INSTALLER’S GUIDE
Pub No. 18-HD32D1-2
TCONT900AC43UA
COMFORT CONTROL -
4 HEAT (GAS, OIL*, OR ELECTRIC)/3 COOL/HEAT PUMP
COMMUNICATING PROGRAMMABLE
3 WIRE HOOKUP
ALL phases of this installation must comply with NATIONAL, STATE, AND LOCAL CODES
NOTE: If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the
trash. Dispose of properly.
NOTE: Contact your local waste management authority for instructions regarding recycling and the proper disposal of
an old control.
INTRODUCTION
The TCONT900AC43UA is a communicating programmable Comfort Control that supports single-stage or multi-stage
heat/cool and heat pump applications. It is a wall mounted, low voltage (24VAC) communicating Comfort Control with
backlit LCD and a touch screen display. Room temperature is maintained by controlling the operation of heating,
cooling, heat pump, and dual fuel systems via digital, 2-way communications. The Comfort Control will communicate
with and identify all ComfortLink
TM
II components in the system. It is easily manually configured via the user friendly
Installer Setup menu. The Comfort Control features include separate heating and cooling setpoints, selectable auto or
manual changeover, menu driven 7-day programming, adjustable filter reminders, and outdoor temperature sensing.
Setup selections and diagnostics are stored indefinitely in the Comfort Control’s nonvolatile memory eliminating the
need for battery backup.
* See System and Fan Keys section for specific information.
Accessories
Optional
BAYSEN01ATEMPA - Outdoor Sensor - For use with communicating outdoor equipment
BAYTAM00AC00UA - Telephone Access Module (TAM)
Table 1. TCONT900AC43UA Comfort Control
Power Method Changeover
System Selection
and Fan Keys* Fan Selection Comments
24 Vac common wire Automatic or Manual
selectable
Heat-Off-Cool-Auto
Emergency Heat
On-Auto-Circ System and Fan
selection vary, based on
system type
Humidity sensor to
control dehumidification
and humidification
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