Flaring The Pipe End; Refrigerant Piping - McQuay E Serie Manual Del Usuario

01_EN_3P257187-2A.fm Page 5 Saturday, October 31, 2009 10:02 AM
3.

Flaring the pipe end

1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing
downward so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Do never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
4.

Refrigerant piping

CAUTION
• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)
• Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.
Do not apply refrigeration
oil to the outer surface.
Flare nut
Do not apply refrigeration
oil to the flare nut avoid
tightening with over torque.
■English
[Apply oil]
Apply refrigeration oil to
the inner surface of the
flare.
Flare nut tightening torque
Gas side Liquid side
3/8 inch 1/4 inch
32.7-39.9N m 14.2-17.2N m
(333-407kgf cm) (144-175kgf cm)
(Cut exactly at
right angles.)
Flaring
Set exactly at the position shown below.
A Flare tool for R410A
Clutch-type
A 0-0.5mm
Die
[Tighten]
Torque wrench
Spanner
Piping union
Flare nut
Valve cap tightening torque
Gas side
3/8 inch
21.6-27.4N m 21.6-27.4N m
(220-280kgf cm) (220-280kgf cm)
Service port cap 10.8-14.7N m
tightening torque (110-150kgf cm)
Remove burrs.
Conventional flare tool
Clutch-type (Rigid-type) Wing-nut type (Imperial-type)
1.0-1.5mm 1.5-2.0mm
Check
The pipe end must
Flare's inner
be evenly flared in
surface must
a perfect circle.
be flaw-free.
Make sure that the
flare nut is fitted.
Liquid side
1/4 inch
5