Hisense Hi-Therma AHZ-100HCDS1 Installation & Maintenance Manual page 24

REFRIGERANT CIRCUIT
● A water check valve (15) with a shut-off valve (16) must
be connected to the water filling point when filling the
water circuit. The check valve acts as a safety device to
protect the installation.
● A domestic hot water tank (17) has to be installed in
combination with the space heating / cooling.
● 3-way valves (9) must be connected at one point of
the water outlet pipe of the installation, used to divert
the water circulation for specific functions. As shown
in example, connect straight through of 3-way valve to
DHW tank inner coil.
● DHW thermistor (10) must be installed to reach the
inner wall of the DHW tank and keep in good contact
with it. Space heating thermistor (11) must be installed
on the metal tube close to space heating, and keep in
good contact with it.
● Mixing valve (14) is recommended to use ESBE
ARA661, which operation mode is 3-point SPDT. If
mixing valve of other brands or models are used, the
operation mode must be 3-point SPDT, and power
supply must be 220-240V ~ 50Hz. The rotation time can
be set in the master controller.
Additionally, the following elements are required for
the DHW circuit:
3 3
3
1
DHW TANK
Nature No.
1 Supplementary water inlet of DHW tank
Piping
connections 2 DHW tank outlet
Pressure and temperature relief valve
3a
3
3b
Field supplied
3c
4 Shut-off valve
5 Draining
● A Shut-off valve (field supplied):
The shut-off valve (4) must be connected after the DHW
tank outlet (2) in order to make easier any maintenance
work.
● A Safety water valve (Field-supplied):
This accessory (3) is a pressure and temperature relief
valve that must be installed as near as possible to the
Supplementary water inlet of DHW tank (1). It should
ensure a correct draining (5) for the discharge valve of
this valve. This security water valve should provide the
following:
- Pressure protection
- Non-return function
- Shut-off valve
- Filling
- Draining
3
5
4
2
Part name
Shut-off valve
Water check valve
Safety valve
The discharge pipe should always be open to the atmosphere, free
of frost and in continuous slope to the down side in case that water
leakage exists.
In case of a recirculation circuit for the DHW circuit, the following
elements are required:
1
DHW TANK
Nature No.
1
Piping
connections
2
3
Field supplied 4
5
● A DHW pump (field supplied): This water pump (4) will
help to correctly recirculate the hot water to the DHW
inlet.
● A Water check valve (field supplied):
This accessory (3) is connected after the recirculation
water pump (4) in order to ensure the nonreturn of
water.
● Two Shut-off valves (field supplied) (5):
One before the recirculation water pump (4) and other
after the water check valve accessory (3).
The water check valve shall be confirmed installed in the
correct direction. Otherwise, serious damages may occur in
the DHW tank.
14
5 3 4 5
2
Part name
Supplementary water inlet of DHW tank
DHW tank outlet
Water check valve
Water pump
Shut-off valve