FENWAL IGNITION CONTROLS

Fenwal direct spark ignition (DSI) controls generate a high-voltage spark at the burner to ignite gas directly, while intermittent pilot (IP) controls ignite a standing pilot flame that then lights the main burner. DSI is common in equipment where the burner is easily accessible for spark ignition, such as rooftop units and some boilers. IP controls are often used in furnaces and appliances where a pilot flame provides a stable ignition source. Both types monitor flame presence through a flame sensor and shut off gas if flame is not proven. The choice depends on the original equipment design and the ignition sequence specified by the manufacturer.

To cross-reference a Fenwal ignition control, start with the manufacturer part number printed on the original control, such as 35-755900-009. Compare the operating voltage (24 VAC, 24 VDC, or 120 V), ignition type (DSI, IP, or HSI), and flame-sensing method. Check the connector layout and mounting dimensions to ensure physical compatibility. The SKU 40LX33 corresponds to part number 35-755900-009 and is listed as a replacement HVACR control. If the original part number is not visible, consult the equipment manual or contact 3G Electric with the appliance model and serial number for assistance. Always verify that the replacement control matches the original specifications before installation.

The Fenwal ignition control boards in 3G Electric's catalog include models operating at 24 VAC, 24 VDC, and 120 V. For example, SKU 40LX22 operates at 24 V, SKU 40LX17 operates at 24 VDC, and SKU 40LX31 operates at 120 V. The voltage must match the original control's specification and the equipment's power supply. Using a control with the wrong voltage can damage the control or the equipment. Always confirm the voltage requirement from the original part number or equipment documentation before ordering. 3G Electric lists the operating voltage for each SKU to help buyers select the correct replacement.

Yes, Fenwal ignition controls are used in a range of gas-fired equipment, including commercial ovens, boilers, furnaces, and rooftop units. For example, SKU 40LX31 is specified for use in furnaces, boilers, and commercial ovens. SKU 40LX19 is used in commercial and industrial furnaces, boilers, and rooftop units. The suitability for a specific application depends on the control's ignition type, voltage, and sequence timing. When replacing a control in a commercial oven or boiler, verify that the replacement matches the original specifications and that it is approved for the application. 3G Electric supplies these controls as replacement parts for maintenance and repair.

Fenwal ignition control boards typically include flame sensing to confirm that ignition has occurred, and safety interlocks to monitor conditions such as airflow or gas pressure. If flame is not detected within a set trial-for-ignition period, the control shuts off the gas valve and may lock out until reset. Some models also include a pre-purge and post-purge sequence to clear residual gas. These features help prevent unsafe gas accumulation. The specific safety features vary by model, so refer to the product documentation for details. 3G Electric provides basic specifications for each SKU, but the full sequence of operation should be verified against the original equipment requirements.

3G Electric provides logistics support and order fulfillment for Fenwal ignition controls. The catalog lists manufacturer part numbers and basic specifications to help buyers identify the correct replacement. For cross-referencing assistance, buyers can provide the original part number or equipment details. 3G Electric does not manufacture these products and does not provide installation or troubleshooting services. For technical support on installation and operation, consult the equipment manufacturer or a qualified technician. 3G Electric's role is to supply genuine replacement parts and ensure they are delivered as ordered.