Original Copeland Refrigerator Scroll Compressor VR144KS-TFP VR160KS-TFP VR190KS-TFP

• Office and public buildings: small to medium-sized office buildings, conference rooms, schools, and specific floors in hospitals.

• High-end residential properties: large open-plan apartments, detached/townhouse villas, and whole-home comfort heating and cooling systems for luxury apartments.

How to determine whether the compressor needs to be replaced or repaired? What are the specific testing indicators?

1. Visual Inspection

• Oil Leakage: Check the compressor housing and connecting pipes for obvious oil stains, which may indicate refrigerant leakage or seal failure.

• Housing Damage: Inspect the housing for cracks, deformation, or loose connections.

• Frost Formation: Frost on the return pipe only is normal; frost on the cylinder wall or body may indicate liquid slugging risk.

2. Sound Inspection

• Normal Sounds: Regular suction and discharge sounds without abnormal noise.

• Abnormal Sounds: Knocking, rattling, scraping, or sharp friction sounds may indicate internal component wear or looseness.

3. Vibration Inspection

• Abnormal vibration during operation may indicate internal component issues.

• Excessive vibration may be due to loose anchor bolts, unstable foundation, or bearing damage.

1. Pressure Parameters (Key Indicators)

• High-Side Pressure: Normal range: 1.3–1.7 MPa. Below 1.3 MPa may indicate reduced compression capacity; above 1.7 MPa may indicate system blockage.

• Low-Side Pressure: Normal range: 0.15–0.25 MPa. Abnormal values indicate system failure.

• Oil Pressure: Should be 0.1–0.4 MPa higher than discharge pressure; standard range: 0.2–0.3 MPa.

2. Temperature Parameters

• Discharge Temperature: Single-stage compressor: 50–90°C; two-stage high-pressure stage: 80–120°C; maximum should not exceed 150°C.

• Suction Temperature: Should be 5–15°C higher than the evaporation temperature.

• Oil Temperature: Normal range: 35–60°C; maximum should not exceed 70°C.

• Bearing Temperature: Main bearing temperature: 35–60°C; should not exceed ambient temperature by 30°C.

3. Oil Level Inspection

• Single Sight Glass: Oil level between 1/3 and 2/3 of the sight glass.

• Double Sight Glass: Oil level between 1/2 of the upper sight glass and 2/3 of the lower sight glass.

1. Winding Resistance Measurement

• Use a multimeter on the R×1 scale to measure motor winding resistance.

• Three-Phase Motor: Measure resistance between any two of the three terminals; all three readings should be consistent.

• Single-Phase Motor: Measure resistance between C-R, C-S, and R-S; the R-S value should equal the sum of C-R and C-S.

2. Insulation Resistance Inspection

• Use a 500V megohmmeter to measure the winding-to-ground resistance; it should be greater than 1 MΩ.

• A reading below 1 MΩ may indicate a short circuit or insulation aging.

3. Operating Current Inspection

• Use an ammeter to measure the motor current. Abnormally high current may indicate component wear or failure.

• For variable-frequency compressors, pay special attention to electronic control system failures.

1. Suction/Discharge Capacity Inspection

• Use a finger to block the exhaust port; clear pressure should be felt, and a "hissing" exhaust sound should be heard when released.

• If no pressure is felt and no exhaust sound is heard, the compressor performance is likely poor.

2. Seizure Judgment

• The compressor does not operate after power is applied, and the protector trips.

• Possible causes: oil starvation, foreign material ingress, or mechanical failure.

3. Valve Plate Inspection

• Damaged valve plates can reduce suction/discharge capacity, preventing the system from achieving normal pressure.

• Minor short circuits or open circuits in the windings that can be repaired.

• Seizure can be attempted to resolve via tapping, capacitor start, or high-voltage start methods.

• Wear of seals, bearings, and other consumable parts that can be replaced.

• System blockage or oil degradation that can be cleaned or replaced.

• Severe motor winding burnout (ground or phase-to-phase short circuit).

• Severe internal wear or shattered scroll components.

• Irreparable valve plate fractures.

• Frequent failures after multiple repairs.

• Service life exceeds the design lifespan (typically 10–15 years).