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Toshiba
–13–
Outdoor Unit
Installation Manual
Tightening of Flare
Connections
1. Align the centers of the flare connections and fully
tighten the flare nuts with your fingers.
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)
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
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.
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)
Flare nut
Loosened
Tightened
Piping valve
Cap
Valve at liquid side
Cover
Piping valve
Cap
Tightened
Flare nut
Loosened
Valve at gas side
Charge orifice
Do not apply refrigerant oil to the flared
surface.
Cover
NO GOOD
Charge orifice
13-EN
+00EH99865401_00Ta.book Page 13 Wednesday, November 25, 2009 11:19 AM