1/4”
3/16”
3/16”
3/16”
1/4”
3/16”
1/4”
Alarm
Valve Power
120 VAC (Neutral)
Valve Neutral
120 VAC Input (Hot)
Burner Ground
Remote Flame Sensor
Flame Sense Test Pins
NC
V1
L2
V2
L1
B. GND
S1
*
FC+, FC-
11
10
8
7
6
2
1
Lt. Blue
Brown
White
Yellow
Black
Purple
Gray
MOUNTING AND WIRING
The 35-70 is not position sensitive and can be mounted vertically or
horizontally. The control may be mounted on any surface and fastened
with #6 sheet metal screws. Secure the control in an area that will
experience a minimum of vibration and remain below the maximum
ambient temperature of 80°C (175°F).
All connections should be made with UL approved, 105°C rated, 18
gauge, stranded, .054” thick insulated wire. Refer to the appropriate
wiring diagram when connecting the 35-70 to other components in the
system. High voltage spark cables and control wiring harnesses are
detailed on Pages 5 and 6.
SYMPTOM
Control will not start up
Gas Valve on and no spark
through TFI
Spark on and gas valve off
Flame during trial
for ignition but
no flame sense after
trial for ignition
I
nput Power
Input Current Drain
Gas Valve Rating
Operating Temperature
Flame Sense Voltage
Flame Sense Current
Flame Failure Response Time
Types of Gas
Spark Rate
Moisture Resistance
Size (LxWxH)
Weight
102 to 138 VAC, 50/60 Hz
350mA @ 120 VAC, 60 Hz
1.5A @ 120 VAC
-40°F to +175°F, -40°C to +80°C
120 VAC
1.0 microamp minimum
0.8 seconds maximum
Natural, LP and manufactured
Line frequency (50/60 Hz)
Conformal coated to operate to 95% R.H.
See drawings on Page 8
Integral stand-offs: 7.1 oz Potted:14.3 oz
Case and Cover: 10.1oz
RECOMMENDED ACTIONS
A. Check wiring
B. No voltage @ L1, check thermostat
C. Check fuse/circuit breaker
D. Faulty transformer on control
E. Faulty control, consult Fenwal
A. Shorted electrode - re-establish 1/8” gap
B. High voltage cable is disconnected
C. Check wiring
A. Valve coil open
B. Valve wire disconnected
C. Faulty control, check voltage @ V1
A. Check electrode position
B. Check high voltage wire and connection
C. Poor ground @ burner
D. Check flame current
E. Check flame current on control
SINGLE SPARK AND SENSE
REMOTE SENSE
TERMINAL
DESCRIPTION
MULTI-PIN
CONNECTOR
P/N: AMP 1-644615-1
QUICK
CONNECT
TERMINAL
SIZE
SPECIFICATIONS
TROUBLESHOOTING GUIDE
Terminal Designations
WARNING:
Operation outside specifications could result in failure of
the Fenwal product and other equipment with injury or death to people
and damage to property
.
PIN
LOCATION
WIRE
COLOR
CAUTION:
Label all wires prior to disconnection when servicing the control.
Wiring errors can cause improper and dangerous operation. A functional
checkout of a replacement is recommended.
LED Indication
Steady on
2 Flashes
3 Flashes
Fault Mode
Internal Control Failure
Flame Fault
**
Ignition Lockout Fault
The LED will flash on for 0.2 seconds then off for 0.2 seconds to indicate
an error condition. The pause time between error codes will be 2.5 to 3.0
seconds. During power-up, the LED will light for one second and then turn
off to indicate normal operation.
ON-BOARD DIAGNOSTICS
2 Pin Header
(AMP P/N: 640383-2, Molex P/N: 26-60-2020)
PIN LAYOUT
*
On controls configured for single spark and sense with quick connects, the
S1 terminal is removed. On controls configured for single spark and sense with
multi-pin connector, leave S1 wire, pin 1, color gray unconnected.
Series 35-70, 120 VAC Direct Spark Ignition Control
Page 3
www.fenwalcontrols.com
1-800-FENWAL-1
**
May indicate either that a flame was detected during pre- or post-purge,
or that there is a flame sensing error.
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