Hitachi RAS-5HRNME-AF - Page 109

9. Refrigerant and water piping
TCGB0075 rev.0 - 11/2012
109
9

Hydraulic necessary elements
The next hydraulic elements are necessary to correctly perform the domestic hot water circuit:
• 1 Security water valve (DHWT-SWG-01 accessory): this Hitachi accessory (1) is a pressure and temperature relief
valve that must be installed as near as possible at the DHW inlet connection before the DHW inlet water pipe factory
supplied (10) (pressure setting 7 bar; temperature setting 90ºC). The security water valve provides:
- Pressure protection
- Non-return function
- Shut-off valve
- Filling
- Draining
1
6
4
3
5
2
Ref. Name

Main inlet water (DHW inlet)

DHW inlet connection

Pressure relief valve and manual empty

Emptying connection (drain pipe)

Water check valve (non return)

Shut-off valve
Security water valve
(DHWT-SWG-01)
N O T E
The discharge pipe should be always open to the atmosphere, free of frost and in continuous slope to the down
side in case that water leakage exists.
• 1 Shut-off valve (eld supplied): one (4) must be connected after the DHW outlet water pipe factory supplied (9) in
order to make easier any maintenance work.

Hydraulic optional elements
In case of a recirculation circuit for the DHW circuit:
• 1 Recirculation pump (eld supplied): this 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 (2) is connected after the pump (3) in order to
ensure the non-return of water.
• 2 Shut-off valves (eld supplied): one (4) before the pump (3) and one (4) after the check valve (2) in Shut-off valve
(eld supplied).
N O T E
lfthedomesticcoldwaterentrypressureishigherthantheequipment’sdesignpressure(6bar),apressureredu-
cermustbettedwithanominalvalueof7bar.