How do I know if I need a solid center or open center spider

Identical to the Danfoss 068U209700

Thermal Safety: Features a fixed 175

Is the 90293 compatible with DC control circuits

Fenwal 35-605506-227 Control Freon How do I know ifThe Fenwal 35 605506 227 is a microprocessor based 24V Direct Spark Ignition (DSI) control engineered for precision timing and reliable flame supervision in gas fired atmospheric and power vented heating systems. This veteran grade module features a 30 second pre purge cycle to clear the combustion chamber of residual gases prior to ignition, ensuring a safe start up sequence every time. Designed with a 15 second Trial for Ignition (TFI) and a 3 try