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White rectangular mechanical thermostat with front dial and two side switches

Dayton

Dayton 1UHH3 Line Volt Mechanical Thermostat

SKU CH-736V-6WDM9

Controls heating or cooling systems from 30 to 110 °F with a 3.5 °F differential and SPDT switching up to 600 VAC

  • Type2 Stage Heating/Cooling
  • Wide 30–110 °F range covers heating and cooling needs
  • 16 A at 120 VAC handles heavy line-voltage loads
  • Two-stage SPDT switches give independent heat/cool control
  • 5 °F differential prevents short-cycling of equipment
  • Mechanical design needs no programming or external power

Two-Stage Line Voltage Thermostat

This Dayton 1UHH3 mechanical thermostat provides two-stage heating and cooling control for line-voltage systems. It operates across a 30 to 110 degrees Fahrenheit range with a 3.5 degree differential. The SPDT switch action opens or closes on temperature rise for direct equipment control.

Voltage and Amperage Compatibility

Verify that the supply voltage falls between 24 and 600 VAC before installation. The contact rating is 16 amps at 120 VAC and 8 amps at 240 VAC full load. Ensure the connected load does not exceed these limits for the intended voltage.

Passive Mechanical Operation

The unit uses a mechanical sensing element with 3 degree sensitivity and requires no external power for its switching function. It produces no fan noise and adds negligible heat to the enclosure. The non-programmable design maintains a fixed setpoint without digital circuitry.

Highlights

  • Wide 30–110 °F range covers heating and cooling needs
  • 16 A at 120 VAC handles heavy line-voltage loads
  • Two-stage SPDT switches give independent heat/cool control
  • 5 °F differential prevents short-cycling of equipment
  • Mechanical design needs no programming or external power

Specifications

BrandDAYTON
Type2 Stage Heating/Cooling

Questions about this item

What comes with the Dayton 1UHH3 thermostat and what must be purchased separately?

The unit includes the thermostat body with two SPDT switches and mounting hardware. Wiring, conduit, and a separate temperature sensor are not included and must be supplied by the installer.

Which version of the Dayton 1UHH3 should I choose for a 240 VAC heating circuit?

This model operates on 24 to 600 VAC and is rated 8 A at 240 VAC, making it suitable for direct line-voltage control of 240 VAC heating loads.

What does the 3.5 °F differential mean when the thermostat is controlling a heater?

The contacts open when the temperature rises 3.5 °F above the set point and close again when it falls 3.5 °F below, giving a 7 °F total swing around the chosen setting.

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