Air Source Heat Pump Water Heater
19
pump. Wait 2 minutes. If the number indicated by the pressure gauge
pointer does not rise, the vacuumization and piping are successful. If
the number indicated by the pressure gauge pointer rises, it indicates
that air is entering the system. In this case, check the piping for leaks,
and vaccumize the air 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) Pipe preparation
The hot water outlet shall select hot water pipe, PPR pipe is recommended,
with fast heat dissipation, e.g. aluminum plastic tube is not suggested.
(2) Water inlet and outlet pipe installation
Water inlet pipe shall install safety valve, filter and cut off valve, installation
sequence shall accord with unit installation diagram. Water outlet pipe shall have
at least one cut off valve.
To drain or clean the water tank, add a 3-way and a cut off valve in water
outlet of water tank; If the water tank is far away from user water use site (hot
water pipe is
＞
20m), or water use site of all hot water is lower than water inlet of
the water tank, installation is needed.
(3) Drainage pipe installation
As Figure 8-1 is shown, add a 3-way valve in cold water inlet pipe, then
connect the 3-way connector and floor drain with pipeline, meanwhile the
connection side of drainage pipeline and floor drain shall be lower than water
tank bottom, otherwise, water cannot be discharged completely. A cut off valve
must be installed in drainage pipeline, and the cut off valve must be installed in
places where the user is accessible.
(4) Safety valve installation
The safety vale (“→” indicates the direction to the water tank) supplied with