Johnson Controls Inc
Johnson Controls A70BA-18C thermostat 15-55°F 120-600VAC
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
- TypeLearning Thermostats
- 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.
Highlights
- 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
Specifications
| Brand | JOHNSON CONTROLS |
|---|---|
| Type | Learning Thermostats |
| Color | Gray |
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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