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Brown rectangular mechanical thermostat with front dial, SPDT switch visible inside

Johnson Controls Inc

Johnson Controls Inc T26T-3C Line Volt Mechanical Thermostat

SKU CH-KCMD-H4MHF MPN T26T-3C

Line-voltage mechanical thermostat with SPDT switching, 40–90 °F range, 24–277 V AC operation, 0.7 °F differential and two switches

  • TypeLearning Thermostats
  • ColorBrown
  • Controls heating from 40 to 90 °F with bi-metal sensor
  • SPDT switch opens or closes on temperature rise and fall
  • Rated 15 A at 120 V AC and 3 A at 240 V AC
  • Operates on 24 to 277 V AC line voltage
  • Fixed 0.7 °F differential gives consistent cycling

Line-Voltage Mechanical Thermostat

The Johnson Controls T26T-3C is a mechanical line-voltage thermostat designed for heating-only applications. It operates across a 24 to 277V AC range with a control span of 40 to 90 degrees Fahrenheit. The unit uses a bi-metal sensor and features two SPDT switches with a 0.7 degree differential.

Build Integration and Wiring

The thermostat mounts in a standard enclosure measuring 5 by 3 by 3 inches and requires no separate low-voltage transformer. It switches heating loads directly at 15 amps at 120VAC or 3 amps at 240VAC. No remote sensing bulb is included, so the device must be located in the space it controls.

Suitability and Limits

This thermostat suits installers needing a simple, non-programmable line-voltage control for electric heat. It is not suited for systems requiring cooling control, programmable schedules, or remote temperature sensing. Buyers needing multi-stage heating or smart-home integration should look at other devices.

Highlights

  • Controls heating from 40 to 90 °F with bi-metal sensor
  • SPDT switch opens or closes on temperature rise and fall
  • Rated 15 A at 120 V AC and 3 A at 240 V AC
  • Operates on 24 to 277 V AC line voltage
  • Fixed 0.7 °F differential gives consistent cycling

Specifications

BrandJohnson Controls
ModelT26T-3C
TypeLearning Thermostats
ColorBrown

Questions about this item

At what temperature does the differential limit how closely the thermostat can maintain the set point under sustained use?

The differential is 0.7 degrees Fahrenheit, so the switch will not cycle again until the temperature moves that far past the set point.

What are the full-load amp ratings when the thermostat runs all day on a 120 V or 240 V circuit?

It handles 15 amps at 120 VAC and 3 amps at 240 VAC continuously.

What voltage supply must the installation already provide for this line-voltage thermostat to operate?

The unit works on any AC supply from 24 volts up to 277 volts.

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