Precautions During Brazing; Connecting Tubing Between Indoor And Outdoor; Insulating The Refrigerant Tubing - Sanyo CH2442 Installation Instructions Manual

10-4. Precautions during Brazing

Replace air inside the tube with nitrogen gas to
prevent copper oxide film from forming during the
brazing process.
Do not allow the tubing to get too hot during the
brazing process.
The nitrogen gas inside the tubing may overheat,
causing refrigerant system valves to become
damaged. Therefore allow the tubing to cool be-
tween brazings.
10-5. Connecting Tubing between Indoor and
Outdoor Units
(1) Tightly connect the indoor side refrigerant tubing
with the outdoor side tubing. (Fig. 10-6)
(2) To fasten the flare nuts, apply specified torque as:
Table 10-1
Tube Dia.
1/4" (6.35 mm)
3/8" (9.52 mm)
3/4" (19.05 mm)

10-6. Insulating the Refrigerant Tubing

Always insulate tubes after
CAUTION
draining water and complet-
ing leak tests on all connec-
tion points.
Important
To avoid condensation and water leaks, the wide tube
(gas line) must be insulated with the supplied insula-
tion materials.
Taping the flare nuts
Wind white insulation tape around the flare nuts at the
wide tube connections. Place the seal (supplied) on
the unit. Then cover up the tubing connections with the
flare nut insulator, and cover the gap at the union with
the supplied black insulation tape. Finally, fix the
insulator at both ends with vinyl clamps. (Fig. 10-8)
Insulation material
The material used for insulation must have good
insuIation characteristics, be easy to use, be age
resistant, and must not easily absorb moisture.
After a tube has been insu-
lated, never try to bend it
CAUTION
into a narrow curve because
it can cause the tube to
break or crack.
Tightening Torque
Approx. 120 — 160 Ibs-in.
(140 — 180 kg-cm)
Approx. 300 — 360 lbs-in.
(340 — 420 kg-cm)
Approx. 870 — 1040 lbs-in.
(1000 — 1200 kg-cm)
Torque wrench
Indoor unit
Thickness:
Min. 5/16 in.
Wide tube
Refrigerant tubing
Seal (supplied)
Insulation tape (white)
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
Drain insulator
and clamp.
Large
(supplied)
Packing
clamp.
Small
hose band
(supplied)
Never grasp the drain or refrigerant connecting
outlets when moving the unit.
80
S4359146
Spanner
Outdoor unit
0131_C_I
Fig. 10-6
Insulation
Thickness:
Min. 5/16 in.
Narrow tube
0999_C_I
Fig. 10-7
(supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Fig. 10-8
Refrigerant tubing and insulator
(not supplied)
Drain pipe and insulator
(not supplied)
Insulation
tape
Vinyl
Flare
clamp
insulator
Seal
Fig. 10-9
1015_X_I
1373_X_I