Space Heating And Dhw; Yutaki S And Yutaki M - Hitachi YUTAKI RWM-2R1E Installation & Operation Manual

REFRIGERANT AND WATER PIPING

6.7 SPACE HEATING AND DHW

6.7.1 YUTAKI S AND YUTAKI M

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D A N G E R
Do not connect the power supply to the indoor unit prior to filling the space heating circuit (and DHW circuit if it were the case) with water
and checking water pressure and the total absence of any water leakage.
6.7.1.1 Additional hydraulic necessary elements for space heating
The following hydraulic elements are necessary to correctly perform the space heating water circuit:
• Two shut-off valves (factory supplied accessory) (3) must be installed in the indoor unit. One at the water inlet connection (1)
and the other at the water outlet connection (2) in order to make easier any maintenance work.
• A water check valve (ATW-WCV-01 accessory) (4) with 1 shut-off valve (field supplied) (5) must be connected to the water
filling point when filling the indoor unit. The check valve acts as a safety device to protect the installation against back pressure,
back flow and back syphon of non-potable water into drinking water supply net.
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Additional hydraulic necessary elements for DHW
63 PMML0575 rev.2 - 03/2022
Nature No.
1
Piping connections
2
Factory supplied 3
Accessories 4
Field supplied 5
Part name
Water inlet (Space heating)
Water outlet (Space heating)
Shut-off valve (factory-supplied)
Water check valve
(ATW-WCV-01 accessory)
Shut-off valve