Excellent Compressor GS66AZ: A Comprehensive Technical Overview and Replacement Guide

The GS66AZ is a robust and efficient hermetically sealed compressor designed for light commercial and high-demand domestic refrigeration applications. Engineered for reliability within specific thermal envelopes, this model represents a key component in sustaining consistent cooling performance. Its specifications indicate a design focused on energy efficiency and durable operation under continuous use conditions. This article provides a detailed technical breakdown, replacement guidelines, and practical insights for technicians and procurement specialists.

Complete Technical Specifications of the GS66AZ Compressor

Parameter	Specification for GS66AZ
Model	GS66AZ
Utilisation	LBP (Low Back Pressure)
Domaine	Freezing / Low-Temperature Refrigeration
Oil Type and Quantity	Polyester (POE) Oil, specific quantity as per manufacturer datasheet (typically ~350ml)
Horsepower (HP)	Approximately 1/5 HP
Refrigerant Type	R134a
Power Supply	220-240V ~ 50/60Hz, 1 Phase
Cooling Capacity BTU	To be confirmed from official performance curves (est. ~700-900 BTU/hr @ LBP conditions)
Motor Type	RSIR (Resistance Start Induction Run)
Displacement	Model-specific (refer to manufacturer data)
Winding Material	Copper
Pression Charge	Designed for low evaporating pressure applications
Capillary	System-dependent; must be matched to the condenser and evaporator for optimal performance.
Modele Frigo/Refrigerator Compatibility	Designed for low-temperature compartments in domestic refrigerators, standalone freezers, and commercial display freezers.
Temperature function	Optimal performance between -30°C to -10°C evaporating temperature range.
With fan or no	Typically used in fan-cooled condenser systems.
Commercial or no	Yes, Light Commercial / Heavy Domestic.
Amperage in function	Approx. 1.3 – 1.5 A at rated voltage and load.
LRA (Locked Rotor Amps)	To be confirmed from manufacturer label (typically 6-8 times running amps).
Type of relay	PTC (Positive Temperature Coefficient) Start Relay.
Capacitor or no and value	No run capacitor (RSIR design). PTC relay provides starting assistance.
5 Compressor replacements of same value in same gas (R134a)	GN66AZ, GE66AZ, GR66AZ, GJ66AZ, GP66AZ (Always verify model suffixes for exact electrical and mechanical compatibility).
5 Compressor replacements of same value in other gas	Models designed for R600a (e.g., GN60AZ series) or R404A/R290 will have different electrical characteristics and are NOT direct drop-in replacements. System conversion required.

Deep Dive: Application and Engineering Context

The LBP (Low Back Pressure) designation is crucial. It means this compressor is engineered to pump refrigerant where the evaporator (cooling compartment) operates at a very low pressure, corresponding to the -30°C to -10°C temperature range essential for freezing. This contrasts with MBP (Medium Back Pressure) compressors used for fresh food cooling (typically -5°C to +10°C) and HBP (High Back Pressure) units for air conditioning or beverage coolers.

Comparison with Other Compressor Types

Feature	GS66AZ (LBP, R134a)	Typical MBP Compressor (e.g., for refrigerator section)	Miniature DC Compressor (e.g., for portable fridge)
Primary Use	Freezing / Deep Cooling	Fresh Food Preservation	Portable, 12/24V Applications
Efficiency at Low Temp	High (Optimized for this duty)	Poor (will overwork and fail prematurely)	Low to Moderate
Typical HP	1/5 HP to 1/4 HP	1/6 HP to 1/5 HP	< 1/10 HP
System Complexity	Standard AC single-phase	Standard AC single-phase	Requires DC power/control board
Durability	High (Commercial Duty)	Moderate (Domestic Duty)	Low to Moderate

Key Benefits and Selection Advice

• Reliability: The RSIR motor with copper windings offers a simple, robust design well-suited for constant operation.
• Broad Voltage Compliance: The 220-240V 50/60Hz range makes it adaptable to power standards in many regions.
• Energy Consideration: While not an inverter model, its efficiency is optimized within its specified LBP operating window.

Critical Notices for Technicians:

1. Oil Compatibility: POE oil is hygroscopic. Always keep the system open for a minimal time and use proper vacuum procedures to avoid moisture contamination and acid formation.
2. Electrical Verification: Always check the actual nameplate on the unit. While the GS66AZ is common, suffixes may indicate different plug types or minor performance tweaks.
3. Non-Direct Replacements: Swapping to a compressor using a different refrigerant (like R600a or R290) is not a simple plug-and-play. It requires changing the capillary tube, possibly the filter-drier, and ensuring correct oil charge, making it a job for qualified professionals.
4. Overheating Protection: Ensure the original system’s overload protector and PTC relay are in good condition or replaced when installing a new compressor to prevent burnout.

