5
English
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 2.9 psi (0.02 MPa) with a pressure-reducing valve (=just
enough so that it can be felt on the skin).
1
2
3
4
5
6
6
1
Refrigerant piping
2
Part to be brazed
3
Taping
4
Hand valve
5
Pressure-reducing valve
6
Nitrogen
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.
40-60 in.
(1-1.5 m)
1
1
Suspension bolt
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 13/16 in. (20 mm) nominal diameter and
1 in. (25 mm) outer diameter, without vertical rise pipe).
- Push the supplied drain hose as far as possible over the drain
socket.
2
1
1
Drain socket (attached to the unit)
2
Drain hose (supplied with the unit)
- 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).
1
5
2
3
4
3
4
2
A
A'
A-A'
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 to avoid tearing the sealing.
4
Large sealing pad (supplied with the unit)
5
Drain piping (field supply)
- 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 (See figure 6)
1
Ceiling slab
2
Suspension bolt
3
Adjustable range
4
Drain raising pipe (nominal diameter of vinyl pipe =1 in. (25 mm))
5
Drain hose (supplied with the unit)
6
Metal clamp (supplied with the unit)
- Connect the drain hose to the drain raising pipe, and insulate
them.
- Connect the drain hose to the drain socket of the unit, and tighten
it with the clamp.
Precautions
- Install the drain raising pipe at a height of less than H2.
- Install the drain raising pipe at a right angle to the unit and no
more than 11-3/4 in. (300 mm) from the unit.
- To prevent air bubbles, install the drain hose level or slightly tilted
up (≤3 in. (≤75 mm)).
- Drain pump mounted in the unit is high lift type. Characteristic of
this pump is that the higher lifting height, the lower drainage
sound. Therefore drain lifting height of 11-3/4 in. (300 mm) or
more is recommended.
Decoration panel
H2
BYFQ60C3
24-13/16 in. (630 mm)
BYFQ60B3
25-3/8 in. (645 mm)
01_EN_3P493125-3C.indd 5
2021/12/09 11:43:30
