En-5
3-2. PIPE CONNECTION
1) Apply a thin coat of refrigeration oil (
*
) to the
À
ared ends of the pipes and the
pipe connections of the outdoor unit.
2) Align the center of the pipe with that of the pipe connections of the outdoor unit,
then hand tighten the
À
are nut 3 to 4 turns.
3) Tighten the
À
are nut with a torque wrench as speci
¿
ed in the table.
O
Y
er-tightening may cause damage to the
À
are nut, resulting in refrigerant
lea
N
age.
%
e sure to wrap insulation around the piping. Direct contact with the bare piping
may result in burns or frostbite.
3-3. INSULATION AND TAPING
1) Co
Y
er piping joints with pipe co
Y
er.
2) For outdoor unit side, surely insulate e
Y
ery piping including
Y
al
Y
es.
3) Using piping tape (E), apply taping starting from the entry of outdoor unit.
Stop the end of piping tape (E) with tape (with adhesi
Y
e agent attached).
When piping ha
Y
e to be arranged through abo
Y
e ceiling, closet or where the
temperature and humidity are high, wind additional commercially sold insulation
to pre
Y
ent condensation.
WARNING
When installing the unit, securely
connect the refrigerant pipes before
starting the compressor.
CAUTION
When there are the ports which are
not used, make sure their nuts are
tightened securely.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Tilted Une
Y
en
%
urred
*
ood
No good
%
urr Copper pipe
Spare reamer
Pipe cutter
Smooth all
around
E
Y
en length
all around
Inside is shin-
ing without any
scratches.
B
Flare nut
Die
Copper pipe
Clutch type
Flaring tool
Wing nut type
Copper
pipe
Pipe diameter
[inch (mm)]
%
[inch (mm)]
A [inch (mm)]
Tightening torque
Clutch type tool for R410A Clutch type tool for R22
Wing nut type tool for R22
ft-Ib
N
m
N
gf
cm
1/4 (ø6.35)
21/32 (17)
0 to 0.02
(0 to 0.5)
0.04 to 0.06
(1.0 to 1.5)
0.06 to 0.08
(1.5 to 2.0)
10 to 13
13.7 to 17.7
140 to 180
3/8 (ø9.52)
7/8 (22)
25 to 30
34.3 to 41.2
350 to 420
1/2 (ø12.7)
1-1/32 (26)
0.08 to 1.0
(2.0 to 2.5)
36 to 42
49.0 to 56.4
500 to 575
5/8 (ø15.88)
1-5/32 (29)
54 to 58
73.5 to 78.4
750 to 800
3-1. FLARING WORK
1) Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2) Completely remo
Y
e all burrs from the cut cross section of
pipe. (Fig. 3)
Aim the copper pipe downward while remo
Y
ing burrs to
pre
Y
ent burrs from dropping in the pipe.
3) Remo
Y
e
À
are nuts attached to indoor and outdoor units,
then put them on pipe ha
Y
ing completed burr remo
Y
al.
(Not possible to put them on after
À
aring wor
N
.)
4) Flaring wor
N
(Fig. 4, 5). Firmly hold copper pipe in the
dimension shown in the table. Select A inch (mm) from
the table according to the tool selected.
5) Chec
N
Compare the
À
ared wor
N
with Fig. 6.
If
À
are is noted to be defecti
Y
e, cut off the
À
ared section
and do
À
aring wor
N
again.
4-1. PURGING PROCEDURES AND LEAK TEST
1) Remo
Y
e ser
Y
ice port cap of stop
Y
al
Y
e on the side of the outdoor unit gas pipe. (The
stop
Y
al
Y
es are fully closed and co
Y
ered in caps in their initial state.)
2) Connect gauge manifold
Y
al
Y
e and
Y
acuum pump to ser
Y
ice port of stop
Y
al
Y
e on
the side of the outdoor unit gas pipe.
3) Run the
Y
acuum pump. (
9
acuumize for more than 15 minutes.)
4) Chec
N
the
Y
acuum with gauge manifold
Y
al
Y
e, then close gauge manifold
Y
al
Y
e,
and stop the
Y
acuum pump.
5) Lea
Y
e as it is for one or two minutes. Ma
N
e sure the pointer of gauge manifold
Y
al
Y
e
remains in the same position. Con
¿
rm that pressure gauge shows -14.7 psi [
*
auge]
(-0.101 MPa).
6) Remo
Y
e gauge manifold
Y
al
Y
e quic
N
ly from ser
Y
ice port of stop
Y
al
Y
e.
7) Fully open all stop
Y
al
Y
es on the gas pipe and the liquid pipe. Operating without
fully opening lowers the performance and this causes trouble.
8) Refer to 1-2., and charge the prescribed amount of refrigerant if needed.
%
e 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 ser
Y
ice port to obtain the initial status.
10) Lea
N
test
*
auge manifold
Y
al
Y
e
(for R410A)
Compound pressure
gauge (for R410A)
+
andle
+
igh
Charge hose
(for R410A)
Pressure gauge
(for R410A)
-14.7 psi
(-0.101 MPa)
+
andle Low
9
acuum pump
(for R410A)
Stop
Y
al
Y
e cap
(Torque 15 to
20 ft-lb, 21.5 to
27.5 N
m, 220
to 280
N
gf
cm)
*Close
*Open
+
exagonal wrench
*4 to 5 turns
Ser
Y
ice port cap
(Torque 7 to 9 ft-lb,
10 to 12 N
m, 100
to 120
N
gf
cm)
Stop
Y
al
Y
e cap
(Torque 18 to
22 ft-lb, 24.4 to
30.4 N
m, 250
to 310
N
gf
cm)
Precautions when us-
ing the control
Y
al
Y
e
When attaching the control
Y
al
Y
e
to the ser
Y
ice port,
Y
al
Y
e core may
deform or loosen if excess pres-
sure is applied. This may cause
gas lea
N
.
Ser
Y
ice port
Charge hose
(for R410A)
%
ody
Close
Open
Control
Y
al
Y
e
A
When attaching the control
Y
al
Y
e to
the ser
Y
ice port, ma
N
e sure that the
Y
al
Y
e core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body when
Y
al
Y
e
core is in open position.
3. FLARING WORK AND PIPE CONNECTION
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
