mount the unit on the return air duct at least 12 inches upstream of the humidifier bypass or any internal heat sources to ensure it samples true ambient air

Reduced Standby Loss: Closes the vent when the system is idle

the 35-65 series features field-selectable line voltage

Utilizing a direct coupled actuator

and fluids up to 300 SSU viscosity

Siemens Building Technology 331-4810 Actuator 320735-701 mount the unit on theThe 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