Panasonic WH-SXC09H3E8 Service Manual page 68

2. Set the Pressure Relief Valve
Lever
Turn up
Pressure relief valve
3. Start filling water (with pressure more than 0.1
MPa (1 bar)) to the Indoor Unit via water inlet.
Stop filling water if the free water flow through
Pressure Relief Valve drain hose.
4. Turn ON the power supply and make sure Water
16
Pump is running.
5. Check and make sure no water leaking at the tube
connecting points.
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.
11.1.8.1 Check Water Pressure
*(0.1 MPa = 1 bar)
Water pressure should not lower than 0.05 MPa (with
inspects the Water Pressure Gauge
add tap water into Tank Unit. Refer to Tank unit
installation instruction for details on how to add water.
11.1.8.2 Check Pressure Relief Valve

Check for correct operation of Pressure Relief
13
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
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 50 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
260 L.
13
level "DOWN".
Pressure relief
valve
13
13
WARNING
14
). If necessary
12
Pre
If the total amount of water is more than 260 L, please
add expansion vessel (field supply).
The expansion vessel capacity required for the system
can be calculated from the formula below.
V : Required gas volume <expansion vessel volume L>
Vo : System total water volume <L>
: Water expansion rate 5
P : Expansion tank fi lling 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.
Water expansion rate table
Water Temperature (°C)
[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 7 m, please adjust the initial pressure of the
13
expansion vessel (Pg) according to the following
formula.
11.1.8.4
Ensure the RCCB/ELCB set to "ON" condition before
check RCCB/ ELCB.
Turn on the power supply to the Indoor Unit.
This testing could only be done when power is
supplied to the Indoor Unit.
Be careful not to touch parts other than RCCB/ELCB test button
when the power is supplied to Indoor Unit. Else, electrical shock
may happen. Before obtaining access to terminals, all supply
circuits must be disconnected.

Push the "TEST" button on the RCCB/ELCB. The
lever would turn down and indicate "0", if it
functions normal.

Contact authorized dealer if the RCCB/ELCB
malfunction.

Turn off the power supply to the Indoor Unit.

If RCCB/ELCB functions normal, set the lever to
"ON" again after testing finish.
68
x
Vo
V =
98 +
P
1 - 1
98 +
P
2
60°C = 0.0171
= 300 kPa
Water expansion rate ε
10
20
30
40
50
60
70
80
90
Pg= (H*10+30) kPa
Check RCCB/ELCB
WARNING
0.0003
0.0019
0.0044
0.0078
0.0121
0.0171
0.0228
0.0291
0.0360