Precautions During Brazing; Connecting Tubing Between Indoor And Outdoor Units; Insulating The Refrigerant Tubing - Sanyo PNR-XS2432 Installation Instructions Manual

7-4. 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.
7-5. Connecting Tubing between Indoor and
Outdoor Units
(1) Tightly connect the indoor side refrigerant tubing
with the outdoor side tubing. (Fig. 7-6)
(2) To fasten the flare nuts, apply specified torque as:
Table 7-1
Tube Dia.
1/4" (6.35 mm)
5/8" (15.88 mm)

7-6. Insulating the Refrigerant Tubing

Always insulate tubes after
CAUTION
completing leak tests on all
connection points.
Important
To avoid condensation and water leaks, the wide and
narrow tubes must be insulated with the supplied
insulation materials.
Taping the flare nuts
Wind white insulation tape around the flare nuts at the
wide and narrow 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. 7-7)
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-
CAUTION lated, never try to bend it
because it can cause the
tube to break or crack.
Tightening Torque
Approx. 140 — 180 kg-cm
(120 — 160 Ibs-in.)
Approx. 680 — 820 kg-cm
(590 — 710 lbs-in.)
Torque wrench
Indoor unit
Refrigerant tubing
Seal (supplied)
Insulation tape (white)
Unit side
insulator
Flare nut
Vinyl clamps (supplied)
Drain insulator
Drain pipe and insulator
and clamp.
(not supplied)
Large
(supplied)
Packing
clamp.
Small
hose band
(supplied)
Never grasp the drain or refrigerant connecting
outlets when moving the unit.
22
S4359128
Spanner
Outdoor unit
0131_C_I
Fig. 7-6
(supplied)
Flare insulator (supplied)
Tube insulator
(not supplied)
Fig. 7-7
Refrigerant tubing and insulator
(not supplied)
Insulation
tape
Vinyl
Flare
clamp
insulator
Seal
0558_X_I
Fig. 7-8
1015_X_I