Balcar R410A Manual De Usuario

– 26 –

(Unit: N•m)

Externally
threaded side

Internally
threaded side

Fix with spanner.

Tighten with torque wrench.

Half union or packed valve

Flare nut

Flare at 

indoor unit side

Flare at 

outdoor unit side

• 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.

Cover

Cap

Piping valve

Tightened

Flare nut

Loosened

• 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.

Cover

• 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 speci-
fied tightening torque. Incomplete connections may
cause not only a gas leak, but also a trouble of the
refrigeration cycle.

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 conditions.

• After the installation work, be sure to check gas leak

of connecting part of the pipes with nitrogen.

  6.4 mm (diam.)

  9.5 mm (diam.)

12.7 mm (diam.)

15.9 mm (diam.)

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)