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12.2.4 Water Pump Speed Feedback Error
Basically pump speed feedback is control by micon.
When pump speed is below low limit or over high limit for a few seconds, micon detect pump error and
system is stopped.
Error detection conditions:
Current pump speed < 1000 rpm or
Current pump speed > 6000rpm for 10 seconds.
Control contents:
When error occurs, water pump, heating and heater is stopped for 30 seconds then restart again (Retry
control).
When micon detect error again, system is stopped and error code [H20] is displayed at control panel.
12.2.5 Water Pump Only Operation
Purpose
Circulate and fill the piping with water during installation time
Water pump only circulation can be set from the control panel SERVICE S/W when the operation is in
Standby Mode.
Press the SERVICE S/W for continuous 5 sec to enter Service Mode.
In Service Mode, select SR: 02 and press SET S/W to start water pump only operation.
3 way valve turn OFF and 2 way valve turn ON.
Water pump will stop operation when H62 is triggered.
Press the OFF/ON button to stop the water pump only operation.
12.3 Pump Down Operation [Service Mode: 01]
Purpose
Ensure the pump down operation when relocating or disposing of the unit. The pump down operation will extract all
refrigerant from the piping into the outdoor unit.
Controls:
1 Press the SERVICE S/W for continuous 5 seconds to enter Service Mode.
2 In service mode, select Sr: 01 and press SET S/W to start Pump Down operation.
3 There will be no low pressure error and freeze prevention judgement during Pump Down operation.
4 3 ways valve will shift to room side and 2 ways valve will turn ON.
5 Press OFF/ON button to stop the unit.
12.4 Flow Switch
12.4.1 Flow Switch Control
1 The water flow switch serves as an overload protector that shuts down the unit when the water level is
detected to be low.
2 Detection is Lo (0 V) when there is no water flow, and detection is Hi (5 V) when there is water flow.
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