Honeywell THX9321 Prestige 2.0 Product Data page 25

ISU Installer Setup
Number Name
2050 Geothermal Forced
Air System
2060 Reversing Valve
O/B
2070 Cool Stages /
Compressor
Stages
2020, Heat Stages /
2070 Backup Heat
Stages
2080 What Terminals are
Wired to Cool -
Stage 3?
Table 4. Installer Setup (ISU) Table. (Continued)
Settings
None
Used for Cooling Only
Used for Heating and Cooling
O (O/B on Cool)
B (O/B on Heat)
1-4
1 - 3
None
U1
U2
U3
®
THX9321 PRESTIGE 2.0 AND THX9421 PRESTIGE
Residential,
Commercial
Default or Both
Used for Both
Heating and
Cooling
O/B on Cool Both
1 if ISU 1010 is Both
Residential
2 if ISU 1010 is
Commercial
Default is 1 Both
stage if ISU
1010
Application is
Residential
Default is 2
stages if ISU
1010
Application is
Commercial
Default varies Commercial
based on
previous
selections
25
Requires
EIM Notes
No This thermostat has the capability of
controlling Geothermal Radiant Heat,
Geothermal Forced Air and Backup Heat.
If this thermostat is not controlling the
Geothermal Forced Air System, select
None. This setting is typically used if the
thermostat is only controlling Geothermal
Radiant Heat.
If this thermostat is using the Geothermal
Forced Air System for cooling and not for
heating, select Used for Cooling Only.
If this thermostat is using the Geothermal
Forced Air System for both heating and
cooling, select Used for Heating and
Cooling.
No Only displayed if the equipment type is Air
to Air Heat Pump, Geothermal Heat Pump
or Geothermal Radiant Heat.
No Conventional:
Cool Stage 3 and 4 are only available if ISU
1010 is Commercial.
Cool Stage 3 and 4 must be wired to a
universal terminal (U1, U2 or U3).
Heat Pumps:
Maximum of 2 Compressor Stages for heat
pump systems.
No Maximum of 3 Heat Stages for
conventional systems.
Maximum of 2 Backup Heat Stages for
systems with more than 1 heating
equipment type.
No Cool Stage 3 is only available if ISU 1010 is
Commercial.
Cool Stage 3 must be wired to a universal
terminal (U1, U2 or U3).
U1, U2 and U3 are normally open dry
contacts when configured for a stage of
Cool. U1, U2 and U3 require power from a
system transformer or a separate
transformer.
U3 is only available on the Equipment
Interface Module (EIM).
®
IAQ WITH EIM
68-0311—02