Panasonic WH-MHF09G3E5 Service Manual

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Contents

Panasonic WH-MHF09G3E5 Service Manual Manual pdf 38 page image

3811.3 Piping InstallationWARNINGThis section is for authorized and licensed electrician / water system installer only. Work behind the front plate secured by screwsmust 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 installadditional buffer tank (field supply). This water circuit must comply with relevant European and national regulations (including EN61770), and localbuilding 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 beforeconnecting 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 connectedto 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 ValveKit 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 heatingcapacity, 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.Diagram 3.1: Typical Water Piping InstallationRoom Thermostat(Field supply)3-way Valve Kit(Complete with Tank Unit)Radiator /Floor HeaterWaterOutletWater InletMono Bloc UnitExternal Filter(Field supply)Tank Unit3-way ValveKit (Fieldsupply)Solar PumpStation(Field supply)H < H