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THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ 2.0 WITH EIM
68-0311—01 20
2190 External Fossil Fuel
Kit
Thermostat Controls Backup Heat
External Fossil Fuel Kit Controls
Backup Heat
Thermostat
Controls Backup
Heat
Both No This ISU is only displayed when ISU 2010 Heating
Equipment Type is Air to Air Heat Pump,
Geothermal Heat Pump or Geothermal Radiant
Heat and ISU 2180 Backup Heat Type is Standard
Efficiency Gas Forced Air, High Efficiency Gas
Forced Air or Oil Forced Air.
2200 Backup Heat
Operation
NOT allowed to Run with Heat
Pump
Allowed to Run with Heat Pump
Default varies
based on
previous
selections
Both No This ISU is only displayed when ISU 2010 Heating
Equipment Type is Air to Air Heat Pump,
Geothermal Heat Pump or Geothermal Radiant
Heat and ISU 2180 Backup Heat Type is Hot Water
Fan Coil or Other.
Not Allowed to Run with Heat Pump: The
thermostat turns off the heat pump when it calls for
backup heat.
Allowed to Run with Heat Pump: The thermostat
keeps the heat pump on when it calls for backup
heat.
2210 Backup Heat Fan
Operation
No Fan
Equipment Controls Fan
Thermostat Controls Fan
Default varies
based on
previous
selections
Both No This ISU is only displayed for heat pumps when ISU
2180 Backup Heat Type is Other.
Backup Heat Fan Operation:
Electric Forced Air: Thermostat Controls Fan
Standard Efficiency Gas Forced Air: Equipment
Controls Fan
High Efficiency Gas Forced Air: Equipment Controls
Fan
Oil Forced Air: Equipment Controls Fan
Hot Water Fan Coil: Thermostat Controls Fan
Hot Water Radiant Heat: Not Applicable
2220 A-L/A Terminal Setup None
Time Of Day
Economizer
Heat Pump Failure Indication
None Commercial No This ISU is only displayed when ISU 1010
Application is Commercial.
None: The A-L/A terminal is not used.
Time of Day: The A-L/A terminal is energized during
Occupied periods and when the user overrides the
temperature. The terminal is de-energized during
Unoccupied periods and in Standby mode.
Economizer: The thermostat controls an
economizer module to provide ventilation during
Occupied periods and free cooling when outdoor
conditions are favorable. The A-L/A terminal is
energized during Occupied periods and during a call
for cooling in Unoccupied periods. See “Economizer
and Time of Day (TOD) Operation” beginning on
page 91.
Notes: The economizer module determines when
outdoor conditions are favorable for free cooling.
Delta T Diagnostics is not available when the
thermostat is setup for an Economizer.
Heat Pump Failure Indication: When 24 volts is
detected on the L/A terminal (compressor monitor),
the thermostat displays a message to alert the user
when the heat pump requires service. The L/A
terminal sends a continuous output to a zone panel
when the thermostat is set to Emergency Heat
mode. The zone panel will not turn on the heat
pump when a zone is set to Emergency Heat mode.
3000 Changeover Manual
Automatic
Manual:
if ISU 1010 is
Residential
Automatic:
if ISU 1010 is
Commercial
Both No Manual: The user must select heating or cooling as
needed to maintain the desired indoor temperature.
Automatic: The user has the option to select Auto
for the system setting. In Auto mode, the
thermostat controls heating and cooling equipment
as needed to maintain the desired indoor
temperature.
Table 2. Installer Setup (ISU) Table. (Continued)
ISU
Number Installer Setup Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes