Fenwal Controls Series 35-703 Manual Download Page 1

F-35-703

March 2020

1

FEATURES

Safe start with DETECT-A-FLAME

®

 flame sensing 

technology

Custom pre-purge and inter-purge timings

Single or three trials for ignition

System diagnostic LED

Local or remote flame sensing

Automatic reset

Open board, potted or enclosure

APPLICATIONS

Commercial cooking

Gas furnaces

Unit heaters

Water heaters

Other gas-fired appliances

DESCRIPTION

The 35-703 is a 120 VAC intermittent pilot (IP) control designed 
for use in all types of gas-fired appliances. The control uses a 
microprocessor circuit to provide precise, repeatable timing and 
operating sequences. On-board diagnostics with LED output 
makes troubleshooting easy and ensures safe and efficient 
operation.

Export Information (USA)

Jurisdiction: EAR
ECCN: EAR99

Agency Certifications

SPECIFICATIONS

Recognized under the UL component program, UL 
372. Software certified to ANSI/UL 1998. UL File 
MH8817

Design Certified to ANSI Z21.20,
CAN/CSA C22.2 No. 199-M89

Input Power

102 to 138 VAC, 50/60 Hz

Input Current

350 mA @120 VAC with main and 
pilot gas valve relays energized 
(control only)

Main Gas Valve

1.5A max @ 120 VAC

Pilot Gas Valve

1.5A max @ 120 VAC

Operating Temperature

-40°F to +160°F
(-40°C to +71°C)

Storage Temperature

-40°F to +185°F
(-40°C to +85°C)

Flame Sensitivity

1.0 

µ

A minimum

Flame Failure Response

0.8 seconds maximum

Flame Detector Self-check 
Rate

Once per second minimum

Gas Types

Natural, LP, or manufactured

Spark Rate:

Remote
Local

50/60 sparks/sec
25/30 sparks/sec

Size (LxWxH)
with enclosure

5.11 x 3.55 x 2.00 inches
(12.98 x 9.02 x 5.08 cm)

Moisture Resistance

Conformal coated to operate non-
condensing to 95% R.H. Module 
should not be exposed to water

Ingress Protection

Not rated, protection provided by 
appliance in which it is installed

Tries for Ignition

One or three try versions available

Trial for Ignition Periods

15, 30, 60, 90 seconds available

Pre-purge and Inter-purge 
Timings

0, 15, 30, 45 seconds or 4 minutes 
available

SERIES 35-703

120 VAC Microprocessor-Based 

Intermittent Pilot Ignition Control

R

Summary of Contents for Series 35-703

Page 1: ... to ANSI Z21 20 CAN CSA C22 2 No 199 M89 Input Power 102 to 138 VAC 50 60 Hz Input Current 350 mA 120 VAC with main and pilot gas valve relays energized control only Main Gas Valve 1 5A max 120 VAC Pilot Gas Valve 1 5A max 120 VAC Operating Temperature 40 F to 160 F 40 C to 71 C Storage Temperature 40 F to 185 F 40 C to 85 C Flame Sensitivity 1 0 µA minimum Flame Failure Response 0 8 seconds maxim...

Page 2: ...and entering lockout If the pilot burner relights normal operation resumes FLAME FAILURE RECYCLE MODE With the Recycle After Loss of Flame option upon loss of flame the pilot and main gas valves are de energized and the control proceeds to inter purge before attempting to relight the flame Multi try models permit three tries for ignition including inter purges If the pilot burner relights normal o...

Page 3: ...HOOTING Note During a fault condition the LED will flash on for 1 4 second and off for 1 4 second as needed to indicate the fault code The code will repeat every 3 seconds Removing power from the control will clear the fault code L2 SPARK BURNER BURNER GROUND H V OUT 120V THERMOSTAT OR CONTROL DEVICE L1 PV MV L2 L2 V2 L1 B GND PV1 MV1 L1 L2 120V THERMOSTAT OR CONTROL DEVICE PV MV L2 L2 V2 L1 B GND...

Page 4: ...the meter A jumper wire must be installed across the terminals of the meter Once the flame is established and sparking terminates remove the jumper wire to measure flame current The flame sense current must be 0 7 uA minimum for proper operation REMOTE FLAME SENSE With power off remove sense wire from S1 terminal and install a DC microamp meter between the S1 terminal and sense wire Establish flam...

Page 5: ...rge 0 None Single Try Only 1 15 Seconds 2 30 Seconds 3 45 seconds 4 4 minutes Pre Purge 0 None 1 15 Seconds 2 30 Seconds 3 45 Seconds 4 4 minutes Tries for Ignition Flame Sense Method and Reset Method 0 1 try local sense 1 1 try remote sense 2 1 try local sense 3 1 try remote sense 5 3 try local sense 6 3 try remote sense 7 3 try local sense 8 3 try remote sense Configuration and Wiring Options 5 ...

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