9
English
CAUTION
For local insulation, be sure to insulate all the way to the
pipe connections inside the machine.
Exposed piping may cause leaking or burns on contact.
6-2 For upward and rightward running pipes
• Upward and rightward running pipes are easily rigged with
the optional connecting elbow kit.
• For upward running pipes, detach the pipe hole cover.
• Once pipes are rigged, cut the pipe hole cover to size and
reattach. Use scissors for cutting.
(Refer to Fig. 24)
Since there exists a possibility that small animals and insects
might get inside the indoor unit, attach the wiring through
covers and make sure there are no gaps in the through holes
by applying putty or insulation (procured locally.)
• When doing this, block any gaps between the piping penetra-
tion lid and the pipes using putty to prevent dust from enter-
ing the indoor unit.
CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGER-
ANT PIPING
“Do not use flux when brazing refrigerant piping. Therefore,
use the phosphor copper brazing filler metal (BCuP-2: JIS Z
3264/B-Cu93P-710/795: ISO 3677) which does not require
flux.”
(Flux has extremely harmful influence on refrigerant piping
systems. For instance, if the chlorine based flux is used, it
will cause pipe corrosion or, in particular, if the flux contains
fluorine, it will damage the refrigerant oil.)
• Before brazing local refrigerant piping, nitrogen gas shall be
blown through the piping to expel air from the piping.
If you brazing is done without nitrogen gas blowing, a large
amount of oxide film develops inside the piping, and could
cause system malfunction.
• When brazing the refrigerant piping, only begin brazing after
having carried out nitrogen substitution or while inserting
nitrogen into the refrigerant piping. Once this is done, con-
nect the indoor unit with a flared or a flanged connection.
• Nitrogen should be set to 0.02MPa with a pressure-reducing
valve if brazing while inserting nitrogen into the piping.
(Refer to Fig. 25)
Fig. 25
7.
DRAIN PIPING WORK
7-1 Rig drain piping (Refer to Fig. 26)
As for drain work, perform piping in such a manner that
water can be drained properly.
As for drain piping, the connection can be made from three
different directions.
• Employ a pipe with either the same diameter or with the
diameter larger (excluding the raising section) than that
of the connecting pipe (PVC pipe, nominal diameter
20mm, outside diameter 26mm).
• Keep the drain pipe short and sloping downwards at a
gradient of at least 1/100 to prevent air pockets from
forming.
(Refer to Fig. 27)
CAUTION
Water pooling in the drainage piping can cause the drain to
clog.
• To keep the drain hose from sagging, space hanging wiring
every 1 to 1.5m.
(Refer to Fig. 26)
• Use only the included drain hose (1), (for rightward running
drain hose) or elbow (9) (for upward running drain hose) and
clamp (2).
• Fit the drain hose (1) or elbow (9) over the drain piping up to
the neck and fasten tight with the clamp (2).
• Tighten the clamp (2) until the screw head is less than 4mm
from the hose.
• Insulate the clamp (2) and drain hose or elbow (9) with the
included sealing pad (8).
(Refer to Fig. 28)
• Make sure that heat insulation work is executed on the fol-
lowing 2 spots to prevent any possible water leakage due to
dew condensation.
• Insulate the drain hose inside the building
• Drain socket
Pipe hole cover
For liquid pipe
For gas pipe
For wiring
Fig. 24
For drain pipe
Nitrogen
Pressure-reducing valve
Hands valve
Taping
Refrigerant piping
Part to be
brazed
Nitrogen
1 - 1.5 m
VP20
VP20
Drain hose
(Procure in field.)
Drain hose (1) (For VP20 connection)
≤
500
Clamp (2)
Notes on upward running drain hose
Fig. 26
Ceiling slab
Hanger
bracket
Elbow (9)
Sealing pad (8)
Min. 1/100 gradient
Rear running pipe
GOOD
WRONG
Fig. 27
Right running drain hose
01_EN_3P249378-5G.fm Page 9 Friday, January 20, 2012 2:01 PM
