C - A 6
TCONT900AC43UA Installer’s Guide
4 Heat/3 Cool/ Heat Pump
Communicating Programmable 3-Wire Hookup
(A/T)CONT900AC43UA Installer Guide
Step 1
Loosen the terminal screws on the sub-base. Insert
wires into the terminal block next to the loosened
screw (See Figure 4.)
Figure 4
Step 2
Securely tighten each terminal screw.
Step 3
Push excess wire back in the hole.
Step 4
Plug the hole in the wall with nonflammable insulation
to help prevent drafts from adversely affecting Comfort
Control operation.
Mounting Comfort Control on sub-base
Step 1
Align the terminal screw block with the pins on the
back of the Comfort Control.
Step 2
Push the Comfort Control straight onto the wallplate
(See Figure 4.)
Step 3
Perform installation of all other system equipment.
Step 4
Turn ON power to the heating and cooling equip-
ment.
Initial power-up
Power-up sequence
The communicating Comfort Control will communicate
and identify all communicating components in the sys-
tem.
Discovery mode
Discovery mode begins when the communicating Com-
fort Control is first installed and power is connected.
For communicating equipment, the Comfort Control
automatically configures the equipment type, number
of stages, cycle rates for each stage and compressor
stage ratios based on the information it received dur-
ing Discovery mode.
While in Discovery mode, the LED indicator located
in the upper right corner of the Comfort Control will
be illuminated.
All discovered values will be saved into memory. If
a communicating device goes missing (Err 89) or
changes in value (Err 126) the error will be broad-
cast to the Comfort Control screen (restoring com-
munications will clear this error or see ISU 0706 to
reset the system configuration.)
The communicating Comfort Control can be reset
(ISU 0710) to factory default settings.
Note: ISU 0706 Will force a reinitialization without af-
fecting presets. ISU 0710 will reset everything includ-
ing custom programs and presets.
Important: Use 18-gauge color-coded Comfort Control cable for proper
wiring. Shielded cable is not typically required. Keep this wiring at least
one foot away from large inductive loads such as Electronic Air Cleaners,
motors, line starters, lighting ballasts, and large distribution panels. Failure
to follow there wiring practices may introduce electrical interference (noise)
which can cause erratic system operation. All unused Comfort Control wire
to be grounded at indoor unit chassis ground only. Shielded cable may be
required if the above wiring guidelines cannot be met. Ground the shield
only to the system chassis.
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