Johnson Controls A70HA-1 Temperature Control 30067439-890 using a properly sized mixing

using a properly sized mixing tube for Maxitrol ensures the discharge air temperature remains within the specified deadband

Simplified Installation: Includes a #6 mounting kit and 4-way dial (1-10 scale) for fast field replacement

It is essential to verify the part number against your unit's original blower or burner housing documentation

Water saturates the carbon pores and destroys the adsorption properties

Always check the thermal spill switch and ensure the chimney is generating sufficient inches of water column (WC) draft during startup

Johnson Controls A70HA-1 Temperature Control 30067439-890 using a properly sized mixingThe Johnson Controls A70HA 1 is a commercial grade, low limit temperature control engineered for critical refrigeration and heating applications. Designed with a vapor pressure sensing element and a 20 foot capillary, this controller provides precise monitoring across a 15F to 55F range. As a manual reset temperature switch, it prevents automatic equipment restarts after a low temperature cutout, ensuring a technician can inspect the system before