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5-6
(solenoid
valve,
RESET
switch,
electrode,
etc.) are not damaged
and the interconnec-
ting wiring is complete and not damaged, the
trouble
is due to a malfunction
of the corn-
ponents on the ignition
control board. Corn-
ponents
on
the
control
board
are
not
replaceable
and a damaged
control
board
must be replaced with a functional
unit. The
following
paragraphs
outline
possible
pro-
blems
and
symptoms
that
may
be en-
countered
during
the
normal
use of the
Stearn-lt.
CAUTION
If a control
board is replaced, be sure
that the high voltage lead of the etec-
trode is connected
to terminal E1 and
the low voltage
lead is connected
to
terminal E2 of the control
board.
5.4.3.1 Improper Polarity. If a spark is present
and the gas valve opens,
but the system
shuts down after the trial
period,
check the
120 volt ac input voltage at terminals
A (L 1),
and L2 of the control board, for proper polari-
ty. Terminal
A should be the hot side of the
line and L2 neutral.
5.4.3.2 Damaged Grounding. If a spark is pre-
sent and gas valve opens, but the system
shuts down after the trial period, check to
make sure the system is properly grounded
to the burner and that the burner is properly
grounded.
Proper grounding
is essential
for
the
proof
of flame
safety
device.
If the
system is not grounded to the burner, it can·
not determine
the presence of flame and will
lock out. A restart will initiate the trial for ig·
nition period, but the system will continue to
go into "lock out" if it is not properly ground·
ed,
and the thermal reset timer will trip. Wait
one minute before pushing the RESET button
in.
Check all power and ground terminals
to
make sure good contact
is made. Clean any
corrosion
that might interfere with good elec·
trical contact.
5.4.3.3 Malfunction Due to High Voltage.
During the trial for ignition, if the spark is in-
termittent
and the valve may (or may not)
open, check the spark gap on the electrodes
and system wiring as follows:
1.
Remove the electrode from burner and
check to see that the gap is 1/8 inch
±
1/32 inch. If it is
not,
replace elec·
trode.
2.
Visually
check
the ceramic
housing
and lead wires for cracks or breaks.
52127
ST·AG STEAM·IT COOKER
3. Check
terminals
E1
and
E2
for
inadvertent
grounding.
They should be
no closer than 1/2 inch from metal ob-
jects,
which
can
cause
arcing
to
ground.
If
the electrode
or electrode
lead wires are faulty, replace with new
electrode and wiring.
5.4.3.4 Malfunction of Gas Valve. If the board
is receiving proper power and there is a spark
during
the trial for ignition
period,
but the
valve will not open, check the valve for an
open
coil
or other
malfunction.
Be sure
voltage rating of the valve is 120 volts
ac.
Use
a voltage tester or volt-meter
at terminals
B
and V2 of the ignition
control
board. The
voltage shou Id be the same as the valve.
5.4.3.5
Erratic
Operation.
If the
system
operates
properly
for a while but randomly
shuts down during
the duty cycle, or won't
operate during
"cold"
starts,
check the flame
proving
circuit
with a dc microamp
meter.
Refer to Figure 5-3 and proceed as follows:
1. Locate ignition
control
board, Figure
7·3, Item
5.
2. Remove
low
voltage
wire
from
terminal
E2 and connect
one lead of
microamp
meter to push-on connector
attached to lead
wire.
3.
Connect
second
lead
of
meter
to
terminal E2 on ignition control
board.
4.
Energize
control
board
and
read
current
on microamp
meter. Typical
flame current is 2 to 20
microamperes.
=
o
TO
SO
MICROAMP
METER'
51
ELECT
RODE
Figure
5-3.
Placement
of Flame Current
Meter
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