APC AFX Series Specifications download pdf (Page 17)

16

Troubleshooting

PROBLEM

Controls erratic or inoperative

Evaporator coil ices

Blower fails to start

Compressor fails to start.

POSSIBLE CAUSE

Wiring improperly connected

or broken.

Usually caused by lack of

proper quantity of airflow

across coil.

Low return air temperature.

Low refrigerant.

Power failure.

Control circuit fuse blown.

Defective contactor.

Overload tripped.

Controller alarm.

Setpoint too high.

Complete loss of refrigerant

charge.

Head pressure too high (high

pressure switch open).

Liquid line solenoid not

opening.

Controller alarm.

CORRECTIVE ACTION

Check wiring connections at

schematic.

Check filters; clean if

necessary.

Check for obstruction of

airflow in duct system. Unit is

designed for ½” s.p. (ext.)

W.P. approximate.

Ensure correct rotation of

evaporator blowers.

Check return air temperature

setpoint.

Check DX system for correct

operation/leaks.

Check power source and

input cable.

Replace fuse.

Repair or replace.

Reset and check cause.

Clear alarm(s).

None required. Adjust to

desired temperature. Check

compressor electrical circuit

for shorts or loss of phase.

Repair leak and recharge

system.

Check condenser for

obstructions. Manually reset

switch.

Check for 24 VAC to solenoid

coil. If not, check wiring. If 24

VAC is at solenoid, solenoid

coil may be bad, or is stuck.

Replace or repair as

necessary.

Clear alarms.

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