Fenwal 35-725205-015 is a microprocessor-based direct spark ignition control designed for compatible 120 VAC gas-fired heating equipment using natural, LP, or manufactured gas.

The control manages ignition timing, gas valve operation, flame sensing, and safety lockout through a three-try ignition sequence with a 0-second pre-purge and 10-second trial for ignition.

It operates from 102 to 138 VAC at 50/60 Hz, supports a 1.5-amp gas valve load at 120 VAC, and provides a maximum flame-failure response time of 0.8 seconds. A minimum 1.0 microamp flame-sense current and line-frequency spark output support accurate flame verification and dependable burner startup.

Rated for -40°F to 175°F operation, the conformal-coated and potted construction helps protect the module in high-humidity environments. For compatible replacement applications, confirm the original voltage, wiring, gas type, ignition sequence, and flame-sensing requirements.

The Fenwal 35-725205-015 helps restore dependable burner ignition and flame monitoring.
 

Frequently Asked Questions
 

• What is the Fenwal 35-725205-015 used for?

The Fenwal 35-725205-015 controls direct spark ignition, gas valve operation, flame sensing, and safety lockout in compatible gas-fired heating equipment.

• What voltage does this ignition control require?

It operates from 102 to 138 VAC at 50/60 Hz and is designed for 120 VAC systems.

• What gas types are compatible?

This control is suitable for compatible equipment using natural gas, LP gas, or manufactured gas.

• What is the ignition sequence?

The module uses a three-try ignition sequence with a 0-second pre-purge and a 10-second trial for ignition.

• What gas valve load does it support?

The control supports a 120 VAC gas valve load up to 1.5 amps.

• What is the flame-failure response time?

The maximum flame-failure response time is 0.8 seconds.

• What flame-sense current is required?

The control requires a minimum flame-sense current of 1.0 microamp.

• What is the operating temperature range?

The Fenwal 35-725205-015 is rated for ambient temperatures from -40°F to 175°F.

• Is it suitable for high-humidity environments?

Yes. Its conformal-coated and potted construction helps protect the module in high-humidity operating conditions.

• Is the Fenwal 35-725205-015 a universal replacement?

No. Confirm the original voltage, wiring, gas type, ignition sequence, valve load, and flame-sensing requirements before ordering.

• Is professional installation recommended?

Yes. Installation and service should be completed by a qualified HVAC technician because the control operates gas-fired equipment and high-voltage ignition components.