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M 871-3
ExtendAire & Optional Boost Fan
Installation Procedure Models PDAF
and PDHF
Note: For Flat Top ExtendAire installation, the wall sleeve
must extend a minimum of 2.5" into the space, through
the finished wall, to allow proper Primary Discharge
Section installation.
1. Remove front panel by lifting straight up until the panel
flanges clear the flanges on the wall sleeve (
).
Note: Set front panel aside for reinstallation
Figure 6: Lift front panel up until it clears the flanges on
the wall sleeve
Lift Front Panel straight up until it
clears the flanges on the cabinet wrap
2. Remove the touchpad control bezel by releasing the plastic
clips located on the underside of the touchpad control
opening. Unplug the touchpad communication cable from
the control box (
). Set aside for reinstallation.
Figure 7: Remove the touchpad control bezel and unplug
the communication cable
Release the tabs on the
touchpad bezel from the
underside of the touchpad-
control opening
Unplug the touchpad com-
munication cable from the
control board
3. Remove the two (2) screws located at each end of the
cabinet wrap securing it to the wall sleeve. Lift slightly,
and pull the cabinet wrap away from the unit chassis/wall
sleeve (
Figure 8: Remove two (2) screws securing the cabinet wrap
to the wall sleeve, lift slightly, and pull away cabinet wrap
Remove two (2) screws securing
the cabinet wrap
4. Bend the hold down tabs on the underside of the cabinet
wrap grille tray/control door assembly 90º, and remove
grille tray (
).
Figure 9: Bend Tabs on the underside of the cabinet
Bend Grille Tray Tabs 90º
NOTICE
If the optional boost fan is to be installed, install it now, referring to
If the optional boost fan will not be installed continue the
ExtendAire installation as follows.
5. Reinstall the cabinet wrap to the wall sleeve.
Note: Before installing the mounting brackets for the
ExtendAire primary discharge section be sure they are
assembled as shown in
detail.
