Table of Contents
Advertisement
Header
Gas pipe
C
Outdoor
GOOD
unit side
Horizontal line
Liquid pipe
D
Outdoor
unit side
GOOD
PROHIBITED
Do not connect a separation tube after a header.
Leave the distance 0.5 m or more for straight part to branch tube and header.
0.5 m or more
Main pipe
To indoor unit
0.5 m or more
Main pipe
To indoor unit
0.5 m or more
0.5 m or more
5.3. Opening the knockout hole
Be careful to prevent panel deformation or damaged while opening the knockout hole.
To prevent cutting of the wiring after the knockout hole was opened, remove the burrs
along the edge.
In addition, to prevent rusting, painting the edge with rust preventive paint is recom-
mended.
The piping can be connected from 2 directions; the front or the bottom.
(Knockout holes are provided so that the piping can be connected from 2 different direc-
tions.)
Use the front knockout hole, as required.
Fig. A Knockout position
Fig B Detail of knockout position
(bottom)
(Unit: mm)
Knockout
hole
En-9
Horizontal line
Horizontal line
β
1
H
= 0 to 10 mm
1
(α
: 0° to 1°)
1
α
β
: -10° to 10°
1
C
View
1
H
1
Vertical line
H
= 0 to 10 mm
2
α
(α
: 0° to 1°)
2
2
H
β
2
β
: -10° to 10°
2
2
D
View
CAUTION
Separation tube
To indoor unit
Header
To indoor unit
Separation tube
To indoor unit
Header
To indoor unit
CAUTION
Fig C Detail of knockout position
(front)
Knockout hole
73
125
43
199
5.4. Pipe connection
Do not use mineral oil on a flared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
While brazing the pipes, be sure to blow dry nitrogen gas through them.
The maximum lengths of this product are shown in the table. If the units are further
apart than this, correct operation cannot be guaranteed.
5.4.1 Bending pipes
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 100 mm or more.
If the pipe is bent repeatedly at the same place, it will break.
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle of more than 90°.
• When pipes are repeatedly bent or stretched, the material will harden, making it difficult
to bend or stretch them anymore.
• Do not bend or stretch the pipes more than 3 times.
5.4.2 Removing the pinch pipe
Remove the pinch pipe only when the internal gas is completely drained as shown on
the below instructions.
If gas still remains inside, the piping may crack if you melt the brazing filler metal of the
junction area with a burner.
Before connecting the piping, remove the pinch pipe in accordance with the following
instructions:
(1) Verify that the liquid
side, suction gas side
and discharge gas
side 3-way valves are
closed.
3-way valve
5.4.3 Pipe connection
Seal the pipe route hole with putty (Locally purchased) such that there are no gaps.
Small insects or animals that are trapped in the outdoor unit may cause a short circuit in the
electrical component box.
To prevent pipe damage; do not make sharp bends.
Bend the pipe at a radius of 70 mm or greater.
Do not bent pipe many times at same part to prevent break.
After completing all the pipe connection by brazing, perform the indoor unit pipe connec-
tion with a flare joint.
When removing the pinch pipe or brazing the joint pipe, carry out the work while cooling
down the 3-way valve sufficiently.
• Braze the joint pipe onto the 3-way valves at the liquid, suction gas and discharge gas
side.
Install the joint pipe appropriately so that it can be connected easily with the main pipe.
• Braze the joint pipe at the liquid, suction gas and discharge gas side with the main pipe.
* Be sure to supply nitrogen when brazing.
(Unit: mm)
CAUTION
CAUTION
WARNING
(2) Cut the end of the
liquid side, suction gas
side and discharge gas
side pinch pipe and
vent the gas inside the
pinch pipe.
Pinch pipe
End of pinch pipe
CAUTION
(3) After all the gas is
vented, melt the
brazing filler metal on
connecting part using
a torch and remove
the pinch pipe.
Advertisement
Table of Contents
