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INSTALLATION
24
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
Ø9.52
Ø12.7
Ø15.88
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.
tightening torque(N·cm)
38±4
55±6
75±7
A(mm)
12.8-13.2
16.2-16.6
19.3-19.7
flare shape
90
2
A
R=0.4~0.8
Union
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