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Good to Know

Honeywell Modulating Thermostats

Honeywell ZonePRO™ Digital Thermostats

The TB6980/TB7980 Zone PRO™ digital thermostats provide proportional plus integral individual space temperature control in zoned commercial HVAC systems such as Hydronic and pressure dependent VAV with or without reheat and V.V.T. systems.

Depending on the model, the thermostat can have up to three outputs that can be used for the following applications: Floating or Modulating damper/ valve actuator control Damper/valve actuator control with duct reheat and auxiliary heat (B models only) Hydronic systems (room control, TB6980 perimeter heating and cooling)

Part # Float 0-10/2-10Vdc Triac Accessory  
32004800-001 - - - Bare thermistor Call... Add to Order
T7770A3002 - - - Remote room sensor Call... Add to Order

Honeywell Proportioning Thermostats

These temperature controls utilize a potentiometer circuit to provide proportioning control. Standard circuit is 135 ohm.

Part # Power Signal Features  
T641A1005 24 Vac Floating Blank locking cover Call... Add to Order
T641A1021 25 Vac Floating External Set Point Call... Add to Order
T921G1005 - 136 ohm potentiometer - Call... Add to Order

Honeywell Modulating Remote BulbTemperature Controls

Remote bulb thermostats modulate temperature of air of liquids in ducts, pipes, tanks and boilers.

Part # Range Throttling Range Pot Element  
T991A1269 55-175 F 3-36 280 ohm 20 ft. Call... Add to Order
T991A1343 55-175 F 3-36 280 ohm 5 ft. Call... Add to Order
T991A1350 55-175 F 3-36 135 ohm 24 ft. Averaging Call... Add to Order
T991B1003 70-140 F 3-30 135 ohm 1 to 1 Reset Ratio Call... Add to Order