Hitachi AIR CORE 700 PPIM-B18UFA1DQ Manuel D'utilisation, D'installation Et D'entretien page 22

5. Refrigerant Piping Work
5. Refrigerant Piping Work
DANGER
!
Use only R32 refrigerant. During leakage and air tight test, no oxygen, acetylene, flammable or
•
poisonous gases must be charged, as these gases may cause explosion. It is recommended to use dry
nitrogen for test.
5.1 Piping Materials
1. Prepare copper pipes suitable for use with R32 refrigerant and comply with local regulations on
installation site.
2. Choose clean copper pipe with no dust and moisture within. Before installation, remove any dust and
impurities with nitrogen gas or dry air.
3. Select the copper pipes as per figure 5.2.
5.2 Piping Connection
1. See positions of the pipe connection in figure 5.1.
3.6(92)
2.8(70)
3.5(90)
NOTE:
Position for the selected condensate pipe is shown in figure 5.1 and the drain hole below is blocked
•
with a rubber plug.
Perform the flaring work as shown below.
90
º
ΦA
Φd
Refrigerant Gas Pipe
Refrigerant Liquid Pipe
10.6(270)
13.6(345)
15.8(401)
17.0(431)
Figure 5.1 Positions of the Pipe Connection
Capacity(Btu/h)
18000~24000
30000~48000
Figure 5.2 Pipe Diameter
+ 2
º
0.02~0.03(0.4~0.8)R
Figure 5.3 Flaring Processing
Drain Pipe Only with water pump
Drain Pipe
[Unit: in. (mm)]
Gas Pipe Liquid Pipe
1/2 (12.70) 1/4 (6.35)
5/8 (15.88) 3/8 (9.53)
Diameter
Ød
1/4 (6.35)
3/8 (9.53)
1/2 (12.7)
5/8 (15.88)
-10-
[Unit: in. (mm)]
[Unit: in. (mm)]
+0 +0
( )
A
-1/64 -0.4
R32
11/32 (9.1)
1/2 (13.2)
10/16 (16.6)
3/4 (19.7)