Piping Installation - Panasonic WH-MHF09G3E5 Service Manual

11.3 Piping Installation

This section is for authorized and licensed electrician / water system installer only. Work behind the front plate secured by screws
must only be carried out under supervision of qualified contractor, installation engineer or service person.
Please engage a licensed water circuit installer to install this water circuit.

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).

This water circuit must comply with relevant European and national regulations (including EN61770), and local
building regulation codes.

Ensure the components installed in the water circuit could withstand water pressure during operation.

Do not apply excessive force to piping that may damage the pipes.

Use Rp 1 ¼" nut for both water inlet and water outlet connection and clean all piping with tap water before
connecting to the Mono bloc unit.

Cover the pipe end to prevent dirt and dust when inserting it through a wall. If an existing tank is to be connected
to this Mono bloc unit, ensure the pipes are clean before water pipe installation is carried out.

An external filter (30 mesh or more field supplied) must be installed before the water inlet of the Mono bloc unit.

Refer to Diagram 3.1 for pipe connection of Radiator, Floor Heater, Tank Unit, Solar Pump Station, 3-way Valve
Kit and etc. Fail to connect the pipes appropriately might cause the unit malfunction.

Choose proper sealer which can withstand the pressures and temperatures of the system.

Make sure to use two spanners to tighten the connection. Tighten the nuts with torque wrench: 117.6 N•m.

If non-brass metallic piping is used for installation, make sure to insulate the piping to prevent galvanic corrosion.

Do not use pipes that are crushed or deformed. If these inferior pipes are used, it may cause unit malfunction.

Make sure to insulate the water circuit piping (insulator thickness: 20mm or more) to prevent reduction of heating
capacity, as well as avoid freezing of the outdoor water circuit piping during winter season.

After installation, check the water leakage condition in connection area during test run.

In case of a power supply failure or pump operating failure, drain the system (as suggested in the figure below).
When water is idle inside the system, freezing up is very likely to happen which could damage the system.
Room Thermostat
(Field supply)
Mono Bloc Unit
(Complete with Tank Unit)
3-way Valve
Water Inlet
Water
Kit (Field
External Filter Outlet
(Field supply)
Solar Pump
Station
(Field supply)
Diagram 3.1: Typical Water Piping Installation
H
WARNING
3-way Valve Kit
supply)
Tank Unit
< H
38
Radiator /
Floor Heater