86
LEGEND
COMPRESSOR LOSES OIL
1. Leak in system. 1. Repair leak.
2. Crankcase heaters not energized during shutdown. 2. Check wiring and relays. Check heater and replace if defective.
FROSTED SUCTION LINE
Expansion valve admitting excess refrigerant. Adjust expansion valve.
HOT LIQUID LINE
1. Shortage of refrigerant due to leak. 1. Repair leak and recharge.
2. Expansion valve opens too wide. 2. Adjust expansion valve.
FROSTED LIQUID LINE
Restricted filter drier. Remove restriction or replace.
INDOOR FAN CONTACTOR OPEN
1. Power off. 1. Restore power.
2. Fuses blown in field power circuit. 2. After finding cause and correcting, replace with correct fuses.
3. No control power. 3. Check secondary fuses. Replace with correct type and size. Replace
transformer if primary windings are receiving power.
INDOOR FAN CONTACTOR CLOSED
1. VFD overload function tripped. 1. Refer to separate VFD technical manual for troubleshooting instructions.
2. Motor leads loose. 2. Check connections at motor lead junction box.
3. Motor windings open. 3. Check motor windings.
4. Single phasing. 4. Check for blown fuse. Check for loose connections at motor
junction box.
5. Belts broken or thrown. 5. Check belts. Replace as complete set if necessary.
6. Circuit breaker tripped. 6. Check for excessive current draw. Reset breaker. Replace if defective.
ASTP — Advanced Scroll Temperature Protection
VFD — Variable Frequency Drive
Table 78 — Cooling Service Analysis (cont)
PROBLEM SOLUTION
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