3177885 Thelco Oven 7-3
Thermo Electron Corporation
Section 7
Section title
Models 6540/6541, 6550/6551, 6542/6543,
6552/6553, 6544, and 6554
A mercury-in-glass thermometer is provided for the models listed above.
Insert thermometer through the hole in the vent shutter cap so that the
three metal fingers punched in the cap converge toward the center of the
cap and the glass ring on the thermometer rests on top of the cap. The
metal fingers may have to be bent slightly to grip the thermometer.
1. Press the ON/OFF power switch to the "ON" position.
2. Turn the Timer knob to the “Hold” position.
3. Rotate the High Temperature Limit knob fully clockwise.
4. Rotate the Temperature Control knob to some median position.
5. Allow sufficient time for the chamber to heat and observe the
temperature on the thermometer in the vent cap. The lamp above the
Temperature Control Knob should turn on and off at fairly regular
intervals to indicate that control has stabilized at a particular set point.
6. If thermometer indicates that chamber temperature is below desired set
point, and the lamp above Temperature Control has been turning on
and off, rotate Temperature Control slightly clockwise. Turn
Temperature Control slightly counterclockwise if the thermometer
indicates chamber temperature is above the desired setpoint.
7. When thermometer indicates chamber is at desired temperature and
the lamp above Temperature Control is cycling on and off at fairly
uniform intervals, begin to turn High Temperature Limit Knob slowly
counterclockwise. The moment the lamp above High Temperature
illuminates, the lamp above Temperature Control turns off. Rotate
High Temperature Limit clockwise just until the lamp above High
Temperature Limit is off and the lamp above Temperature Control
turns on. The High Temperature Limit has now been properly set.
8. Timed Control - The Timer knob, set in the Hold position, allows the
oven to run continuously. To run the oven for any predetermined time
between one to twelve hours, first set the oven temperature, using the
Temperature Control and High Temperature Limit knobs as previously
explained, with the Timer in Hold position. When the oven is holding
the desired temperature, turn Timer knob past 2, then set to desired
number of hours for the oven to run. When the timer runs out, the
oven shuts off.
9. To turn off the oven, press power switch to OFF position. Controls
may be left in position to resume at the same temperature later.
