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Desert Aire - LC/LV Manual
4.4
Head Pressure is Too High
POSSIBLE CAUSE
Insufficient system airflow
Excessive refrigerant charge
Non-condensables in system
Defective refrigeration valves
Restriction in refrigeration piping
Refrigeration system is overloaded
Low water flow
Lack of airflow
Remote condenser fan troubleshooting
1) Faulty Contactor
2) Fan cycling on internal protection
3) Remote condenser jumper missing
at dehumidifier
4) Pressure control inactive
Service valves closed or not fully open
Excessive pressure drop in line sets
REMEDY
1) Evaluate system airflow
2) Check for dirty filters or restricted
ductwork.
3) Verify that coils are clean.
Re-evaluate system charge.
Evaluate or purge system.
Check 3-way, flooding, solenoid and
check valves for sticking.
1) Check coil and tubing for kinks.
2) Replace dirty drier filter.
1) Reduce entering air temperature or
relative humidity.
2) Check register locations for short
cycling of air.
Evaluate water flow rate for your
application.
Assure coil is clean and no airflow
restrictions exist around unit
1) Replace contactor.
2) Verify motor voltage & ensure free
spinning motor shaft.
3) Add necessary jumper in
dehumidifier.
4) Verify pressure control cut-in and
differential settings.
Fully open service valves.
Re-evaluate remote condenser
installation
REMOTE CONDENSER PROBLEMS WHICH CAUSE EXCESSIVE PRESSURES
Summary of Contents for ExpertAire LC Series
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