4
Refrigerant Pipe
!
DANGER
Use refrigerant R32 in the refrigerant cycle (refer to outdoor nameplate). Do not charge oxygen, acetylene or other flammable
and poisonous gases into the refrigerant cycle when performing a leakage test or an air-tight test. This type of gases are
extremely dangerous, which may cause an explosion. It is recommended to use nitrogen to perform these tests.
4.1
Pipe Material
1
Prepare locally-supplied copper pipes.
2
Select the piping size from the following table.
Model
Gas pipe (mm)
Liquid pipe (mm)
3.0HP~3.5HP
∅
15.88
∅
9.52
4.0HP~6.5HP
∅
19.05
∅
9.52
3
Select clean copper pipes. Make sure that there is no dust and moisture inside. Blow the pipes with nitrogen or dry air to remove
dust and foreign materials before connecting pipes.
4.2
Piping Connection
1
Position of piping connection is shown in Fig. 4.1 (Indoor Unit).
(Unit: mm)
18 (Gas Pipe)
840 (Unit)
25 (Liquid Pipe)
840 (Unit)
Liquid Pipe Connection
Gas Pipe Connection
127 (Liqu
id Pipe Connection)
102 (Gas Pipe Connection)
180 (Liquid Pipe)
110 (Gas Pipe)
Fig. 4.1 Position of Piping Connection
2
When tightening the flare nut, use two spanners as shown in Fig. 4.2.
Pipe Size
(mm)
Tightening Torque
(Nm)
∅
6.35
20
∅
9.52
40
∅
12.7
60
∅
15.88
80
∅
19.05
100
Fig. 4.2 Tightening Work of Flare Nut
INSTALLATION AND MAINTENANCE
HO2019289HA
18
