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FLARE SHAPE and FLARE NUT TIGHTENING TORQUE
Precautions when connecting pipes
• See the following table for flare part machining dimensions.
• When connecting the flare nuts, apply refrigerant oil to the inside and outside of the flares and turn them three
or four times at first. (Use ester oil or ether oil.)
• See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)
• After all the piping has been connected, use nitrogen to perform a gas leak check.
pipe size
tightening torque(Ncm)
Ø9.5
Ø12.7
Ø15.9
CAUTION
• Always use a charge hose for service port connection.
• After tightening the cap, check that no refrigerant leaks are
present.
• When loosening a flare nut, always use two wrenches in
combination, When connecting the piping, always use a spanner
and torque wrench in combination to tighten the flare nut.
• When connecting a flare nut, coat the flare(inner and outer faces)
with oil for R410A(PVE) and hand tighten the nut 3 to 4 turns as
the initial tightening.
Opening shutoff valve
1. Remove the cap and turn the valve counter clockwise with the hexagon wrench.
2. Turn it until the shaft stops.
Do not apply excessive force to the shutoff valve. Doing so may break the valve body, as the valve is not a
backseat type. Always use the special tool.
3. Make sure to tighten the cap securely.
Closing shutoff valve
1. Remove the cap and turn the valve clockwise with the hexagon wrench.
2. Securely tighten the valve until the shaft contacts the main body seal.
3. Make sure to tighten the cap securely.
* For the tightening torque, refer to the table on the below.
Tightening torque
Shutoff
valve size
Shaft(valve body)
Ø6.4
5.4-6.6
Hexagonal
Ø9.5
wrench 4mm
8.1-9.9
Ø12.7
Hexagonal
13.5-16.5
Ø15.9
wrench 6mm
Ø22.2
Hexagonal
27-33
wrench 10mm
Ø25.4
3270-3990
12.8-13.2
4950-6030
16.2-16.6
6180-7540
19.3-19.7
Tightening torque N-m(Turn clockwise to close)
Cap(Valve lid) Service port
13.5-16.5
18-22
23-27
36-44
A(mm)
Flare nut
14-17
33-39
50-60
11.5-13.9
62-75
-
Installation
flare shape
90°
±2
A
R=0.4~0.8
Union
Gas line piping attached to unit
-
22-28
Installation Manual 17
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