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THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ 2.0 WITH EIM
68-0311—01 18
2080 What Terminals are
Wired to Cool - Stage
3?
None
U1
U2
U3
Default varies
based on
previous
selections
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).
2090 What Terminals are
Wired to Cool - Stage
4?
None
U1
U2
U3
Default varies
based on
previous
selections
Commercial No Cool Stage 4 is only available if ISU 1010 is
Commercial.
Cool Stage 4 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).
2100 What Terminals are
Wired to Heat - Stage
3?
None
U1
U2
U3
Default varies
based on
previous
selections
Both 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).
Heat Stage 3 must be wired to a universal terminal
(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.
2110 Fan Operation in Heat No Fan
Equipment Controls Fan
Thermostat Controls Fan
Thermostat
Controls Fan
Both No This ISU is only displayed when ISU 2010 Heating
Equipment Type is Electric Forced Air, Hot Water
Fan Coil or Other.
The thermostat automatically defaults to Equipment
Controls Fan when ISU 2010 Heating Equipment
Type is Standard Efficiency Gas Forced Air, High
Efficiency Gas Forced Air or Oil Forced Air.
No Fan is only displayed when ISU 2010 Heating
Equipment Type is Other.
2120 Backup Heat Type None
Standard Efficiency Gas Forced Air
High Efficiency Gas Forced Air
Oil Forced Air
Electric Forced Air
Hot Water Fan Coil
Hot Water Radiant Heat
Other
None Both No This ISU is only displayed when ISU 2010 Heating
Equipment Type is Hot Water Radiant Heat,
Steam, Hot Water Fan Coil, Electric Forced Air or
Other.
The list of Backup Heat Types will vary based on the
type of primary heat selected at ISU 2010 Heating
Equipment Type.
When ISU 2010 Heating Equipment Type is Hot
Water Radiant Heat, the thermostat keeps the Hot
Water Radiant Heat on when it calls for Backup
Heat.
When ISU 2010 Heating Equipment Type is Steam,
the thermostat keeps the Steam Heat on when it
calls for Backup Heat.
When ISU 2010 Heating Equipment Type is Hot
Water Fan Coil, Electric Forced Air or Other, you
can select how the backup operates. See ISU 2150
Backup Heat Operation.
2130 Backup Heat Stages 0 - 2 1 Both No This ISU is only displayed when a backup heat
source is selected at ISU 2120 Backup Heat Type.
Maximum of 2 Backup Heat stages.
Table 2. Installer Setup (ISU) Table. (Continued)
ISU
Number Installer Setup Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes