Carter-Hoffmann CW4 - Manual (Page 7)

7
NORMAL OPERATION
FOR UNITS WITH THERMOSTATIC CONTROLS
THERMOSTAT CALIBRATION
If additional heat range is required in the cabinet, unplug
the heating unit, remove the thermostat knob, insert a small
straight blade screwdriver into opening in center and turn
limit control set screw counter-clockwise one full turn. See
diagram on left.
Replace thermostat knob and turn clockwise to reach new
maximum temperature. Repeat this until desired tempera-
ture is reached. Each 1/4 turn of the calibration set screw
will raise the element heating capacity by approximately 25-
35ºF.
If a reduction of heat is desired, turn limit screw clockwise
one full turn. Hold the door open allowing unit to cool until
inside temperature is below the desired temperature.
Close the door and allow unit to rise to a new maximum
temperature. Repeat this until desired temperature is
reached.
NOTE:
Heating system should cycle at least
two times after the last adjustment to
achieve accurate calibration.
THERMOMETER CALIBRATION
Place an oven thermometer or accurate temperature meter
in the geometric center of the cabinet. Power heating sys-
tem up and turn thermostat clockwise, to maximum setting
and wait approximately 45 minutes.
Open the door and check inside thermometer temperature.
In 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 match the sta-
bilized internal temperature. Be careful not to bend the
pointer, as it is very fragile.
to increase turn set screw counter clockwise
to decrease turn set screw clockwise
Set
screw