Daikin R32 Split Series Installation Manual page 8

OUTDOOR UNIT INSTALLATION
Install as described in the installation manual supplied with the outdoor unit.
REFRIGERANT PIPING WORK
See the installation manual supplied with the outdoor unit.
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 Warning 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.
Never install a dryer to this R32 unit in order to guarantee its lifetime.
The drying material may dissolve and damage the system.
Incomplete flaring may cause refrigerant gas leakage.
Do not reuse joints which have been used once already.
2. REFRIGERANT PIPING
1) To prevent gas leakage, apply refrigeration machine oil on both
inner and outer surfaces of the flare. (Use refrigeration oil for R32)
2) 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.
Caution
Overtightening may damage the flare and cause leaks.
6
(Cut exactly at right angles.)
Set exactly at the position shown below.
A
Flare tool for R32
Clutch-type
A 0-0.5mm
Die
Flare's inner surface
must be flaw-free.
Ø9.5
33-39N•m
Remove burrs
Flaring
Conventional flare tool
Clutch-type (Ridgid-type) Wing-nut type (Imperial-type)
1.0-1.5mm 1.5-2.0mm
Check
The pipe end must
be evenly flared in a
perfect circle.
Make sure that the
flare nut is fitted.
Flare nut tightening torque
Gas side Liquid side
Ø12.7
50-60N•m 15-17N•m
Ø6.4
English