Conclusion
The GS66AZ compressor is a workhorse for low-temperature refrigeration. Its value lies in its specific engineering for freezing applications, commercial-grade durability, and straightforward RSIR design. Successful implementation and replacement hinge on respecting its LBP designation, ensuring electrical compatibility, and following rigorous installation practices to ensure long system life and reliable performance.

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Excerpt: The GS66AZ is a robust hermetically sealed compressor designed for light commercial and domestic freezing applications. This guide provides full technical specifications, including its LBP use for…

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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:

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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

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2. Performance Specifications

Example: T Series Compressors (R600a)

Example: S Series Compressors (R600a)

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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.

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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: $105\text{W}\times 1.5\text{to}2=157.5\text{to}210\text{liters}$

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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.

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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.

• 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.

 

Danfoss compressors are widely recognized for their reliability and efficiency in various refrigeration and air conditioning systems. This article provides a detailed overview of the specifications of different Danfoss compressor models, focusing on capillary length, oil quantity, horsepower, and their respective applications.

Introduction to Danfoss Compressors

Danfoss is a global leader in engineering solutions, particularly in the field of refrigeration and air conditioning. Their compressors are designed to meet the demanding requirements of both commercial and residential applications. The compressors are known for their durability, energy efficiency, and low noise levels.

Key Specifications

The following table outlines the key specifications of various Danfoss compressor models:

Capillary Length (Feet)	Capillary Length (cm)	Capillary NO	Oil	Hp (Horsepower)	Compressor No
4 Feet	121.92 cm	0.26	150 ml	1/14	TL2A
4 Feet	121.92 cm	0.26	150 ml	1/12	TL2.5A
4 Feet	121.92 cm	0.26	150 ml	1/12	TL2.5B
4 Feet	121.92 cm	0.26	150 ml	1/14	PW3K6
4 Feet	121.92 cm	0.26	150 ml	1/12	PW3K7
6 Feet	182.88 cm	0.26	175 ml	1/10	PW3.5K7
6 Feet	182.88 cm	0.26	175 ml	1/10	TL3B
7.5 Feet	228.6 cm	0.28	200 ml	1/8	TL4B
7.5 Feet	228.6 cm	0.28	200 ml	1/8	TL4A
7.5 Feet	228.6 cm	0.28	200 ml	1/8	PW4.5K9
7.5 Feet	228.6 cm	0.28	200 ml	1/8	PW4.5K7
7.5 Feet	228.6 cm	0.28	200 ml	1/8	PW4.5K11
7.5 Feet	228.6 cm	0.28	200 ml	1/8	TFS4AT
9 Feet	274.32 cm	0.31	250 ml	1/6	TL5A
9 Feet	274.32 cm	0.31	250 ml	1/6	PW5.5K11
9 Feet	274.32 cm	0.31	250 ml	1/6	PW5.5K9
9 Feet	274.32 cm	0.31	250 ml	1/6	TFS5AT
9 Feet	274.32 cm	0.31	250 ml	1/6	FR6B
10 Feet	304.8 cm	0.31	275 ml	1/5	FR7.5A
10 Feet	304.8 cm	0.31	275 ml	1/5	FR7.5B
10 Feet	304.8 cm	0.31	300 ml	1/4	FR8.5A

Detailed Analysis

1. Capillary Length: The capillary length varies from 4 feet (121.92 cm) to 10 feet (304.8 cm). The length of the capillary tube is crucial as it affects the refrigerant flow and system efficiency.
2. Capillary Number: This parameter indicates the internal diameter of the capillary tube, which influences the refrigerant flow rate. The capillary number ranges from 0.26 to 0.31.
3. Oil Quantity: The oil quantity in the compressors ranges from 150 ml to 300 ml. Proper oil levels are essential for lubrication and cooling of the compressor components.
4. Horsepower (Hp): The horsepower of the compressors varies from 1/14 Hp to 1/4 Hp. This indicates the power output and suitability for different cooling capacities.
5. Compressor Number: Each compressor model has a unique identifier, such as TL2A, PW3K6, etc. These numbers help in identifying the specific model and its application.

Applications

Danfoss compressors are used in a variety of applications, including:

• Commercial Refrigeration: Models like TL2A and TL2.5A are commonly used in small commercial refrigeration units.
• Residential Air Conditioning: Compressors such as PW3K6 and PW3K7 are suitable for residential air conditioning systems.
• Industrial Cooling: Higher capacity models like FR7.5A and FR8.5A are used in industrial cooling applications.

Conclusion

Danfoss compressors offer a wide range of models to meet diverse refrigeration and air conditioning needs. Understanding the specifications, such as capillary length, oil quantity, and horsepower, is essential for selecting the right compressor for your application. With their robust design and efficient performance, Danfoss compressors continue to be a preferred choice in the industry.

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