Airedale DeltaChill FreeCool 110kW - 1080kW - Manual (Page 161)

Chillers DELTACHILL
™
Chillers
161
Installation, Commissioning and Maintenance Manual :7025232 12/ 2013
Troubleshooting
FAULT POSSIBLE CAUSE REMEDY / ACTION
Suction Pressure too low Flash gas (bubbles in sight glass) at liquid
line. Investigate for refrigerant leaks, repair and
re-charge system.
Clogged filter drier (pressure / temperature
drop across it). Replace drier cores
Condenser
Condenser fan not operating -
power on Power supply failure. Check power supply at circuit breaker.
Wiring to motors. Check voltage at motor terminals.
Motor / fan assembly jammed. Isolate unit and check free rotation of
motor/fan assembly. If faulty - replace.
Motor internal overheat protector tripped. Carry out continuity check at termin als “TK”
in motor terminal box.
If tripped and motor hot - check to see if the
motor bearings have seized/ fan difficult to
turn.
If tripped and motor cold - replace motor.
Faulty motor windings/capacitor. Motor humming would indicate fault in motor
or capacitor. Check windings for continuity
and if OK replace capacitor.
Minimum speed set too low. Adjust head pressure controller to suit.
Condenser fan runs too fast High ambient condition or excessive re-
circulation of air around condenser coil.
Check installation against design.
Minimum set speed setting incorrect. Adjust as necessary.
Incorrect pressure sensor setting. Adjust via microprocessor.
Faulty EC fan Replace fan
Faulty pressure sensor. Replace sensor.
Condenser fans runs only
slowly Incorrect pressure setting. Adjust via microprocessor.
Faulty EC fan. Replace fan.
Faulty Pressure sensor. Replace sensor.
Motor/capacitor faulty. Replace.
Motor wired incorrectly. Check against wiring diagram - correct as
required.