Mbsmpro.com | ZMC GL45AN Compressor – R134a, 1/8 HP, LBP Cooling & Freezing Applications

Professional Overview

The ZMC GL45AN is a hermetic refrigeration compressor designed for domestic and light commercial refrigeration systems operating with R134a refrigerant. This model belongs to the LBP (Low Back Pressure) category and is widely used in refrigerators, beverage coolers, small freezers, and under-counter cooling equipment.

Engineered for reliability, low noise, and stable thermal performance, the GL45AN is well adapted for continuous duty cycles in temperature ranges typically found in cooling and light freezing systems. Its compact displacement and efficient motor design make it a common replacement compressor in service and maintenance operations.

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Technical Identity & Operating Principle

The GL45AN operates using a single-phase RSIR motor system, optimized for energy efficiency and smooth start-up. It is oil-lubricated with mineral oil compatible with R134a, ensuring proper lubrication and long service life.

This compressor is designed to work without an external cooling fan, relying instead on natural air convection around the shell, which simplifies installation and reduces failure points.

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Complete Technical Specification Table

Parameter	Value
Model	ZMC GL45AN
Utilisation (MBP/HBP/LBP)	LBP
Domaine (Freezing / Cooling)	Cooling & Light Freezing
Oil Type & Quantity	Mineral Oil – approx. 180 ml
Horsepower (HP)	1/8 HP
Refrigerant Type	R134a
Power Supply	220–240V / 50Hz / 1 Phase
Cooling Capacity (BTU/h)	~450–520 BTU/h
Motor Type	Single-Phase Induction (RSIR)
Displacement	~4.5 cm³
Winding Material	Copper
Pressure Charge	Factory nitrogen holding charge
Capillary Tube	0.031″ – 0.036″ (system dependent)
Compatible Refrigerator Models	Single-door fridge, minibar, beverage cooler
Temperature Function	−30°C to −10°C evaporating
With Fan or No	No fan
Commercial Use	Yes (light commercial)
Amperage (Running)	1.1 – 1.4 A
LRA (Locked Rotor Amps)	~6.5 A
Relay Type	PTC Relay
Capacitor	Not required (RSIR design)

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Electrical Configuration (RSIR System)

The GL45AN uses a Resistance Start Induction Run configuration:

• Start winding activated via PTC relay
• No run capacitor required
• Thermal overload protection integrated
• Designed for stable voltage environments

This configuration reduces component count and improves long-term reliability.

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Application Examples

This compressor is suitable for:

• Domestic refrigerators (single door)
• Hotel minibars
• Beverage display coolers
• Small medical refrigerators
• Undercounter cooling units

It is not recommended for:

• Deep freezing below −35°C
• High back pressure systems
• Large commercial freezer cabinets

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Performance Comparison (Same Class)

Model	Refrigerant	HP	Displacement
ZMC GL45AN	R134a	1/8	4.5 cc
Secop TLES5.7	R134a	1/6	5.7 cc
Embraco EM2X60	R134a	1/6	6.0 cc
Huayi HYE45	R134a	1/8	4.5 cc

The GL45AN offers lower energy consumption compared to higher-displacement compressors, making it ideal where efficiency and compact size are required.

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Replacement Compressors – Same Refrigerant (R134a)

1. Embraco EM2X45
2. Secop TLES4.8
3. Huayi HYE45
4. Donper GFF45AA
5. LG MA45LAEG

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Replacement Compressors – Other Refrigerants (With System Modification)

1. Embraco EGX70 (R600a)
2. Secop TLY5.7 (R600a)
3. Huayi HYB45 (R600a)
4. Donper GHF50 (R600a)
5. LG MA53LAG (R600a)

System oil, capillary, and dryer must be adapted.

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Engineering Advice & Best Practices

• Always replace the filter dryer when installing
• Evacuate system to below 500 microns
• Maintain condenser airflow clearance
• Match capillary length precisely
• Avoid overcharging; R134a is sensitive to charge quantity

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Key Benefits

• Low vibration & quiet operation
• Proven durability in field use
• Easy replacement compatibility
• Stable cooling under voltage fluctuation
• Widely available service parts

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Frequently Asked Question

Can the ZMC GL45AN be used in a freezer?

Yes, it can operate in light freezing applications down to approximately −30°C evaporating temperature, provided the system is correctly sized and ventilated.

