Service Manual for Thermador Professional Series Custom Inserts
Page 8 of 16
4 OPERATION
4.1 Control and Control Panel
The 120V /60Hz / 60A control board is populated by 6 push-buttons
(buttons 7and 8 have been removed from the board) and LEDs for the
control panel, and serves as a selector switch. The mode is selected
when a button is pressed. The control board then sends commands to
the relay board / power supply through the ribbon cable used for
communication.
The LED above each button will illuminate when that particular
function is activated.
4.1.1 AUTO Function
When the automatic blower function is enabled by pressing AUTO, the
function will control both the activation and speed of the fan based on
the temperature read by the heat sensor on the control board.
If the AUTO function is selected while the blower is already running,
(LO,MED,HI, or DELAY), the control will disable that function and
immediately initiate the automatic function.
When AUTO is enabled, the control will poll the temperature every 30
seconds and automatically adjust the blower speed accordingly.
TEMPERATURE READING BLOWER ACTION
< 86° F (30°C) Disabled
86° - 103° F (30 - 39°C) Low speed
104° - 121° F (40 - 49°C) Medium speed
122° - 166° F (50 - 74°C) High speed
4.1.2 DELAY Function
If the DELAY button is pressed when the blower is off, the fan will turn
on at the high speed setting for 10 minutes, then shut off.
If the blower is operating when the DELAY button is pressed, the fan
will run for 10 minutes at the currently selected speed, then shut off.
4.1.3 Clean Filter Reminder
After 40 hours of operation, the LED above the FILTERS button will
illuminate, indicating that the filters need to be cleaned.
Pressing the button for 3 seconds will reset the 40-hour period and
turn the LED off. The activated tone will occur after reset.
4.1.4 Heat Sensor
The control board includes an over-temperature sensor to protect the
hood from high temperatures which may damage components.
Over-Temperature Condition - The sensor is set to activate at 167º F
(75º C) and reset when temperature returns to 140º F (60º C).
When the over-temperature condition is activated, the ventilator will
turn on high, and the corresponding LED will blink at .5 second
intervals.
While the over-temperature condition is activated, the ventilator speed
and delay switches are not functional. Light controls will remain
operational. When the sensor cools and once again reaches 140º F
Figure 4 Control board and control panel