Siemens Building Technology 331-4810 Actuator R-448A This externally equalized valve

This externally equalized valve

many Lennox systems utilize a crankcase thermostat (S40) to cycle the heater based on ambient or liquid line temperatures for energy efficiency

the York S1-025-43289-000 is an automatic reset switch

OEM Compatibility: Exact drop-in replacement for York 492-16939-005

and 3/4" internal diameter (I

Siemens Building Technology 331-4810 Actuator R-448A This externally equalized valveThe Siemens 331 4810 is a rugged, metal fabricated No. 3 Pneumatic Actuator engineered for reliable modulating or two position control of HVAC dampers and terminal units. Built with all metal construction and a totally enclosed housing, this 331 Series actuator is a staple for contractors maintaining mixing box dampers, unit ventilators, and air valves. It features a 2 3 8 inch stroke and a nominal 8 13 psi spring range, allowing for precise