Panasonic WH-ADC0309H3E Service Manual page 58


A Pressure Reducing Valve (field supply) with
below specification is strongly advised to be
installed along the line of the tube connector i of
Tank Unit. Refer Typical Piping Installation section
to locate both of these valves.
Recommended Pressure Reducing Valve
specifications:
Set pressure: 0.35 MPa (3.5 bars)
o

Must connect a faucet to Tank Unit Tube
Connector i and main water supply, in order to
supply water with appropriate temperature for
shower or tap usage. Failure to do so might cause
scalding.

Failure to connect the tube appropriately might
causing the Tank Unit malfunction.
(C) Pressure Relief Valve Drainage Pipework

Connect a drain hose to the Pressure Relief Valve
hose outlet .
h

The hose must be installed in a continuously
downward direction and left open to the frost-free
atmosphere.

If drain hose is long, use a metal support fixture
along the way to eliminate the wavy pattern of
drain tube.

The water may drip from this discharge hose.
Therefore must guide the hose without close or
block the outlet of the hose.

Do not insert this hose into sewage hose or
cleaning hose that may generate ammonia gas,
sulphuric gas etc.

If necessary, use a hose clamp to tighten the hose
at drain hose connector to prevent it from leaking.

Guide the drain hose to outdoor as illustrated at
the right figure.
Possible wall
Illustration of guide
drain hose to outdoor
(D) Domestic Hot Water Tank Discharge (Drain
Tap) and Safety Relief Valve Pipework

Safety Relief Valve 0.8MPa (8 bars) incorporated
in Domestic Hot Water Tank.

Drain Tap and Safety Relief Valve discharge
fittings share the same drainage outlet.

Use R½" male connector for this drainage outlet
connection (Tube connector

Piping must always be installed in a continuously
downward direction. It must not be longer than
2m, with no more than 2 elbows, and must not
allow condensation to build up or freezing to
occur.

The pipe from this drainage outlet fitting must not
be shut off. The discharge must be freed.
Discharge below
fixed grating
Fixed grating
Trapped gulley
).

The end of this pipework must be in such a way
so that the outlet is visible and cannot cause any
damage. Keep away from electrical components.

It is recommended to fit a tundish into this
pipework. Tundish should be visible and
positioned away from frost environment and
electrical components.
(E) Drain Elbow and Hose Installation

Fix the Drain Elbow and Packing to the bottom of
Drain Water Hole

Use inner diameter 17 mm drain hose in the
market.

This hose must to be installed in a continuously
downward direction and in a frost-free
environment. Improper drain piping may cause
water leakage hence damage the furnitures.

Guides this hose outlet to outdoor only.

Do not insert this hose into sewage or drain pipe
that may generate ammonia gas, sulphuric gas,
etc.

If necessary, use hose clamp to further tighten the
hose at drain hose connector to prevent leakage.

Water will drip from this hose, therefore the outlet
of this hose must be installed in an area where the
outlet cannot become blocked.
Packing
11.1.3.5 Air-Tightness Test on the
Refrigerating System
Before system charged with refrigerant and before the
refrigerating system in put into operation, below site
test procedure and acceptance criteria shall be
verified by the certified technicians, and/or the
installer:-
Step 1: Pressure test for refrigerant leak detection:
1) Steps for pressure test, in accordance to ISO
5149.
2) Evacuate the system from refrigerant before the
leak test, attach the gauge manifold set correctly
and tightly. Charging hose of Low side connect to
Gas side. (Charging hose of High side connect to
Liquid side if applicable.)
3) Adjust the knob on the service valves, and
regulator on the gauge set, so that test gas can be
inserted through the centre manifold of the gauge
set.
4) Insert Nitrogen gas into the system through the
centre manifold and wait until the pressure within
the system to reach about 1MPa (10 BarG) wait
for a few hours and monitor the pressure reading
on the gauges.
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Drain
Elbow
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