Hitachi YUTAKI S COMBI Serie Manual De Instrucciones página 25

REFRIGERANT AND WATER PIPING
100
90
80
70
60
50
40
30
20
10
0
1.8 1.9 2.0 2.1
Total refrigerant amount in the system (kg)
?
N O T E
In case of not achieving the minimum floor area, contact with your dealer.

Refrigerant piping size
Piping connection size of outdoor unit & indoor unit
Model Piping length
2HP 3~50m
2.5HP 3~50m
3~27m Ø 15.88 (5/8") (*)
3HP
27~40m Ø 15.88 (5/8")
Model Piping length
2HP 3~50m
2.5HP 3~50m
3~27m
3HP
27~40m
Model Piping length
2HP 3~50m
Ø 15.88 (5/8") (*)
2.5HP 3~50m
3~27m Ø 15.88 (5/8")
3HP
27~40m Ø 15.88 (5/8")
?
N O T E
(*): The refrigerant gas and liquid piping size for 2/2.5/3HP are different
between outdoor and indoor unit, so refrigerant pipe adapters are
required. These pipe adapters are factory supplied with the outdoor unit:
Model
Gas pipe
2 HP Ø15.88→Ø12.7
2.5 HP Ø15.88→Ø12.7
3.0 HP
7 PMML0573 rev.1 - 07/2021
2.2 2.3 2.4 2.5 2.6 2.7 2.8
Outdoor unit
Pipe Connection size
Gas pipe Liquid pipe
Ø 12.7 (1/2") Ø 6.35 (1/4")
Ø 9.52 (3/8") (*)
Ø 9.52 (3/8")
Refrigerant pipe
(Between OU and IU)
Gas pipe Liquid pipe
Ø 12.7 Ø 6.35
Ø 15.88 Ø 6.35
Ø 15.88 Ø 9.52
Indoor Unit
Pipe Connection size
Gas pipe Liquid pipe
Ø 6.35 (1/4")
Ø 9.52 (3/8") (*)
Ø 9.52 (3/8") (*)
Ø 9.52 (3/8") (*)
Pipe adapter
Liquid pipe
-
Ø9.52→Ø6.35
Ø9.52→Ø6.35 (x2)
-
4.3.3 Refrigerant charge
4.3.3.1 Refrigerant charge amount
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.
4.3.3.2 Refrigerant charge before shipment
(W (kg))
0
2.9
Outdoor unit model
RAS-2WHVRP1
RAS-2.5WHVRP1
RAS-3WHVRP1
4.4 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 circuit with water and checking water
pressure and the total absence of any water leakage.
4.4.1 Additional hydraulic necessary elements
for space heating
Nature
Piping connections
Factory supplied
Accessories
Field supplied
The following hydraulic elements are necessary to correctly
perform the space heating water circuit:
• Two shut-down 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-down 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.
W (kg)
0
1.2
1.3
1.3
No. Part name
1 Water inlet (Space heating)
2 Water outlet (Space heating)
3 Shut-off valve (factory-supplied)
Water check valve
4
(ATW-WCV-01 accessory)
5 Shut-off valve