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ZMC GL45AN Compressor R134a 1/8 HP | Technical Specs & Replacement Guide

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Professional guide to the ZMC GL45AN compressor: R134a, 1/8 HP, LBP refrigeration use, specifications, replacements, applications, and expert installation advice.

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Excerpt

The ZMC GL45AN is a hermetic refrigeration compressor designed for R134a systems in cooling and light freezing applications. With a 1/8 HP motor, LBP operation, and RSIR electrical design, it delivers stable performance, low noise, and high reliability for domestic and light commercial refrigeration equipment.

Mbsmpro.com, Compressor, STU 120 MT, 1/6 hp class, TEE, Cooling, R600a, 220‑240V 50Hz, LBP, Static, PTC relay, Domestic refrigerator use​​

Technical overview

TEE STU 120 MT U252‑00 is a hermetic reciprocating compressor designed by Türk Elektrik for domestic refrigerators operating on R600a refrigerant at low back pressure conditions. It runs on 220‑240 V, 50 Hz single‑phase supply and is optimized for static condenser systems without forced ventilation.​​

The compressor belongs to the same technical family as the NTU/170MT models, sharing similar motor design, PTCSCR starting system and oil charge concept, with slightly lower swept volume and cooling capacity around the 120 W CECOMAF class. Its compact shell and low current draw make it suitable for slim‑cabinet refrigerators and small freezers in residential kitchens.​​

Complete specification table

Parameter	Value
Model	STU 120 MT U252‑00 (TEE / Türk Elektrik Hermetic Compressors) ​
Utilisation (mbp/hbp/lbp)	LBP, low back pressure for household refrigeration evaporating between about −35 °C and −10 °C ​
Domaine (Freezing/Cooling)	Freezing and high‑efficiency food preservation in small refrigerators and freezers using R600a ​​
Oil Type and quantity	Mineral/alkylbenzene compatible with R600a, typical charge about 170–175 cm³ for this family ​
Horsepower (HP)	Around 1/6 hp class, matching 120 W CECOMAF family performance ​
Refrigerant Type	R600a isobutane refrigerant ​​
Power Supply	1Ph 220‑240 V, 50 Hz, voltage range 176–242 V ​
Cooling Capacity BTU	≈ 410–450 BTU/h at CECOMAF conditions for 120 W class ​
Motor Type	Hermetic single‑phase reciprocating motor, PTCSCR starting system ​
Displacement	Approximately 9–11.5 cm³, derived from 170MT data scaled to 120 class ​
Winding Material	Copper winding, insulation class E ​
Pression Charge	R600a system typically 0.6–0.9 bar suction at −25 °C, 4–8 bar discharge depending on ambient ​
Cappilary	Designed for capillary expansion; typical 0.6–0.7 mm ID, 2.0–2.4 m length for R600a household units of this volume ​
Modele Frigo or refrigerator can work with this compressor	Beko and similar 1‑door and 2‑door domestic fridges and small freezers around 120 L to 220 L volume using R600a ​
Temperature function	Evaporating range about −35 °C to −10 °C, ambient up to 43 °C ​
With fan or no	Static condenser operation (no fan on condenser), optional small evaporator fan in cabinet only ​
Commercial or no	Mainly non‑commercial domestic use; light‑duty commercial use only when within envelope ​
Amperage in function	Around 0.55–0.65 A at nominal load, derived from 170MT value of 0.59 A scaled to 120 W ​
LRA	Locked‑rotor starting current about 10–12 A (170MT has 12.4 A) ​
Type of relay	PTC relay, resistance around 15 Ω for this family ​
Capacitor or no and valeur	Run capacitor 5 µF, 220–240 V as in 170MT design ​
5 Compressor remplacement in same valeur in same gaz	TEE NTU 120 MT 220‑240 V R600a; TEE NTU 130 MT R600a; Huanmei QM60TG R600a LBP; Jingyi JDH80Y R600a LBP; Donper NE60MN R600a LBP (all similar 1/6 hp R600a LBP domestic models) ​
5 Compressor remplacement in same valeur in other gaz	Embraco EMI30CL R134a LBP; Secop (Danfoss) NLX10KK R134a; Cubigel GP12TB R134a; Huayi HYK95AA R134a; ACC HMT80A R134a (capacity and displacement close but different refrigerant) ​

