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Gray rectangular mechanical thermostat with dial and SPDT switch visible

Johnson Controls Inc

Johnson Controls A19BBC-4C Line Voltage Mechanical Thermostat

SKU CH-HZWD-ANBSV

A line-voltage mechanical thermostat controlling heating or cooling from -30 to 100 °F with a 3 to 12 °F differential and 16 A at 120 VAC

  • Product typeLearning Thermostats
  • Product colorGray
  • Mechanical reliability with no programming needed
  • SPDT switch handles heating or cooling loads
  • Wide control range from -30°F to 100°F
  • Rated 16 A at 120 VAC and 8 A at 240 VAC
  • Adjustable differential between 3°F and 12°F

Johnson Controls Line Voltage Thermostat

This Johnson Controls A19BBC-4C is a mechanical line-voltage thermostat built for direct control of heating or cooling equipment. It suits installers and facility managers who need a simple, non-programmable switch for 120 to 277 VAC circuits. The SPDT switch opens or closes on temperature rise across a -30 to 100 degrees F range.

SPDT Switch Rating 16A at 120VAC

The single specification that decides fit is the switch rating: 16 full-load amps at 120 VAC and 8 amps at 240 VAC. This SPDT action handles one heating or cooling load directly without a contactor. Buyers whose equipment draws more current or requires multi-stage control will need a different device.

Fixed Differential 3 to 12 Degrees F

The thermostat ships with a fixed differential adjustable between 3 and 12 degrees F and no remote sensing bulb. This means the unit cycles the load based on local temperature only, with no programmable schedules or remote monitoring. Installers requiring tighter differential control or remote sensor capability must select another model.

How it compares

Measured against everything we stock in Thermostats & Thermostat Accessories, at today’s prices. Recalculated every night.

Price $147.99
Pricier than about 75% of the 286 comparable items (median $78.49).

Specifications

Product
Brand nameJOHNSON CONTROLS
Product typeLearning Thermostats
Product colorGray

Questions about this item

What does the -30°F to 100°F control range mean for daily use?

The thermostat can maintain temperatures from -30°F up to 100°F, so it handles both deep-freeze and moderate heating or cooling tasks in a single unit.

How does the 120–277VAC line-voltage rating limit where I can install it?

It connects directly to 120VAC, 240VAC or 277VAC circuits without a transformer, but it cannot be used on low-voltage control wiring.

Will the 4-3/8" × 2-1/8" × 1-13/16" body fit a standard junction box?

The compact housing is designed to mount on a standard 2 × 4 inch handy box or similar enclosure with the included hardware.

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