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Section 4 Explanation of Controls
4-2
Freas Safety Oven
"TEMPERATURE" Controller (continued)
1. Set (SET) key is used to
access the set values for
Temperature Control.
2. Setting digit shift left key -
moves to and highlights digit
to be changed.
3. Set-value decrement key is
used to decrease the value of
the number highlighted.
4. Set-value increment key is
used to increase the value of
the number highlighted.
5. Present Value (PV) is the
actual chamber temperature.
6. Set-value (SV) is the
Temperature Set Value
Display (setpoint or desired
temperature).
7. First control output (OUT(1) lamp lights up when control output (heat) is
turned ON.
8. Not Used
9. Not Used
10. Not Used
11. Not Used
"Timed Heat":
It is a 12-hour, spring-wound timer with a "HOLD" feature. It turns off the
heater after preset time of the timer has elapsed, but the blower motor stays
energized and continues to circulate air through the chamber. During normal
continuous operation of the oven at a desired temperature, the timer knob should
be turned to "HOLD" position.
"Air Volume Control":
It is a mechanical setting and controls the amount of heated air entering the
working chamber. The reference dial is numbered 1 through 9. The setting is
made by turning the knob slightly counterclockwise, sliding it to a desired
position on the scale and locking it by turning clockwise.
Figure 4-1. Control Locations
Thermo Scientific
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