Daikin SkyAir SkyAir FHQ42MVJU, Installation Manual

Page: 8 / 16

8
Table 3
After the work is finished, make sure to check that there
is no gas leak.
6-3 BRAZING REFRIGERANT PIPING
CAUTION
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT
PIPING
“Do not use flux when brazing refrigerant pipe. Therefore, use
the phosphor copper brazing filler metal (BCuP) which does not
require flux.”
(Flux has an extremely negative effect on refrigerant piping sys-
tems. For instance, if chlorine based flux is used, it will cause
pipe corrosion. If the flux contains fluorine, it will damage the
refrigerant oil.)
• Before brazing local refrigerant pipe, nitrogen gas shall be
blown through the pipe to expel air from the pipe.
If you brazing is done without nitrogen gas blowing, a large
amount of oxide film develops inside the pipe, and could
cause system malfunction.
• When brazing the refrigerant pipe, only begin brazing after
having carried out nitrogen substitution or while inserting
nitrogen into the refrigerant pipe. Once this is done, connect
the indoor unit with a flared or a flanged connection.
• Nitrogen should be set to 2.9 psi with a pressure-reducing
valve if brazing while inserting nitrogen into the pipe.
(Refer to Fig. 15)
DANGER
• Use of oxygen may cause an explosion resulting in serious
injury or death. Only use nitrogen gas.
CAUTION
• Be sure to insulate any field piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensate or a burn if touched.
6-4 PIPING INSULATION
• Make absolutely sure to execute thermal insulation works on
the pipe-connecting section after checking gas leakage by
thoroughly studying the following figure and using the insula-
tion pipe cover (6) and (7). (Fasten both ends with the clamps
(4).)
(Refer to Fig. 16)
• Wrap the small sealing pad (9) only around the insulation for
the joints on the gas piping side. (Refer to Fig. 16)
(1) For piping facing back.
• Remove the rear metal plate for pipe. (Refer to Fig. 17)
• The figure of the direction of back shows when both the pip-
ing and drain pipe are set backward.
When setting the piping to face up or right, attach the rear
metal plate for refrigerant pipe and plug a hole for drain pipe.
(See “4 PREPARATIONS BEFORE INSTALLATION” (3-3) on
page 6)
(2) For piping facing up.
• When setting the piping to face up, the L-shaped branch pipe
kit sold separately is required.
• Removing the top penetration lid and use the L-shaped branch
pipe kit sold separately to set the pipe. (Refer to Fig. 18, 19)
(3) For piping facing right.
• Cut out a slit hole on the decoration panel (right) and set the
pipe. (Refer to Fig. 17)
Pipe size
(in.)
Further tightening angle
Recommended arm length of tool
(in.)
φ
3/8 60 to 90 degrees Approx. 7 7/8
φ
5/8 30 to 60 degrees Approx. 11 13/16
Refrigerant pipe
Part to be
brazed
Taping
Pressure-reducing
valve
hands valve
Nitrogen
Nitrogen
Fig. 15
Insulation pipe cover for gas pipe (6)
Gas pipe
Liquid pipe
Insulation pipe cover for liquid pipe (7)
Clamp (4) (× 4)
Attach to the bottom
(For both gas pipe and liquid pipe)
Procedure for thermal insulation of liquid-side pipe
Insulation pipe cover for
liquid pipe (7)
Orient so that the end of
the wrapped insulation
material is facing up
Flare nut connection
Insulation pipe cover (main unit)
Attach to base
Main unit
Main unit
Clamp (4)
Clamp (4)
Insulation pipe cover
(Locally procured)
Procedure for thermal insulation of gas-side pipe
Insulation pipe cover
for gas pipe (6)
Insulation pipe
cover (main unit)
Attach to base
Orient so that the end of
the wrapped insulation
pipe cover is facing up
Flare nut connection
Insulation pipe cover
(Locally procured)
Wind around the
pipe, beginning at
the base.
Small sealing
pad (9)
Fig. 16
Right-facing drain pipe
Right-facing
refrigerant
piping
Decoration panel (right) removable part
If only setting the drain pipe to
face right, cut this section only.
Fig. 17
Rear-facing
refrigerant pipe
Rear right-facing
drain pipe