Panasonic WH-ADC0916G9E8, Service Manual, Page: 55 / 205

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11.1.3.3.1 Cutting and Flaring the
Piping
1 Please cut using pipe cutter and then remove
the burrs.
2 Remove the burrs by using reamer. If burrs is
not removed, gas leakage may be caused.
Turn the piping end down to avoid the metal
powder entering the pipe.
3 Please make flare after inserting the flare nut
onto the copper pipes.
Water Piping Installation 11.1.3.4

Please engage a licensed water circuit installer to
install this water circuit.

This water circuit must comply with relevant
European and national regulations (including
EN61770), and local building regulation codes.

The minimum requirement of water in the system
is 50 litres. If this value could not be achieved,
please install additional buffer tank (field supply).

Ensure the components installed in the water
circuit could withstand water pressure during
operation.

Do not use worn out tube.

Do not apply excessive force to pipes that may
damage the pipes.

Choose proper sealer which can withstand the
pressures and temperatures of the system.

Make sure to use two spanners to tighten the
connection. Further tighten the nuts with torque
wrench in specified torque as stated in the table.

Cover the pipe end to prevent dirt and dust when
inserting it through a wall.

Choose proper sealer which can withstand the
pressures and temperatures of the system.

If non-brass metallic piping is used for installation,
make sure to insulate the pipes to prevent
galvanic corrosion.

Use correct nut for all Tank Unit tube connections
and clean all tubes with tap water before
installation. See Tube Position Diagram for detail.
Tube Connector Nut Size Torque

g
&
h
RP 1¼" 117.6 N•m
i
&
j
RP ¾" 58.8 N•m
CAUTION
Do not overtighten, overtightening may cause water leakage.

Make sure to insulate the water circuit pipes to
prevent reduction of heating capacity.

After installation, check the water leakage
condition in connection area during test run.

Failure to connect the tube appropriately might
cause the Tank Unit malfunction.

Protection From Frost:
If the Tank Unit is being exposed to frost while
power supply failure or pump operating failure,
drain the system. When water is idle inside the
system, freezing up is very likely to happen which
could damage the system. Make sure the power
supply is turned off before draining. Heater
Assembly may be damaged under dry heating.

Corrosion Resistance:
Duplex stainless steel is naturally corrosion
resistant to mains water supply. No specific
maintenance is required to maintain this
resistance. However, please note that Tank Unit is
not guaranteed for use with a private water supply.

It is recommended to use a tray (field supply) to
collect water from the Tank Unit if water leakage
occur.
(A) Space Heating/Cooling Pipework

Connect Tank Unit Tube Connector
g
to outlet
connector of Panel/Floor heater.

Connect Tank Unit Tube Connector
h
to inlet
connector of Panel/Floor heater.

Failure to connect the tube appropriately might
cause the Tank Unit malfunction.

Refer below table for the rated flow rate of each
particular Outdoor Unit.
Model Rated Flow Rate (L/min)
Tank Unit Outdoor Unit Cool Heat
ADC0916*E8*
UX09*E8* 20.1 25.8
UX012*E8* 28.7 34.4
UX16*E8* 35.0 45.9
UD09*E8* 20.1 25.8
UD012*E8* 28.7 34.4
UD016*E8* 35.0 45.9
(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
Recommended pre-charge pressure of the
expansion vessel (field supply) = 0.35MPa
(3.5 bars)

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 is strongly advised to be installed
along the line of the tube connector
j
of Tank
Unit. Refer Typical Piping Installation section to
locate both of these valves.

Recommended Pressure Reducing Valve
specifications:
o
Set pressure: 0.35 MPa (3.5 bars)
When properly flared, the internal surface
of the flare will evenly shine and be of even
thickness. Since the flare part comes into
contact with the connections, carefully check
the flare finish.

Improper flaring

Inclined Surface
damaged
Cracked Uneven
thickness
1. To cut 2. To remove burrs 3. To flare
Bar
Red arrow mark
Handle
Core
Yoke
Clamp handle
Bar
0 – 0.5 mm
Copper
pipe
Reamer
Point down
Pipe