Copland D6SH Compressor Troubleshooting R22 | Noise, Trip & Low Current | Causes, & Fix | HVAC

Описание: Learn step-by-step how to troubleshoot Copeland D6SH-3500 compressors using R22 refrigerant in chillers and package AC units. This video explains every symptom — metallic noise, short-time tripping, low current, and oil foaming — and shows how to fix them. Covers refrigerant charge correction, reverse rotation, valve blockage, electrical imbalance, and internal mechanical faults. Includes startup checklist, oil inspection, suction/discharge readings, and preventive maintenance tips. Designed for HVAC engineers, service technicians, and O&M professionals working with medium-temperature R22 systems.

📘 Full Description – Issues & Solutions (R22 System)

Main Issues Observed
1. Loud metallic sound caused by reverse rotation or internal wear.
2. Compressor trips within seconds due to low R22 charge, closed valves, or single phasing.
3. Low current below 55 amps indicates suction starvation or gas restriction.
4. Foamy or dark oil means refrigerant mixing with oil or bearing damage.


Step-by-Step R22 Solutions
✅ Check suction pressure: Maintain 60–70 psi for R22 at normal load. Add refrigerant slowly until pressure stabilizes.
🔄 Verify phase rotation: Swap any two power leads to correct reverse rotation.
🚿 Ensure valves are open and filter-drier is clean to allow full gas flow.
🔥 Preheat compressor oil: Keep crankcase heater ON for 8–10 hours before startup.
🧴 Inspect oil clarity: Replace if dark and always use Suniso 3GS oil for R22 systems.
⚡ Check current balance: Keep phase current within ±5% difference.
🧰 If problem persists, send compressor to rewinding workshop for internal mechanical inspection.

Preventive Maintenance Tips for R22 Compressors
• Replace oil after any contamination or burnout.
• Keep R22 refrigerant charge correct to avoid suction starvation.
• Energize crankcase heater overnight before every startup.
• Record suction and discharge pressures, current, and oil condition weekly.
• Tighten electrical terminals regularly to prevent arcing or unbalanced load.

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