309 B/C – 03/03 A – page
25/28
McQuay designers have given full consideration to make servicing convenient during unit development. After opening
service panel, both servicing and maintenance can be easily carried out.
Under normal environment, the only work needed is checking the return air way and cleaning the heat exchange surface
regularly at month or season interval decided on operating condition.
If the surrounding is very dirty or oily, for maintaining superior performance and sufficient capacity, please ask
specialized personnel to do regular cleaning of heat exchanger.
Maintenance
For keeping consistent performance and durability with safe, effective and long-life operation, always conduct proper and
regular maintenance to the unit.
For long period of operation time, the heat exchanger will become dirty impairing its effectiveness and reducing the
performance of the air conditioner. Consult your local dealer on the cleaning of the heat exchanger.
No main maintenance or servicing needed for the internal water circuit except the water pump failure. It is advised that
regular check on the strainer should be conducted and replace the water strainer if the strainer is dirty or clogged.
Always check the water level in the system, for the target of protecting the moving components in the hydraulic kit from
overheating, excessive wearing and water freeze.
All the chilled water in the hydraulic system must be drained out completely during unit shutdown in winter, to avoid water
piping damage due to freeze.
Troubleshooting
Symptoms
Possible Causes
Remedial Action
No power supply.
Check power supply.
Fuses blown or automatic
Look for short circuit or
circuit breakdown open.
grounded wires in motor
windings. Replace fuses
and reset circuit breakers
when the fault has been
corrected. Check tightness
and soundness of all
electrical connections.
Unit is stopped because a
Determine the type of
safety has tripped.
safety shut down and
correct the default before
the unit is restarted.
Loose wires.
Check wire connections and
tighten terminal screws.
1. Compressor does no t start
·
Compressor faulty.
Contact local dealer.
2. Fan does not work
No power supply.
Check power supply.
Fan motor faulty.
Contact local dealer.
3. Air conditioner does work,
Thermostat setting too high.
Reset thermostat
but
insufficient cooling.
Condenser coil dirty.
Contact local dealer.
Obstacle blocking air inlet or
Remove the obstacle.
outlet of the unit.
Insufficient refrigerant in the
Contact local dealer.
system.
·
mproper water flow rate.
Contact local dealer.
Water in the system is
Contact local dealer.
contaminated.