Additionally, the following elements are required for the DHW circuit:
Nature
Nº
Part name
Piping connections
1
Water inlet (DHW)
2
Water outlet (DHW)
Field supplied
3
Pressure and temperature relief
valve
3a
Shut-off valve
3b
Water check valve
3c
Pressure relief valve
4
Shut-off valve
5
Draining
•
1 Shut-off valve (field supplied)
: one shut-off valve (4) must be connected after the DHW outlet connection of the DHW tank
(2) in order to make easier any maintenance work.
•
A Security water valve (Field-supplied)
: this accessory (3) is a pressure and temperature relief valve that must be installed as
near as possible to the DHW inlet connection of the 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
?
N O T E
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.
4.3.3 Additional hydraulic optional elements (For DHW)
In case of a recirculation circuit for the DHW circuit:
Nature
Nº
Part name
Piping connections
1
Water inlet (DHW)
2
Water outlet (DHW)
Accessories
3
Water check valve
(ATW-WCV-01 accessory)
Field supplied
4
Water pump
5
Shut-off valve
•
1 Recirculation water pump (field supplied):
this water pump (3) will help to correctly recirculate the hot water to the DHW
inlet.
•
1 Water check valve (ATW-WCV-01 accessory):
this Hitachi accessory (3) is connected after the recirculation water pump (4)
in order to ensure the non-return of water.
•
2 Shut-off valves (field supplied) (5):
one before the recirculation water pump (4) and other after the water check valve
accessory (3).
REFRIGERANT AND WATER PIPING
PMML0336B rev.1 - 03/2016
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