Johnson Controls A19ABA-40 SPST Temperature Control Close On Rise 6' -30°F-100°F

The Johnson Controls A19ABA-40 is a remote bulb temperature control switch applied to heating and cooling equipment based on the temperature. It has a single stage operation and a temperature differential of 6°F. This means, it will switch on the heating system whenever the temperature is 6 degrees lower than the set point and switch off the heating system whenever the temperature is 6 degrees higher than the set point. This kind of remote bulb switch is commonly applied to HVAC systems such as furnace, air conditioner, and heat pump. It is used in a standard incandescent light fixture located close to the thermostat but not directly in front of a vent to measure temperature accurately.