30
PMEN0645 rev.0 - 04/2023
5
SPACE HEATING AND DHW
REFRIGERANT PIPING
The following hydraulic elements are necessary to correctly perform the space heang water circuit:
• Two shut-down valves (factory supplied accessory) (3) must be installed in the indoor unit. One
at the water inlet connecon (1) and the other at the water outlet connecon (2) in order to
make easier any maintenance work.
• A water check valve (ATW-WCV-01 accessory) (4) with 1 shut-down valve (eld supplied) (5)
must be connected to the water lling point when lling the indoor unit. The check valve acts as
a safety device to protect the installaon against back pressure, back ow and back syphon of
non-potable water into drinking water supply net.
5.4.4.2 Addional hydraulic necessary elements for DHW
YUTAKI S Combi is factory-supplied ready for DHW operaon (Fied with DHW tank and 3-way
valve). Only the following elements are required in the DHW circuit:
DHW TANK
Nature No. Part name
Piping connecons
1 Water inlet (DHW)
2 Water outlet (DHW)
Field supplied
3
Pressure and temperature relief valve
3a Shut-o valve
3b Water check valve
3c Pressure relief valve
4 Shut-o valve
5 Draining
• 1 Shut-down valve (eld supplied): one shut-down valve (4) must be connected aer the DHW
water outlet connecon 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 water inlet connecon 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:
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