Daikin ATXG25EV1B, Installation Manual

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English 10
Refrigerant Piping Work
1.
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
1) Do not use mineral oil on flared part.
2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
3) Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
4) Do never install a drier to this R410A unit in order to guarantee its lifetime.
5) The drying material may dissolve and damage the system.
6) Incomplete flaring may cause refrigerant gas leakage.
2.
Refrigerant piping
1) 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.
• Use torque wrenches when tightening the flare nuts
to prevent damage to the flare nuts and escaping
gas.
2) To prevent gas leakage, apply refrigeration machine oil on both inner and outer surfaces of the flare. (Use refrigeration oil
for R410A.)
2-1. Caution on Piping Handling
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible. Use a pipe bender
for bending.
(Bending radius should be 30 to 40mm or larger.)
(Cut exactly at
right angles.) Remove burrs
A
A 0-0.5mm 1.0-1.5mm 1.5-2.0mm
Set exactly at the position shown below.
Clutch-type
Flare tool for R410A
Clutch-type (Rigid-type) Wing-nut type (Imperial-type)
Conventional flare tool
Flaring
Die
Flare’s inner
surface must
be flaw-free.
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Check
Flare nut tightening torque
Gas side Liquid side
3/8 inch 1/2 inch 1/4 inch
32.7-39.9N l m 49.5-60.3N l m 14.2-17.2N l m
(333-407kgf
l
cm) (505-615kgf
l
cm) (144-175kgf
l
cm)
Coat here with refrigeration machine oil
Torque wrench
Piping union
Flare nut
Spanner
Wall
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Be sure to
place a cap.
Rain
01_EN_3P166464-1.fm Page 10 Saturday, September 17, 2005 11:08 AM