Airedale TurboChill FreeCool 200kW - 1830kW - Manual (Page 132)

132 Chiller Technical Manual 7525355 V1.1.0_04_2013
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Chillers TurboChill™ Air Cooled and FreeCool
Troubleshooting
Fault Possible Cause Remedy / Action
General
Unit will not start
No power. Check power supply to the controller.
Wired incorrectly.
Check wire connections in accordance
with wiring diagram.
Loose wires. Check all wires, connections, terminals etc.
Remote on/off.
Check that the remote on/ off
is at the on position.
Refrigeration
Compressor not
operating
No power to compressor.
Check isolator, fuses, MCBs, contactor
and control circuit wiring.
Low pressure cut-out operated (large
or complete loss of refrigerant charge).
Recover refrigerant, repair, pressure
test, evacuate and recharge system.
Compressor showing
fault on controller.
Determine fault, refer to alarm
codes for further information.
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 using
correct refrigerant handling techniques.
Air or other non-condensable
gas in system.
Evacuate system and re-charge
with new refrigerant.
Head pressure controller faulty. Check EC fan control module - 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 EC fan control module - if faulty - replace.
Suction pressure
too low
Flash gas (bubbles in sight
glass) at liquid line.
Investigate for refrigerant leaks, repair, pressure
test, evacuate 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 terminals
“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.