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Gray rectangular line-voltage thermostat with temperature dial and remote sensing bulb

Johnson Controls Inc

Johnson Controls A70BA-18C thermostat 15-55°F 120-600VAC

SKU CH-VN5E-XQ396

A line-voltage mechanical thermostat that switches heating or cooling loads from 120 to 600 VAC with a 15 to 55 °F set range and a 5 °F differential

  • Product typeLearning Thermostats
  • Product colorGray
  • Controls 15–55 °F for precise low-temperature regulation
  • Handles 120–600 VAC across residential and commercial circuits
  • SPST switch closes on rise for reliable cooling activation
  • Remote sensing bulb included for accurate area temperature detection
  • 5 °F differential prevents short-cycling and extends equipment life

Line-voltage mechanical thermostat

The Johnson Controls A70BA-18C is a line-voltage mechanical thermostat designed for heat or cool applications. It operates across a 120 to 600 VAC supply range and includes a remote sensing bulb. This device suits installers controlling electric heaters or cooling equipment directly on mains voltage.

Sustained load behaviour

The SPST switch closes on temperature rise with a fixed 5 °F differential. At 120 VAC the main contacts carry 16 A and the auxiliary contacts 6 A. At 240 VAC the ratings drop to 8 A main and 3 A auxiliary, so continuous operation stays within these limits.

Pre-installation checks

Verify that the supply voltage falls between 120 and 600 VAC and that the load current does not exceed the stated amp ratings for the applicable voltage. Confirm the 15 °F to 55 °F control range matches the required set-points and that the 3-1/4 in. by 4 in. footprint fits the mounting location.

How it compares

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

Price $188.99
Pricier than about 82% of the 286 comparable items (median $78.49).

Specifications

Product
Brand nameJOHNSON CONTROLS
Product typeLearning Thermostats
Product colorGray

Questions about this item

Does the A70BA-18C run silently or produce any heat during continuous operation?

The mechanical line-voltage thermostat has no fan or active electronics, so it generates no audible noise and negligible heat while controlling loads up to 16 A at 120 VAC or 8 A at 240 VAC.

What wiring and mounting must already be in place for the A70BA-18C to function?

A 120-600 VAC circuit, a standard junction box for the 3-1/4 x 4 x 2-3/32 in. body, and the included remote sensing bulb positioned in the controlled space are required.

Can the A70BA-18C replace an older SPST line-voltage thermostat on the same 120-600 VAC circuit?

Yes, it uses a single SPST switch with a 5 °F differential and close-on-rise action, matching typical legacy line-voltage controls.

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