Comptek QD65H Compressor 1/6 HP R134a L/MBP Technical Specifications and Replacement Guide
Yes, your conclusion regarding the compressor ports is correct based on the standard design for this category:
Pipe 1 (single top pipe): This is the discharge line, usually the thinner pipe.
Pipe 2 (opposite the discharge): This is the suction line, which has a slightly larger diameter.
Pipe 3 (next to the suction): This is the process/service line, used for charging the gas.
Mbsmpro.com, Compressor, QD65H, 1/6 hp, Comptek, Cooling, R134a, 160 W, 1.2 A, 1Ph 220-240V 50Hz, L/MBP, RSIR, -35°C to -5°C, Cooling and Freezing
The refrigeration industry relies heavily on the “heart” of the system: the compressor. Among the most versatile and durable options available for domestic and light commercial applications is the Comptek QD65H. This piston-driven reciprocating compressor is engineered for reliability, specifically designed to handle the thermal demands of Low and Medium Back Pressure (L/MBP) environments.
Technical Specifications and Performance Data
The QD65H operates on the R134a refrigerant, a global standard for domestic cooling due to its thermodynamic efficiency and safety profile. Below is the comprehensive technical breakdown:
| Feature | Specification |
| Model | QD65H (HM Series) |
| Horsepower (HP) | 1/6 HP |
| Displacement | 6.5 $cm^3$ |
| Cooling Capacity (BTU/h) | 546 BTU/h |
| Cooling Wattage (-23.3°C) | 160 W |
| Motor Type | RSIR (Resistive Start – Induction Run) |
| Winding Material | High-grade Copper |
| Refrigerant Type | R134a |
| Power Supply | 220-240V / 50Hz (1 Phase) |
| Oil Type and Quantity | POE/Mineral (approx. 180ml – 200ml) |
| Current (Running) | 1.1 A – 1.2 A |
| LRA (Locked Rotor Amps) | 6.5 A |
| Cooling Method | Static (Natural cooling, no fan required for compressor) |
Efficiency Metrics (COP) and Performance Curve
Understanding the Coefficient of Performance (COP) is vital for energy management. The QD65H shows excellent stability across a wide range of evaporating temperatures.
| Evaporating Temp (°C) | Cooling Capacity (Watts) | Power Consumption (Watts) | COP (W/W) |
| -30 | 110 | 102 | 1.07 |
| -25 | 142 | 118 | 1.20 |
| -23.3 (Standard) | 160 | 125 | 1.28 |
| -20 | 185 | 134 | 1.38 |
| -15 | 230 | 148 | 1.55 |
| -10 | 285 | 162 | 1.76 |
| 0 | 410 | 190 | 2.15 |
Application and Capability
This compressor is the “workhorse” for medium-sized household appliances. It is ideally suited for:
- Capacity in Liters: Efficiently cools units between 180 to 250 Liters.
- Capacity in Cubic Feet: Approximately 6.3 to 8.8 $ft^3$.
- Appliance Types: Single-door refrigerators, small chest freezers, and water dispensers.
Comparison: QD65H vs. Similar Models
| Model | HP Rating | Displacement | Refrigerant | Application |
| Comptek QD65H | 1/6 HP | 6.5 $cm^3$ | R134a | L/MBP (Versatile) |
| ZMC GM70AZ | 1/5 HP | 7.0 $cm^3$ | R134a | LBP (Stronger Cooling) |
| Danfoss TLS6F | 1/6 HP | 5.7 $cm^3$ | R134a | LBP (High Efficiency) |
Professional Recommendations and Installation Notes
- Capillary Tube Selection: For R134a systems using the QD65H, a capillary tube of 0.031 inches (0.8mm) with a length of 3 meters is standard for LBP freezing applications.
- Vacuum Procedure: Always ensure a vacuum level of at least 500 microns to prevent moisture from reacting with the R134a oil.
- Thermal Protection: The QD65H features an internal or external protector. Ensure the relay (PTC type) is seated correctly to prevent winding burnout.
- Start Capacitor: While being an RSIR motor, in areas with unstable voltage, adding a 47-64µF start capacitor can assist in high-torque starts (HST).
Replacement Guide (Equivalents)
Same Refrigerant (R134a):
- Embraco: EMS 55HLC
- Danfoss/Secop: TLES6.5FT.3
- Huayi: HYE69MT
- Zanussi: GVY66AA
- Tecumseh: THB1355Y
Alternative Refrigerant (R600a/R12/Other):
Note: Requires system flush and oil check.
- QD65Y (R600a version)
- Embraco: EMX55CLC (R600a)
- Danfoss: TLES7.5KK.3 (R600a)
- GL60AA (R134a alternative)
- Zel: GQD65Y
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Excerpt: The Comptek QD65H is a high-performance 1/6 HP reciprocating compressor designed for R134a systems. Ideal for refrigerators between 180 and 250 liters, it offers a cooling capacity of 160W at -23.3°C. This professional guide covers its electrical characteristics, COP efficiency metrics, and provides a comprehensive list of equivalent models for seamless field replacement.
