Piping Installation - Panasonic WH-MDC09C3E8 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 (for 12.0 ~ 16.0 kW) and 30 litres (for 9.0 kW). If
these values 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.

Do not install any valve between Mono bloc unit and water piping to avoid accidental closure of water supply to
the Mono bloc unit.

Use Rp 1 ¼" nut for both water inlet and water outlet connection and clean all piping with tap water before install.

If old heat pump terminal / tank is utilized, please clean the dust properly before installation.

Refer Diagram 3.1 for installation of 3-way Valve Kit.

Must install an external filter (30 mesh or more, field supply) before water inlet connector of Mono bloc unit
(indicate with "WATER IN").

Connect the external of Mono bloc unit (indicate with "WATER OUT") to boiler tank inlet. Fail to connect the tube
appropriately might causing the Mono bloc 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. Further tighten the nuts with torque wrench in specified
torque as stated in the table.

If non-brass metallic piping is used for installation, make sure to insulate the piping to prevent galvanic corrosion.

Do not use worn out piping.

Make sure to insulate the water circuit piping (insulator thickness : 20mm or more) to prevent condensation
during cooling operation and 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.
WARNING
Model
WH-MDC09C3E8
WH-MDC12C9E8
WH-MDC14C9E8
WH-MDC16C9E8
41
Nut size (Torque)
Water
RP 1 1/4" [117.6 N•m]