Section 6
Explanation of Controls
Models 6540/6541, 6550/6551, 6542/6543,
6552/6553, 6544, and 6554
On/Off Switch
- The on/off switch controls the flow of all electric power
to the oven. The blower motor in the mechanically convected models
will only be in operation with the power switch ON, and the timer not
at setting "0".
Temperature Control Knobs
- Two control knobs, Temperature Control
and High Temperature Limit set the operating temperature and safety
set points respectively. The numerical graduations do not refer to any
specific temperature, but are simply for reference.
Temperature Control Pilot Lamps
- These lamps indicate the status of the
controls. When the lamp above the Temperature Control is illuminated,
this indicates electric current is being applied to the heater. It is normal
for this lamp to cycle on and off during the operation of the oven. The
lamp above the High Temperature Limit is illuminated only when first
set. If this lamp is ON, it indicates that oven is controlling on the High
Temperature Limit thermostat which has taken over control of from the
Temperature Control thermostat.
When the High Temperature Limit lamp comes on it is due to either a
Temperature Control thermostat failure or that the High Temperature
Limit thermostat is set too close in value to the temperature control. In
this case a slight turn clockwise for the High Temperature Knob should
increase the span between them.
Timer
- The timer controls how long the oven will stay on if a predeter-
mined time between one to twelve hours is desired. With the Timer set
to the HOLD position the oven will run continuously. If the Timer
knob is first turned past two hours then set to some value the oven will
then turn off after that value has timed out.
Glass Thermometer
- Used to indicate oven temperature and determine
proper thermostat settings.
Light Switch
- Turns interior lamp on and off.
3177885 Thelco Oven 6-1
Thermo Electron Corporation
