Refrigerant Piping; Piping Connection - Hitachi AirCore 700 Operation Installation Maintenance Manual

Tighten the nuts of the suspension brackets after the adjustment is completed. Apply LOCK-TIGHT
paint to the bolts and nuts in order to prevent them from loosening. If not done, abnormal noises or
sounds may occur and the indoor unit may come loose.

4. Refrigerant Piping

4.1 Piping Connection

4.1.1 Piping Positions
4.1.2 Size of Piping Connection
Piping size
Model
PCI-2.0 to 3.0UFA1NQ
PCI-4.0 to 6.5UFA1NQ
Thickness of copper pipes
ɸ (in)
1/4
3/8
1/2
5/8
Flare Pipe Dimensions
90 + 2
º º
ΦA
0.4 ~ 0.8R
Φd
Flare Nut Dimensions
Liquid piping (mm(in.))
ɸ 6.35 (1/4)
ɸ 9.52 (3/8)
ɸ (mm)
6.35
9.53
12.70
15.88
Diameter
Φd
6.35(1/4)
9.53(3/8)
12.7(1/2)
15.88(5/8)
Nominal diameter (in.) Nominal diameter (mm)
1/4
3/8
1/2
5/8
Gas piping(mm(in.))
ɸ 12.70 (1/2)
ɸ 15.88 (5/8)
Thickness (mm)
0.80
0.80
0.80
1.00
Unit: mm(in.)
+0
A
-0.4
R32
9.1
13.2
16.6
19.7
6.35
9.53
12.70
15.88
-14-
4. Refrigerant Piping
B (mm)
17
22
26
29