McDonnell & Miller 194-7B Controller R-410A technicians should verify the alarm

technicians should verify the alarm set points via the controller's technician mode to ensure the logic matches the specific ambient and load requirements of the site

preventing signal drift and ensuring the system responds correctly to setpoint changes

these should be utilized to purge air from the sensing chambers to ensure accurate differential pressure readings

Using non-compatible actuators may result in improper seating or failure to close under pressure

McDonnell & Miller 194-7B Controller R-410A technicians should verify the alarmThe McDonnell & Miller 194 7B (Part Number 167200) is a rugged, industrial grade Combination Low Water Cut Off and Pump Controller designed for high pressure steam applications. Built to manage steam boilers with a maximum pressure of 250 psi, this unit utilizes No. 7B proportional control via a built in potentiometer switch. This configuration is essential for modulating feed valves, ensuring precise water level maintenance and preventing dry fire