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When the function of the auxiliary electric heater is activated through the control panel, if the ambient
temperature is quite low and out of the nominal heating range, the control panel will tell "As ambient
temperature is low, startup is not allowed". At this point, the auxiliary electric heater will work, with the
running indicator lighting on, the water pump running but the compressor stopped.
When the function of the auxiliary electric heater is deactivated through the control panel, if the ambient
temperature is quite low and out of the nominal heating range, the control panel will tell "As ambient
temperature is low, startup is not allowed". At this point, the auxiliary electric heater will not work, with the
running indicator lighting off and both the water pump and compressor stopped.
When the unit is ready to perform heating but water temperature is below 20°C, in order to keep
stable and reliable operation, please do not start the terminal units until water temperature goes up to
35°C.
7.5 Maintenance to the main parts
(1) During normal operation, the water pump is under the control of the main unit. However, when
flushing the water system, do not let the main unit control the water pump.
(2) Do not start the unit until the water system has drained completely.
(3) Do not manually restart the unit until the stop interval exceeds 3 minutes.
7.6 Maintenance during long-term downtime
When the chiller is going to be stopped for a long period, maintenance listed below shall be performed:
(1) Take the leakage test for the refrigerant tube. If leakage occurs, eliminate it.
(2) Maintain the water pump and air conditioning divides in accordance with the suggestions provided
by the manufacturer.
(3) Drain the water system by opening the discharge valve (especially in winter) to avoid frostbite on
the shell and tube.
(4) Switch off the power supply of the chiller and the water pump.
(5) Clean and dry the inside and outside surface of the chiller. Then, cover it against dust.
7.7 Startup after long-term shutdown
Preparations shall be taken when starting up the chiller which has not been used for a long period.
(1) Completely check and clean up the chiller.
(2) Clean the water piping system.
(3) Check the water pump.
(4) Tighten all connectors.
(5) Take the leakage test for all piping. If leakage occurs, eliminate it.
(6) Regulate the water flow through the balance valve and check the water pressure.
(7) Check if the fan rotates properly.
(8) Check if the system vibration and noise are acceptable.
7.8 Parts replacement
Only parts supplied by Gree can be replaced instead of similar parts supplied by others.
A Series Inverter Modular Air-cooled Chiller (Heat Pump)
NOTE
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