Refrigerant Piping Work - Daikin CDXS25BVMB Installation Manual

REFRIGERANT PIPING WORK

See the installation manual supplied with the Multi outdoor unit for 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
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 R-410A unit in order to guarantee its lifetime.
The drying material may dissolve and damage the system.
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.
G
Use torque wrenches when tightening the flare nuts to prevent damage to
the flare nuts and escaping gas.
Gas side
3/8 inch
32.7~39.9 N•m 49.5~60.3 N•m
(333~407 kgf•cm) (505~615 kgf•cm)
Gas side
3/8 inch
21.6~27.4 N•m 26.5~32.3 N•m
(220~280 kgf•cm) (270~330 kgf•cm)
Service port cap tightening torque
2. To prevent gas leakage, apply refrigeration machine oil on both inner and
outer surfaces of the flare. (Use refrigeration oil for R-410A)
G
Wrap only the gas line side with the sealing pad. Bend the pad over the
insulation for fitting (union) from above.
5
Flare nut tightening torque
1/2 inch
14.2~17.2 N•m
(144~175 kgf•cm)
Valve cap tightening torque
1/2 inch
21.6~27.4 N•m
(220~280 kgf•cm)
10.8~14.7 N•m (110~150 kgf•cm)
(Cut exactly at
right angles.)
Set exactly at the position shown below.
A
Flare tool for R-410A
Clutch-type
A 0 ~ 0.5 mm
Die
Flare's inner
surface must be
flaw-free.
Liquid side
1/4 inch
Liquid side
1/4 inch
Insulation for fitting
(attached)
(For gas pipe)
Large sealing pad
(attached)
Gas pipe
Remove burrs
Flaring
Conventional flare tool
Clutch-type (Rigid-type) Wing-nut type (Imperial-type)
1.0 ~ 1.5 mm 1.5 ~ 2.0 mm
Check
The pipe end
must be evenly
flared in a
perfect circle.
Make sure that
the flare nut is
fitted.
Coat here with
refrigeration machine oil
Torque wrench
Spanner
Piping union
Flare nut
Liquid pipe
Small sealing pad
(attached)
Insulation for fitting
(attached)
(For liquid pipe)