Fujitsu UTZ-BD035B Technical Manual page 38

 MODEL INSTALLATION (FOR
CEILING-MOUNTED TYPE)
Installation of Unit Body
 You are required to prepare the
ceiling suspension bolts, nuts,
and washers.
 I n s t a l l t h e u n i t f i r m l y a n d
horizontally to support its weight
sufficiently. (Fig. 1)
 If you do not fit it firmly, it is
not only dangerous but also
easily vibrated. If it is not fitted
horizontally, the damper unit
becomes defective in operation.
Caution
 When you are required to be cautious particularly on
prevention of vibration, we recommend you to use the anti-
vibration ceiling suspension fixtures. (Fig. 2)
 Never fail to make an inspection opening with � 450mm or
more at the specified place, so that you can inspect filters, heat
exchange elements, power source, and motors.
Cautions on Installing the Unit Body Upside Down
 Re-fit the ceiling suspension
fixtures in the opposite side. (If they
are left as they are, the foolproof
function of ceiling suspension bolts
does not work and will cause the
danger of dropping the unit.)
 Printed indication is in a reversed
position. In particular, be careful
of the arrow mark "↑" showing
the direction of inserting the heat
exchange element.
Note: The above provisions apply only to those models that allow
reverse installation.
 DUCT INSTALLATION
 Wind the junction of an adaptor and a duct with an aluminum
tape firmly to prevent any air leakage.
 The room intake opening should be positioned as far as
possible away from the inside supply opening.
 Use the specified ducts with the diameters appropriate for the
unit.
 Install two outdoor ducts, so they will be in the down gradient
toward outside to prevent water from coming in. (Gradient:1/100
- 1/50) (Fig. 3)
 Never fail to heat-insulate two indoor ducts (including intake
and exhaust air ducts) to prevent dewing. (Material: Glass
Wool, Thickness: 25mm) (Fig. 3)
 When you want to piece the metal duct through the metal lath
or the wire lath or the metal plate of the wooden facility, do not
forget to insulate electrically between the duct and the wall.
(Please refer to the electric facility engineering standards and
the internal regulations.)
Heat Insulation Material (to
insulate the Adapter and
Aluminum Tape)
Gradient
Aluminum
Tape
Fig. 3
Ceiling Suspen-
Ceiling Suspen-
sion Bolt
sion Bolt
Nut
Nut
Washer
Washer
Ceiling
Ceiling
Suspension
Suspension
Fixture
Fixture
Washer
Washer
Nut
Nut
Fig. 1
Fig. 1
Ceiling Suspen-
Ceiling Suspen-
sion Bolt
sion Bolt
Anti-Vibration
Anti-Vibration
Ceiling
Ceiling
Suspension
Suspension
Fixture
Fixture
Unit Body
Unit Body
Fig. 2
Fig. 2
Unit installed upside down
Hexagon
Bolt
Insulation
Material
One or
Unit Body two bolts
Outside Intake Duct, Exhaust Air Duct
Aluminum Tape
Cautions for duct piping
In an installation layout as in Fig. 4, do not operate the heat
exchange unit A alone.
When the heat exchange unit B stops operation, air is reversed
from SA (intake opening), reducing the fresh external air, and
deteriorating the ventilation efficiency.
In this case, an electric damper should be installed in the duct
piping (please refer to Fig. 5), so that the opening/closing
functions can be mechanically controlled.
Heat Heat
Exchange Exchange
Ventilation Ventilation
Unit A Unit A
Fig. 4 Fig. 4
 The intake and exhaust openings on the external walls should
generally be distanced from each other by about three times
the duct diameter to prevent short circuits.
 Vibration prevention is basically unnecessary. (If anti-vibration
ceiling suspension fixtures are required, please use FY-BG71 -
BG74).
 Install the ceiling-mounted and ceiling-suspension types
horizontally. (Otherwise, damper may not function properly.)
 For the ceiling-mounted type, install an inspection opening at a
specified location to check the heat exchange elements, filters,
and wind blower.

Refrain from using the following duct
installation works.
(1) Excessive bending
(3) Making the connecting duct smaller
- (01-35) -
<When collective ducts are used>
Electric Electric
Electric
Damper Damper
Heat Heat
Damper
Exchange Exchange
Ventilation Ventilation
Heat
Heat Heat
Unit A Unit A
Exchange
Exchange Exchange
Ventilation Ventilation Ventilation
Unit B Unit B Unit B
Fig. 5 Fig. 5
(2) Multi-times bending
Electric
Damper
Heat
Exchange
Ventilation
Unit B