Panasonic WH-UD03JE5, Service Manual, Page: 72 / 278

72
Model Rated Flow Rate (l/min)
Tank Unit Outdoor Unit Cool Heat
WH-
ADC0309J3E5UK
WH-UD03JE5 9.2 9.2
WH-UD05JE5 12.9 14.3
WH-UD07JE5 17.6 20.1
WH-UD09JE5 20.1 25.8
(B) Domestic Hot Water Tank Pipework

It’s strongly recommended to install an expansion
vessel (field supply) in the Domestic Hot Water
Tank circuit. Refer Typical Piping Installation
section to locate the expansion vessel.
o
Expansion Vessel type and specifications:
-
Size : Not more than ¾"
-
Pre-charge pressure : 0.35MPa (3.5 bars)

If secondary return circuits are used then an
additional expansion vessel may be required.

In high water pressure or water supply is above
500kPa, please install the Pressure Reducing
Valve for water supply. If the pressure higher than
that, it might damage the Tank Unit.

A Pressure Reducing Valve (field supply) and
Pressure Relief Valve (field supply) with below
specification must be installed along the line of the
tube connector
c
of Tank Unit. Refer Typical
Piping Installation section to locate both of these
valves.
o
Pressure Reducing Valve type and
specifications:
-
Size : Not more than ¾"
-
Set Pressure : 0.35MPa (3.5 bars)
o
Pressure Relief Valve type and specifications:
-
Size : Not more than ¾"
-
Set Pressure : 0.8MPa (8.0 bars)

The pressure after pressure reducing valve is less
than 0.35MPa (3.5 bars).

Must connect a faucet to Tank Unit Tube
Connector
d
and urban 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.
Illustration of guide
drain hose to outdoor
Discharge below
fixed grating
Fixed grating
Trapped gulley
Possible wall
(D) Domestic Hot Water Tank Discharge Pipework

Use R½" male connector for Domestic Hot Water
Tank Discharge (Drain Tap)
g
connection.

Piping must to be installed in a continuously
downward direction and in a frost-free
environment.

Discharge pipes must be visible and away from
electrical components.

Guide the drain hose to outdoor as illustrated at
the right figure.

It is recommended to fit a tundish into this
g
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
Drain
Elbow