Servicing Mode; Test Run; Proper Pump Down Procedure; How To Adjust Water Flow Rate - Panasonic WH-MDC06E3E5 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.
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 When the unit is not in operation (standby), 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 30 litres minimum for
heating side and tank side respectively.
The default setting is p-c mode, SPEED 6. Please ensure the minimum flow rate is not less than 9L/min.
Depending on the hydraulic system pressure loss and type, the water flow rate can be adjusted by turning the red
knob on the water pump.
14.4

Expansion Vessel Pre Pressure Checking

Expansion Vessel with 6 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 150 L.
(Note: This amount of water is not include the tank unit volume)
If total amount of water is more than 150 L, 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 3 L)
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