43
A Series Inverter Modular Air-cooled Chiller (Heat Pump)
The recovery equipment shall be in good working order with a set of instructions concerning the
equipment that is at hand and shall be suitable for the recovery of ammable refrigerants. In addition, a
set of calibrated weighing scales shall be available and in good working order. Hoses shall be complete
with leak-free disconnect couplings and in good condition. Before using the recovery machine, check
that it is in satisfactory working order, has been properly maintained and that any associated electrical
components are sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in
doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder,
and the relevant Waste Transfer Note arranged. Do not mix refrigerants in recovery units and especially
not in cylinders.
If compressors or compressor oils are to be removed, ensure that they have been evacuated to an
acceptable level to make certain that flammable refrigerant does not remain within the lubricant. The
evacuation process shall be carried out prior to returning the compressor to the suppliers. Only electric
heating to the compressor body shall be employed to accelerate this process. When oil is drained from a
system, it shall be carried out safely.
8 Troubleshooting and after-sales service
8.1 Troubleshooting measures
Symptoms Probable causes Recommended action
Shutdown against high
pressure protection of
the compressor
1. Incomplete vacuuming.
2. Too high environment temperature.
3. Condenser ns are dirty and there
are blockages.
4. Inadequate condensing air ow and
the condenser fan failed.
5. Failed high pressure cuto.
6. Overcharged refrigerant.
1. Re-vacuum the system and
recharge refrigerant.
2. Improve ventilation.
3. Clean condenser ns.
4. Repair the condenser fan.
5. Check the high pressure
switch.
6. Check the refrigerant charge
and discharge some refrigerant.
Shutdown against
overloading of the
compressor motor
1. The voltage is too high or too low.
2. The discharge pressure is too high
or too low.
3. The return water temperature is too
high.
4. The overloaded element is faulty.
5. The environment temperature is too
high.
6. There is phase loss for the
compressor.
7. The compressor motor is short-
circuited.
1. Check if the voltage is or no
less than 80% and the phase
dierence does not exceed
±30%.
2. Check discharge pressure
and nd out causes.
3. Check return water
temperature and nd out
causes.
4. Check the compressor
current.
5. Improve ventilation.
6. Check the three phase
resistances.
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