Garland MASTER SERIES HEAVY DUTY GAS RANGES AND CHAR BROILERS, ALL M/MS/MST SERIES MODELS - Manuel (Page 20)

Part # 1382680 Rev 3 (05/10/11) Page 20
BJWA Griddle Thermostat
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.
4. While holding the calibration stem pushed inward with
the screwdriver, turn the control DIAL to the temperature
indicated on the test instrument. Release pressure on the
calibration stem.
5. Remove the dial from the control, replace the dial insert,
and reinstall the dial on the control.
6. Set the dial to 450° F, (232° C). Check temperature
as before. If the temperature is not now within the
acceptable ±20°F, (4°C), range, the sensing element is
inoperative and the control should be replaced.
ADJUSTMENTS Continued