🔥 35-605606-111 Fenwal 24V Direct Spark Ignition Control – 15 Second Prepurge
The Fenwal 35-605606-111 is a 24 VAC microprocessor-based Direct Spark Ignition (DSI) control designed for safe and reliable operation in a wide range of heating applications. With a 15-second prepurge and customizable ignition timing, this control ensures optimal burner performance and enhanced safety features for gas furnaces, boilers, water heaters, and commercial cooking equipment.
✅ Key Features
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✅ 24 VAC microprocessor-based DSI control for precision ignition
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✅ 15-second prepurge and 15-second interpurge for safe startup
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✅ Ignition timing: 4 seconds, Flame sense minimum 0.7 µA
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✅ Pressure switch monitoring and system diagnostic LED
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✅ Alarm output with normally closed contact for integration with safety systems
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✅ Automatic reset 1 hour after lockout
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✅ Customizable prepurge/interpurge timings
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✅ Multiple ignition attempts for reliable startup
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✅ Remote or local flame sensing
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✅ Flame sense test pins for maintenance and troubleshooting
📊 Specifications
| Specification | Detail |
|---|
| Manufacturer |
Fenwal |
| Model Number |
35-605606-111 |
| Control Type |
24V Direct Spark Ignition (DSI) |
| Input Voltage |
24 VAC, 50/60Hz, 300 mA |
| Valve Output |
24 VAC, 2A max |
| Pre-Purge |
15 seconds |
| Inter-Purge |
15 seconds |
| Ignition Time |
4 seconds |
| Flame Sense Min |
0.7 µA |
| Applications |
Gas furnaces, boilers, water heaters, commercial cooking equipment |
🔁 Compatible Applications / Use
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Gas furnaces
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Boilers (residential & commercial)
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Water heaters
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Commercial cooking appliances
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Other heating appliances requiring DSI control
⚠️ Common Symptoms / When to Replace
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Burner fails to ignite
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Frequent lockouts during startup
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Faulty or intermittent flame sensing
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System diagnostic LED indicates errors
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Pressure switch failures or improper prepurge/interpurge sequences
Replacing the Fenwal 35-605606-111 restores safe and reliable ignition and prevents repeated burner lockouts.
💬 Frequently Asked Questions (FAQ) ❓
Q: What is the prepurge and interpurge timing?
A: Prepurge and interpurge are set at 15 seconds each to ensure safe gas clearance before ignition.
Q: Can this be used on commercial boilers?
A: Yes — it is compatible with residential and commercial gas furnaces, boilers, and water heaters.
Q: What does the flame sense test do?
A: The test pins allow maintenance personnel to check flame current and ensure proper flame detection.
Q: How many ignition attempts does the control allow?
A: The control allows multiple tries to safely ignite the burner before a lockout occurs.
🛒 Shopping Tips
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Verify the voltage and amperage requirements (24 VAC input, 2A valve output)
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Check that the control is compatible with your appliance type
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Ensure proper installation of pressure switch and flame sensor
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Keep a spare DSI control for critical commercial applications
