Henny Penny 500 Service Manual page 92

ode! 5
156-i
Whenever the thermostat fails to maintain the selected
temperature within +5"F of the thermostat setting, it
should be re-calibrated.
To calibrate the thermostat, it is necessary to perform
step increases in the temperature of the shortening.
Follow this procedure:
1. Place the SOFTKRIS switch in the
SOFT position
and the main power switch in the POWER position.
Be sure there is shortening in the frypot.
2. Set the thermostat knob to 250°F.
3. Allow enough time for the shortening to heat.
When the shortening reaches the set temperature
on the thermostat, the indicator light will go off.
Usually, it will take no longer than 15 minutes for
the shortening to heat to the set temperature.
4. Remove the fry basket from the shortening.
5. Stir the shortening with the basket handle.
6. Measure the temperature of the shortening using
an accurate, mercury tube type, deep fat ther-
mometer. It should be capable of measuring tem-
peratures in the 250°F to 400°F range. (Henny
Penny part number 12106.)
nsert the thermometer near the center of the
frypot to a depth of about 3 inches below the level of
shortening.
8. Carefully stir the shortening with the thermome-
ter.
9. Allow the mercury in the thermom
to rise to the
temperature of the shortening.
d the ther-
mometer straight up and down.
indicator light goes off.
the correct temperature rather th
erature.