5
Fig. 7 — Install Screws to Locate Power Exhaust Fan
Assembly for Vertical Return Air Applications
Fig. 8 — Install Power Exhaust Fan Assembly on
Vertical Return Air Applications
NOTE: Figures 8 and 9 are shown with the economizer hood re
-
moved to provide a clear view of the flange at the top of the power
exhaust fan assembly (Fig. 8) and the tops of the block off panels
(Fig. 9).
5. Install three 1/4-14 x 3/4 in. gasket head screws
(AL31AZ308) in the three locations at the top flange of the
power exhaust fan assembly. (See Fig. 8.)
6. Tighten the three screws at the bottom of the power exhaust
fan assembly, installed in Step 3 above. (See Fig. 8.)
7. Install the left block-off panel with two No. 10 x 5/8 in. ser
-
rated head screws (AL48M217) at the bottom edge. Make
sure the top edge of left block-off panel is behind the flange
of the upper economizer panel. Install three 1/4-14 x 3/4 in.
gasket head screws (AL31AZ308) to secure the left block-off
panel to the flange on the power exhaust fan assembly. Install
four No.10 x 7/8 in. gasket head screws (AL31AZ219) to
secure the left block-off plate to the unit corner post and the
upper economizer panel. (See Fig. 9.)
8. Remove two small plug access plates located in the
economizer motor compartment. The economizer motor
compartment is accessible by removing the control box side
economizer hood screen, if the economizer hood is already
installed on the unit.
9. Route the PL-9 plug, supplied with the power exhaust fan
assembly, through the bottom plug access hole in the econo
-
mizer motor compartment and through the top plug access
hole. Route the PL-9 through the grommet located in the top
left corner of the control box.
10. Connect the 6 pin plug PL-9 from the wiring harness into the
6 pin plug of the power exhaust fan assembly. Make sure that
the PL-9 connection is made inside the control box.
Fig. 9 — Power Exhaust Block-Off Panels Installed
for Vertical Return Air Applications
11. Bundle up excess wire of the motor harness and secure
with wire ties. When bundling wires, be sure to gather
wires as close as possible so that the wires cannot contact
moving parts for the power exhaust fans or the economizer
mechanisms.
12. Replace plug access plates in economizer motor compart
-
ment.
13. Install the right block-off panel with two No. 10 x 5/8 in.
serrated head screws (AL48AM217) at the bottom edge.
Make sure the top edge of the right block-off panel is behind
the flange of the upper economizer panel. Install three
1/4 -14 x 3/4 in. gasket head screws (AL31AZ308) to secure
the right block-off panel to the flange of the power exhaust
fan assembly. Install four No. 10 x 7/8 in. gasket head screws
(AL31AZ219) to secure the right block-off panel to the unit
corner post and upper economizer panel. (See Fig. 9.)
14. Install six 1/4-14 x 3/4 in. gasket head screws (AL31AZ308)
in three holes in the left and right side block-off panels to pre
-
vent water leakage into the unit. These holes are for mounting
the power exhaust in the shipping position but are not needed
for accessory power exhaust applications. (See Fig. 9.)
15. Apply silicone caulking to corners and flanges of power
exhaust fan assembly at the block-off panels to prevent water
leakage.
16. Replace control box access panel.
Install three No. 10 x 5/8 in.
serrated head screws
at the indicated locations.
Install three 1/4-14 x 3/4 in.
gasket head screws at the
indicated locaitons.
Left
Block-Off
Panel
Right
Block-Off
Panel
