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TCONT802AS32DA TOUCH SCREEN AND TCONT803AS32DA TOUCH SCREEN WITH DEHUMIDIFICATION
Pub. No. 18-HD25D19-3
69-1790—3 18
ADVANCED FEATURES
Outdoor or Indoor Temperature Sensor
For accuracy, the initial reading of the indoor and outdoor
temperature sensors require five minutes to stabilize. See
the Sensor instructions for installation information.
Special Heat Pump Features
Heat Pump with Fossil Fuel Auxiliary Heat (Dual
Fuel) and Outdoor Temperature Sensor
In this operation there is no external fossil fuel kit (dual
fuel kit) installed; the comfort control controls this function.
1. Choose correct heat pump application in Installer
Setup Number 0170.
2. Choose Fossil Fuel Option as the backup heat
source in Installer Setup Number 0200.
3. Choose No External Fossil Fuel Kit Option as
controlling backup heat in installer Setup Number
0210.
4. Outdoor Temperature Sensor for Control Option
is automatically chosen in Installer Setup Number
0340.
5. Choose appropriate Balance Point Temperature
in Installer Setup Number 0350.
OPERATION IN HEAT MODE ABOVE BALANCE POINT
(OUTDOOR TEMPERATURE)
When the outdoor temperature is above the selected
Balance Point Temperature (ISU 0350), only the
compressor operates and the fan (G terminal) energizes
when the comfort control calls for heat.
OPERATION IN HEAT MODE BELOW BALANCE POINT
(OUTDOOR TEMPERATURE)
When the outdoor temperature is below the selected
Balance Point Temperature (ISU 0350), only the Fossil
Fuel (auxiliary heat) operates and the fan (G terminal)
does not energize when the comfort control calls for heat.
OPERATION IN EMERGENCY HEAT MODE
The balance point (outside) temperature is not used in the
Emergency heat mode. When the comfort control is
moved to the Emergency Heat position, the compressor is
locked out. The first stage of heat is whatever is
connected to the X2 terminal. The second stage of heat is
what is connected to the W1 terminal. Often there is only
one source of non-compressor heat and the X2 terminal is
jumpered to the W1 terminal.
Heat Pump with Electric Auxiliary (Backup) Heat
and Outdoor Temperature Sensor
1. Choose correct heat pump application in Installer
Setup Number 0170.
2. Choose Electric as Auxiliary (Backup) Heat
Source in Installer Setup Number 0200.
3. Choose Outdoor Temperature Sensor for
Control Option in Installer Setup Number 0340.
4. Choose Compressor Lockout Temperature in
Installer Setup Number 0350.
5. Choose Auxiliary Lockout Temperature in
Installer Setup Number 0360.
NOTE: There is a 5°F deadband between the Compres-
sor and Auxiliary Heat Lockout Temperatures
OPERATION IN HEAT MODE
When the outdoor temperature is below the Compressor
Lockout Temperature, only the Auxiliary Heat operates.
When the outdoor temperature is above the Auxiliary
Lockout Temperature, only the Compressor operates.
See Fig. 21.
Fig. 21. Heat Pump Operation with Lockout
Temperatures Set.
When the outdoor temperature is between the two
temperatures, both the Compressor and Auxiliary Heat
operate.
OPERATION IN THE EMERGENCY HEAT MODE
Once the comfort control is placed into the Emergency
Heat mode, the compressor and auxiliary lockout features
are turned off. In the Emergency heat mode, the
compressor is locked out. The first stage of heat is
whatever is connected to the X2 terminal. The second
stage of heat is connected to the W1 terminal. Usually the
emergency and auxiliary heat sources are electric strip
heat in these cases.
Dehumidification Droop Control
The dehumidification control attempts to control to the
user's humidity setpoint by turning on the air conditioner.
In extremely high humidity conditions, the comfort control
keeps the air conditioner running for up to 3
°
F below the
temperature setpoint. It does this while trying to achieve
the desired humidity setpoint and balancing that with the
temperature setpoint.
35
M19950
COMPRESSOR
LOCKOUT
TEMPERATURE
AUXILIARY
LOCKOUT
TEMPERATURE
COMPRESSOR ONLY
BOTH COMPRESSOR AND
AUXILIARY HEAT
AUXILIARY ONLY
50
OUTDOOR TEMPERATURE