8 Refrigerant and water piping
Space heating and DHW
TCGB0123 rev.2 - 10/2019
99
8
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
0
(kg))
YUTAKI (S / S COMBI)
Outdoor unit model W
0
(kg)
RAS-2WHVRP 1.2
RAS-2.5WHVRP 1.3
RAS-3WHVRP 1.3
YUTAKI M
Model W
0
(kg)
RASM-2VRE 1.2
RASM-3VRE 1.3
8.3 Space heating and DHW
! DANGER
Do not connect the power supply to the indoor unit prior to lling 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
Type Nº Part name
Piping connections
1 Water inlet (Space heating)
2 Water outlet (Space heating)
Factory supplied 3
Shut-off valve (factory-supplied) (Field-
supplied for YUTAKI M series)
Accessories 4
Water check valve
(ATW-WCV-01 accessory)
Field supplied 5 Shut-off valve
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 (eld supplied) (4) must be connected to
the water lling point when lling the indoor unit. The check valve acts as a safety device to protect the installation
against back pressure, back ow and back syphon of non-potable water into drinking water supply net.
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