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ISU
Installer Setup
Number
Name
Thermostat (Internal)
9010
Which Sensor will be
used for
Sensor Name (Remote)
Dehumidification
Sensor Name (Remote)
Control?
Sensor Name (Remote)
Sensor Name (Remote)
Sensor Name (Remote)
Sensor Name (Remote)
(Up to 6 Remote Sensors)
Humidification Sensor
9020
Which Indoor
Humidity Sensor
Dehumidification Sensor
should be displayed
on the Home Screen?
None
9040
What Terminals are
Wired to A/C with
U1
Low Speed Fan?
U2
U3
What Terminals are
Wired to Hot Gas
Bypass?
What Terminals are
Wired to the
Dehumidifier?
What Terminals are
Wired to the Whole
House Dehumidifier?
Note: Installer Setup
Name varies
depending on the
dehumidification
equipment installed.
Normally Closed
9050
A/C with Low Speed
Fan Setup
Normally Open
Hot Gas Bypass
Setup
Note: Installer Setup
Name varies
depending on the
dehumidification
equipment installed.
THX9321 PRESTIGE
Table 4. Installer Setup (ISU) Table. (Continued)
Settings
Default
Thermostat
(Internal)
Humidification
Sensor
Thermostat
defaults to the
next unused
universal
terminal (U1,
U2, U3).
Defaults to
Normally Closed
when ISU 9000
Dehumidificatio
n Equipment is
A/C with Low
Speed Fan
Defaults to
Normally Open
when ISU 9000
Dehumidificatio
n Equipment is
Hot Gas Bypass
55
®
2.0 AND THX9421 PRESTIGE
Residential,
Commercial
Requires
or Both
EIM
Both
No
Select a sensor to control dehumidification
(thermostat or an optional remote sensor). If
multiple sensors are installed, you can use a
different sensor for humidification control. See
"Dehumidification control" beginning on
page 132.
Note: Humidity sensing cannot be averaged.
Both
No
This ISU is only displayed when separate
humidity sensors are used to control
humidification and dehumidification. Only one
of the sensors can be displayed on the home
screen. Select either the Humidification Sensor
or the Dehumidification Sensor.
Both
No
Number of Universal Outputs:
THX9321 Thermostat: U1 and U2 terminals
Equipment Interface Module (EIM): U1, U2 and
U3 terminals
U1, U2, U3 are dry contacts that require power.
See "Wiring IAQ Equipment or a Heat/Cool
Stage to the Universal Terminals" beginning on
page 152.
Both
No
Choose an option appropriate for the type of
equipment installed.
Normally Open: U1, U2 or U3 will normally be
open and will close when the thermostat calls
for dehumidification.
Normally Closed: U1, U2 or U3 will normally be
closed and will open when the thermostat calls
for dehumidification.
Number of Universal Outputs:
THX9321 Thermostat: U1 and U2 terminals
Equipment Interface Module (EIM): U1, U2 and
U3 terminals
®
IAQ WITH EIM
Notes
68-0311—07
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