Drain Piping Work - Daikin FXTQ12PAVJU Installation Manual

CAUTION
• Be sure to insulate any fi eld piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
• When brazing the refrigerant piping, perform nitrogen re-
placement fi rst, or perform the brazing while feeding nitro-
gen into the refrigerant piping. (Refer to Fig. 5)
Part to be brazed
Nitrogen
Refrigerant piping
Fig. 5
CAUTION
• When brazing piping while feeding nitrogen inside the
piping, make sure to set the nitrogen pressure to 2.9 psi or
less using the pressure reducing valve.
(This pressure is such that a breeze is blown to your cheek.)
DANGER
• Use of oxygen could result in an explosion resulting in
serious injury or death. Only use dry nitrogen gas.
• Refrigerant gas may produce toxic gas if it comes in contact
with fi re such as from a fan heater, stove or cooking device.
Exposure to this gas could cause severe injury or death.
NOTE
• Do not use fl ux when brazing refrigerant piping. 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 piping corrosion. Flux containing fl uorine will damage
refrigerant oil.
6.

DRAIN PIPING WORK

CAUTION
• Make sure all water is out before making the duct connection.
7
Pressure-reducing valve
Taping
hands
valve Nitrogen
(1) Install drain piping as described Fig. 6.
In case of vertical installation
Secondary drain piping connection hole
Primary drain piping connection hole
Fig. 6-1
In case of horizontal installation
Fig. 6-2
Primary drain piping connection hole
• Perform drain work so that the unit is drained thoroughly.
(Be sure to insulate the following 2 locations since
condensation may cause water leakage.)
• Drain piping
• Drain socket
• The drain pan has connections for a primary and sec-
ondary drain.
• Use 3/4 PVC piping for drain piping connections.
• Keep piping runs short with a downward slope of at
least 1/100 to prevent air pocket from forming.
• Be sure to install a drain trap at the drain outlet since
the inside of the unit is at negative pressure relative to
atmospheric pressure during operation.
• Knock out the plastic seal with a screwdriver and a
hammer.
(Refer to Fig. 7)
NOTE
• In case of horizontal installation, carefully knock out the
plastic seal. Operation without opening the drain piping
connection hole causes water leakage.
Reinstall the cover.
Remove the cover
Secondary drain piping
connection hole
English