local industries expand their capabilities, models like the EGM91AA show how regional manufacturing can compete in quality while remaining accessible to small workshops and major appliance brands alike.​​

Technical specifications table for EGM91AA

Determining the cooling capacity of air conditioning and refrigeration compressors is fundamental for professionals in the HVAC industry. One of the key electrical values specified on compressor labels is the LRA (Locked Rotor Amps), which represents the maximum current drawn at motor start. Transforming this into tons of cooling provides a rapid and reliable way to size, diagnose, and upgrade systems.

What is LRA and Why Convert it to Tons?

• Locked Rotor Amps (LRA): The peak current when a compressor starts. It is vital for sizing electrical protection and understanding performance.

• Cooling Ton: Standard unit for cooling capability (1 ton = 12,000 BTU/hr).

The Simple Conversion Formula

For single-phase compressors, the modern, professional formula is:

$$Ton=LRA/36$$

Example:
If the compressor’s LRA is 54:
Ton = 54 / 36 = 1.5 Ton

Always use the division symbol (/) instead of horizontal lines for cleaner, easier-to-read formulas in technical documentation.

Benefits and Use Cases

• Quick Unit Sizing: Helpful when label information is limited or during site evaluations.

• Matching Electrical Loads: Ensures new or replacement units are compatible with existing infrastructure.

• Field Troubleshooting: Arms technicians with a fast check for expected capacity vs. measured electrical consumption.

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Summary:
This guide explains how to convert LRA into cooling tons using a direct and easy-to-use formula (LRA / 36 = Ton). It streamlines sizing, troubleshooting, and matching of commercial HVAC and refrigeration compressors, ensuring professional and efficient results in the field.

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Quick Reference Table: LRA / 36 = Ton

By using this updated formula and professional writing style, technicians and engineers benefit from fast and transparent conversions that enhance reliability and accuracy in every HVAC task.

Performance Analysis of the BSA645CR Compressor with Horsepower Calculation

1. Introduction

The BSA645CR is a constant-speed reciprocating compressor designed for refrigeration and air conditioning systems using R134a refrigerant. It is commonly used in residential and light commercial applications due to its compact design, efficiency, and compatibility with standard voltage supplies.

This article provides a detailed overview of the BSA645CR compressor’s technical specifications, explains how to calculate its output horsepower (HP), and discusses its performance characteristics.

2. Technical Specifications of

Compressor Specifications:

1. Model Name: LG LBP MB88NA
   • This is the specific model number of the compressor manufactured by LG.
2. Power Consumption: 151 W
   • The compressor consumes 151 watts of electrical power during operation. This indicates the energy efficiency of the unit.
3. Horsepower (HP): 1/5 HP
   • The compressor has a motor rated at 1/5 horsepower , which is equivalent to 0.2 HP . This is a relatively small compressor, typically used in compact refrigeration systems or appliances like mini-fridges or beverage coolers.
4. Refrigerant Type: R600a
   • R600a (isobutane) is an eco-friendly refrigerant with low global warming potential (GWP). It is commonly used in domestic refrigerators and freezers due to its energy efficiency and minimal environmental impact. However, it is flammable, so proper handling is required.
5. Electrical Configuration: 1 Phase, 220V, 50Hz
   • The compressor operates on a single-phase power supply with a voltage of 220 volts and a frequency of 50 hertz . This configuration is typical for residential applications in regions like Europe, Asia, and parts of Africa.

Applications:

Given the specifications, this compressor is likely designed for use in low-back pressure (LBP) systems. LBP compressors are typically used in:

• Household refrigerators
• Freezers
• Beverage coolers
• Compact cooling appliances

The R600a refrigerant further confirms that this compressor is intended for smaller, energy-efficient cooling systems.

Key Considerations:

1. Environmental Impact:
   • R600a is a hydrocarbon refrigerant, making it environmentally friendly compared to older refrigerants like R134a or R22. However, it requires careful handling due to its flammability.
2. Voltage Compatibility:
   • Ensure that the power supply matches the compressor’s requirements (220V, 50Hz). Using incompatible voltage can damage the compressor or cause it to malfunction.
3. System Design:
   • Since this is an LBP compressor, it is optimized for systems with lower evaporating temperatures, such as freezers or deep-freeze applications.

Conclusion:

The LG LBP MB88NA compressor is a compact, energy-efficient unit designed for small-scale refrigeration systems. Its key features include:

• Low power consumption (151W)
• Eco-friendly refrigerant (R600a)
• Compatibility with 220V, 50Hz power supplies
• Suitable for low-back pressure applications

https://www.mbsm.pro/wp-content/uploads/2025/04/Mbsm_dot_pro_private_PDFMbsm_dot_pro_private_PDF_S26TY.pdf

The P14TY is a refrigerant compressor model listed in the provided datasheet, designed for use in refrigeration or air conditioning systems. Below is a summarized technical breakdown of its key specifications:

P14TY Compressor Specifications

Key Observations

1. Refrigerant (R12):
   • The P14TY is designed for R12, an obsolete CFC refrigerant banned under the Montreal Protocol due to ozone depletion. Modern alternatives (e.g., R134a, R404A) require retrofitting or replacement.
2. Applications:
   • Likely used in medium-temperature refrigeration (e.g., commercial refrigerators, chillers) given its capacity and COP at -25°C evaporating temperature.
3. Efficiency (COP 1.73):
   • Lower COP compared to modern compressors, indicating higher energy consumption.
4. Replacement Considerations:
   • If retrofitting for alternative refrigerants, ensure compatibility with oil type (e.g., POE for HFCs) and system components.
   • Verify electrical specs (voltage, starting torque) for new installations.

