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It is recommended to replace the gasket during every inducer service to prevent flue gas leakage
it should be installed in a vertical or horizontal run of the liquid line
meaning it breaks the circuit as temperature rises above the setpoint
and HE series heaters
Schneider Electric (Barber Colman) MK4-3121 Actuator 321142-301 It is recommended to replaceThe 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
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