Panasonic WH-MDC06E3E5, Service Manual

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11.3 Piping Installation
WARNING
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.
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The minimum requirement of water in the system is 30 litres. If this value could not be achieved, please install
additional buffer tank (field supply).
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This water circuit must comply with relevant European and national regulations (including EN61770), and local
building regulation codes.
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Ensure the components installed in the water circuit could withstand water pressure during operation.
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Do not apply excessive force to piping that may damage the pipes.
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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.
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Cover the pipe end to prevent dirt and dust when inserting it through a wall.
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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.
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An external filter (30 mesh or more field supplied) must be installed before the water inlet of the Mono bloc unit.
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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.
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Choose proper sealer which can withstand the pressures and temperatures of the system.
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Make sure to use two spanners to tighten the connection. Tighten the nuts with torque wrench: 117.6 N•m.
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If non-brass metallic piping is used for installation, make sure to insulate the piping to prevent galvanic corrosion.
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Do not use pipes that are crushed or deformed. If these inferior pipes are used, it may cause unit malfunction.
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Make sure to insulate the water circuit piping (insulator thickness : 20mm or more) to prevent condensation
during cooling operation (cooling model only) and reduction of heating capacity, as well as avoid freezing of the
outdoor water circuit piping during winter season.
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After installation, check the water leakage condition in connection area during test run.
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After test run, please clean the external filter. Reinstall it after finish cleaning.
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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.
Drainage piping installation
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Use a drain hose with inner diameter of 15 mm.
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The hose must be installed in a continuously downward direction and left open to the frost-free atmosphere.
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If drain hose is long, use a metal support fixture along the way to eliminate the wavy pattern of drain tube.
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Water will drip from this hose, therefore the outlet of this hose must be installed in an area where the outlet
cannot become blocked.
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Do not insert this hose into Sewage or drain pipe that may generate ammonia gas, sulfuric gas, etc.
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If necessary, use a hose clamp to tighten the hose at drain hose connector to prevent it from leaking.