Water Piping; Water Piping Length; Water Piping Size - Hitachi RWM-2R1E Installation & Operation Manual

REFRIGERANT AND WATER PIPING

5.3 WATER PIPING

5.3.1 Water piping length

Consider the following guidelines when designing the water circuit.
Maximum water piping length between indoor unit and DHW tank
Maximum water piping length between indoor unit and 3-way valve
Maximum water piping length between 3-way valve and DHW tank

5.3.2 Water piping size

YUTAKI S
Model
Inlet connection
(2.0-3.0)HP G 1" (female)
(4.0-10.0)HP G 1-1/4" (female)
YUTAKI S COMBI
Model
Inlet connection
G 1"
(2.0-3.0)HP
(female)
G 1"
(4.0-6.0)HP
(female)
(*): Only for models for UK market
27 PMML0575 rev.1 - 09/2021
Item
Space heating pipes connection
Outlet connection Shut-off valves
G 1" (female)
G 1-1/4" (male) -
G 1-1/4" (female)
G 1-1/4" (male)
Space heating connection
Outlet connection Shut-off valves
G 1"
(female)
G 1"
(female)
(inches)
G 1" (male) -
G 1" (male)
Inlet connection
G 1" (male) - G 3/4"
G 1" (male) (male)
G 1" (male) - G 3/4"
G 1" (male) (male)
YUTAKI S YUTAKI S COMBI
10 m --
3 m --
10 m --
DHW connection
Pressure and
Outlet connection temperature relief
valve (*)
G 3/4"
Ø15 mm
(male)
G 3/4"
Ø15 mm
(male)
(inches)