6
Fig. 13 — Hood Assembly — Completed
Fig. 14 —
Hood Assembly Installed
Horizontal Installation
These economizers are designed to work in both vertical and
horizontal applications. These instructions are for horizontal
applications.
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. 15.)
Fig. 15 —
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:
a. For units with 2 position damper installed, remove the
outside air hood. Unplug the damper actuator and
remove assembly from unit.
b. For unit 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. 16.)
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. 16 —
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. The bottom of economizer will
rest on the base of the unit. (See Fig. 4.)
6. Reinstall the left side corner post on the unit. Note the corner
post will sit behind the economizer shroud flange. Screw
through the corner post and through the economizer shroud.
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. Insert the EconoMi$er X plug into the unit
wiring harness plug. (See Fig.7.)
NOTE: The 12-pin jumper plug should be saved for future
use in the event that the EconoMi$er X is removed from the
unit. The jumper plug is not needed as long as the
EconoMi$er X is installed.
9. Install the bottom panel (provided) with the horizontal return
duct opening on the unit (see Fig. 15 and 17). Screw the panel
into place.
10. Install the upper end economizer panel in place over the econ
-
omizer’s outside air damper, and above the bottom panel.
Screw panel in place and screw panel into the economizer in
2 places.
11. Locate the mixed (supply) air temperature sensor
(HH79AH001) in the economizer hardware bag. A 2-wire
sensor harness with spade terminals is supplied with the sen
-
sor. Plug the harness into the top of the HH79AH001 sensor.
Mount the sensor in the indoor fan section of the unit. Locate
the orange and brown wires in the wire bundle in the indoor
fan section. Connect these orange and brown wires to the
2-wire harness attached to the HH79AH001 sensor. Mixed air
default setting is 53°F and can be adjusted from 38°F to 70°F.
Assemble the outside air hood per Fig. 12 and 13.
a. Install four hood angles to the upper end panel using the
screws provided.
b. Apply seal strip to mating flanges on the side plates of
the hood and the hood top.
Outdoor
Air Hood
Relief Damper
Bottom Panel With
Return Duct Opening
Unit’s Left Side
Panel With
Duct Opening
Left Front
Corner Post
