-
179
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4) When you need to bend a pipe, bend it to the largest possible radius (R100-
R150) permitted. Do not bend a pipe repeatedly in an effort to shape it
appropriately.
5) In laying pipes, take care to avoid debris, chips or water
from entering the piping system.
6) A unit and a refrigerant pipe are to be flare connected.
Flare a pipe after you have attached a flare nut to the pipe.
The dimensions of flaring for R410A are different from
those for the conventional R407C refrigerant. Although
we recommend the use of flare tools developed specifi-
cally for R410A, conventional flare tools can also be used,
if the measurement of protrusion B is adjusted with a pro-
trusion control copper pipe gauge.
7) Tighten a flare joint securely with double spanners. Ob-
serve the following tightening torque values for flare nuts:
8) A branching pipe set (option part supplied separately) and
refrigerant piping should be connected by blazing.
9) In blazing pipes, keep nitrogen gas flowing inside the pipes
so that an oxide film may not form on the inner surfaces
of the pipes.
0~0.5
ø6.35
ø9.52
ø12.7
ø15.88
Copper
pipe outer
diameter
Copper pipe protrusion for flaring: B (mm)
1.0~1.5
With an R410A tool
In the case of a rigid (clutch) type
With a conventional tool
B
Operation valve
size (mm)
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
Tightening
torque (N·m)
14~18
34~42
49~61
68~82
Tightening
angle (
°
)
45~60
30~45
30~45
15~20
Recommended length
of a tool handle (mm)
150
200
250
300
Do not hold the valve cap area with a spanner.
Please use a torque wrench. If a torque wrench is not
available, fasten the flare nut manually first and then
tighten it further, using the left table as a guide.
10) Tighten a flare joint securely with a double spanner.
a) Do not apply force beyond proper fastening torque in tightening the flare nut.
b) Fix both liquid and gas service valves at the valve main bodies as illustrated on the lower, and then
fasten them, applying appropriate fastening torque.
(c)
How to remove the side cover Unscrew a screw from the side cover
(d)
Refrigerant pipe connection
●
Install a pipe carefully so that it may not touch the unit’s internal components.
●
A pipe touching with an internal component can generate abnormal noises or vibrations.
Side cover
Fixing screw
⁄
Pipes can only be laid toward
the rear direction.
