Fujitsu Airstage J-II Series Design & Technical Manual page 596

z Restriction when install
„
Be sure following restriction.
1) Installation angle
Place the separation tubes horizontally or vertically so that the refrigerant separates evenly.
Good
Horizontal
● If it is placed horizontally, keep it within ± 15°. Otherwise, it will not separate the refrigerant evenly, causing a reduction
in performance.
Prohibited
Good: ±15°
Prohibited
● During piping work, apply nitrogen gas while brazing the pipes. If pipes are brazed without applying nitrogen gas, it will
create a large amount of oxidation film, which will cause a critical malfunction.
● To prevent moisture or foreign matter from entering during work, do not leave the piping open.
● Refer to the Installation Manual supplied with the outdoor unit for airtightness test and evacuation procedures.
2) Straight pipe length
A straight pipe (minimum length 2 ft. (0.5 m)) before separation tube is necessary in order to
separation the refrigerant exactly.
2ft. (0.5 m) or more
Main pipe
To indoor unit
Keep the distance 2 ft. (0.5 m) or more for straight part to separation tube, in order to prevent the
outdoor unit mulfunction and generation of refrigerant noise
About the connecting curvature of field pipe and separation tube:
The field pipe should be connected to the branch kit so that the curved angle on each side is 3
degree or less.
A
*: Allowed value based on "A" (center of field pipe) at 2 ft. (0.5 m) from "B" (junction of the separation tube).
Good Prohibited
Vertical
CAUTION
To indoor unit
To indoor unit or to
separation tube or
to header
CAUTION
B
2 ft. (0.5 m)
- (06 - 32) -
Prohibited
2 ft. (0.5 m) or more
To indoor unit
To indoor unit or to
separation tube or
to header