4
INSTALLER’S GUIDE
18-HE39D8-13A-EN
4. Install Rain Hood Assembly
1. Locate the rainhood assembly, which includes the relief
damper and the mist eliminator. The back of the hood side
mating flanges need to be gasketed (gaskets included in
kit). Loosen the right two (2) screws on the unit’s top sealing
flange above the economizer. See Figure 3 on page 3.
2. Slide the top flange of the hood up underneath the unit’s top
sealing flange. Drive two self tapping screws into the keyhole
openings on the side flanges of the hood. Tighten the two (2)
screws on the top sealing flange and the screws on the hood
side flanges. See Figures 8 and 9.
5. Mount Mixed Air Sensor
1. Mount the Mixed Air sensor (with wiring) to the left Blower
partition using two sheetmetal screws. See Figure 10. The
male tabs on the two (2) yellow wires will connect to the
Economizer wiring harness in a later step.
2.
Enthalpy and/or CO2 Sensor
-
If used, install these
options at this time per instructions provided.
Figure 4. Insert Economizer in Shipping Position
DC, TC, YC, or WC
Unit
Dry bulb outside air
temperature sensor
Insert economizer
in folded shipping
position
Economizer
actuator and
controller
6. Route Main Wiring
1. From the Economizer assembly, pass the wire harness
through the coil grommet. See Figure 10 (view A) on page
8. Continue routing the harness behind the Compressor
compartment and into the Blower compartment.
2. Continue routing the remaining harness through the grom-
met in the Control Box partition and into the Control Box.
7. Complete Installation
1. In the Control Box, complete the wiring connections per the
appropriate wiring diagram on pages 9 and 10. Secure all
wires so that there is no interference with any moving parts
in the unit.
2. Power the economizer and run the checkout procedure on
page 13. Make desired adjustments to the controller setting
the minimum occupied damper position, the outside air
setting (if enthalpy used), and the IAQ sensor (if used).
3. Replace the unit Coil access panel, the Blower access
panel, and the Control/Heat access panel.
