Hitachi RAS-3.0PNNBDH1 - Wired Controller Basic Operations

6
Installation instructions
The shorter the refrigerant piping is, the better the performance will be. So the connecting pipe should be as short
as possible.
1. Piping Requirement
2. Piping Material
(1) Prepare locally-supplied copper pipes.
(2) Select clean copper pipes. Make sure there is no dust and moisture inside of the pipes. Blow the inside of the pipes
with nitrogen or dry air to remove any dust or foreign materials before connecting pipes.
Additional Refrigerant Charge
The unit has been filled with refrigerant, but if the pipe exceeds 24.6 ft. (7.6m), additional refrigerant (R410A)
charge is required.
For 1.0~1.5HP(9K~12K): Additional refrigerant charge =(L-24.6)×0.161 oz/ft
For 2.0~4.0HP(18K~36K): Additional refrigerant charge =(L-24.6)×0.376 oz/ft
Refrigerant Piping
Model
Outer Diameter of Pipe
in. (mm)
Gas
Liquid
1.0/1.5HP(9K/12K)
ø3/8(ø9.52)
ø1/4(ø6.35)
2.0HP(18K)
ø1/2(ø12.7)
ø1/4(ø6.35)
3.0HP(24K)
ø (ø15.88) 5/8
ø (ø9.52) 3/8
4.0HP(36K)
ø (ø19.05) 3/4
ø (ø9.52) 3/8
Pipe Length L
Height Difference H
Indoor Unit
Outdoor Unit
(3) Piping thickness and material of the pipe are shown as below.
Model
Max. Pipe
Length (L)
Max. Height
Difference (H)
Add. Refrigerant
[exceed 24.6 ft.
(7.6m)]
1.0/1.5HP(9K/12K)
82 ft. (25m)
49 ft. (15m)
0.161 oz/ft (15g/m)
2.0HP(18K)
98 ft. (30m)
49 ft. (15m)
0.161 oz/ft (15g/m)
3.0/4.0HP(24K/36K)
164 ft. (50m)
98 ft. (30m)
0.376 oz/ft (35g/m)
Thickness
[in. (mm)]
Diameter
[in. (mm)]
ø 1/4 (6.35)
ø 3/8 (9.52)
ø 3/4 (19.05)
ø 1/2 (12.70)
ø 5/8 (15.88)
1/32 (0.8)
1/32 (1.0)
1/32 (0.8)
1/32 (0.8)
1/32 (1.0)