Airedale BluCube 10-48kW - Manual (Page 68)

BluCube
™
Condensing Unit
68
Condensing Units
Installation and Maintenance Manual : 7222094 11/2013
Troubleshooting
FAULT POSSIBLE CAUSE REMEDY/ACTION
CRITICAL ALARMS:
Aux. Alarm Auxiliary Trip. Check operation of customer-added
alarm function.
Outdoor Fan Fault Fan Trip. Check and (if necessary) replace fan.
Coil Sensor Fault Faulty Sensor. Replace sensor.
No Cooling/Heating Compressor Protection Delay. Wait for a maximum of 10 minutes then
re-check.
Unit Will Not Start No power. Check power supply to the controller.
Wired incorrectly. Check wire connections in accordance with
wiring diagram on control box lid.
Loose wires. Check all wires, connections, terminals etc.
Compressor not operating No power to compressor. Check isolator, fuses, MCBs, contactor and
control circuit wiring.
Low pressure switch operated (if
fitted) (large or complete loss of
refrigerant charge). Repair leak and recharge system - if
completely out evacuate before charging.
Condenser fan thermal trip open
circuit. Investigate and correct.
Seized compressor. Replace compressor - investigate oil
trapping and general installation.
Defective compressor motor. Check winding resistances - replace
compressor. If burnt out follow burn out
procedure using suction line burn-out drier.
Noisy Compressor Expansion valve malfunction
(abnormally cold suction Iine). Ensure sensor is tight on suction and
superheat is correct (normally 5 to 6°C).
Replace power assembly or valve
as necessary.
Lack of oil. Repair leaks if any, add oil if required but not
too much. Investigate pipe system and
trapping. If no oil still, drain compressor and
measure in correct quantity.
Broken or damaged compressor valve
reed (compressor knocking). Replace compressor (possible other
symptom is that it will have high suction
pressure).
Worn or scored compressor bearing.
(excessive knocking). Replace compressor.
Head Pressure too high/HP cut-
out operated Condenser coil clogged or dirty. Clean condenser.
Overcharge of refrigerant. Normally
troublesome in warm weather. Remove excess refrigerant from system.
Air or other non-condensable gas
in system. Evacuate system and re-charge with new
refrigerant.
Head pressure controller faulty. Check fan speed controller - if
faulty - replace.
Fan not operating or operating
inefficiently. Check motor - if faulty - replace.
Head pressure too low Fan operating too fast in low
ambient conditions. Check fan speed controller adjustment - if
faulty - replace.