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12 Unit installation
a
b
c
b
d
e1
a
Nut (field supply)
b
Washer (accessories)
c
Hanger bracket
d
Double nut (field supply)
e1
Suspension bolt pitch
Class 50~125: 630 mm
e2
Suspension bolt pitch
Class 50~80: 1038 mm
Class 100~125: 1438 mm
▪ Level. Make sure the unit is level at all four corners using a level
or a water-filled vinyl tube.
b
a
a
Water level
b
Vinyl tube
NOTICE
Do NOT install the unit tilted. Possible consequence: If
the unit is tilted against the direction of the condensate flow
(the drain piping side is raised), the float switch might
malfunction and cause water to drip.
INFORMATION
Optional equipment. When installing optional equipment,
also read the installation manual of the optional equipment.
Depending on the field conditions, it might be easier to
install the optional equipment first.
Installation box for the optional output PCB
An additional Installation box for the optional output PCB is required;
see the option list of the indoor unit. For installation of the installation
box, refer to the manual of the installation box. The wiring between
the main PCB and the optional output PCB must be led together with
the transmission cable; never use the same route as for the power
supply cable. See
"14.2 To connect the electrical wiring to the indoor
unit" [ 4 20].
4×
Installation and operation manual
16
(mm)
12.2.2
Guidelines when installing the ducting
WARNING
Do NOT install operating ignition sources (example: open
flames, an operating gas appliance or an operating electric
heater) in the duct work.
CAUTION
▪ Make sure the installation of the duct does NOT exceed
the setting range of the external static pressure for the
unit. Refer to the technical datasheet of your model for
the setting range.
▪ Make sure to install the canvas duct so vibrations are
NOT transmitted to the duct or ceiling. Use a sound-
absorbing material (insulation material) for the lining of
the duct and apply vibration insulation rubber to the
hanging bolts.
▪ When welding, make sure NOT to spatter onto the
drain pan or the air filter.
▪ If the metal duct passes through a metal lath, wire lath
or metal plate of the wooden structure, separate the
duct and wall electrically.
▪ Install the outlet grille in a position where the airflow will
not come into direct contact with people.
▪ Do NOT use booster fans in the duct. Use the function
to adjust the fan rate setting automatically (see
"16 Configuration" [ 4 21]).
The ducting is to be field supplied.
1 Connect the canvas duct to the inside of the flange on both inlet
and outlet side. For connecting the canvas duct, use field
supply screws.
2 Connect the duct to the canvas duct.
a
c
e
f
g
a
Screws for inlet duct flanges (field supply)
b
Screws for outlet duct flanges (accessory)
c
Flange (located on the unit)
d
Indoor unit
e
Insulation (field supply)
f
Canvas duct (field supply)
g
Aluminium tape (field supply)
▪ Fixing screws. When installing an air inlet duct, select fixing
screws that stick out 5 mm on the inside of the flange to protect
the air filter from damage during maintenance of the filter.
a
b
c
5 mm
a
Air inlet duct
b
Inside of the flange
c
Fixing screw
3 Wind aluminium tape around the flange and duct connection.
Make sure there are no air leaks at any other connection.
4 Insulate the duct to prevent condensation from forming. Use
glass wool or polyethylene foam 25 mm thick.
d
c
b
g
f
e
FXMA-A
VRV system air conditioner
3P680922-1A – 2022.01
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