Check Water Pressure; Check Pressure Relief Valve; Expansion Vessel Pre Pressure Checking - Panasonic WH-MDC05H3E5 Service Manual

11.1.7 Charging the Water

Make sure all the piping installations are properly
done before carry out below steps.
1 Take out the Cover by removing the 2
mounting screws to access to the Pressure
Relief Valve and Air Purge Valve.
2 Turn the plug on the Air Purge Valve outlet
anticlockwise by one complete turn from fully
closed position.
Air purge valve b
3 Set the Pressure Relief Valve level "DOWN".
Pressure relief
valve a
Lever
Turn down
Pressure relief valve a
4 Start filling water (with pressure more than
0.1 MPa (1 bar)) to the Mono bloc unit via
water inlet. Stop filling water if the free water
flow through Pressure Relief Valve drain hose.
5 Turn ON the power supply and make sure
Water Pump is running.
6 Check and make sure no water leaking at the
tube connecting points.
7 Reinstall the Cover by tightening the 2
mounting screws.
11.1.8 Reconfirmation
Be sure to switch off all power supply before performing each of
the below checkings. Before obtaining access to terminals, all
supply circuits must be disconnected.
Cover g
Mounting
screws
Plug (turn
anticlockwise by
one complete
turn)
Pressure
relief valve a
Lever
or
Turn down
Pressure relief valve a
WARNING
11.1.8.1

Check Water Pressure

= 1 bar)
Water pressure should not lower than 0.05 MPa (with
inspects the Water Pressure Gauge). If necessary add
tap water into the water circuit.
11.1.8.2

Check Pressure Relief Valve


Check for correct operation of Pressure Relief
Valve by turning on the lever to become horizontal.

If you do not hear a clacking sound (due to water
drainage), contact your local authorized dealer.

Push down the lever after finish checking.

In case the water keeps drained out from the unit,
switch off the system, and then contact your local
authorized dealer.
11.1.8.3 Expansion Vessel Pre Pressure
Checking
[Upper limit water volume of the system]
The Mono bloc unit has a build-in Expansion Vessel
with 6 L air capacity and initial pressure of 1 bar.

Without antifreeze agent condition
Total amount of water in the system should be below
150 L.
If the total amount of water is more than 150 L, please
add expansion vessel (field supply).

With antifreeze agent condition
In the case of using antifreeze agent, expansion rate ɛ
is different depending on its maker.
Please refer to the antifreeze agent maker for the
expansion rate ɛ before calculate the upper limit water
volume of the system.
The expansion vessel capacity required for the system
can be calculated from the formula below.
V =
V : Required gas volume <expansion vessel volume L>
Vo : System total water volume <L>
: Expansion rate 5
P
: Expansion tank filling pressure = (100) kPa
1
P : System maximum pressure
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.
[Adjustment of the initial pressure of the expansion
vessel when there is a difference in installation height]
If the height difference between the Mono bloc 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.
Pg= (H*10+30) kPa
64
*(0.1 MPa
x Vo
98 + P
1
1 -
98 + P
2
→
60˚C = (depends on antifreeze
agent used)
= 300 kPa