Air Source Heat Pump Water Heater
17
again.
5) Remove the filling pose from the air valve.
6) Fully open valve cores of the gas valve and fluid valve.
7) Tighten the valve caps of the air valve and fluid valve, and the fluoride
injection mouth nut.
8) Tighten the valve caps, and then use a leak detector or soapy water to
check whether the pipes for connecting the outdoor unit and the water tank
leak.
7.3 Water Pipe Connection
（
1
）
Preparing of water pipes
Hot water tank hot water pipes must be selected out of the tube, it is
recommended to use a nominal outside diameter of dn20, S2.5 series PPR pipe.
Such as the use of other similar insulated pipe, can refer to more than the outside
diameter and wall thickness to choose, do not recommend the use of plastic pipe
and other fast heat pipe.
The water tank should be permanently connected to water mains and not
connected by a hose-set.
（
2
）
Installing water outlet and inlet pipes for the water tank
The safety check valve, filter, and cut-off valve must be installed for the water
inlet pipe, and the installation order must be consistent with that shown in the unit
installation diagram. At least a cut-off valve must be installed for the water outlet
pipe.
In order to facilitate water tank emptying or cleaning, you are advised to add a
tee joint and a cut-off valve at the water outlet of the water tank. They must be
installed if the water tank is far away (the hot water pipe is longer than 20 m) from
the location for water use or all locations for water use are lower than the hot water
tap of the water tank.
（
3
）
Installing the safety check valve
Use a PPR pip to connect the safety check valve delivered with the unit to
the water inlet of the water tank (note: the direction indicated by "
" should point to
the water tank) by following Figure 7-5. The other end of the safety check valve is
connected to the tap water for water replenishment. To ensure safe use, please
strictly follow the installation order shown in Figure 7-5. A guide pipe must be
installed for the safety check valve, and the connection must be securely fastened to
