ULTIMA COMPACT
Condensing Units
34
Condensers & Condensing Units
Installation & Maintenance : 6259675 IM V1.9.0 04/2016
Troubleshooting
FAULT
POSSIBLE CAUSE
REMEDY / ACTION
Suction Pressure too low
Low evaporator airflow (not Airedale Unit). Check fan motors, belts and drives.
Flash gas (bubbles in sight glass) at
expansion valve.
Investigate for refrigerant leaks, repair and
re-charge system.
Clogged filter drier (pressure / temperature
drop across it).
Replace.
Obstruction in liquid line solenoid valve.
Inspect, clean or replace.
Obstruction in expansion valve.
Inspect, clean or replace.
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 o
ut continuity check at terminals “TK”
in motor terminal box. If tripped and motor
hot - check bearings. 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 Fan Speed Controller.
Replace controller and sensor (as they are
matched sets).
Faulty pressure sensor.
Replace sensor.
Condenser fans runs only
slowly
Incorrect pressure setting.
Adjust via microprocessor.
Faulty Controller.
Replace controller and sensor (as they are
matched sets).
Faulty Pressure sensor.
Replace sensor.
Motor/capacitor faulty.
Replace.
Motor wired incorrectly.
Check against wiring diagram - correct as
required.
