Honeywell Prestige 2.0 THX9421 Manual page 27

ISU Installer Setup
Number Name
0 - 2
2130 Backup Heat Stages
None
2140 What Terminals are
Wired to Backup U1
Heat?
U2
NOT Allowed to Run with Primary
2150 Backup Heat
Heat
Operation
Allowed to Run with Primary Heat
No Fan
2160 Backup Heat Fan
Operation Equipment Controls Fan
Thermostat Controls Fan
THX9321 PRESTIGE
Table 4. Installer Setup (ISU) Table. (Continued)
Settings Default
1
Default varies
based on
previous
selections
NOT allowed to
run with Primary
Heat
Thermostat
Controls Fan
27
®
2.0 AND THX9421 PRESTIGE
Residential,
Commercial Requires
or Both EIM
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.
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).
The thermostat can support up to 3
conventional heat stages. When there are a
total of 3 conventional heat stages, the last
stage of heat 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.
Both No This ISU is only displayed when ISU 2010
Heating Equipment Type is Hot Water Fan Coil,
Electric Forced Air or Other.
When ISU 2010 Heating Equipment Type is
Hot Water Fan Coil, Electric Forced Air or Other,
you can select how the Backup Heat operates.
The thermostat can be setup to keep the
primary heat source on when it calls for Backup
Heat or the thermostat can be setup to turn off
the primary heat source when it calls for
Backup Heat.
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.
Both No This ISU is only displayed for conventional
systems when ISU 2120 Backup Heat Type is
Electric Forced Air, Hot Water Fan Coil or Other.
Backup Heat Fan Operation automatically
defaults to Equipment Controls Fan when ISU
2120 Backup Heat Type is Standard Efficiency
Gas Forced Air, High Efficiency Gas Forced Air
or Oil Forced Air.
No Fan is only displayed when ISU 2120
Backup Heat Type is Other.
®
IAQ WITH EIM
Notes
68-0311—07