Guide

6. While firmly holding the calibration stem in, turn the dial to the
actual temperature shown on the test instrument. Release the
pressure on the calibration stem and remove the screwdriver.
Replace the dial insert.
7. Set the temperature control dial to 400 degress. Once again,
check the temperature as instructed in steps 3 & 4. If the
temperature is not within 10 degress with a dial setting of
400 degress, then the sensing element is inoperative and the
control should be replaced.
Fryer Thermostat Calibration
1. Remove front cover of valve with Phillips screwdriver.
2. Remove knob by using flat screwdriver.
3. To increase temperature, turn brass knob counterclockwise.
Turn knob slowly until burner kicks on and wait for it to shut off,
check temperature, adjust until temperature reaches approx.
395 at #7.
MANUAL PILOT SYSTEM
When heat is applied to the thermocouple, a voltage is produced
that will energize the magnetic head in the safety valve. When
the pilot flame is extinguished, the voltage produced by the
thermocouple will decrease. Thus, both the pilot and the main gas
will be shut off at the safety valve.
THERMOSTAT CALIBRATION: (See Fig. 6)
NOTE: Once the appliance is properly installed, all thermostats
associated with the equipment must be checked for proper
calibration. The thermostat is a precision instrument and is
carefully calibrated at the factory. Field calibration is seldom
needed and should not be attempted unless a considerable
amount of experience proves that the control is not maintaining
the dial set temperature. If calibration is needed, it is
recommended that ONLY a qualified service technician perform
the adjustment.
NOTE: Always ensure the by-pass flame is properly adjusted prior
to any attempt to recalibrate.
To check for proper temperature during test or recalibration,
always use an accurate test instrument with the proper sensing
device. This will ensure the correct temperature is being recorded.
On all griddle plates, use a disc probe and drop a few drops of
oil on the plate. Place the disc probe into the oil flat against the
griddles surface.
When placing the sensing probe in the oven, always ensure the
oven probe hangs freely approximately at the center of the oven.
Do not permit the probe to touch the sides or the racks of the
oven.
Figure 6
Robertshaw BJWA Thermostat
CALIBRATION STEPS:
1. Remove the thermostat dial and pull out the metal insert.
2.
Replace the thermostat dial and set the dial to the 350 degree
mark. Light unit.
3. Light oven and allow a sufficient amount of time for the
temperature to stablize (approximately 15 minutes).
4. Check temperature at five minute intervals uniti two successive
temperature readings are within 5 degrees of each other.
NOTE: If the control does not read within 10 degress of the dial
setting (350 degrees), the control should be recalibrated. For
recalibration proceed as follows:
5. Hold thermostat dial firmly, insert a screwdriver through the
center of the dial and push on the calibration stem. CAUTION:
DO NOT turn the stem.
8 9