Electrical schematic and control concept

The STU 120 MT uses a PTCSCR starting concept, combining a PTC relay with a run capacitor to provide high starting torque and then drop the start winding after a short delay. The start device connects directly to the compressor’s three pins: common, run, and start, with the overload protector in series with the common line.​

During start‑up, the PTC has low resistance and feeds the start winding; as it heats, its resistance increases, effectively leaving only the run winding and 5 µF run capacitor in the circuit for high efficiency during steady operation. This simple scheme reduces moving parts compared with traditional mechanical relays and improves reliability in domestic refrigerators.​

Performance and application domain

According to the technical family sheet, a 170MT R600a low‑back‑pressure compressor delivers 149 W (Cecomaf) capacity with 1.49 W/W COP and operates from −35 °C to −10 °C evaporating temperature and up to 43 °C ambient. The STU 120 MT model scales these values downward, offering around 120 W capacity, ideal for single‑door fridges, compact combined refrigerators, and small freezers where energy efficiency and low noise are critical.​​

This compressor is optimized for static condenser systems, meaning the heat is rejected through a rear or side grid without a fan, making installation simpler and more silent but requiring correct clearances around the appliance. The PTCSCR motor design and insulation class E protect the windings against common voltage fluctuations on 220‑240 V networks, especially in residential buildings.​

Comparison with NTU 170 MT R600a

Feature	STU 120 MT U252‑00	NTU 170 MT 220‑240 V R600a
Application	LBP, domestic refrigerator/freezer ​	LBP, domestic refrigerator/freezer ​
Refrigerant	R600a ​	R600a ​
Nominal Capacity (Cecomaf)	≈ 120 W ​	149 W ​
COP (Cecomaf)	Around 1.45–1.5 W/W ​	1.49 W/W ​
Displacement	≈ 9–11.5 cm³ ​	11.55 cm³ ​
Run Current	≈ 0.55–0.65 A ​	0.59 A ​
LRA	≈ 10–12 A ​	12.4 A ​
Oil Charge	≈ 170–175 cm³ ​	175 cm³ ​
Start Device	PTC relay + 5 µF capacitor ​	PTC relay + 5 µF capacitor ​

The STU 120 MT gives slightly lower cooling capacity but similar energy efficiency, making it better suited to compact cabinets where oversizing would cause short cycling. The NTU 170 MT, with higher displacement, is more appropriate for larger‑volume refrigerators or freezers that need faster pull‑down and higher load handling.​

Installation, exploitation and maintenance advice

For correct operation, the suction line must be well insulated and the capillary length and internal diameter must match the original manufacturer specification; shortening the capillary or increasing its diameter can overload the compressor and reduce evaporator temperature stability. The system must be evacuated to deep vacuum before charging R600a to remove moisture, which can react with the oil and create acids that attack copper windings and internal valves.​​

Only small, precise charges of R600a are allowed because the refrigerant is flammable; work must respect EN and IEC safety standards and be carried out in well‑ventilated areas using certified recovery and charging tools. The overload protector should be kept in its original position, tightly clipped to the compressor shell, since it senses shell temperature and interrupts the circuit if overheating occurs due to locked rotor or high condensing pressure.​​

Periodic maintenance on the refrigerator, such as cleaning the static condenser grid and checking door gaskets, reduces condensing temperature and directly increases COP and compressor life. When replacing the compressor, always replace the filter dryer and, if the system previously had a burn‑out, flush or replace the capillary to avoid residual carbon and sludge.​​

Replacement compressor suggestions

For a direct R600a replacement, matching displacement, evaporating range and electrical characteristics is essential to keep the same cooling performance and energy consumption. Compressors such as TEE NTU 120 MT, NTU 130 MT, or similar 1/6 hp R600a LBP models from other brands (Huanmei, Donper, Jingyi) should be selected with compatible voltage, starting system and mounting footprint.​​

When using R134a alternatives, the technician must redesign capillary length and re‑charge mass, since R134a operates at different pressures and requires polyester oil; examples such as Embraco EMI30CL or Secop NLX10KK offer close cooling capacity but are not drop‑in replacements and require full system conversion. This type of conversion is normally reserved for situations where R600a components are unavailable and the system can be fully opened, cleaned, and re‑engineered.​

Focus keyphrase

TEE STU 120 MT U252‑00 R600a low back pressure refrigerator compressor 220‑240V 50Hz technical data, capacity, wiring, oil charge, replacements

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Excerpt (first 55 words)

TEE STU 120 MT U252‑00 is a hermetic reciprocating compressor from Türk Elektrik designed for domestic refrigerators using R600a refrigerant at low back pressure. It operates on 220‑240 V, 50 Hz single‑phase supply and delivers around 1/6 hp class cooling capacity, ideal for compact fridges and small freezers.

