8
19. Connect the 12-pin female plug from the controller harness to
ECON on the UCB. Refer to Fig. 17 and wiring diagram on
page 9.)
Fig. 17 — Connect 12-Pin Plug to
Unit Control Board
20. Connect the brown wire from the controller harness to the
UCB. Refer to economizer wiring diagram on page 9. The
brown wire connects to “C”, on the UCB.
21. Locate the 4 wires labeled (Supply Air Thermostat) SAT and
(Outdoor Air Thermostat) OAT, connected to the controller
harness.
22. Route the 4 wires through the divider between the control box
and the indoor blower section. (See Fig. 18.)
23. The supply air temperature sensor may look like an eyelet ter-
minal with wires running to it (HH79NZ039). The sensor is
located on the “crimp end” and is sealed from moisture.
Mount the supply air temperature sensor (provided) to the fan
deck, near the right hand side corner post. Connect the sensor
red and black wires to the orange and brown wires from the
controller. (See Fig.18.)
24. Connect the pink and violet wires routed from the controller
harness to the pink and violet terminals in the wire bundle in
the indoor blower section. (See Fig. 19.)
25. If using differential return sensor or (demand controlled ven-
tilation) DCV sensor, install this now. Refer to Table 7 for
Sensor Usage and Table 6 for Enthalpy Manual Entry Set-
points details. Refer to page 18 for Damper settings. See
installation details on page 18.
26. Re-install the Indoor blower access panel. (See Fig. 13.)
27. After powering unit controller, program the POL 224 control-
ler. After all settings have been made, re-install the unit con-
trol box panel. (See Fig. 13.)
28. Install the filter by opening the filter clips which are located
underneath the hood top. Insert the aluminum filter into the
bottom filter rack (hood divider). Push the filter into position
past the open filter clips. Close the filter clips to lock the filter
into place. (See Fig. 20.)
Economizer performance charts are shown in Fig. 21 and 22
on page 10. See base unit installation manual to make adjust-
ments to meet building ventilation requirements.
Fig. 18 — Supply Air Sensor Installation POL 224 (Vane Axial Fan System)
To Control Box
ORG
BRN
SAT Ring Terminal Ref
PL6 Ref
Bundle these
connections
into the corner
post with wire tie.
PNK
VIO
VIO
PNK
RED
BLK
PL6
Control
Box
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