Honeywell Prestige 2.0 THX9421 Manual page 28

®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
ISU Installer Setup
Number Name
2170 What Terminals are
Wired to Backup
Heat - Stage 2?
2180 Backup Heat Type
2190 External Fossil Fuel
Kit
2200 Backup Heat
Operation
2210 Backup Heat Fan
Operation
68-0311—07
®
Table 4. Installer Setup (ISU) Table. (Continued)
Settings
None
U1
U2
Electric Forced Air
Standard Efficiency Gas Forced Air
High Efficiency Gas Forced Air
Oil Forced Air
Hot Water Fan Coil
Hot Water Radiant Heat
Other
Thermostat Controls Backup Heat
External Fossil Fuel Kit Controls
Backup Heat
NOT allowed to Run with Heat
Pump
Allowed to Run with Heat Pump
No Fan
Equipment Controls Fan
Thermostat Controls Fan
IAQ WITH EIM
Residential,
Commercial
Default or Both
Default varies Both
based on
previous
selections
Electric Forced Both
Air
Thermostat Both
Controls Backup
Heat
Default varies Both
based on
previous
selections
Default varies Both
based on
previous
selections
28
Requires
EIM Notes
No THX9321 Thermostat Only:
This ISU is only displayed on the THX9321
thermostat when it is wired directly to the
equipment (Equipment Interface Module is
NOT used).
The thermostat can support up to 2 backup
heat stages for heat pump applications. When
there are 2 backup heat stages, backup heat
stage 2 must be wired to U1 or U2.
U1 and U2 are normally open dry contacts
when configured for a stage of Heat. U1 and U2
require power from a system transformer or a
separate transformer.
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 there is at least one stage of
backup heat.
See "Heat Pump and Backup Heat Operation"
beginning on page 100.
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.
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.
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