Testing Conditions (CECOMAF/ASHRAE)

• Evaporating Temp: -25°C (LBP testing for low-temperature applications).
• Condensing Temp: 55°C.
• Ambient Temp: 32°C.

Actionable Recommendations

• For Maintenance:
  • Check oil levels and contamination if still using R12.
  • Inspect capacitors/relays (common failure points in CSIR motors).
• For Replacement:
  • Consider modern equivalents (e.g., Panasonic/Copeland models for R404A/R134a).
  • Consult HVAC technician for system compatibility and retrofitting.

Siberia Compressor Catalogue Overview

The Siberia Compressor Catalogue provides detailed specifications and performance data for various compressor series designed for refrigeration systems. These compressors are available in multiple configurations, including R134a and R600a refrigerants, catering to different cooling capacities and applications. Below is an organized breakdown of the catalog’s key sections:

1. Compressor Series Overview

S Series (Low Back Pressure – LBP)

• Refrigerants: R600a (High Efficiency), R600a (Medium Efficiency), R134a
• Applications: Suitable for small to medium-sized refrigerators.
• Key Features:
  • Compact design
  • Low noise and vibration
  • High reliability

V Series (Low Back Pressure – LBP)

• Refrigerants: R600a, R134a
• Applications: Ideal for compact refrigeration units.
• Key Features:
  • Energy-efficient operation
  • Small footprint
  • Environmentally friendly refrigerants

F Series (Low Back Pressure – LBP)

• Refrigerants: R134a, R600a
• Applications: Designed for larger refrigeration systems.
• Key Features:
  • High cooling capacity
  • Multiple motor types (RSIR/RSCR)
  • Robust performance under varying conditions

T Series (Low Back Pressure – LBP)

• Refrigerants: R600a, R134a
• Applications: Versatile use in household and commercial refrigeration.
• Key Features:
  • Very compact size
  • Low noise and vibration
  • High reliability

2. Performance Specifications

Example: T Series Compressors (R600a)

Example: S Series Compressors (R600a)

3. Special Requirements for Refrigerants

R134a Compressors

• The open time of the compressor connection pipe should not exceed 10 minutes .
• Use dedicated vacuum pumps and charging equipment for R134a.
• Avoid using organic substances incompatible with R134a in the refrigeration system.
• Ensure strict control of moisture, impurities, paraffin, silicone oil, and chloride ions.

R600a Compressors

• Follow safety protocols for hydrocarbon refrigerants during installation and operation.
• Do not tamper with the pre-filled specialized oil in the compressor.
• Use appropriate tools and equipment to ensure safe handling of R600a.

4. Refrigerator Size Estimation

The cooling capacity of a compressor determines the refrigerator size it can support. For example:

• BTF60AA (1/7 HP):
  • Cooling Capacity: 105 W
  • Approximate Refrigerator Size: 157.5 – 210 liters
    • Calculation: $105\text{W}\times 1.5\text{to}2=157.5\text{to}210\text{liters}$

5. Outline Drawings and Packaging

Each compressor model includes detailed outline drawings and packaging specifications. For instance:

• Packaging Dimensions:
  • Carton Size: $1120\text{mm}\times 824\text{mm}\times 870\text{mm}$
  • Container Capacity: Up to 28 units per container.

6. General Requirements for Installation and Operation

• Store compressors in a dry, well-ventilated area.
• Avoid tilting or inverting during transportation.
• Install within 10 minutes after removing protective plugs.
• Ensure reliable grounding during operation.
• Avoid high-voltage or vacuum conditions during startup.

To determine the refrigerator size (in liters) that a 1/7 HP compressor can cool, we need to refer to the performance data of the compressors listed in the provided files. Specifically, the BTF60AA compressor (1/7 HP) is a good reference point for this calculation.

Key Specifications for BTF60AA (1/7 HP):

• Cooling Capacity: 105 W
• Refrigerant: R600a
• Voltage: 220-240V / 50Hz

The cooling capacity of a compressor directly correlates with the volume of the refrigerator it can cool. Typically:

• 1 W of cooling capacity can cool approximately 1.5 to 2 liters of refrigerator volume.

Calculation:

For the BTF60AA compressor with a cooling capacity of 105 W , the approximate refrigerator volume it can cool is:

$$\text{Refrigerator Volume}=\text{Cooling Capacity (W)}\times \text{Factor (1.5 to 2)}$$$$\text{Refrigerator Volume}=105\text{W}\times 1.5\text{to}2$$$$\text{Refrigerator Volume}=157.5\text{to}210\text{liters}$$

Table for 1/7 HP Compressor:

Below is a table summarizing the approximate refrigerator size (in liters) based on the cooling capacity of a 1/7 HP compressor:

Compressor Model	Power (HP)	Cooling Capacity (W)	Approximate Refrigerator Size (Liters)
BTF60AA	1/7	105	157.5 – 210

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