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Short term break
Heat source is not in operation daily or up to a week.
(1) Press the RUN/STOP button on the module controller to stop the chiller units operation.
(2) When external water pumps are used and are controlled by group input / output signals, the water
pump will begin its stopping process automatically
Note
(For water pumps not using group input /
output signals, ensure the stopping procedure is performed
Note
).
When the chiller has a built in inverter driven water pump, the water pump will begin its stopping
process automatically.
Note
(3) The power supply to the chiller should never be turned off. The crankcase heater control for the
heating of refrigerant oil and freeze protection control for the water pump are still active, even when
the chiller is in the stop condition.
In the case of a system using an external pump and set up for group operation, ensure the water
pumps power supply is never turned off, as the freeze protection control is still active when in its
stop condition.
(4) To reduce the risk of the water pipework freezing, the adding of antifreeze chemicals are permitted
or the operation of the water pump should be performed. The antifreeze chemicals used should be
in accordance to European standards and cautions should be taken ensure the plate heat
exchanger or pipework will not corrode.
Note) Time of the stopping operation changes in accordance to the low pressure control for each
circuit (15 seconds is the minimum).
Long term break
Heat source is not in operation for a week or more.
(1) Press the RUN/STOP button on the module controller to stop the chiller units operation.
(2) When external water pumps are used and are controlled by group input / output signals, the water
pump will begin its stopping process automatically
Note
(For water pumps not using group input /
output signals, ensure the stopping procedure is performed
Note
).
When the chiller has a built in inverter driven water pump, the water pump will begin its stopping
process automatically.
Note
(3) On completion of the pump succeeding operation
Note)
, turn off the power supply of the heat pump
and external water pump. (Also turn off the heat pump for energy saving since the crankcase
heater remains powered on.)
(4) Once the chiller has completed the stop operation
Note
, the power supply to the chiller should be
turned of. If applicable, the external water pump(s) power supply should also be turned off.
Note) Time of the stopping operation changes in accordance to the low pressure control for each
circuit (15 seconds is the minimum).
Notes on starting after long-term stop of operation
(1) The power supply to the chiller needs to be turned on for at least 12 hours prior to operating the
chiller, this is to ensure the crankcase heater warms the refrigerant oil. Failure to warm the
refrigerant oil could cause an irregular start up and damage the compressor.
If the chiller is required to stop each day, the RUN/STOP button should be pressed with the power
supply kept on.
(2) On completion of the 12 hours refrigerant warming, the "Test Run" procedure should be carried out
to begin operation.
Precautions When Operation Is Stopped
Before the long-term operation stop, either drain water in the water piping or replace anti-freeze.
Leaving water inside the piping or mechanism creates the risk of damage to the equipment should
freezing of the water occur during winter.
Note
