Outdoor Unit
Tightening of Flare Connections
1.Align the centers of the flare connections and fully tighten the flare nuts with your fingers.
Valve at liquid side
Cap
Loosened | Piping valve |
Tightened
Flare nut
2.Use two wrenches to loosen or tighten the flare nut on the gas service valve as shown in the figure. Use only one wrench to loosen or tighten the flare not on the liquid service valve.
The final tightening with a torque wrench should be to the specifications shown in table below.
| Unit : ft•lbs (N•m) |
Outer diameter of copper pipe | Tightening torque |
3/8” (9.5 mm) | 24 - 31 (33 - 42) |
5/8” (15.9 mm) | 50 - 60 (68 - 82) |
Valve at gas side | Cover |
| |
Cap | Piping valve |
| |
Charge orifice |
|
| Flare nut |
| Tightened |
Loosened |
|
Installation Manual
•After the installation work, be sure to check for gas leaks of the pipe connections with nitrogen.
NO GOOD
Cover
Charge orifice
CAUTION
1.Do not put the crescent wrench on the charge orifice or cover.
The valve may be broken.
2.If applying excessive torque, the nut may break according to some installation conditions.
•Pressure of R410A is higher than that of R22 (Approx. 1.6 times).
Therefore, using a torque wrench, tighten the flare pipe connecting sections that connect the indoor/ outdoor units at the specified tightening torque.
Incomplete connections may cause not only a gas leak, but also trouble with the refrigeration cycle.
Do not apply refrigerant oil to the flared surface.
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