Honeywell Prestige 2.0 THX9421 Manual page 25

ISU Installer Setup
Number Name
None
2050 Geothermal Forced
Air System Used for Cooling Only
Used for Heating and Cooling
O (O/B on Cool)
2060 Reversing Valve
O/B B (O/B on Heat)
1-4
2070 Cool Stages /
Compressor Stages
1 - 3
2020, Heat Stages /
2070 Backup Heat Stages
None
2080 What Terminals are
Wired to Cool - Stage U1
3?
U2
U3
THX9321 PRESTIGE
Table 4. Installer Setup (ISU) Table. (Continued)
Settings Default
Used for Heating
and Cooling
O/B on Cool
1 if ISU 1010 is
Residential
2 if ISU 1010 is
Commercial
Default is 1
stage if ISU
1010
Application is
Residential
Default is 2
stages if ISU
1010
Application is
Commercial
Default varies
based on
previous
selections
25
®
2.0 AND THX9421 PRESTIGE
Residential,
Commercial Requires
or Both EIM
Both 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.
Both No Only displayed if the equipment type is Air to
Air Heat Pump, Geothermal Heat Pump or
Geothermal Radiant Heat.
Both 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.
Both No Maximum of 3 Heat Stages for conventional
systems.
Maximum of 2 Backup Heat Stages for systems
with more than 1 heating equipment type.
Commercial 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
Notes
68-0311—07