Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual page 219

7 Return air duct: Use square duct.
8 Return air port with canvas duct
1) Connection of intake and exhaust ducts.
2) Duct connecting position.
< Fresh air intake >
a) Use side air intake port.
b) In case of simultaneous intake and exhaust, the side air intake port cannot be used, therefore, take air from the
midway air intake port along the intake duct.
< Exhaust >
c) Use a side exhaust port.
3) Duct connection
Use intake and exhaust duct flange of separately sold (for connection of 125mm round duct) to connect 125mm
round duct. The duct clamped by bands must be thermally insulated to prevent dew condensation.
(iv) Drain piping
1) Drain piping should always be in a downhill grade (1/50-1/100) and avoid riding across an elevation or makeing traps.
● Good piping
Suspension
bolts
1.5 m ~ 2m
Heat
A downhill grade
insulation
of 1/100 or more
2) When connecting the drain pipe to the unit, pay suffcient attention not to apply excess force to the piping on the unit side.
Also, fix the piping at a point as close as possible to the unit.
3) For drain pipe, use hard PVC general purpose pipe VP-20
which can be purchased locally. When connecting, insert
a PVC pipe end securely into the drain socket before tight-
ening securely using the attached drain hose and clamp.
Adhesive must not be used connection of the drain socket
and drain hose (accessory).
Fig.1
Make sure to use suction as well.
Pipe cover (small)[insulation]
Looking from top of unit
Side fresh air intake port
Fig.2
● Improper piping
Air vent
Pipe cover (large)[insulation]
Indoor
unit
Clamp
Drain socket
(accessory)
(accessory)
215
- -
Exhaust port
Intake duct
(square duct)
Fresh air intake
port midway
of return duct
Avoid riding across an elevation
Keep free from traps
Do not pipe under water
Level difference part
Drain socket
oint for VP-20
(local procurement)
(accessory)
Drain hose
(accessory)
Pipe cover [insulation]
Adhesion
(local procurement)
Drain hose
VP-20
(local procurement)