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Toshiba
–12–
Outdoor Unit
Installation Manual
EN
6 REFRIGERANT PIPING
CAUTION
TAKE NOTE OF THESE 4 IMPORTANT
POINTS BELOW FOR PIPING WORK
1. Keep dust and moisture away from inside the
connecting pipes.
2. Tightly connect the connection between pipes
and the unit.
3. Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4. Check for gas leaks at connected points.
Flaring
1. Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2. Insert the supplied flare nut into the pipe, and then
flare the pipe.
As the flaring sizes of R410A differ from those of
refrigerant R22, the flare tools newly manufactured
for R410A are recommended.
However, the conventional tools
can be used by adjusting the
projection margin of the copper
pipe.
▼ Projection margin in flaring : B (Unit : in (mm))
Rigid (Clutch type)
▼ Flaring diameter size : A (Unit : in (mm))
* In case of flaring for R410A with the
conventional flare tool, pull the tool out
approx. 0.02” (0.5 mm) more than that for
R22 to adjust it to the specified flare size.
The copper pipe gauge is useful for
adjusting the projection margin size.
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)
Outer diameter of
copper pipe
R410A tool
used
Conventional
tool used
R410A
0.04” - 0.06”
(1.0 - 1.5)
1/4” (6.4)
0 - 0.02” (0 - 0.5)
1/2” (12.7)
Outer diameter of copper pipe A
1/4” (6.4) 0.39” (9.9)
1/2” (12.7) 0.65” (16.6)
B
+0
-0.02" (–0.4)
A
Outer diameter of copper pipe Tightening torque
1/4” (6.4 mm) 10 - 13 (14 - 18)
1/2” (12.7 mm) 37 - 46 (50 - 62)
Valve at liquid side
Valve at gas side
12-EN
+00EH99865301_00Ta.book Page 12 Wednesday, November 25, 2009 11:05 AM