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LOCAL SENSE
Figure 1
/w
REMOTE SENSE
Figure 2
/w
Proper Electrode Location
Proper location of the electrode assembly is important for optimum
system performance. It is recommended that electrode assembly
be mounted temporarily using clamps or other suitable means
so that the system can be checked before permanently mounting
the assembly. The electrode assembly should be located so that
the tips are inside the flame envelope and about 1/2 inch (1 cm)
above the base of the flame. See Figure 3 below.
Figure 3
CAUTIONS:
1. Ceramic insulators should not be in or close to the flame.
2. Electrode assemblies should not be adjusted or disassembled.
Electrodes should have a gap spacing of 0.125± 0.031 in
(3.12± 0.81 mm), unless otherwise specified by the appliance
manufacturer. If this spacing is not correct, the assembly must be
replaced. Electrodes are NOT field adjustable.
3. Exceeding the temperature limits can cause nuisance lockouts
and premature electrode failure.
4. Electrodes must be placed where they could not be exposed
to the appliance user in normal operation.
www.fenwalcontrols.com
1-800-FENWAL-1
TABLE 3 - TROUBLESHOOTING GUIDE
SYMPTOM
RECOMMENDED
ACTIONS
1. Control does not start
A. Miswired
B. 24 VAC Transformer bad
C. Fuse/Circuit breaker bad
D. Bad control, check
2. Thermostat on - no spark A. Miswired
B. Bad thermostat, no voltage
C. Bad control, check LED
3. Valve on - no spark
A. Shorted electrode - establish
during TFI
B. Check high voltage cable
C. Miswired
4. Spark on - valve off
A. Valve coil open
B. Valve wire disconnected
C. Bad control, check voltage at
5. Flame okay during TFI -
A. Check electrode position
no flame sense after TFI
B. Check high voltage wire
C. Poor ground at burner
D. Poor flame, check flame current
Flame Sensor Current Check
Flame current is the current that passes through the flame
from the sensor to ground. The minimum flame current
necessary to keep the system from lockout is 0.7 micro
amps. To measure flame current, connect analog DC micro-
ammeter to the FC-, FC+ terminals per figure. Meter should
read 0.7 microamps or higher. If the meter reads below "0"
on scale, meter leads are reversed. Disconnect power and
reconnect meter leads for proper polarity.
Figure 4
Series 35-63, 24 VAC Intermittent Pilot Ignition Control
LED for steady on or
flashing code (see Table 1)
at thermostat terminal W
for steady on or flashing codes
1/8th inch gap
gas valve terminals PV1 or MV1
and V2
Page 3
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