INVENTOR DHW-C3.5/A1-K, Service Manual

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HEAT PUMP WATER HEATER INSTALLATION
23
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Note: For safe use of water, water outlet/inlet of water tank must connect with a certain length of
PPR pipe ,L 70×R2
˄
cm
ˈ
R is inside radius of the pipe
˅
. Moreover, heat preservation should be
conducted and metal pipe can not be used. For the first use, water tank must be full of water before
the power is on.
1.4.3 Connection of Waterway System
1. If connection between water tank and main unit should be through the wall, drill a 70mm-hole
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 outer
diameter and wall thickness.
3. Installation of circulating water inlet/outlet pipes: Connect the water inlet of master unit with
circulating outlet of water tank and water outlet of main unit with circulating inlet of water tank.
The manual discharge valve A attached with the unit must be installed vertically and downwards at
water inlet of main unit. The other manual discharge valve B attached with the unit must be
installed vertically and upwards next to circulating inlet of water tank. If allowed, valve B should
be at the place where it is easy to be operated by the users.
4. Installation of water inlet/outlet pipes of water tank: Safety check valve ( on the valve body
points at water tank), filter and cut-off valve must be installed for water inlet pipe according to the
installation sketch of unit. At least a cut-off valve is needed for the water outlet pipe.
5. Installation of drainage pipe: 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. (1) Passing through the wall for connection between master unit and water tank: Wrap the
circulating water pipe with insulated cotton. Cover the temperature sensor with spool. Lead them
together with the earthing wire through the wall pipe after tied by plastic tape. Put protective