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Technicians should measure the DC microamp signal in series with the flame sensor
critical for modern high-pressure refrigerants
While the 3/8" x 5" copper bulb can be used for air sensing
while the integrated check valve functionality (model dependent) simplifies piping layouts
Fenwal 35-655921-001 Ignition Module 320788-703 Technicians should measure the DCThe Fenwal 35 655921 001 is a microprocessor based 24 VAC Hot Surface Ignition (HSI) Control engineered for precise management of gas fired appliances. This direct replacement ignition module handles the complete demand sequence, including combustion blower control, flame sensing, and diagnostic monitoring. Designed for systems under 400K BTU, it features a 5 second Trial for Ignition (TFI) and a 5 second ignitor heat up period to ensure stable
