FEATURES
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3 Enclosure Configurations
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Case and Cover - dust and foreign object protection
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Open Board with Stand-offs - saves space and cost
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Potted - protection for washdown and exteme vibration
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Full-time power option
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Integral Blower Relay
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2 Wiring Options – 1/4” quick connects and multi-pin connector
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2 Trial For Ignition Options - 1 and 3 trial
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4 Trial For Ignition Times - 4, 7, 10 and 15 seconds
(customized timings available)
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2 Flame Sense Options – single spark and sense
and remote sense
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Diagnostic LED - 3 error codes for accurate troubleshooting
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Flame Current Test Pins - instant access to circuit
for troubleshooting
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Polarity Insensitive – reduces chance of miswiring
APPLICATIONS
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Construction and Agriculture Heaters
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Crop Dryers
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Ceramic and Black Body Infrared Heaters
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Commercial Cooking Equipment
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Any 120 VAC Gas Burner Application under 400K BTU
DESCRIPTION
The 35-71 is a 120 VAC direct spark ignition control with
blower relay for controlling a gas valve, controlling and
monitoring combustion air-flow and igniting LP or natural gas
for construction heaters, infrared heaters, crop dryers,
commercial cooking equipment and gas burner applications
that provide a 120 VAC operating signal.
The microprocessor circuit design provides precise, repeatable
timing sequences for ignition times and purge times (pre-,
inter- and post-) as well as multiple tries for ignition, 1 hour
automatic reset and flame sensing during pre-, inter- and post-
purge. The control continually monitors the pressure switch,
thermostat and main burner flame to ensure safe system
operation. The on-board diagnostics with LED output provide
assistance with troubleshooting to ensure safe and efficient
burner operation.
Agency Certifications
Recognized under the Component Program of Underwriters Laboratories
Inc., UL 372, UL 1998 Software
Design certified by CSA International, CAN C22.2 #199-M89
and ANSI Z21.20 Automatic Ignition Systems
SERIES 35-71
120 VAC Direct Spark Ignition Control with
Combustion Blower Relay - Microprocessor Based
THE TOTAL SOLUTION FOR
GAS IGNITION CONTROL
Fenwal offers a complete range of ignition
control products including:
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Ignition Controls
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Spark and Flame Sense Electrodes
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Spark and Flame Sense Cables
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Wiring harnesses
Designed, developed and
manufactured by Fenwal,
these components integrate
seamlessly providing
maximum system performance.
Getting Started - Samples
To ensure proper system design and operation, Fenwal provides
sample ignition controls, high-voltage wires and electrodes for trial
and evaluation at no charge. To get you started quickly, Fenwal has
identified our most popular ignition controls, see Page 8. Whether
it is an individual control, complete start-up kit or customized control,
Fenwal is ready to provide your gas ignition solution.
Fenwal Ignition Development Center
Send your equipment to us and we’ll design, install and qualify a
control to meet your exact application requirements. Fully equipped
and staffed with trained technicians, the Fenwal Ignition Development
Center has proven extremely beneficial for many customers focused
on product quality and reducing time-to-market for their appliances.
35-71-01
Series 35-71, 120 VAC Direct Spark Ignition Control
Page 1
www.fenwalcontrols.com
1-800-FENWAL-1
