Water Piping; Water Piping Length; Water Piping Size - Hitachi YUTAKI S80 R410A Series Installation And Operation Manual

4 Pay special attention to the place, such as a basement, etc., where the refrigerant can stay, since
refrigerant is heavier than air.
Example:
R (kg) V (m ) C (kg/m
³ ³
3.4 7.5 0.46
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 S80 indoor unit
Type 1: Version for operation in DHW but with a remote tank (RWH-(4.0-6.0)(V)NFE)
Model
Inlet connection
(4.0-6.0)HP
PMEN0648 rev.0 - 03/2023
Outdoor unit (RAS-5WHVNPE)
Floor
3.0 m
Fan
Opening
(m ) (m /min)
2 3
)
1.0 m /min fan linked with gas leak detector or 0.5 m
3
Item
G 1-1/4"
(female)
Refrigerant (R410A): 3.4 kg
2
Indoor unit (RWH-(4.0-6.0)(V)NFE)
Gas leak
detector
Countermeasure
Space heating connection
Outlet connection
G 1-1/4"
(female)
opening
2
YUTAKI S80
DHW tank
DHW tank above
beside the
the indoor unit
indoor unit
-- 10 m
-- 3 m
-- 10 m
Shut-off valves
G 1-1/4" (male) -
G 1-1/4" (male)
5
(inches)
27