and KD Series

an unbalanced blower wheel

Key Benefits for Technicians Enhanced System Reliability: Actively monitors parameters to prevent motor burnout and extended downtime

Self-Powered Operation: Internal solar cells eliminate battery failures and complex wiring in remote tank or pipe locations

When the thermocouple voltage drops due to pilot outage

Fenwal 35-705501-003 Control R-410A and KD SeriesThe Fenwal 35 705501 003 is a dedicated 120VAC Direct Spark Ignition (DSI) control designed for precise gas burner management in commercial and industrial HVACR applications. This microprocessor based ignition module features a 7 second Trial for Ignition (TFI) period and is engineered for single try configurations. As a non prepurge (NoPP) unit, it initiates the spark sequence immediately upon the call for heat, making it an essential component for