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Selection
Installer Test Heat
Installer Test
Emergency Heat
Installer Test
Humidifier
Installer Test
Dehumidification
Function
ADVANCED FEATURES
Adjustable Continuous Air Flow
The Continuous Fan air flow is user adjustable from 25%
to 100% in 5% increments either by entering the User
Setup menu or the Installer Setup menu (see Table 4, ISU
Number 0186).
NOTE: CONTINUOUS fan mode during COOLING
operation may not be appropriate in humid cli-
mates. If the indoor air exceeds 60% relative
humidity or simply feels uncomfortably humid, it
is recommended that the fan only be used in the
AUTO mode.
Control Response Rate
A set of more/ less aggressive Proportional-Integral
control constants can be chosen to increase/decrease the
responsiveness of the temperature control performance.
Choosing a more aggressive rate may cause
overshooting. Furthermore, selecting a less aggressive
rate may result in undershooting.
Cycle Rate
Cycle rate is the selected number of system cycles per
hour at 50% load. If the cycle rate were set to 3, each ON/
OFF cycle would be 20 minutes long when operating at
50% load. The total ON and/or OFF times depends on the
actual indoor space load. A shorter cycle rate may be
desired for Heating mode to maintain tighter control to
indoor setpoint. A longer cycle rate may be desired for
Cooling mode to allow the system to remove moisture
from the air and improve indoor comfort.
Table 6. Installer System Tests
Installer Setup
Factory
Number
Setting
Test 3
0
Test 4
0
Test 5
0
Test 6
0
Choices
Option
Description
0, 1, 2, 3,
0 - Heat is off
4
1 - Heat stage 1
2 - Heat stage 1, 2
3 - Heat stage 1, 2, 3
4 - Heat stage 1, 2, 3, 4
0, 1, 2, 3
0 - EmHeat is off
1 - EmHeat stage 1
2 - EmHeat stage 1, 2
3 - EmHeat stage 1, 2, 3
0, 1
0 - Humidifier off
1 - Humidifier on
0, 1
0 - Dehumidifier off
1 - Dehumidifier on
Auto Changeover
When the system mode is set to Auto, the control
automatically switches between heating and cooling
modes to maintain the desired comfort level.
Setpoint Deadband
The number of degrees separating Heating and Cooling
setpoints is user adjustable from 2 to 9 degrees. When
the control is set to Auto, and the cooling setpoint is
changed to a cooler setpoint, the heating setpoint will also
change to maintain the selected deadband. The same
action occurs when the Heating setpoint is changed to a
warmer temperature.
NOTE: The deadband is restricted to a range of 5 to 9 if
ISU 0380 is set to Integrated Temperature and
Humidity Control (ITHC).
Backlit Display
When continuous backlight is disabled, the liquid crystal
display will illuminate only when a touchscreen key is
pressed to improve visibility. The backlight stays on for 45
seconds after the last touch screen key press. When
continuous backlight is enabled, the liquid crystal display
will remain illuminated continuously. The display will dim
to half brightness 45 seconds after the last touch screen
key press.
Filter Reminders
The Comfort Control can track up to two filter timers by
total fan run time or calendar days. When the preset
timer(s) has expired to remind the homeowner that it is
time to change the filter(s), "Change" then "Filter" will
automatically flash. To reset either filter timer, simply
press the More key to access the filter timer value and
then press the Reset key. Once the timer has been reset,
17
TCONT900AC43UA
Comments
Not shown if ISU 0176 is
set to 0.
If Discharge Air
Temperature Sensor is
available, Press the More
key to show the
Discharge Air
Temperature Air Value.
If Discharge Air
Temperature Sensor is
available, Press the More
key to show the
Discharge Air
Temperature value.
Available only if heat
pump with auxiliary heat
is selected.
Not shown if ISU 0372 is
set to 0.
Fan will follow Hum
setting.
Not shown if ISU 0380 is
set to 0.
Fan will follow DeHum
setting.
Pub. No. 18-HD32D1-2
69-2079—05
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