though the shaft should remain within standard tolerances for optimal performance

it usually indicates a significant airflow or combustion issue

This 24V normally closed valve features a high-torque actuator and a straight-through body design

it is best practice to install it with the solenoid vertical and upright to prevent debris from accumulating in the core tube

we recommend professional installation to ensure the gas combustion system is correctly sealed and calibrated

Resideo VU444A1155 Actuator Freon though the shaft should remainThe Resideo VU444A1155 is a heavy duty 120V fan coil actuator designed for high cycle commercial HVAC applications. This two position SPST actuator features a robust spring return mechanism, ensuring positive shut off in the event of power loss. Engineering specifications include a 15 second opening time and a rapid 6 second spring return timing over a 45 degree stroke. Built for durability in demanding mechanical rooms, the unit utilizes a nickel