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the physical orientation must match the original mounting holes to ensure the sensing element stays in the correct airflow path
This negative pressure switch provides the critical safety feedback required to authorize the ignition sequence
This pneumatic room thermostat typically operates on a 20 psig nominal supply
High-Pressure Reliability: Rated for high-pressure water systems
Fenwal 35-605601-201 Control R-410A the physical orientation must matchThe Fenwal 35 605601 201 is a high performance 24V Direct Spark Ignition (DSI) control module engineered for precise burner sequencing in gas fired heating systems. This microprocessor based unit utilizes standard 24 VAC input and features a fixed 30 second pre purge period followed by a 4 second trial for ignition (TFI) to ensure safe and efficient combustion. Designed for reliability in the field, it includes on board LED diagnostics for rapid
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