the switch opens the control circuit to prevent thermal overloading

Auxiliary Signaling: Includes 1 NO + 1 NC contacts for local trip signaling and integration into control circuits

While the valve is compatible with both fuel types

UDAS units utilize a separated combustion design that requires different pressure switch settings and orifice configurations

they must be purchased separately or as part of a seat kit

Schneider Electric (Barber Colman) MK4-3121 Actuator 340793-762 the switch opens the controlThe Schneider Electric MK4 3121 is a commercial grade pneumatic damper actuator engineered for precise proportional control in complex HVACR systems. Designed as a direct successor in the Barber Colman lineage, this unit features a rugged die cast aluminum housing and a high performance beaded molded neoprene diaphragm for maximum durability. It operates within an 8 to 13 psi spring range and includes a factory installed positive positioner