Basic Troubleshooting - ATC G04 Series Installation, Operation & Service Manual

Applied Thermal Control Ltd
39 Hayhill Industrial Estate
Barrow-upon-Soar, Loughborough
LE12 8LD, United Kingdom
+44 (0) 1530 839 998
Service@thermalexchange.co.uk
Support@app-therm.com

6.0 BASIC TROUBLESHOOTING

# SYMPTOM
1 Compressor or
pump motor not
running.
Large condenser
fan is running,
and control
illuminated.
2 Noisy Operation
3 High fluid
pressure/low
flow rate
4 Fluid collecting or
leaking
5 Poor Cooling
Performance
Please contact ATC if you could not find the information you were looking for or still have an issue
Installation, Operation & Service Manual
CAUSES
Level switch may have been tripped – Fill the tank up again to resolve the
issue
High pressure switch may have been tripped:
a) Check fan spins freely and that condenser is clear of debris.
b) Assess whether the ambient temperature is too high.
c) Assess whether ventilation/air circulation is poor.
d) Assess whether surrounding equipment is generating hot air and
feeding it into the chiller air intakes.
If fitted, a low-pressure switch may have been tripped – this indicates
refrigerant loss. A multimeter is required to test this.
If running at a high setpoint, or if operating conditions have changed and
raised the fluid temperature, it is possible the compressor has turned itself on
high temperature internal protection.
Pump motor or fan motor bearings may have failed.
Pump head vane or seal may have failed.
In a 3-phase system, phase rotation may be incorrect.
Fluid lines may have become fouled through solid debris or biological growth.
Ensure biocides or pre-mixed biocidal process fluids are being used.
Ensure hoses are not transparent or translucent – UV light entering prompts
growth.
General fluid leak can lead to flow rate failure.
Excess fittings, too many sharp direction changes, too small a diameter hose
for flowrate or hoses too long at the wrong diameter.
Leaks are impossible to diagnose remotely, but usually you will see a pool of
fluid on a lower surface. Do not confuse this with condensation from cold
parts of the fridge.
Review the chemical compatibility of your fluid with the chiller. Contact ATC if
you are unsure.
Check if the fans are running.
Clean the condenser coil.
Excess thermal load applied.
Assess whether the ambient temperature is too high.
Assess whether ventilation/air circulation is poor.
Assess whether surrounding equipment is generating hot air and feeding it
into the chiller air intakes.
with the unit
G04/K04
AIRCOOLED CHILLER TROUBLESHOOTING
Rev 1 – 05/04/23