Honeywell T921 Catalog Page
Proportional Thermostats
T921 Proportional Thermostats
Proportional Thermostats provide low voltage, 3-wire control for
valve motors, damper motors, and balancing relays in heating or
cooling system applications.
• Bellows element adjusts potentiometer slider to regulate motor operation
• Removable setting knob prevents unauthorized tampering with setpoint
Dimensions, Approximate: 5 11/16 in. high x 3 3/8 in. wide x 2 1/4 in.
deep (144 mm high x 86 mm wide x 58 mm deep)
Mounting: Wall mount
Throttling Range: 2.5 F (1.4 C)
Setpoint Temperature Range
Product Number
T921A1183/U — 13 C to 29 C 135 Ohm potentiometer Celsius model
* T921A1191/U 56 F to 84 F — 135 Ohm potentiometer * model which includes slotted sides and an add-on faceplate
T921G1005/U 56 F to 84 F — 135 Ohm potentiometer —
* TRADELINE models • SUPER TRADELINE models
Proportional Thermostat Parts and Accessories
Product Number Description Used With
100653A/U Potentiometer Assembly for use with T921 T921
130224/U Knob - Adjusting —
4074BKB/U Envelope assembly for T921 —
50014156-002/U Remote room sensor for the ZonePRO® ZonePRO
50014157-001/U Duct temperature sensor for the ZonePRO® ZonePRO
Output Signal Includes(F) (C)
to allow thermostat to be mounted horizontally
®
ZonePRO
Dimensions, Approximate: 2 5/8 in. wide X 4 9/16 in. high X 1 in. deep
(69 mm wide X 118 mm high X 27 mm deep)
Mounting: Wall mount
Product Number
TB6980A1007/U 50F to 95F 10C to 35C Floating 0.5A max @ 24Vac — Floating control
TB6980B1006/U 50F to 95F 10C to 35C Floating 0.5 A max @ 24Vac 1 An alog/TRIAC1 TRIAC Floating control with 2 additional outputs
TB7980A1006/U 50F to 95F 10C to 35C 0-10 Vdc or 2-10 Vdc 0-10V, 10k min — Modulating (0-10Vdc) control
TB7980B1005/U 50F to 95F 10C to 35C 0-10 Vdc or 2-10 Vdc 0.5A max @ 24Vac 1 Analog/TRIAC1 TRIAC Modulating (0-10Vdc) control with 2
Modulating/Floating Control Thermostats
The ZonePRO® thermostats are for low-voltage pressuredependent variable air volume (VAV) applications. ZonePRO can
also be used for hydronic perimeter heating/cooling and bypass
box with or without reheat. The four models cover modulating
applications, floating applications and applications that require
up to two additional outputs for reheat.
• Provides modulating (2 to 10 Vdc analog) control (TB7980)
• Provides floating control (TB6980)
• Provides 2 additional outputs (TB6980B and TB7980B)
• Provides max. and min. setpoints for heating and cooling
• Provides a night setback (NSB) terminal for energy savings
Power Supply: 24 Vac
Frequency: 60 Hz
Setpoint Temperature Range
Output Signal
Output Signal
Burden Additional Outputs Description(F) (C)
additional outputs
500 customer.honeywell.com 70-6910
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