4 Refrigerant Pipe
!
DANGER
• Use the R32 refrigerant. During leakage check and test, do
not mix oxygen, acetylene and other flammable or reactive
gases, because these gases result in explosion.
• Use compressed nitrogen to perform these experiments.
4.1
Pipe material
1
Prepare the copper pipe on the spot.
2
Choose dustless, non-humid, and clean copper pipe. Before
installing the pipe, use nitrogen or dry air to blow away the
tube dust and impurity.
3
Choose the copper pipe according to Fig. 4.2.
4.2 Piping connection
1
The connection positions of the pipe are shown in Fig. 4.1
and Fig. 4.2.
Drain piping
(left)
Gas piping
Liquid piping
Drain piping (right)
(Unit: mm)
Fig. 4.1 Connection positions of the pipe
Capacity
Gas pipe
(mm)
Liquid pipe
(mm)
Drain pipe
(mm)
3.0/3.5HP
∅
15.88
∅
9.52
∅
25(OD)
4.0/5.0/6.0/6.5HP
∅
19.05
∅
9.52
∅
25(OD)
Fig. 4.2 Pipe diameter
The pipe can be connected from three different directions. (rear,
right, top).
If the pipe is routed from the back side, remove the brackets for
easier piping work. After piping, reinstall the removed bracket.
Fig. 4.3
If the pipe is routed from the back side, cut the removed top
cover, and install on the rear panel instead of rear cover.
2
As shown in Fig. 4.4, screw up the nuts with 2 spanners.
Pipe size
Torque (Nm)
∅
6.35mm
20
∅
9.52mm
40
∅
12.7mm
60
∅
15.88mm
80
∅
19.05mm
100
Fig. 4.4
3
After completing refrigerant pipe connection, keep it warm
with the insulation material.
Refrigerant pipe
(field supplied)
Clamp
(attached)
Insulation
(attached)
Insulation
(field supplied)
Side of the
indoor unit
Fig. 4.5 Piping insulation procedure
!
CAUTION
•
The pipe should pass through the hole with a seal.
• Do not place the pipes on the floor directly.
Do not put the pipes directly
on the floor
Protected with tape or plug.
INSTALLATION AND MAINTENANCE
HO2019291HA
17
EN