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THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ 2.0 WITH EIM
68-0311—01 40
9040 What Terminals are
Wired to A/C with
Low Speed Fan?
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.
None
U1
U2
U3
Thermostat
defaults to the
next unused
universal
terminal (U1, U2,
U3).
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 guide — IAQ Equipment (EIM or
Thermostat)” beginning on page 115.
9050 A/C with Low Speed
Fan Setup
Hot Gas Bypass
Setup
Note: Installer Setup
Name varies
depending on the
dehumidification
equipment installed.
Normally Closed
Normally Open
Defaults to
Normally Closed
when ISU 9000
Dehumidification
Equipment is A/C
with Low Speed
Fan
Defaults to
Normally Open
when ISU 9000
Dehumidification
Equipment is Hot
Gas Bypass
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
9070 Dehumidification -
Overcooling Limit
0°, 1°, 2°, 3° F 3° F Residential No This ISU is only displayed when ISU 9000
Dehumidification Equipment is set to A/C with Low
Speed Fan or A/C with High Speed Fan.
The thermostat uses the cooling system to reduce
humidity by lowering the temperature up to 3° F
below the current cool setpoint until the desired
humidity level is reached.
The thermostat keeps the temperature below the
cooling setpoint until the desired humidity level is
reached.
0° F is only an option when ISU 9000
Dehumidification Equipment is set to A/C with Low
Speed Fan.
9080 Dehumidification
Control
Basic
Minimum On Time
High Humidity Comfort Reset
High Humidity Comfort Reset with
Minimum On Time
Reheat
Reheat with Minimum On Time
Basic Commercial No See “Dehumidification - Commercial” beginning on
page 70.
9090 Dehumidification
Minimum On Time
5 to 15 minutes 10 minutes Commercial No This option ensures that the compressor runs long
enough to effectively reduce humidity when the
cooling equipment is cycled on. The compressor
will run for the “minimum on time” you set until the
desired humidity level is reached.
Table 2. Installer Setup (ISU) Table. (Continued)
ISU
Number Installer Setup Name Settings Default
Residential,
Commercial
or Both
Requires
EIM Notes