Panasonic WH-UD28AE, Service Manual

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14 Servicing Mode
14.1. Test Run
1. Fill up the boiler tank with water. For details refer to boiler tanks installation instruction and operation instruction.
2. Set ON to the indoor unit and RCCB. Then, for control panel’s operation please refers to air-to-water heatpump’s operation
instruction.
3. For normal heat exchanger operation, pressure gauge reading should be in between 0.05 MPa and 0.2 MPa.
If necessary, adjust the water pump speed accordingly to obtain normal water pressure operating range. If adjust water pump
speed cannot solve the problem, contact your local authorized dealer.
14.2. Proper Pump Down Procedure
1. Press the “PUMPDW” button on control panel to begin PUMP DOWN mode. Operate the system in PUMP DOWN mode for
10 ~ 15 minutes.
2. After 10 ~ 15 minutes, (after 1 or 2 minutes in case very low ambient temperatures (< 10
°
C)), close 2 way valve.
3. After 3 minutes, close 3 way valve and press the “OFF/ON” button on control panel to stop PUMP DOWN mode.
14.3. How To Adjust Water Flow Rate
• The water flow rate can be adjusted with select the water pump speed on the water pump. The default setting is high speed (III).
Adjust it to moderate speed (II) and slow speed (I) if necessary (e.g. reduce the noise of running water).
Below graph shown the external static pressure (mH
2
O) versus water flow rate (l/min).