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Ranco C17-100 mechanical thermostat with long capillary bulb and SPDT switch contacts

Ranco

Ranco C17-100 Line Volt Mechanical Thermostat SPDT

SKU CH-Q1PG-HCADE

A line-voltage mechanical thermostat with SPDT switching, 26-inch capillary, and 3.5 °F constant differential for heating and cooling control

  • Controls cooling from 71 to 101 °F
  • Manages heating between 64 and 94 °F
  • SPDT contacts switch two circuits
  • 5 °F constant differential prevents short cycling
  • 26 in capillary allows remote sensing

Mechanical line-volt thermostat

The Ranco C17-100 is a mechanical line-voltage thermostat built for direct control of heating and cooling equipment. Its SPDT switching and dual-stage capability suit contractors and facility managers who need reliable temperature regulation without external power supplies. The bulb-and-capillary sensing element responds directly to ambient conditions, making it a practical choice for commercial HVAC units, refrigeration systems, and agricultural ventilation where simplicity and durability are required.

Temperature ranges and electrical capacity

The cooling range spans 71 to 101 degrees Fahrenheit while the heating range covers 64 to 94 degrees Fahrenheit, with a constant 3.5-degree differential that prevents short-cycling. Electrical ratings reach 20 amps at 125 and 240 volts and 16 amps at 277 volts, giving headroom for typical single-phase motors and resistance heaters. Loads exceeding these ampacities or applications needing tighter differentials will require a different control strategy.

Bulb and capillary installation

A 3/8-inch diameter bulb measuring 8 9/16 inches long connects via a 26-inch capillary tube, allowing the sensing element to be placed in the airstream while the switch housing mounts on the unit. The package includes no additional brackets, wiring harnesses, or digital interfaces, so installers must supply mounting hardware and conduit. Systems requiring remote displays, programmable schedules, or communication protocols are not addressed by this mechanical device.

Highlights

  • Controls cooling from 71 to 101 °F
  • Manages heating between 64 and 94 °F
  • SPDT contacts switch two circuits
  • 5 °F constant differential prevents short cycling
  • 26 in capillary allows remote sensing

Specifications

BrandRANCO

Questions about this item

Will the Ranco C17-100 SPDT thermostat control my existing 240 V compressor that draws 16 amps?

Yes, the contacts are rated 20 A at 240 V, so a 16 A compressor is within the full-load rating.

How can I verify the constant 3.5 °F differential is operating correctly after installation?

Measure the temperature at which the switch opens on rise and the temperature at which it closes on fall; the difference should be 3.5 °F.

Does the box include a mounting bracket or wiring harness, or must I supply them?

The specifications list no included accessories, so expect to provide mounting hardware and wiring separately.

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