Communicating Indoor Unit - Communicating Outdoor Unit; Communicating Indoor Unit - Single Stage Cooling Unit; Adjusting Real Time Clock; Setting Calendar And Time - Trane ACONT900AC43UA Service Manual

4 Heat/3 Cool/ Heat Pump
Communicating Programmable 3-Wire Hookup
If no equipment is connected during the Auto-Discov-
ery process, the system mode will be stuck at "OFF"
and no equipment will run.
To change the default/discovery settings, enter the in-
staller Setup menu (See Table 4, Pages 9-17) and
select the desired item.
Only ISU settings with an "E" will be Auto-Discovered.
Manually changing an ISU setting to an option other
than "E" disables Discovery mode for that ISU setting.
See Table 3 for default cycle rate settings.
Table 3
Communicating indoor unit - Communicating
outdoor unit
For a fully communicating system, the communicat-
ing Comfort Control will automatically configure the
indoor and outdoor equipment configuration and cycle
rates for each stage (See Figure 2.)
Communicating indoor unit - Single stage
cooling unit
For a partially communicating system, the commu-
nicating Comfort Control will automatically config-
ure the indoor equipment configuration and cycle
rates for each stage (See Figure 3.)
The outdoor equipment configuration will default to
a single stage cooling unit.
(A/T)CONT900AC43UA Installer Guide

Adjusting real time clock

Setting calendar and time

Locate and remove the tab labeled "Remove" in the
lower left corner of the Comfort Control back. The
tab must be removed to activate the real time clock.
(See Figure 5.)
Figure 5
If the system is not powered, the real time clock bat-
tery life is approximately 20 weeks.
The Comfort Control is designed to automatically
keep the current time and day in memory for up to
ten years under normal use once calendar is set.
When the Comfort Control is powered, the display is
ready for the calendar date to be entered (See Fig-
ure 6, next page)
Note: Clock accuracy is +/- 1 minute per month
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