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1. Differential Adjustments. How quickly the controller responds to drift in temperature is controlled
by the differential adjustments setting. The number entered tells the controller how many degrees the
temperature is allowed to drift from the set point before corrective action is taken. The factory setting is
1, i.e. the controller responds after a drift of only one degree. This is the tightest setting. The controller
may be set to operate in both heating and cooling applications, and operation of the chamber requires
that a positive value be entered for the “dF” setting. Do not attempt to operate the oven with a negative
value or a value of zero entered.
2. HI and LO Adjustments. These settings control the range of temperatures within which the set points
can be adjusted. For example, if “LO” is set to 150 and “HI” to 160, only set points between these two
numbers can be entered using the set function described above. If both are set to the same number, a
xed set point is established. Factory settings are LO=174 and HI=176.
3. Calibration Adjustment. A calibrating adjustment of up to +/– 30°F can be entered here to compensate
for the fact that temperature varies between top and bottom of the chamber, and to account for sensor
shielding and any sensor variations. The factory-set calibration adjustment is 0.
4. Programming Sequence. Press and release the °F switch. “dF is displayed. Press and release °F switch
a second time. The current value of “01” should be displayed. If another number appears, use the raise-
lower buttons to set “01”. Press and release the °F switch again. “HI” should be displayed. Press and
release °F and the HI value of 176 should be displayed. Use the raise-lower buttons to change this
value if necessary. Press and release °F and “LO” will be displayed. Press and release °F again and the
LO value of 174 should be displayed. Use the raise-lower buttons to change this value. Press and re-
lease °F and “CAL” will be displayed. Press and release °F and the current calibration value of “01” is
displayed. Adjust as needed using the raise-lower buttons. Press and release °F and the screen should
go blank for a brief time, and then, the current temperature of the cabinet will be displayed. (IMPOR-
TANT: If the programming sequence is interrupted for a period of 15 seconds, or if it is not carried