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MAINTENANCE
6.3.4.2 Ignition Control Board.
(See Figure
7·3.) To remove ignition
control board (5),
first disconnect wires at electrode (30), reset
switch (20), gas valve (42), pressure switch
assembly (17) and terminal strip (27). Remove
screws
(1) nuts
(2) lockwashers
(3) and
spacers
(4)
and remove control board
(5).
NOTE
Ignition control board components are
not replaceable.
A damaged
board
must
be
replaced
with
a
new
assembly.
6.4 ADJUSTMENTS AND OPERATIONAL
CHECKS
During
normal
use or when parts are
replaced certain adjustments
must be made.
Components requiring adjustments or opera-
tional checks are outlined
in the following
paragraphs.
6.4.1 Gas Burners and Pressure Regulator
The burners and fixed orifices are sized
at the factory for natural gas operation. The
burner air shutters should be adjusted at the
proper opening
to produce
a blue flame
without yellow tipping. To adjust air shutters
see Figure 6-5. Special size orifices are re-
quired for the gas burners. Refer to Figure 7-3
indexes 43, 44 and 45 for correct orifices to
be used with certain gases.
~---GAS
BURNERS
~SHUTTERS
BURNER
CHASSI~
TYPE OF
GAS
DIM A
NATURAL
&
MANF'D.
5.132"
PROPANE &
BUTANE
7/32"
Figure 6-5. Air Shutter Adjustment
6-5
In
addition,
regulator (39) must be set to pro-
per setting
of4,0"
W.C.
for
natural
and
manufactured
gas and 10"
w.e.
for propane
and butane gases. (Regulator
is set at 4"
W.C.
pressure at the factory and must be
changed to 10" W.C. pressure as required.)
Regulator
is adjusted
by removing slotted
cap and positioning
marked spring guide as
shown in Figure
6-6.
~.-.S(Alll\f>
0---
lOP
v"w--@
=tl=~
NAIUqAl
GAS,
POSITION
ll'
GAS
POSITrON
Figure 6-6. Gas Regulator Adjustment
6.4.2 Electrode Assembly
Electrode
assemblies
(Figure 7-3 index
30) are preset to a gap spacing of 0,125 inch
±
0.032
inch
and
should
be
checked
periodically.
If spacing is not correct adjust-
ment
is not to be made, The complete
assembly must be replaced with a new unit.
Electrodes are not field adjustable.
6.4.3 Solenoid Gas Valve
The solenoid gas valve (Figure 7-3 index
42) is used to control the flow of gas to the
main burner which is under control of the
pressure switch.
To check valve operation
proceed as follows:
1. Make certain the power disconnect for
the unit is on,
2.
Turn on gas supply and turn timer
knob to 15 minutes. Electrodes will be
energized.
3. Turn timer to
zero.
Listen carefully for
the slight sound indicating
the valve
has
closed.
4. If bu rner flame has not gone out, cycle
the valve several
times.
The cycling
should jar loose any dirt or impurities
that may settle on the valve seat.
5. After check ..is made return timer to
OFF and shut off gas supply.
6.4.4 Timer and Gas Control Switches
The timer control
switch
automatically
delays the timer count-down at the beginning
of the cooking cycle until the Steam-It
has
fully vented out all cold air from inside the
cooking
compartment
and
pressure
has
52127
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