Resideo ZD16X18TZ Damper R-448A Integrated Fan Control: Provides the

Integrated Fan Control: Provides the necessary delay for the blower motor to ensure warm air delivery upon startup

the 90-118E provides the reliable switching performance that contractors expect from White-Rodgers components

The Lochinvar 100277781 Control (Model FB751-1251) is an integrated control board engineered specifically for Crest Heating Boilers

The integrated NTC thermistor sensor provides accurate temperature monitoring up to 160 degrees

Technicians typically look for signs of a "hunting" valve

Resideo ZD16X18TZ Damper R-448A Integrated Fan Control: Provides theThe Resideo ZD16X18TZ is a robust 16" Wide X 18" High parallel blade zone damper engineered for precision airflow control in residential and light commercial HVAC zoning applications. Built with a high grade extruded aluminum frame and blades, this unit is designed for long term durability and low leakage performance. The synchronous motor is a 24Vac power closed spring return open actuator, ensuring a fail safe normally open position during power