CIAT DYNACIAT power LG Manuel D'instructions page 47

Faults
- Air in the chilled water circuit.
- Chilled water flow insufficient.
Suction pressure
too low
- Chilled water flow rate sufficient but chilled water temperature too
low.
- Lack of refrigerant fluid.
- Air in the hot water circuit.
- Hot water flow rate insufficient.
- Cooling water flow rate sufficient but water temperature too high.
Excessive
discharge
pressure
- Tower or drycooler operating incorrectly.
- Condenser fouled or scaled.
- Too much refrigerant
Insufficient oil
- Oil not topped up after servicing
- Water flow is either stopped or below the minimum rate.
Water flow fault
- Start-ups too close together; short-cycle protection disrupted.
Motor winding - Overload protection disrupted or defective.
fault
- Power supply voltage too low.
a) With above-normal low pressure
- Controller setpoint incorrect
- Heat load above unit capacity.
- Water flow rate too high
Fluid outlet
temperature too
high - Electronic control faulty.
b) With below-normal low pressure
- Lack of refrigerant
- Incorrect refrigerant supply to evaporator
Discharge
temperature
insufficient - The compressor draws in too much liquid
and close to
condensing
temperature
Moisture indicator - The sight glass remains yellow: Excessive moisture in the circuit.
sight glass
Probable causes
EN - 21
Instructions
- Purge the chilled water circuit.
- Check the opening of the chilled water circuit valves.
- Check the direction of rotation of the pump, that there is no cavitation
and that the pump is not too small.
- Recalculate the heat load and check that the unit is not too powerful
for this load.
- Check the operation of the regulator.
- Trace the leak(s) and top up the charge.
- Drain the hot water circuit.
- Check the opening of the hot water circuit valves.
- Check the direction of rotation of the pump, that there is no cavitation
and that the pump is not too small.
- Recalculate the heat load and check that the unit is not too powerful
for this load.
- Check correct operation of the regulator and setpoint adjustment.
- Check the operation of the tower or drycooler
- Check the cooling water temperature control.
- Clean the condenser tubes.
- Check and adjust the load.
- Top up with oil.
- Check that the valves on the water circuit open and check the
pump(s).
- Set the correct time between two starts.
- Adjust or replace the overload protection.
- Check the electrical wiring; if need be, contact your electricity supplier
- Correct the setpoint value
Two solutions:
- Adjust the water flow rate to the specified value using the control
valve.
- Bypass the evaporator to obtain a greater difference in temperature
with a lower flow rate to the evaporator.
- Check the operation of the temperature and power controllers
- Look for leaks and top up the load.
- Check the expansion valve.
- Ensure that the dehumidifier filter is not clogged and that the
evaporator is not frozen
- Check and adjust the refrigerant load
- Check the expansion valve
- Refer to section 12 "Main components of the refrigerating circuit".
EN