Servicing Guide; How To Take Out Front Plate; Test Run; Expansion Vessel Pre Pressure Checking - Panasonic WH-UD05JE5 Service Manual

17. Servicing Guide

17.1 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.

17.2 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
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 Magnetic Water Filter Set. Reinstall it after finish cleaning.

17.3 Expansion Vessel Pre Pressure Checking

For Space Heating / Cooling

Expansion Vessel with 10 L air capacity and initial pressure of 1 bar is installed in this Tank Unit.

Total amount of water in system should be below 200 L.
(Inner volume of Tank Unit's piping is about 5 L)

If total amount of water is over 200 L, please add another expansion vessel. (field supply)

Please keep the installation height difference of system water circuit within 10 m.

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
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.
172
CAUTION
Open or close the Front Plate carefully.
The heavy Bottom Front Plate may injures
the fingers.
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