Servicing Guide; How To Take Out Front Plate; Test Run; Expansion Vessel Pre Pressure Checking - Panasonic WH-ADC0309H3E Service Manual

15. Servicing Guide

15.1 How to take out Front Plate

Open and Close Front Plate
1 Remove the 2 mounting screws of Bottom
Front Plate.
2 Slide it upwards to unhook the Bottom Front
Plate hook.
3 Reverse above steps 1~2 for close it.

15.2 Test Run

1 Before test run, make sure below items have been checked:-
Pipework are properly done.
o
Electric cable connecting work are properly done.
o
Tank Unit is filled up with water and trapped air is released.
o
Please turn on the power supply after filling the tank until full.
o
In order to check whether the tank is full, switch heater once for about 10 min.
o
2 Switch ON the power supply of the Tank Unit. Set the Tank Unit RCCB/ELCB to "ON" condition. Then,
please refer to the Operation Instruction for operation of Remote Controller.
3 For normal operation, Water 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.
4 After test run, please clean the Water Filter Set. Reinstall it after finish cleaning.

15.3 Expansion Vessel Pre Pressure Checking

[Lower limit water volume of the system]
Please ensure the capacity of the circulating water of the total system including the capacity of the indoor unit is more
than 30 L.
If the water capacity is insufficient, during deice operation, the water temperature is lowered and the water will freeze
in the system's component leading to product failure.
[Upper limit water volume of the system]
The indoor unit has a build-in Expansion Vessel with 10 L air capacity and initial pressure of 1 bar.
Total amount of water in the system should be below 200 L. If the total amount of water is more than 200 L, please
add expansion vessel (field supply). The expansion vessel capacity required for the system can be calculated from
the formula below.
V =
1 -
V : Required gas volume
<expansion vessel volume L>
V : System total water volume <L>
O
Ɛ : Water expansion rate 5 → 60˚C = 0.0171
P : Expansion tank filling pressure = (100) kPa
1
P : System maximum pressure = 300 kPa
2
- ( ) Please confirm at actual place
- The gas volume of the sealed type expansion
vessel is presented by <V>.
• It's advised to add 10% margin for required gas
volume of calculation.
×
Ɛ Vo
98 +
P
1
98 +
P
2
Hook
Open or close the Front Plate carefully.
The heavy Bottom Front Plate may injures
the fingers.
2X (screw)
Water expansion rate table
Water temperature (°C)
10
20
30
40
50
60
70
80
90
[Adjustment of the initial pressure of the expansion
vessel when there is a difference in installation height]
If the height difference between the indoor unit and
the highest point of the system water circuit (H) is
more than 7m, please adjust the initial pressure of the
expansion vessel (Pg) according to the following
formula.
133
CAUTION
Water expansion rate Ɛ
0.0003
0.0019
0.0044
0.0078
0.0121
0.0171
0.0228
0.0291
0.0360
Pg= (H*10+30) kPa