Troubleshooting
DuraSea Condenser Installation, Start-Up & Service Manual
22
L-3153
Compressor cycles on low-
pressure switch.
Indoor-Air Fan Running
1.
Liquid line solenoid valve(s) fails to open.
Check liquid line solenoid valve(s) for
proper operation. Replace if necessary.
2.
Filter drier plugged.
Replace filter drier.
3.
Expansion valve power head defective.
Replace power head.
4.
Low refrigerant charge.
Add charge. Check low-pressure switch setting.
Airflow Restricted
1.
Coil is iced.
Check refrigerant charge.
2.
Coil dirty.
Clean coil fins.
3.
Air filters dirty.
Clean or replace filters.
4.
Dampers closed.
Check damper operation and position.
Indoor-Air Fan Stopped
1.
Electrical connections loose.
Tighten all connections.
2.
Fan relay defective.
Replace relay.
3.
Motor overload open.
Power supply.
4.
Motor defective.
Replace motor.
5.
Fan belt broken or slipping.
Replace or tighten belt.
Compressor running but
cooling insufficient.
Suction Pressure Low
1.
Refrigerant charge low.
Add refrigerant.
2.
Head pressure low.
Check refrigerant charge. Check outdoor fan cycling control
operation.
3.
Air filters dirty.
Clean or replace filters.
4.
Expansion valve power head defective.
Replace power head.
5.
Indoor coil partially iced.
Check low-pressure setting.
6.
Indoor airflow restricted.
Remove obstruction.
Suction Pressure High
1.
Heat load excessive.
Check for open doors or windows in vicinity of fan coil.
Unit operates too long or
continuously.
1.
Low refrigerant charge.
Add refrigerant.
2.
Control contacts fused.
Replace control.
3.
Air in system.
Purge and evacuate system.
4.
Partially plugged expansion valve or filter drier.
Clean or replace.
System is noisy.
1.
Piping vibration.
Support piping as required.
2.
Compressor noisy.
Check mounts. Check tubing for rubbing. Replace compressor if
bearings are worn.
Compressor loses oil.
1.
Leak in system.
Repair leak.
2.
Crankcase heaters not energized during shutdown.
Check wiring and relays.
Check heater and replace if defective.
3.
Improper interconnecting piping design.
Check piping for oil return. Replace if
necessary.
Frosted suction line.
1.
Expansion valve admitting excess refrigerant.
Adjust expansion valve.
Hot liquid line.
1.
Shortage of refrigerant due to leak.
Repair leak and recharge.
2.
Expansion valve opens too wide.
Adjust expansion valve.
Frosted liquid line.
1.
Restricted filter drier.
Remove restriction or replace.
2.
Liquid line solenoid valve partially closed.
Replace valve.
Table 3: General Troubleshooting (continued)
PROBLEM
POSSIBLE REASON/SOLUTION
Summary of Contents for DuraSea DCA120D
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