Hitachi RAS-3WHVRP Technical Catalogue

8 Refrigerant and water piping
Refrigerant circuit
TCGB0123 rev.2 - 10/2019
98

Minimum area requirements
In case of total refrigerant amount ≥1.84 kg, the unit should be installed, operated and stored in a room with a oor area
larger than the minimum criteria. Use following graphic and table to determine these minimum criteria:
Refrigerant
Amount (kg)
Minimum Area
(m
2
) (H:2.2m)
1.84 28.81
1.9 30.72
2.0 34.09
2.1 37.53
2.2 41.19
2.3 45.02
2.4 49.02
2.5 53.19
2.6 57.53
2.7 62.04
2.8 66.72
2.9 71.58
Minimum room area for installation (m
2
)
0
10
20
30
40
50
60
70
80
90
100
1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.62.7 2.82.9
Total refrigerant amount in the system (kg)
? NOTE
In case of not achieving the minimum oor area, contact with your dealer.
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Refrigerant piping size
Piping connection size of outdoor unit & indoor unit
Outdoor unit Refrigerant pipe Indoor Unit
Model
Piping
length
Pipe Connection size
(Between Outdoor unit and
Indoor unit)
Pipe Connection size
Gas pipe Liquid pipe Gas pipe Liquid pipe Gas pipe Liquid pipe
2HP 3~50m
Ø 12.7 (1/2”) Ø 6.35 (1/4”) Ø 12.7 Ø 6.35 Ø 15.88 (5/8”) (*)
Ø 6.35 (1/4”)
2.5HP 3~50m Ø 9.52 (3/8”) (*)
3HP
3~27m Ø 15.88 (5/8”) (*) Ø 9.52 (3/8”) (*) Ø 15.88 Ø 6.35 Ø 15.88 (5/8”) Ø 9.52 (3/8”) (*)
27~40m Ø 15.88 (5/8”) Ø 9.52 (3/8”) Ø 15.88 Ø 9.52 Ø 15.88 (5/8”) Ø 9.52 (3/8”) (*)
? NOTE
(*): 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
Pipe adapter
Gas pipe Liquid pipe
2 HP Ø15.88→Ø12.7 -
2.5 HP Ø15.88→Ø12.7 Ø9.52→Ø6.35
3.0 HP
-
Ø9.52→Ø6.35 (x2)

Hitachi RAS-3WHVRP Specifications

General

Brand	Hitachi
Model	RAS-3WHVRP
Category	Heat Pump
Language	English