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Ranco C12-5010 mechanical thermostat with coiled capillary and bulb sensor

Ranco

Ranco C12-5010 Line Volt Mechanical Thermostat SPDT

SKU CH-T91R-Z73RK

Line-voltage mechanical thermostat with SPDT switching, 60–98 °F cooling range and 36 in capillary

  • Controls temperature from 60 to 98 °F with a 3 °F differential
  • SPDT switching handles 16 A at 277 V and 20 A at 125/240 V
  • 36 in capillary and 9 in bulb fit tight equipment spaces
  • Mechanical line-voltage design needs no external power supply
  • Single-stage on/off action simplifies wiring for cooling systems

Line Volt Mechanical Thermostat SPDT

The Ranco C12-5010 is a line voltage mechanical thermostat designed for single stage HVAC control. It uses a SPDT contact form to open or close on temperature rise. The unit suits cooling applications with a range from 60 to 98 degrees Fahrenheit. It is not intended for heating control or multi stage systems.

Capillary Bulb Sensor Limits

Temperature sensing relies on a 3/8 inch diameter bulb that is 9 inches long, connected by a 36 inch capillary tube. The constant differential is fixed at 3 degrees Fahrenheit. Full load current ratings are 16 amps at 277 volts, and 20 amps at both 125 and 240 volts. Exceeding these electrical limits or the cooling range will cause unreliable operation.

Surface Mount Installation Notes

The control measures 3 inches in overall height and length for on unit mounting. Wiring must match the SPDT configuration and the applicable voltage rating for the circuit. A common error is applying the thermostat to heating circuits or loads beyond the stated ampere limits. The fixed differential cannot be adjusted in the field.

Highlights

  • Controls temperature from 60 to 98 °F with a 3 °F differential
  • SPDT switching handles 16 A at 277 V and 20 A at 125/240 V
  • 36 in capillary and 9 in bulb fit tight equipment spaces
  • Mechanical line-voltage design needs no external power supply
  • Single-stage on/off action simplifies wiring for cooling systems

Specifications

BrandRANCO

Questions about this item

Should I choose the 16 A at 277 V or the 20 A at 125 V rating for my circuit?

Use the 16 A rating on 277 V circuits and the 20 A rating on 125 V or 240 V circuits; the thermostat is rated for both.

What does the 60 to 98 °F cooling range mean once the unit is installed?

The switch will open or close on temperature rise anywhere between 60 °F and 98 °F with a fixed 3 °F differential.

How does the SPDT contact form affect wiring options?

SPDT provides one common, one normally open and one normally closed terminal, so the thermostat can control either a heating or a cooling load.

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