Servicing Mode; Test Run; Proper Pump Down Procedure; How To Adjust Water Flow Rate - Panasonic WH-MXF09D3E8 Service Manual

14. Servicing Mode

14.1 Test Run

1. Fill up the Tank Unit with water. For details refer to Tank Unit installation instruction and operation instruction.
2. Antifreeze agent must be added into water circuit to prevent freezing of water when outdoor ambient
temperatures is low. Recommended antifreeze:
Propylene glycol: 40% (equivalent to -20°C)
3. Set ON to the Mono bloc unit and RCCB. Then, for remote control operation please refers to (Mono bloc) Air-
to-Water Heatpump's operation instruction.
4. For normal operation, pressure gauge reading should be in between 0.05 MPa and 0.3 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.
5. After test run, please clean the external filter. Reinstall it after finish cleaning.

14.2 Proper Pump Down Procedure

Strictly follow the steps below for proper pump down procedure. Explosion may occur if the steps are not
followed as per sequence.
1 Press the "SERVICE" switch on remote control to enter SERVICE mode. Operate the system in Sr : 01 mode
for pump down operation.
2 After 10~15 minutes, (after 1 or 2 minutes in case very low ambient temperatures (< 10°C)), fully close 2 way
valve.
3 After 3 minutes, fully close 3 way valve.
4 Press the "OFF/ON" switch on remote control to stop pump down operation.
5 Remove the refrigerant piping.

14.3 How To Adjust Water Flow Rate

Before adjust the water flow rate, make sure that the total water volume in the installation is 50 litres minimum.
The water flow rate can be adjusted with select the water pump speed on the water pump. The default setting is
medium speed (II). However, please ensure the minimum flow rate cannot be less than 18L/min.
Adjust it to high speed (III) or slow speed (I) if necessary (e.g. reduce the noise of running water).
Graph 5.1 shown the external static pressure (kPa) versus water flow rate (L/min).
Flow rate characteristic of Mono bloc unit is as per above mentioned.

14.4 Expansion Vessel Pre Pressure Checking

Expansion Vessel with 10 L air capacity and initial pressure of 1 bar is installed in this Mono bloc unit.
Total amount of water in system should be below 200 L.
(Note: This amount of water is not include the tank unit volume)
If total amount of water is more than 200L, please install additional expansion vessel (field supply).
Please keep the installation height difference of system water circuit within 10 m.
(Inner volume of same Mono bloc unit is about 5 L)
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