APC AFX Series Specifications download pdf (Page 19)

18

Troubleshooting

PROBLEM

Head pressure too high.

Head pressure too low.

Suction pressure too low.

POSSIBLE CAUSE

Condenser clogged or dirty.

Air or other non-condensable

gas in system

O.H.E. air intake blocked.

Overcharge of refrigerant.

Pump overloads tripped

(glycol system).

O.H.E. fans not operating.

Glycol head pressure

regulating valve not adjusted.

Glycol flow too low. Pump

cavitating, valve not open.

Glycol % higher than 40%.

Check water valve. Check

settings on condenser

ambient sensors. See

“System short of capacity”

above.

Flash gas in liquid refrigerant

line (bubbly sight glass).

Clogged drier strainer (feels

cold).

Obstructed expansion valve

(loss of capacity).

Loss of fluid within expansion

valve (erratic valve response)

Lack of refrigerant (bubbly

sight glass)

Dirty air filters/clogged filter

light on.

Clogged or icy coil.

CORRECTIVE ACTION

Clean condenser.

Evacuate system and

recharge. Install new drier

strainer.

Clean away debris.

Purge or remove excess from

high pressure side of system

Reset and check cause.

Check fuses and motor.

Replace as needed. Check

thermostat setting.

Adjust as needed to obtain

correct pressures.

Check glycol solution level

and concentration at pump.

Reduce glycol to maximum

40% concentration.

Correct as indicated.

Repair leak and recharge.

Replace with new drier

strainer.

Repair or replace valve.

Replace valve and feeler bulb

assembly.

Repair leak and recharge

system.

Clean as required.

Defrost and/or clean.

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