542933-UIM-C-0112
Johnson Controls Unitary Products 11
Indoor Control Wiring
A communicating furnace or air handler (denoted by a “-C” in the model number) will arrive with a
control outfitted for communication. The communicating indoor controls will have two communicat-
ing terminals. One will be a communicating plug input and the other will be a screw terminal (as
shown below in Figure 10).
1. Disconnect all power from system (including high and low voltage).
2. Screw the 4 wires from the Touch Screen Communicating Control and outdoor control to the
communicating screw terminal (8 wires in all). Be sure that all wires are connected respectively
(A+ = A+, R = R, C = C, B- = B-).
FIGURE 10:
Communicating Indoor Controls
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury, death, or equipment damage.
Before installing, modifying, or servicing system, the main electrical disconnect switch must be in
the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a
suitable warning label.
If the installer finds that the indoor control screw terminals are presenting a challenge, wire nuts
can be used to connect the controls on the outside of the indoor unit.
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