Drain Piping Work - Daikin FCQ18PVJU Installation Manual

CAUTION
• Be sure to insulate any fi eld piping all the way to the piping
connection inside the unit. Any exposed pipe may cause
condensate or burns if touched.
7-4 Brazing refrigerant piping
• Before brazing local refrigerant pipe, nitrogen gas shall be
blown through the pipe to expel air from the pipe.
If your brazing is done without nitrogen gas blowing, a large
amount of oxide fi lm 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 fl ared or a fl anged connection.
• Nitrogen should be set to 2.9psi. with a pressure-reducing
valve if brazing while inserting nitrogen into the pipe.
Refrigerant
pipe
Part to be
brazed
Nitrogen
DANGER
• Use of oxygen may cause an explosion resulting in serious
injury or death. Only use nitrogen gas.
NOTE
• Do not use fl ux when brazing refrigerant pipe. Therefore,
use the phosphor copper brazing fi ller metal (BCuP) which
does not require fl ux.
(Flux has an extremely negative effect on refrigerant piping
systems. For instance, if chlorine based fl ux is used, it will
cause pipe corrosion. If the fl ux contains fl uorine, it will
damage the refrigerant oil.)
8.

DRAIN PIPING WORK

〈〈Rig the drain pipe as shown below and take measures
against condensate. Improperly rigged pipe could lead to
leak and eventually wet furniture and belongings.〉〉
(1) Rig drain pipe
• The diameter of the drain pipe should be greater than or
equal to the diameter of the connecting pipe (vinyl tube;
pipe size: 1 in.; outer dimension: 1 1/4 in.). (This does not
apply to rise.)
• Keep the drain pipe short and sloping downwards at a
gradient of at least 1/100 to prevent air pockets from form-
ing.
• If the drain pipe cannot be suffi ciently set on a slope, ex-
ecute the drain raising pipe.
• To keep the drain pipe from sagging, space hanging wires
every 3.28 ~ 4.92ft.
English
Pressurereducing valve
Taping
Hands
valve
Nitrogen
3.28 - 4.92ft.
• Use the attached drain hose (1) and metal clamp (2).
Insert the drain hose into the drain socket, up to the white
tape. Tighten the clamp until the screw head is less than
3/16 in. from the hose.
• Be sure to insulate the 2 below indicated spots.
If uninsulated, there is always the possibility of con-
densate forming and leaking.
• The drain pipe inside the building
• Drain socket
• Wrap the attached sealing pad (10) (Large) over the clamp
and drain hose to insulate, as shown in the drawing below.
Metal clamp (2)
(accessory)
Tape (White)
Metal clamp (2)
(accessory)
〈NOTE FOR DRAIN RAISING PIPE〉
• Install the drain raising pipe at a height of less than 21 5/8 in.
• Install the drain raising pipe at a right angle to the indoor
unit and no more than 11 13/16 in. from the unit.
Ceiling slab
11 13/16 or less
Clamp metal (2) (accessory)
Drain hose (1) (accessory)
1/100 gradient
or more
Drain hose (1)
(accessory)
Large sealing pad (10)
(accessory)
3/16 or less
(length: in.)
Adjustable
3.28-4.92ft.
Suspention bolt
(21 5/8 or less)
Drain raising pipe
Rise
(length: in.)
8