Hitachi YUTAKI S Series Technical Catalogue page 107

8 Refrigerant and water piping
Space heating and DHW
8.2.3 Refrigerant charge
8.2.3.1 Refrigerant charge amount
YUTAKI (S / S COMBI)
The R32 refrigerant is factory charged in the outdoor unit with a refrigerant charge amount for 10 m of piping length
between outdoor and indoor unit.
YUTAKI M
YUTAKI M unit is a Monobloc system (closed refrigerant circuit) which has been factory charged, so additional refrigerant
charge is not required.
8.2.3.2 Refrigerant charge before shipment (W
YUTAKI (S / S COMBI)
YUTAKI M
8.3 Space heating and DHW
!
D A N G E R
Do not connect the power supply to the indoor unit prior to filling the space heating and DHW circuits with water and checking
water pressure and the total absence of any water leakage.
8.3.1 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 except for YUTAKI M series) (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) (5) with 1 shut-off valve (field supplied) (4) 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.
99 TCGB0123 rev.2 - 10/2019
Outdoor unit model
RAS-2WHVRP
RAS-2.5WHVRP
RAS-3WHVRP
Model
RASM-2VRE
RASM-3VRE
Type
Piping connections
Factory supplied
Accessories
Field supplied
(kg))
0
W (kg)
0
1.2
1.3
1.3
W (kg)
0
1.2
1.3
Nº Part name
1 Water inlet (Space heating)
2 Water outlet (Space heating)
Shut-off valve (factory-supplied) (Field-
3
supplied for YUTAKI M series)
Water check valve
4
(ATW-WCV-01 accessory)
5 Shut-off valve
8