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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Focus Keyphrase: GS66AZ compressor specifications R134a LBP freezing replacement commercial 220V

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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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Mbsmpro.com, Universal Electronic Defrost Timer Module, Refrigerator Control, 220-240V, 50/60Hz, 10A, Compressor Control, Defrost Cycle, Wiring Schematic, HVAC Repair

The Ultimate Guide to the Universal Electronic Defrost Timer Module: Engineering and Field Application

In the demanding world of professional refrigeration repair, adaptability is the hallmark of a master technician. When high-end electronic control boards fail and original replacements are obsolete or unavailable, the Universal Electronic Defrost Timer Module emerges as the definitive solution. This solid-state powerhouse is designed to bypass complex circuitry, providing a reliable, long-term fix for domestic and commercial cooling systems.

Technical Characteristics and Operating Principles

Unlike traditional mechanical timers that rely on a motorized gear train, this electronic module utilizes a microchip to manage timing cycles. This eliminates the risk of mechanical wear and “stuck” gears, which are the primary causes of evaporator freeze-ups.

Specification	Detail / Value
Input Voltage	220V – 240V AC
Frequency	50 / 60 Hz
Maximum Current (Compressor)	10 Amps (Inductive)
Maximum Current (Defrost)	5 Amps (Resistive)
Defrost Interval	Fixed 6 or 8 Hours (Model Dependent)
Defrost Duration	Fixed 20 to 25 Minutes
Housing	High-Insulation Heat-Shrink Polymer
Operating Temperature	-10°C to +55°C

Comparison: Mechanical vs. Electronic Defrost Timers

Understanding the shift from mechanical to electronic components is vital for modernizing older units.

Feature	Mechanical Timer	Electronic Module
Reliability	Prone to gear failure	High (No moving parts)
Noise Level	Audible clicking/humming	Completely silent
Accuracy	Varies with motor wear	Digital precision
Vibration Resistance	Low (Internal pins can shift)	High (Solid-state encapsulation)
Size	Bulky, requires mounting bracket	Compact, fits inside wire looms

Advanced Wiring Schematic for Technicians

To successfully integrate this module into a refrigerator, one must identify the primary power feeds and load lines. Below is the standard industrial wiring configuration for these four-wire universal modules:

• Line 1 (Phase): Usually connected to the Brown or Black wire.
• Neutral (N): Connected to the Blue wire.
• Compressor Output (Terminal 4 equivalent): Connected to the Red wire.
• Defrost Heater Output (Terminal 2 equivalent): Connected to the Orange wire.

Engineer’s Note: Always verify the color coding with a multimeter before final soldering, as some manufacturers may swap the Orange and Red functions depending on the production batch.

Installation Strategy and Field Advice

When performing a “board bypass,” the objective is to restore the basic cooling logic: Compressor Run -> Accumulated Time -> Defrost Cycle -> Repeat.

1. Thermal Protection: Ensure the defrost heater circuit remains in series with the original Bimetal Thermostat and Thermal Fuse. Never bypass safety components.
2. Placement: Although encapsulated, avoid placing the module in areas prone to direct moisture or heavy vibration from the compressor.
3. Connection Integrity: Use high-quality crimp connectors or solder with heat-shrink tubing to prevent oxidation in high-humidity environments.

Benefits of Using the Universal Electronic Module

• Versatility: Compatible with almost all non-inverter brands including LG, Samsung, Whirlpool, and Daewoo.
• Durability: The solid-state design handles voltage fluctuations better than traditional mechanical motors.
• Compact Design: Its slim profile allows it to be tucked away inside the compressor compartment or the rear wiring panel.

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Focus Keyphrase: Mbsmpro.com Universal Electronic Defrost Timer Module Wiring Schematic and Refrigerator Repair Guide for Technicians

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Excerpt: The Universal Electronic Defrost Timer Module is a critical component for modernizing refrigerator repairs. Designed to replace failing mechanical timers and expensive control boards, this solid-state device offers unmatched reliability. Featuring a 220V input and 10A capacity, it ensures precise timing for compressor operation and defrost cycles in various domestic refrigeration brands.

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