MARS 50319 Transformer 320735-701 Techs should verify the actuator

Techs should verify the actuator assembly alignment and ensure all electrical connections are wired in series with existing operating limits

Key Benefits Precise Compatibility: Engineered as a drop-in replacement for Barber Colman AT-11-399 and AT-24-399

This 0–30 PSI gauge typically features a standard NPT bottom connection designed to thread directly into the boiler's siphon or mounting pipe

Setting it too close to the freezing mark (32°F) may not provide enough lead time to stop the fan before ice forms in the copper headers

MARS 50319 Transformer 320735-701 Techs should verify the actuatorThe MARS 50319 Transformer is a heavy duty, multi tap HVAC control transformer engineered for versatile voltage step down in commercial and residential climate systems. As a 50VA NEMA Class II power source, this unit provides the necessary 24VAC output to drive thermostats, contactors, and integrated circuit boards. The primary side supports 120 208 240 480V inputs, making it a "truck stock" essential that can replace a wide range of OEM or Honeywell