Airedale BluCube 10-48kW - Manual (Page 69)

Condensing Units BluCube
™
Condensing Units
69
Installation and Maintenance Manual 7222094: 11/2013
Troubleshooting
FAULT POSSIBLE CAUSE REMEDY / ACTION
Compressor short cycles or
LP cut-out operated LP switch faulty (if fitted). Check cut out pressure and replace
if necessary.
Dirty indoor unit filters. Replace.
Dirty or icing evaporator (reduced airflow). Defrost and/or clean. Check gas charge and
expansion valve.
Lack of refrigerant (bubbles in sight glass
only as indication). Check for leaks - repair and
recharge system.
Clogged filter drier (pressure/temperature
drop across it). Replace.
Condenser fan running at full speed in
winter (full airflow). Check fan speed controller setting - if
faulty - replace.
Start up problems in very low ambients or
when long pipe runs are experienced. Check for low suction pressures on start-up
and fit a low ambient start kit if required, or
check operation of system if already fitted.
Suction Pressure too low Low evaporator airflow. 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.
Defrost cycle not initiating Unit set for cooling only. Check links.
Check unit configuration / defrost settings
Condenser fan not operating
- power on Power supply failure. Check power supply at circuit breaker.
Wiring to motor. 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 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.
Faulty pressure sensor. Check electrical connections are secure at
controller and pressure sensor. Replace
controller and sensor (as they are
matched sets).
Faulty Fan Speed Controller. Link wires “line” and “load” to bypass
controller. If motor runs full speed -
replace unit.