Servicing Mode; Test Run; How To Adjust Water Flow Rate; Expansion Vessel Pre Pressure Checking - Panasonic WH-MDC05F3E5 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 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. The default setting is SPEED 2. Please ensure the minimum flow rate is not less
than 9 l/min and not more than 35 l/min.

The available external static pressure (kPa) in function of the water flow rate (l/min) is shown in the P-Q
graph.

Depend on the hydraulic system pressure loss and type, the water flow rate can be adjusted by remote
control.
1. When the Air-to-Water Heatpump is in stop operation, press SERVICE button for 5 seconds.
2. Press ▲/▼ button to select menu S02 (PUMP SPEED ADJUST MODE) and press SET button to confirm the
menu.
3. Press SELECT button then press ▲/▼ button to change pump speed and press SET button to confirm the
pump speed.
4. Press OFF/ON button to exit PUMP SPEED ADJUST MODE.

During PUMP SPEED ADJUST MODE, we can select AIR PURGE function by pressing FORCE button.

In AIR PURGE function, the pump will operate ON and OFF for 10 minutes to purge the air in the hydraulic
system.

Press again the FORCE button to exit AIR PURGE function. PUMP SPEED ADJUST MODE will stop
operation.

14.3 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)
P-Q Graph
120
110
100
7
90
6
5
80
70
4
60
3
50
2
40
1
30
20
10
0
0 5 10 15 20
WATER FLOW RATE (I/min)
80
25 30 35 40