Installation and operation manual
5
FXZQ15~50A2VEB
VRV System air conditioners
4P341102-1B – 2013.06
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).
Drain piping work
Installation of drain piping
Install the drain piping as shown in the 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 20 mm nominal diameter and 26 mm outer
diameter).
- Push the supplied drain hose as far as possible over the
drain socket.
- Tighten the metal clamp 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).
How to perform piping
- Connect the drain hose to the drain raising pipes, and
insulate them.
- Connect the drain hose to the drain outlet on the indoor unit,
and tighten it with the clamp.
Precautions
- Install the drain raising pipes at a height of less than H2.
- Install the drain raising pipes at a right angle to the indoor
unit and no more than 300 mm from the unit.
- To prevent air bubbles, install the drain hose level or slightly
tilted up (
≤
75 mm).
- Drain pump mounted in this unit is high lift type.
Characteristic of this pump is that the higher pump is the
lower drainage sound becomes. Therefore drain pump height
of 300mm is recommended.
1
Refrigerant piping
2
Part to be brazed
3
Taping
4
Hands valve
5
Pressure-reducing valve
6
Nitrogen
1
Hanging bar
1
Drain socket (attached to the unit)
2
Drain hose (supplied with the unit)
1
2
3
4
5
6
6
2
1
1
Drain socket (attached to the unit)
2
Drain hose (supplied with the unit)
3
Metal clamp (supplied with the unit)
NOTE: Bend the tip of the metal clamp without tearing
the sealing.
4
Large sealing pad (supplied with the unit)
5
Drain piping (field supply)
1
Ceiling slab
2
Hanger bracket
3
Adjustable range
4
Drain raising pipe (nominal diameter of vinyl pipe = 25 mm)
5
Drain hose (supplied with the unit)
6
Metal clamp (supplied with the unit)
Decoration panel
H2
BYFQ60C
645 mm
BYFQ60B
630 mm
NOTE
The incline of attached drain hose should be
75 mm or less so that the drain socket does
not have to withstand additional force.
To ensure a downward slope of 1:100, install
hanging bars every 1 to 1.5 m.
When unifying multiple drain pipes, install the
pipes as shown in
. Select converging
drain pipes whose gauge is suitable for the
operating capacity of the unit.
1
T-joint converging drain pipes
1
5
2
3
4
3
4
2
A
A'
A-A'
1
