Hitachi RPK-3.0FSNM - Page 9

3
REFRIGERANT PIPING
5
3. REFRIGERANT PIPING
3.1. PIPING CONNECTION
3.1.1. PIPING POSITION
Position of piping connection is the following, which is
available from all directions, top, left or right.
■ RPK-0.8 ~ 2.0
(mm)
Model RPK HP L1 L2
0.8~1.5 410 268
Gas Piping
2.0 440 298
Liquid Piping 0.8~2.0 470 328
■ RPK-2.5 ~ 4.0
 CAUTION:
Do not twist the pipe when bending the tube.
(mm)
Model RPK HP L1 L2
Gas Piping 2.5~4.0 550 645
Liquid Piping 2.5~4.0 480 575
1. Right Side Piping
Cut the corner using a plastic cutter as shown below and
remove sharp edges completely.
2. Left Piping
Cut the corner at the left side using a plastic cutter as for
the right side piping.
3. Rear Side Piping
Make a hole by removing the knock-out plate at the rear
side.
3.1.2. SIZE OF PIPING CONNECTION
 In case of R407C
(mm)
Model RPK 0.8/1.0/1.5 2.0 2.5/3.0/3.5
Gas Piping 12.7 15.88 15.88
Liquid Piping 6.35 6.35 9.53
 In case of R410A (FSNE only)
(mm)
Model RPK 0.8/1.0/1.5 2.0 2.5/3.0/3.5 4.0
Gas Piping 12.7 15.88 15.88 15.88
Liquid Piping 6.35 6.35 9.53 9.53
 Special instructions for R410A
As R410A pressure is about 1.4 times higher than R407C,
improper installation may cause a serious trouble.
It is necessary to use the copper pipes, size of flare pipe
ends and flare nuts as shown below.

Flare Pipe Dimensions
(mm)
A
+0/-0.4
Nominal
Diameters
Outer
Diameters
R407C R410A
1/4 6.35 9.0 9.1
3/8 9.53 13.0 13.2
1/2 12.70 16.2 16.6
5/8 15.88 19.4 19.7
Insulation
For Left Side
Piping
142
Contour of the Unit
For Right Side Piping
L1
L2
For Rear Side Piping
Insulation
For Left Side
Piping
125
Contour of the Unit
For Right Side Piping
L1
L2
For Rear Side Piping
Right Side
Cover
Plastic Cutter
Cut this corner
Left Side
Cover
Right
Side
Cover
Right Side Cover