Special Functions - Honeywell VisionPRO TH8000 Series Installation Manual

Installer system test
System test
1 Cooling system
2 Fan system
3 Heating system
4 Emergency
heating system
5 Humidifier
6 Dehumidifier
7 Ventilator

Special functions

Auto Changeover (Setup Function 0300): When set to Auto, the thermostat automatically selects heating
or cooling depending on the indoor temperature. Heat and cool settings must be at least 2 degrees apart. If
function 0380 is set to On, the heat and cool settings must be at least 5 degrees apart.
Remote Sensor (Setup Function 0340): If an optional outdoor sensor is installed, the thermostat can display
the outside temperature. If an optional remote indoor sensor is installed, the thermostat will display the tem-
perature at the sensor location (the internal sensor in the thermostat is not used). A Discharge Air Tempera-
ture Sensor (DATS) is required to enable desert humidification.
Adaptive Intelligent Recovery (Setup Function 0530): Allows the thermostat to "learn" how long the furnace
and air conditioner take to reach programmed temperature settings, so the temperature is reached at the
scheduled time.
Compressor Protection (Setup Function 0580): Forces the compressor to wait a few minutes before restart-
ing, to prevent damage. During this time, the message "Wait" is displayed.
Dehumidification control (Setup Function 0380): TH8321 models monitor the indoor humidity level and
automatically activate the cooling system to reduce humidity by lowering the temperature by up to 3 degrees
below the current cool setting. When Setup Function 0371 is set to dehumidification, the U1/U1 relay can be
set to control dehumidification.
Heat Pump Control — Electric Backup (Setup Functions 0350-0360): If an outdoor temperature
sensor is installed, select a compressor lockout temperature (Function 0350). Below this temperature,
only electric heat operates. Also select an auxiliary lockout temperature (Function 0360). Above this
temperature, only the compressor operates. Between these temperatures, both heat sources operate.
Heat Pump Control — Fossil Fuel Backup (Setup Function 0345):
Option 0 (No Droop Control): If outdoor temperature is above balance point (Function 0350), only the
compressor operates. Below this temperature, only backup heat operates.
Option 1 (Droop Control): As above, but backup heat is activated if room temperature drops to the
selected droop temperature setting (compressor is deactivated).
Option 2: (Droop Control with Aux Heat lockout): Compressor works only above auxiliary lockout
temperature, backup heat works only below balance point, 2° droop between temperatures.
If temperature is not reached in a reasonable time, set the upstage timer (Function 0346). After the
designated time, the compressor will be deactivated and the system will switch to backup heat.
Ventilation Control (Setup Functions 0400-0432): If the system includes a self-powered ventilation unit
(Function 0400), the home can be ventilated on demand. Ventilation can also be locked out based on high
and low outdoor temperature (Function 0431 & 0432)—outdoor temperature sensor required.
Dehumidification Away Mode (Setup Functions 0390-0394): This feature is useful for homes in southern
climates. It allows humidity control when the the home is unoccupied for long periods during the hot/humid
season. You can control temperature (Function 0393) and dehumidification (Function 0394) while away. You
can control humidity with a dehumidifier or a cooling system (Function 0379). If a cooling system is used,
humidity is controlled by cooling indoor air to the Low Limit Temperature (Function 0392). When the desired
humidity is reached, the system will maintain the temperature you select in Function 0393.
Indoor Air Quality Device (Setup Function 0371): This feature allows the thermostat to control one of the fol-
lowing IAQ devices: whole house humidifier, dehumidifier, or ventilator.
System status
0 Compressor and fan turn off
1 Compressor and fan turn on
2 Second stage compressor turns on
0 Fan turns off
1 Fan turns on
0 Heat and fan turn off
1 Heat turns on (fan on if Function 0170 is set for heat pump,
or if Function 0180 is set to "1")
2 Second stage heat turns on
3 Third stage heat turns on
0 Heat and fan turn off
1 Heat and fan turn on
0 Off
1 Humidifier on
0 Off
1 Dehumidifier on
0 Off
1 Ventilator on
11
VisionPRO TH8000 Series
TM
** See page 6
CAUTION: EQUIPMENT
DAMAGE HAZARD.
Compressor protection
is bypassed during test-
ing. To prevent equipment
damage, avoid cycling the
compressor quickly.
69-2389—03