This model uses a 3/4 inch NPT (National Pipe Thread) fitting

Engineered as a high-precision damper linkage accessory

the contacts should be open

OEM arms like the ARM0156 are specifically stress-tested for the motor weight and RPM of your specific system

For 1" 800M4 assemblies

York S1-024-19082-740 Sequencer Relay Els PW 17895 This model uses a 3/4The York S1 024 19082 740 Sequencer Relay is a heavy duty, field proven 24V heat sequencer relay designed to manage stage activation in electric furnaces and air handlers. Utilizing a solid state positive temperature coefficient (PTC) heater and bimetallic discs, this control ensures precise, staggered firing of heating elements to prevent high inrush currents and potential circuit breaker trips. It functions by converting a low voltage signal from