7
Horizontal Installation
These economizers are designed to work in both vertical and
horizontal applications. These instructions are for a horizontal in
-
stallation.
The unit has a horizontal duct opening next to the horizontal
supply duct opening. However, in this application, with an
economizer, the horizontal duct will actually come into the unit
underneath the outdoor air hood. (See Fig. 13.)
Fig. 13 — Install Bottom Panel with Horizontal Return
Duct Opening
1. Turn off unit power supply and install lockout tag.
2. Prepare the unit for economizer installation:
For units with 2 position damper installed, remove the outside
air hood. Unplug the damper actuator and remove assembly
from unit.
For units with manual damper installed, remove the manual
damper and hood.
3. Remove the upper panel and bottom panel (provided with the
HVAC unit) on the end of the unit to expose the return
section. (See Fig. 1.) Save the screws for later, when replacing
the panel. The panels shipped with the unit can be discarded.
4. Remove the unit’s left side corner post and left side panel to
allow for easy economizer installation. (See Fig. 14.)
NOTE: The unit’s left side panel has a duct opening in it, but this
panel/duct opening will not be used in this application and can be
discarded.
Fig. 14 — Remove Unit Corner Post and Side Panel
5. Install economizer with shroud attached, as shown in Fig. 3,
into the return air section of the unit. Be careful not to pinch
the wires during installation. Bottom of economizer will rest
on the base of the unit. (See Fig. 3.)
NOTE: The outside air damper is rated to meet the ASHRAE
requirements for leakage. It is important that the damper be
installed perfectly square in the unit.
6. Reinstall the left side corner post on to the unit. Note the
corner post will sit behind the economizer shroud flange. (See
Fig. 5.) Screw through the corner post and through the
economizer shroud. (See Fig. 5 and 6.)
7. Insert provided screw through the bottom left rear of the
economizer and into the unit base. (See Fig. 3.) Install the
new (provided) left side panel without the duct opening on
the unit.
8. Before the economizer is secured in place on the right hand
side, remove and save the 12-pin jumper plug from the unit
wiring harness. (See Fig. 6.) Insert the EconoMi$er
®
2 plug
into the unit wiring harness plug. (See Fig. 6.)
NOTE: The 12-pin jumper plug should be saved for future use
in the event that the EconoMi$er2 is removed from the unit.
The jumper plug is not needed as long as the EconoMi$er 2 is
installed.
9. Install the (provided) bottom panel with the horizontal return
duct opening on the unit. (See Fig. 13.) Screw panel in place.
10. Install the upper end economizer panel in place over the econ
-
omizer’s outside air damper, and above the bottom panel.
(See Fig. 12.) Screw panel in place and screw panel into
economizer in 2 places. (See Fig. 8.)
11. Assemble the outside air hood per Fig. 9-11.
a. Install filter supports (Item #1) to the upper end panel
using the screws provided.
b. Install each deflector (Item #8) on to each filter support
(Item #1) using the screws provided.
c. Apply seal strip to mating flanges on the side plates of
the hood (Item # 4 and #5).
d. Secure the side panels (Item #4 and #5) to the upper
panel using the screws provided.
e. Apply the seal strip to the mating flange of the hood.
(See Fig. 9).
f. Secure hood top (Item #3) to the upper panel using the
screws provided. On the 44 in. chassis remove the
screws from across the top cover of the unit. The rear
flange of the hood top will slide behind the unit top over
the flange.
g. Secure side retainers (Item #6) to side panels (Item #4
and #5) using the screws provided, screwing from the
outside of the hood.
h. Secure each central retainer (Item #2) to the hood top
(Item #3). Align the central retainers to the holes located
on the filter support (Item #1), so the central retainer is
perpendicular to the hood and each filter support. Secure
using the screws provided.
i. Apply seal strip to top diverters (Item #7).
j. Secure top diverters (Item #7) to the hood top (Item #3).
k. Install outdoor air screens by sliding them into each of
the four spaces created by the hood, filter support and,
central retainers. First insert the air screens into the
pocket created at the end of the hood (Item #3), then
fully put the air screen into place. Slide the air screens
back into the pocket created in the filter support
(Item#1). Repeat this step for each air screen. (See
Fig. 10.) See Fig.11 for complete hood assembly.
Bottom Panel With
Return Duct Opening
Unit’s Left Side
Panel With
Duct Opening
Left Front
Corner Post
