Toshiba RAV-SM563AT-E Installation Manual page 10

4
REFRIGERANT PIPING
Tightening of Connecting Part
Outer diam. of copper pipe
6.4 mm (diam.)
9.5 mm (diam.)
12.7 mm (diam.)
15.9 mm (diam.)
• Align the centers of the connecting pipes and
tighten the flare nut strong as far as possible with
your fingers.
Then fix the nut with a spanner and tighten it with
torque wrench as shown in the figure.
Half union or packed valve
Externally
threaded side
Fix with spanner.
• As shown in the figure, be sure to use a double
spanner to loosen or tighten the flare nut of the
valve at gas side. If using a single spanner, the nut
cannot be tightened with necessary tightening
torque.
On the contrary, use a single spanner to loosen or
tighten the flare nut of the valve at liquid side.
Spanner
for fixing
Cap
SM80 type valve at gas side
(Unit: N•m)
Tightening torque
14 to 18 (1.4 to 1.8 kgf•m)
33 to 42 (3.3 to 4.2 kgf•m)
50 to 62 (5.0 to 6.2 kgf•m)
68 to 82 (6.8 to 8.2 kgf•m)
Flare at
indoor unit side
Flare at
outdoor unit side
Flare nut
Internally
threaded side
Tighten with torque wrench.
Flare nut
Spanner for work
Loosened
Tightened
REQUIREMENT
1. Do not put the spanner on the cap. The valve
may be broken.
2. If applying excessive torque, the nut may be
broken according to some installation condi-
tions.
• After the installation work, be sure to check gas
leak of connecting part of the pipes with nitrogen.
NO GOOD
• Pressure of R410A is higher than that of R22
(Approx. 1.6 times). Therefore, using a torque
wrench, tighten the flare pipe connecting sections
which connect the indoor/outdoor units at the
specified tightening torque. Incomplete connections
may cause not only a gas leak, but also a trouble of
the refrigeration cycle.
Do not apply refrigerating machine oil to
the flared surface.
7
Single spanner
is prohibited