Installation and operation manual
5
FXFQ20~125AVEB
VRV System air conditioners
3P320142-1A – 2012.10
Piping insulation procedure
Cautions for brazing
■
Be sure to carry out a nitrogen blow when brazing.
Brazing without carrying out nitrogen replacement or releasing
nitrogen into the piping will create large quantities of oxidized
film on the inside of the pipes, adversely affecting valves and
compressors in the refrigerating system and preventing normal
operation.
■
When brazing while inserting nitrogen into the piping, nitrogen
must be set to 0.02 MPa with a pressure-reducing valve (=just
enough so that it can be felt on the skin).
D
RAIN
PIPING
WORK
Installation of drain piping
Install the drain piping as shown in figure and take measures against
condensation. Improperly rigged piping could lead to leaks and
eventually wet furniture and belongings.
■
Install the drain pipes.
-
Keep piping as short as possible and slope it downwards at a
gradient of at least 1/100 so that air may not remain trapped
inside the pipe.
-
Keep pipe size equal to or greater than that of the connecting
pipe (vinyl pipe of 25 mm nominal diameter and 32 mm outer
diameter).
-
Push the supplied drain hose as far as possible over the
drain socket.
-
Tighten the metal clamp until the screw head is less than
4 mm from the metal clamp part as indicated in the
illustration.
-
After the testing of drain piping is finished, attach the drain
sealing pad (4) supplied with the unit over the uncovered part
of the drain socket (= between drain hose and unit body).
-
Wrap the supplied large sealing pad over the metal clamp
and drain hose to insulate and fix it with clamps.
-
Insulate the complete drain piping inside the building (field
supply).
-
If the drain hose cannot be sufficiently set on a slope, fit the
hose with drain raising piping (field supply).
Gas piping
Liquid piping
1
Piping insulation material (field supply)
2
Flare nut connection
3
Insulation for fitting (delivered with the unit)
4
Piping insulation material (main unit)
5
Main unit
6
Clamp (field supply)
7
Medium 1 sealing pad for gas piping (delivered with the unit)
Medium 2 sealing pad for liquid piping (delivered with the unit)
A
Turn seams up
B
Attach to base
C
Tighten the part other than the piping insulation material
D
Wrap over from the base of the unit to the top of the flare nut
connection
■
For local insulation, be sure to insulate local
piping all the way into the pipe connections inside
the unit.
Exposed piping may cause condensation or may
cause burns when touched.
■
Make sure that no oil remains on plastic parts of
the decoration panel (optional equipment).
Oil may cause degradation and damage to the
plastic parts.
1
Refrigerant piping
2
Part to be brazed
3
Taping
4
Hands valve
5
Pressure-reducing valve
6
Nitrogen
A
B
D
C
7
1
2
3
4
5
6
6
A
B
C
1
2
3
4
5
6
6
D
7
1
2
3
4
5
6
6
1
Hanging bar
1
Drain socket (attached to the unit)
2
Drain hose (supplied with the unit)
1
Drain socket (attached to the unit)
2
Drain hose (supplied with the unit)
3
Metal clamp (supplied with the unit)
4
Drain sealing pad (supplied with the unit)
5
Large sealing pad (supplied with the unit)
6
Drain piping (field supply)
1-1.5 m
1
2
1
1
6
2
4
3
5
4 mm
3
5
2
A
A'
A-A'
1
