this unit offers high-capacity switching for motor loads up to 1 HP at 250VAC

making it suitable for large commercial boiler banks

Verify there is no direct short to ground in the 24V circuit

What is the difference between the 22-133 and the MCS-G

the Bard HVAC 5152-090BX blower wheel is a direct replacement for the 5152-090

Venstar VST4800 Tstat 30067439-890 this unit offers high-capacity switchingThe Venstar VST4800 Explorer is the high performance multi stage programmable thermostat designed specifically for professional contractors managing commercial HVAC systems. Engineered to be the direct replacement for P374 2200, P374 2800, VST2800, and T2800 models, this unit provides seamless 3H 2C compatibility for gas electric and heat pump installations. As a technical professional, you will appreciate its non volatile memory and Dry Contact