12
HORIZONTAL INSTALLATION
These economizers are designed to work in both a vertical and
horizontal applications. These instructions are for a horizontal.
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. 21 and 22.)
1. Turn off unit power supply and install lockout tag.
2. Prepare the unit for economizer installation:
a. For units with 2 position damper installed, remove the
outside air hood. Unplug the damper actuator and
remove assembly from unit.
b. 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. 2.) Save the screws for use later when
replacing the panel. The panels can be discarded.
4. Remove the unit’s left side corner post and left side panel
from the unit to allow for easy economizer installation. (See
Fig. 21.)
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.
5. Install economizer, 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. 4.)
6. Reinstall the left side corner post on to the unit. NOTE: The
corner post will sit behind the economizer flange. (See
Fig. 5.) Screw through the corner post and economizer. (See
7. Insert provided screw through the bottom left rear of the
economizer and into the unit base. (See Fig. 4.) 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. 7 and 12.) Insert the EconoMi$er2
plug. (See Fig. 7.)
NOTE: The 12-pin jumper plug should be saved for future use in
the event that the EconoMi$er2 component is removed from the
unit. The jumper plug is not needed as long as the EconoMi$er2
component is installed.
9. Install the (provided) bottom panel with the horizontal return
duct opening on the unit. (See Fig. 22.) Screw panel in place.
10. Install the upper end economizer panel in place over the
economizer’s outside air damper, and above the bottom
panel. Screw panel in place and screw panel into economizer
in 2 places. (See Fig. 23.)
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. 10).
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. 11.) See Fig. 12 for complete hood assembly.
12. Install the hood assembly into the unit. (See Fig. 3, 9, 10, 11.)
13. If barometric relief is required, remove the relief damper and
hinges from the (provided) bottom panel used on vertical
applications. Reinstall the hinges and damper on the side of
the field supplied return duct. (See Fig. 23.)
NOTE: A relief hood for the horizontal application can be ordered
separately (part number CRBARHOD001A00) or can be
field-supplied.
14. Install the hood screens and other approved EconoMi$er2
accessories.
NOTE: When setting high temperature economizer limit in
California, see Table 2 for acceptable regional requirements.
