Spec Sheet

THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ WITH EIM
3 68-0311—07
SPECIFICATIONS
Thermostat Description:
Electrical Ratings for:
Equipment Interface Module and the THX9321 Prestige
2.0 Thermostat
NOTE: To find what terminals are available on the Equip-
ment Interface Module and the Prestige Thermo-
stats, see “Terminal Designations” below the
table.
Terminal Designations:
— Equipment Interface Module: R, RC, RH, C, W-O/B,
W2-AUX 1, W3-AUX 2, Y, Y2, G, A-L/A, U1 U1, U2
U2, U3 U3, S1 S1, S2 S2, S3 S3, S4 S4, A, B, C, D
— THX9421 Thermostat: R, C
— THX9321 Thermostat: R, RC, C, W-O/B, W2-AUX/E,
Y, Y2, G, A-L/A, K, U1 U1, U2 U2
Power Consumption of THX9421/THX9321:
Full brightness = 3.0 VA
1/2 brightness = 2.1 VA
Backlight off = 1.9 VA
RedLINK Communication:
Frequency: 900 Mhz frequency range
Re-Sync Time: RedLINK devices re-establish communica-
tion within 6 minutes after AC power resumes.
Temperature Setting Range:
Heating: 40 to 90 °F (4.5 to 32 °C).
Cooling: 50 to 99 °F (10 to 37 °C).
Temperature Sensor Accuracy: ± 1.5 °F at 70 °F (0.75 °C
at 21.0 °C)
Humidification Setting Range:
10% to 60% RH.
Dehumidification Setting Range:
40% to 80% RH.
Humidity Display Range:
0% to 99%.
Humidity Sensor Accuracy: ± 5% RH from 30% to 50%
RH at 75 °F (24 °C).
Cool Indication:
Prestige 2.0 and Prestige IAQ displays “Cool On” when the
thermostat turns the cooling on.
Heat Indication:
Prestige 2.0 and Prestige IAQ displays “Heat On” when the
thermostat turns the heating on.
Auxiliary Heat Indication:
Prestige 2.0 and Prestige IAQ displays “Auxiliary Heat On”
when the thermostat turns the auxiliary heat on.
Interstage Differential:
Comfort: The thermostat keeps the indoor temperature
within 1 degree of the setpoint (droop less control). The
thermostat turns on stage 2 when the capacity on stage
1 reaches 90%.
When the interstage differential is set to 1.0 or higher, the
thermostat stages the equipment based on how far the
indoor temperature is from the setpoint (ISU 3030 to
3090). See page 31 for more information.
Clock Accuracy: ± 1 minute per month at 77 °F (25 °C). ±
2 minutes per month over the operating ambient tem-
perature range.
Mounting Means:
Thermostat mounts directly on the wall in the living space
using mounting screws and anchors provided. Fits a
horizontal 2 x 4 in. junction box.
Equipment Interface Module (EIM) mounts on HVAC
equipment or on a wall in the equipment room.
Feature Description
Powering method • Common wire only
System types (up
to 4 heat/2 cool
heat pump and up
to 3 heat/2 cool
conventional)
• Gas, oil or electric heat with air
conditioning
• Warm air, hot water, high-
efficiency furnaces, heat pumps,
steam and gravity
• Cool only
Changeover Manual or Auto changeover
selectable
System setting Em Heat-Heat-Off-Cool-Auto
Fan setting Auto-On-Circ-Follow Schedule
Terminal
Voltage
(50/60 Hz)
Max. Current
Rating
W - O/B 18 to 30 VAC 1.00A
Y (cooling) 18 to 30 VAC 1.00A
G (fan) 18 to 30 VAC 0.50A
W2 - Aux 1 (heating) 18 to 30 VAC 0.60A
W3 - Aux 2 (heating) 18 to 30 VAC 0.60A
Y2 (cooling) 18 to 30 VAC 0.60A
A-L/A (Output) 18 to 30 VAC 1.00A
U1, U1
U2, U2
U3
, U3
18 to 30 VAC 0.50A