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Ainch ( mm)
Tightening
torque
Nut
Pipe diameter inch Clutch ClutchWing nut
ft.i b
inch ( mm) (mm)type t ool type t ool type t ool N-m (kgf.cm)
for R 410A for R 22 for R 22
I/4
13.7 to
1/4 (6.35) (17)
0.06 t o
17.7
0.08
(1.5 t o
3/8 (9.52) 3/8
2.0)
34.3 to
(22)
0.04 to
41.2
0to0.02 0.06
(0 to0.5) (1.0 t o
I/2
1.5)
49.0 t o
1/2 (12.7) (26)
0.08 t o
56.4
0.10
(2.0 t o
5/8
2.5)
73.5 to
5/8 (15.88) ( 29)
78.4
10 to13
(140 to
180)
25 to30
(350 to
420)
36 to42
(500 to
575)
54 to58
(750 to
800)
3-2. FLARE CONNECTION
t) Cut the copper pipe as straight as possible with a pipe cutter.
(Fig. 1, 2)
2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to
avoid getting metal shavings into the piping. (Fig. 3)
3) Remove flare nuts attached to indoor and outdoor units, then put them on pipe.
4) Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension
shown in the table.
Select A mm from the table according to the tool you use.
5) Check
° Compare the flared work with Fig. 6.
° If flare is defective,
cut off the section and repeat procedure.
3-3. PIPE CONNECTION
•
Fasten flare nut with a torque wrench as specified in the table above.
•
When fastened too tight, flare nut may eventually break and cause refrigerant
leakage.
indoor
unit connection
Connect both liquid and gas piping to indoor unit.
• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.
•
To connect, first align the center, then tighten the first 3 to 4 turns of flare nut.
•
Use tightening
torque table above as a guideline for indoor unit side joints, and tighten
using two wrenches.
Excessive tightening damages
the flare section.
Outdoor
unit connection
Connect pipes to stop valve pipe joint of the outdoor unit following
the same procedure
detailed in Indoor unit connection.
•
For tightening,
use a torque wrench or spanner.
3-4. INSULATION AND TAPING
t) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
• When piping has to be installed through a ceiling, closet or where the temperature
and humidity are high, use additional field-supplied
insulation to prevent condensa-
tion.
_
opper
prpe
Fig. 1
Good
90°
I
Nogood
i
\
Tilted
Uneven Burred
Fig. 2
Burr
Copper
pipe
are
reamer
Pipe
cutter
Fig. 3
Flaring tool
____
_utchtype
Wing nut type
Fig. 4
Smooth all around
Inside is shin-
\
/
ing without any
scratches.
Even length
///_)
alt around
_
Fig. 6
A
Die _
,j_
-
Copper prpe
/
Flare nut
Fig. 5
4-1. PURGING
PROCEDURES
AND LEAK TEST
t) Remove service port cap of stop valve on the side of the outdoor unit gas pipe.
2) Connect gauge manifold
valve and vacuum pump to service port of stop valve on the
gas pipe side of the outdoor unit.
3) Run the vacuum pump 15 minutes or more.
4) Check the vacuum with the gauge manifold valve, then close it and shut off the vacuum
pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge manifold valve remains
in the same position. Confirm that pressure
gauge shows
0.101 MPa [Gauge] ( 30
in.Hg [-760 mmHg]).
6) Quickly remove gauge manifold valve from service port of stop valve.
7) After refrigerant
pipes are connected
and evacuated,
fully open all stop valves on both
sides of gas pipe and liquid pipe. Operating
the unit without fully opening
the valves
lowers the performance
and causes problems.
8) Refer to t-3.
SPECIFICATIONS,
and charge the prescribed
amount of refrigerant
if
needed. Be sure to charge slowly with liquid refrigerant.
Otherwise,
composition
of the
refrigerant in the system may be changed and affect performance
of the air conditioner.
9) Tighten cap of service port.
10) Conduct a leak test
0.101 MPa
*4 to 5 turns
Stop valve cap
(-30 in.Hg
(Torque 19.6 to
[-760 mmHg])
*Close
29.4 N.m, 200
Stop valve
*Open _-*
[1
to 300 kgf.cm)
for LIQUID
Handle
Low
Hexagonal wrench
Stop valve fol
Service
port cap
(Torque
13.7 to
17.7 N.m, 140 to
Adapter for pre-
180 kgf.cm)
venting the back
flow
Compound
pressure gauge
(for R410A)
Pressure gauge
€"(for R410A)
Gauge manifold valve
(for R410A)
Handle High
Charge
hose
(for R410A)
Vacuum
pump (or the vacuum
pump with the function to
prevent
the back flow)
-Precautions
when usin
the control valve] When attachinq the control valve
to the service
ort valve core ma
deform or loosen if excess
is applied. This ma cause
as leak.
A
Control valve
port
Close
Charge hose
Body
When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten partA. Do not tighten
partA or turn the body when valve
core is in open position.
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