6
Fig. 12 — Connect 12-pin Plugs Together
Fig. 13 — Connect 12-Pin Plug to
Unit Control Board
Fig. 14 — Connect Ground Wire From Controller
NOTE: Some control box configurations may differ.
Fig. 15 — Route SAT and OAT Wires to Indoor
Blower Section
18. Connect the brown wire from the controller harness to the
UCB. Refer to economizer wiring diagram on page 7. The
brown wire connects to “C”, on the UCB.
19. Locate the green wire with yellow stripe from the controller
harness and screw it to the control box (ground). (See
20. Locate the 4 wires labeled (Supply Air Thermostat) SAT and
(Outdoor-air Thermostat) OAT, connected to the controller
harness.
21. Route the 4 wires through the divider between the control box
and the indoor blower section. (See Fig. 15.)
22. Screw the HH79AH001 mixed air (MAT) sensor to the left
side edge of indoor blower through pre-punched holes. (See
Fig. 16.) Connect one of the 2 green wire harnesses into the
HH79AH001 sensor and then connect the green wires to the
orange and brown wires routed from the control. (See
Fig. 17.)
23. The supply air temperature sensor may look like an eyelet
terminal with wires running to it (HH79ZZ007). 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. (See Fig. 16.)
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. 17.)
25. If using differential return sensor or (demand control ventila-
tion) DCV sensor. install this now. See installation details on
page 8, in section Installing Optional HH57AC081 Single
Outside Air Enthalpy Sensor later in the instructions. Refer to
the wiring diagrams on page 10 for further information.
26. Re-install the Indoor blower access panel. (See Fig. 9.)
Control
Box
Controller
Harness
Indoor
Blower
Section
