GSI Outdoors PNEG-630 - Manual (Page 58)

Portable Dryer Troubleshooting
57
Fenwal Ignition System
Symptoms: Burner will not light, dryer
shutdown for "Loss of Flame"
Fenwal Ignition Operation
has to ignite and sense flame or it concludes
no flame is detected and begins a "Loss of
Flame" shutdown. If you have power on the in
put terminals and no voltage on the output ter-
minals, unload the secondary (take the wires off
of V1 and V2) and recheck for voltage. If no
voltage is present then suspect a bad Fenwal
board. If power returns, look for a bad so-
lenoid valve or a problem in the wiring.
Note: All of the above voltage checks can be
bypassed if you can hear one or more of the
solenoids on the gas train snap on after the 10
second purge delay. This is true because the so-
lenoids are connected across V1 and V2, and
for the solenoids to come on, power must be
going through the Fenwal board. Also during
the four(4) second ignition period the trans-
former is energized and you should be able to
observe sparking across the ignitor. If the sole-
noids snap, but no ignition takes place, check
for loose ignitor wires or check the ignitor con-
dition/ignition gap
(1/8 " to 3/16"). Remember
even if flame is sensed the sparking will discon-
tinue after the ignition period (4 seconds).
Continued on page 55.
• The Fenwal Ignition System ignites the
burner and monitors the flame. Once 120
VAC is applied to the Fenwal, the solenoids
are powered up and the transformer begins
ignition through the ignitor. If flame is
sensed during the ignition period (about
4 seconds), the transformer is turned off,
but the solenoids stay on. If no flame is det-
ected after the ignition period, both the solenoids
and transformer lose power and the dryer
begins a shutdown sequence.
• All voltage for the Fenwal Ignition
System is derived from the input/output
board of the Electronic Monitoring
Control System. For ignition to occur:
1. The fan must be turned on.
2. The pressure switch in the plenum
must indicate the fan is operating.
3. The burner switch must be in the
auto or manual position.
4. The dryer must go through a 10
second purge delay, which is indicated
on the LCD screen.
These steps must take place before troubleshooting
of the Fenwal System can occur. The following
assumes the above steps have been taken.
• The Fenwal Board located in the fan can
control box on the dryer has seven(7)
terminals. They are L1, L2, V1, V2, S1, S2
and E2. L1 and L2 are considered the input
to the board. After the 10 second purge delay,
an AC voltmeter connected Across L1 and
L2 should read 120 Volts AC. If this is true,
you can assume the input/output board is
operating properly and the problem is in the
ing
Fenwal Ignition System. If no voltage is
present after the 10 second purge delay,
check for voltage going through the auxil-
iary switch mounted on the side of the fan
contactor for that burner. This switch has
to close before the Fenwal gets power. If
this is OK, check the appropriate output
on the input/output board for that burner.
• If voltage is present across L1 and L2,
check for voltage across the Output of
the Fenwal board. The output terminals
are V1 and V2, and they will also have
120 VAC across them for approxi-
mately four(4) seconds. The four(4)
seconds is the amount of time the Fenwal
Troubleshooting Tips
Fenwal Ignition Operation
Fenwal Troubleshooting