10
Fig. 22 — Front Left View
Fig. 23 — Unit Wiring Harness
9. Remove the indoor-fan motor access panel. (See Fig.17.)
10. Install the supply air temperature sensor (SAT). The sensor
looks like an eyelet terminal with 2 attached wires, and is
shipped in the economizer hardware bag. The sensor is
located on the “crimped” end and is sealed for moisture.
Mount the SAT to the indoor blower housing. (See Fig. 24.)
Use the provided screw to secure in place. Attach the PINK
and VIOLET wires in the unit to the sensor.
11. Replace the indoor-fan motor access panel.
12. Install the (provided) bottom panel with the horizontal return
duct opening on the unit.(See Fig. 25.) Screw panel in place.
13. 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 two places.
14. Assemble the outside air hood per Fig. 26-28 (see Fig. 26 for
hood component locations):
a. Install filters 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 side plates of hood
(Items #4 and #5).
d. Secure side panels (Items #4 and #5) to upper panel
using the screws provided.
e. Apply seal strip to mating flange of the hood (see
Fig. 26).
f. Secure hood top (Item #3) to upper panel using the
screws provided. (On 44 in. chassis, remove the screws
from across top cover of unit. The rear flange of hood
top will slide behind unit top over flange.)
g. Secure side retainers (Item #6) to side panels (Items #4
and #5) using the screws provided, screwing from
outside of the hood.
h. Secure each central retainer (Item #2) to the hood top
(Item #3). Then align central retainers to holes located
on filter support (Item #1), so central retainer is
perpendicular to hood and each filter support. Secure
using screws provided.
i. Apply seal strip to top diverters (Item #7).
j. Secure top diverters (Item #7) to 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. To do so, first insert the air screens into
pocket created at the end of hood (Item #3), then fully
put the air screen into place, and then slide them back
into pocket created in the filter support (Item #1). Repeat
this for each air screen. (See Fig. 27.) See Fig. 28 and 29
for completed hood assembly.
15. Install the hood assembly on to the unit (see Fig. 28 and 16.)
16. Through the outdoor air hood, review and adjust the
EconoMi$er IV controller settings. See “Operation” section
of this manual for details.
a. The standard EconoMi$er IV controller has a factory
setting of 63°F for the outdoor air temperature change-
over and 55°F (fixed) for the supply air temperature
sensor. The outdoor air temperature changeover setting
is adjusted on sensor. (See Fig. 39.) The ABCD
potentiometer on the controller should be set to the “D”
position.
b. The low temperature compressor lockout switch is fixed
at 42°F.
c. The minimum position for the outdoor air damper can be
configured for specific job requirements at the controller.
When not using a CO
2
sensor, the DCV Max
potentiometer must be fully closed (CCW) for the
Minimum Position potentiometer to function correctly.
d. Settings for the optional, outdoor enthalpy sensor, indoor
enthalpy sensor, power exhaust, and CO
2
sensor can be
configured at the controller.
17. 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. 16.)
NOTE: A relief hood for the horizontal application can be ordered
separately or can be field supplied.
18. Install the hood screens and other approved EconoMi$er IV
accessories.
Economizer Outside
Air Damper
Insert
Screw
Left Front
Corner
Post
Insert
Screw
Harness/Plug
Jumper Plug
(Remove)
Harness/Plug
From Economizer
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