Hitachi YUTAKI RWM-2R1E - Water Piping; Water Piping Length; Water Piping Size

6.5 WATER PIPING
6.5.1 Water piping length
Consider the following guidelines when designing the water circuit.
Item YUTAKI S YUTAKI S COMBI
YUTAKI S80
YUTAKI M
(R410A) /
YUTAKI M
(R32)
DHW tank
above the
indoor unit
DHW tank
beside the
indoor unit
Maximum water piping length between indoor unit and
DHW tank
10 m -- -- 10 m 10 m
Maximum water piping length between indoor unit and
3-way valve
3 m -- -- 3 m --
Maximum water piping length between 3-way valve and
DHW tank
10 m -- -- 10 m 10 m
6.5.2 Water piping size
YUTAKI S
(inches)
Model
Space heating pipes connection
Inlet connection Outlet connection Shut-off valves
(2.0-3.0)HP G 1” (female) G 1” (female)
G 1” (male) -
G 1” (male)
(4.0-10.0)HP G 1-1/4” (female) G 1-1/4” (female)
G 1-1/4” (male) -
G 1-1/4” (male)
YUTAKI S COMBI
(inches)
Model
Space heating connection DHW connection
Inlet connection Outlet connection Shut-off valves Inlet connection Outlet connection
Pressure and
temperature relief
valve (*)
(2.0-3.0)HP
G 1”
(female)
G 1”
(female)
G 1” (male) -
G 1” (male)
G 3/4”
(male)
G 3/4”
(male)
Ø15 mm
(4.0-6.0)HP
G 1”
(female)
G 1”
(female)
G 1” (male) -
G 1” (male)
G 3/4”
(male)
G 3/4”
(male)
Ø15 mm
(*): Only for models for UK market
YUTAKI S80 indoor unit
Type 1: Version for operation in DHW but with a remote tank (RWH-(4.0-6.0)(V)NFE)
(inches)
Model
Space heating connection
Inlet connection
Outlet
connection
Shut-off valves
(4.0-6.0)HP
G 1-1/4”
(female)
G 1-1/4”
(female)
G 1-1/4” (male) -
G 1-1/4” (male)
REFRIGERANT AND WATER PIPING
PMML0575 rev.2 - 03/2022
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