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the 21D28-6 is the designated direct replacement
The unit includes the integrated thermopile generator
ensuring a precise match for system geometry and electrical specifications
the blower motor running continuously while the burners stay off
Does this require a flare gasket
Fenwal 35-615516-111 Module 320720-756 the 21D28-6 is the designatedThe Fenwal 35 615516 111 is a high performance 24 VAC microprocessor based direct spark ignition (DSI) control module optimized for precision burner management in gas fired heating systems. This veteran grade HVAC ignition control is engineered with an integrated inducer blower relay, simplifying the wiring stack while ensuring robust control over the combustion process. Specifically designed for applications requiring a 15 second pre purge and inter
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