4.7.3 Connection of waterway system
(1) If connection between water tank and indoor unit should be through the wall, drill a hole φ70 for
pass of circulating water pipe. It is unnecessary if the hole is not needed.
(2) Preparation of pipelines: Circulating water outlet/inlet pipe must be hot water pipe, PPR pipe with
nominal out diameter of dn25 and S2.5 series (wall thickness of 4.2mm) being recommended. Cooling
water inlet pipe and hot water outlet pipe of water tank should also be hot water pipe, PPR pipe with
nominal out diameter of dn20 and S2.5 series (wall thickness of 3.4mm) being recommended. If other
insulated pipes are adopted, refer to the above dimensions for out diameter and wall thickness.
(3) Installation of circulating water inlet/outlet pipes: connect the water inlet of the unit with circulating
outlet of water tank and water outlet of unit with circulating inlet of water tank.
(4) Installation of water inlet/outlet pipes of the water tank: safety check valve, filter and cut-off valve
must be installed for the water inlet pipe according to the installation sketch of the unit. At least a cut-off
valve is needed for the water outlet pipe.
(5) Installation of blow-off pipes at the bottom of water tank: connect a piece of PPR pipe with
drainage outlet to floor drain. A cut-off valve must be installed in the middle of the drainage pipe and at
the place where it is easy to be operated by the users.
(6) After connection of all waterway pipelines, perform the leakage test firstly. After that, bind up the
water pipes, water temp sensor and wires with wrapping tapes attached with the unit.
(7) Refer to Installation Sketch of the Unit for details.
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