Part # 138683 (01/08)
Page 19
3. Continue to monitor the oven temperature, recording
the readings at 5 minute intervals until three successive
readings are within 5°F, (2°C), of each other.
If the temperature does not read within 15°F, (8°C), of the dial
setting, recalibrate as follows.
1. Remove the oven temperature control dial, making sure
the setting is not disturbed.
2. Hold the calibration plate, (located directly behind the
control dial), and loosen the two calibration lock screws
until the plate can be rotated independently of the
control.
3. Turn the calibration plate until the temperature indicated
on the plate corresponds with the reading on the test
instrument. Hold the plate in place and tighten the
screws firmly.
4. Repeat step 3 in the previous section, checking the
temperature to ensure the adjustment has been made
properly.
5. Replace the temperature control dial.
NOTE: If adjustment of the calibration plate is prevented by
the position of the lock screws, the screws can be moved to
other holes that have been tapped for them.
BJWA Griddle Thermostat
(H/P 280 Series Only)
When the griddle surface reaches the temperature for which
the dial is set the control cuts down the flow of gas to the
amount required to keep the griddle at that temperature.
The control must be adjusted to pass enough gas to keep the
entire burner ignited. To properly adjust the by-pass setting,
proceed as follows:
1. Light the burner by turning the dial fully “ON.”
2. After 5 minutes, turn the dial clockwise to a point slightly
past, (to the right of ), the first mark on the dial.
3. Remove the dial by pulling it straight off.
4. With a screwdriver, turn the by-pass adjustment screw
counter-clockwise to decrease the flame, or clockwise to
increase the flame, until there is a minimum flame along
the entire burner.
CALIBRATION
SCREW
BY-PASS
ADJUSTMENT
SCREW
ROBERTSHAW BJWA
THERMOSTAT
Calibration
1. Use a Robertshaw test instrument with a disc-type
thermocouple, or a reliable “surface” type thermometer.
(NOTE: A drop of oil on the face of the disc will provide for
better contact.)
2. Turn ALL griddle control dials to 400°F, (240°C). allow the
temperature to stabilize by waiting for the thermostat(s)
to cycle three times before taking a temperature reading.
3. Check the temperature reading when the control cuts
down to by-pass, by placing the sensor firmly on the
griddle surface directly above the sensing bulb of the
control. Test instrument should read from 350° to 410°F,
(196° to 213°C). If the dial setting does not agree with
the test instrument reading within the above limits,
recalibrate.
NOTE: NO ATTEMPT SHOULD BE MADE TO RECALIBRATE
THE GRIDDLE CONTROL WITHIN THE WARRANTY PERIOD IF
THE TEMPERATURE IS WITHIN ±20°F OF THE DIAL SETTING.
RECALIBRATION SHOULD BE PERFORMED IF THE CONTROL IS
FOUND TO BE INACCURATE BY MORE THAN ±20°F, AND LESS
THAN ±50°F. IF THE CONTROL IS FOUND TO BE INACCURATE
BY MORE THAN ±50°F DURING THE WARRANTY PERIOD, THE
CONTROL WILL BE REPLACED UNDER WARRANTY.
To recalibrate:
1. Remove the dial and push out the center metal insert.
2. Replace the dial without the insert.
3. Holding the dial firmly in place, insert a screwdriver
through the center of the dial and seat it in the slot in
the calibration screw. DO NOT TURN THIS SCREW! Exert
pressure on the screwdriver to push the calibration stem
inward.
ADJUSTMENTS Continued
