48
Damper Section Removal and Re-installation
(see Fig. 33)
To remove damper section:
1. Turn off all power to unit.
2. Use
5
/
32
-in. hex (Allen) tool or
3
/
8
-in. nut driver to
remove front (40UV) or bottom (40UH) panels and right
end panels.
3. Remove four carriage bolts and nuts securing kickplate
to end frames.
4. Remove the two
1
/
4
-in. head screws securing kickplate to
the damper sides (one on each side) and remove
kickplate.
5. Remove
1
/
4
-in. head screws attaching outside air (OA)
actuator to damper shaft or attaching locking quadrant
assembly to damper shaft. Remove OA actuator or lock-
ing quadrant assembly.
6. Remove six
1
/
4
-in. head screws (3 per side) securing
damper to 40UH unit rear panel.
7. Remove two
5
/
16
-in. nuts attaching damper assembly to
back frame.
8. Remove damper assembly from unit.
To replace damper section:
1. Replace damper assembly into unit.
2. Replace
5
/
16
-in. nuts attaching damper assembly to back
frame.
3. Replace six
1
/
4
-in. head screws (3 per side) securing
damper to 40UH unit rear panel.
4. Replace
1
/
4
-in. head screws attaching OA actuator to
damper shaft OR attaching locking quadrant assembly to
damper shaft. Replace OA actuator or locking quadrant
assembly.
5. Replace the two
1
/
4
-in. head screws securing kickplate
to the damper sides (one on each side) and remove
kickplate.
6. Replace four carriage bolts and nuts securing kickplate to
end frames.
7. Re-install front (40UV) or bottom (40UH) panels. re-
install end panels.
Ensure that tag on each right front
panel (40UV) or middle bottom panel (40UH)
matches unit tag.
8. Restore power to the unit.
WARNING
Lock out and tag all power supplies to equipment and con-
trols prior to servicing unit. Follow all safety codes. Failure
to do so could result in personal injury.
CAUTION
The assembly order of the bearing installation is critical. Be
careful with all components during removal and installa-
tion. Any excessive force applied to these components can
cause unintended damage and void unit warranty.
IMPORTANT: Tag each right front panel (40UV) or
middle bottom panel (40UH) for each unit. Panels have
electrical information specific to each unit.
IMPORTANT: Tag kickplate for each unit. Kickplate
has electrical information specific to each unit.
