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

• GM35AF
• GM55AF
• GM70AF
• GM66AF
• GM75AF
• GM77AF
• GM80AF
• GM91AF
• GM80AF

LBP Compressors with R134A Refrigerant: A Comprehensive Overview

LBP compressors, renowned for their reliability and efficiency, are widely used in various refrigeration applications. This article delves into the specifications of a range of LBP compressors that utilize R134A refrigerant, providing detailed information on their performance parameters and operational characteristics.

Table of Specifications

The table below outlines the key specifications for each model of the LBP compressors:

Key Features and Performance Metrics

1. Displacement : The displacement values range from 3.50 cm³ to 9.10 cm³, indicating the volume of refrigerant that can be compressed per cycle. Higher displacement models like GM 91 AF are suitable for larger cooling capacities.
2. Operating Voltage : All models operate within the voltage range of 187-264V at a frequency of 50Hz, ensuring compatibility with standard electrical supplies.
3. Power HP : The power ratings vary from 1/10 HP to 1/4+ HP, reflecting the energy consumption and output capacity of each compressor. Models with higher power ratings, such as GM 80 AF and GM 91 AF, are designed for more demanding applications.
4. Nominal Capacity : The nominal cooling capacities range from 65 Kcal to 198 Kcal, catering to different cooling requirements. For instance, the GM 80 AF and GM 80 AF + kap models both offer a high cooling capacity of 198 Kcal.
5. COP (Coefficient of Performance) : The COP values indicate the efficiency of the compressors, with higher values signifying better performance. The GM 66 AF model boasts a COP of 1.28, making it one of the most efficient in the lineup.
6. Motor Type : Most models feature RSIR/RSCR motor types, known for their robustness and reliability. The GM 80 AF + kap model, however, uses a CSCR motor type, which may offer additional benefits depending on the application.
7. Capacitor Used : The capacitors used range from 2 µF to 4 µF, aiding in the starting and running of the motors. The GM 80 AF + kap model, with its additional start capacitor, ensures smoother operation under varying load conditions.

Additional Notes

• All the models listed can be equipped with RUN CAPACITORS upon request, enhancing their performance and longevity.
• The GM 80 AF + kap model is specifically designed with an additional start capacitor, making it ideal for applications requiring enhanced starting torque.

In conclusion, the LBP compressors with R134A refrigerant offer a versatile range of options to meet diverse cooling needs. Their robust design, coupled with high efficiency and reliability, makes them a preferred choice for various refrigeration systems.