Carter-Hoffmann PH912 - Manual (Page 6)

6
CALIBRATION PROCEDURES
CAUTION:
HOT SURFACE
Inner and outer surfaces of
the unit will be very hot dur-
ing and after operation.
THERMOMETER CALIBRATION
Place and oven thermometer in the center of the cabinet. Turn
heater on; turn thermostat to maximum setting and wit approximately
45 minutes. Open the door and check inside thermometer tempera-
ture. If recalibration is required, pry the plastic cover off the dial body
and with a small flat blade screwdriver, insert into the pointer as
shown. Carefully turn the pointer with your finger to the correct set-
ting. Be careful not to bend the pointer, as it is very fragile.
THERMOSTAT CALIBRATION
If additional heat range is desired, unplug unit, remove black thermo-
stat knob, insert small straight blade screwdriver into opening and
turn limit control set screw counterclockwise one full turn (see dia-
gram). Replace the thermostat knob and turn clockwise to reach new
maximum temperature. Repeat procedure until desired temperature
is reached. Each 1/4 turn of the calibration set screw will raise the
element heating capacity by 25°F to 35°F degrees.
If a reduction of heat is desired, turn limit control set screw clockwise
one full turn. Hold the door open allowing the cabinet to cool until
inside temperature is below the temperature desired. Close the door
and allow unit to rise to new maximum temperature. Repeat proce-
dure until desired temperature is reached.
Operating ranges:
- air temp: 80ºF-210ºF
THERMOMETER CALIBRATION
THERMOSTAT CALIBRATION