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Toshiba MCY-MAP0501HT2D Manual

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9
Tightening of connecting part
(Unit: N•m)
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
conditions.
• After the installation work, be sure to check gas leak
of connecting part of the pipes with nitrogen.
• 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.
• 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.
Outer dia. of copper pipe
9.5 mm (diam.)
15.9 mm (diam.)
Tightening torque
33 to 42 (3.3 to 4.2 kgf•m)
68 to 82 (6.8 to 8.2 kgf•m)
Valve at gas side
• 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.
Externally
threaded side
Internally
threaded side
Fix with spanner.
Tighten with torque wrench.
Half union or packed valve Flare nut
Cover
Cap
Piping valve
Tightened
Flare nut
Loosened
Cover
NO GOOD
3
REFRIGERANT PIPING
… 12 …


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