MONTAGUE Legend 12, Instruction Manual

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CAUTION
THE RECALIBRATION SHOULD NOT BE
MADE UNTIL THE BYPASS (MINIMUM
BURNER) FLAME HAS BEEN PROPERLY
ADJUSTED.
ADJUSTMENT OF BYPASS (MINIMUM
BURNER FLAME) - 136 SERIES
Enough gas must be bypassed through the heat
control to keep the entire burner lit while in use.
The control regulates the flame from high to low.
1. Bypass Adjustor
2. Screw Clearance
3. Calibration Screws
4. Calibration Plate
5. Dial Stop
PROCEDURE:
1. Turn dial to 300 degrees F.
2. Light main burner.
3. After oven temperature rises and remains
constant, turn dial back to low. This closes
main valve and permits only the bypass gas
to the burner.
4. Remove dial.
5. With a screwdriver, turn the bypass flame
adjustor screw counterclockwise to increase
the bypass flame or clockwise to decrease it
until the flame over the entire burner is
approximately 1/8‖ high. Replace dial.
1
2
3
4 5
Figure 14. Oven Thermostat Components
THERMOSTAT CALIBRATION CHECK
136 SERIES
1. Place the thermocouple of test instrument or
thermometer in the middle of the oven.
2. Light the mail burner.
3. Turn dial so 350 lines up with the indicator
mark on dial stop.
4. Allow the oven to heat until flame cuts down
to bypass. After sufficient time, check
temperature. If the temperature does not
read within 15 degrees of the dial setting,
recalibrate as follows:
A.) Pull dial straight off without turning.
B.) Hold calibration plate and loosen the two
calibration lock screws until the plate can
be moved independently of the control.
C.) Turn calibration plate so that the
instrument or thermometer reading is in
line with the indicator mark. Hold plate
and tighten screws firmly. On controls
where the plate has no temperature
markings, use a chart to determine the
temperature degree between letters.
Turn
the calibration plate
counter-clockwise if the test reading is
higher than the dial setting, or clockwise
if the reading is lower than the dial
setting.
D.) Replace dial.
NOTE: If the above adjustment is prevented by
the two loosened calibration lock screws being
in contact with the ends of the screw clearance
slots in the calibration plate, remove the screws
and after turning the calibration plate to the
proper location, reassemble screws in the other
tapped holes designed for them.
RECALIBRATION CHART
Dial Range Degrees F Between Letters Calibration Mark
200-500 50 Degrees 350 Degrees