Service manual

– 58 –
Tightening Connection
Align the centers of the connecting pipes and tighten
the flare nut as much as possible with your fingers.
Then tighten the nut with a wrench and torque
wrench as shown in the figure.
Fig. 10-5-7
CAUTION
• Do not apply excessive force.
Otherwise, the nut may break.
(Unit : N·m)
Fig. 10-5-8
Half union
Flare nut
Externally
threaded side
Internally
threaded side
Use a wrench
to secure.
Use a torque wrench
to secure.
Flare at
indoor unit side
Flare at
outdoor unit side
Outer dia. of copper pipe
Ø6.35 mm
Ø9.52 mm
Ø12.7 mm
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)
All combinations that do not exceed the “Total”
number can be installed.
Note that expanders and reducers may be required
depending on the combination method.
Outdoor unit
Indoor unit
Unit A
Ø9.52
Ø6.35
Unit B
Unit C
Ø9.52
Ø6.35
Ø12.7
Ø6.35
• Tightening torque for connection of flare pipe
The pressure of R410A is higher than R22.
(Approx. 1.6 times.) Therefore securely tighten the
flare pipes which connect the outdoor unit and the
indoor unit with the specified tightening torque
using a torque wrench.
If any flare pipe is incorrectly connected, it may
cause not only a gas leakage but also
trouble in the refrigeration cycle.
Fig. 10-5-9
RAS-
3M23GACV-E
Connectable capacity class
A B C Total
10 10 10
(with reducer)
13 13 13
36
(with reducer)
16 16 16
(with expander) (with expander)