Heat Sensor - Thermador PH30ZS Service Manual

PHZ Service Manual
The PHZ hood is equipped with a heat sensor
that is located inside the input board. It is not
visible or field replaceable. The entire input board
must be replaced. The sensor detects over tem-
perature conditions and turns the fan on to
protect the components. The sensor is set to
activate at 165ºF (75ºC) and reset at 140ºF
(60ºC).
Here's how it works when the
sensor detects excessive heat:
1) If the ventilator is "off," the ventilator will turn
on at low speed and the corresponding LED will
blink.
2) If the ventilator is "on" at any speed, the
corresponding LED will blink. No speed change
will occur.

Heat Sensor

While the sensor is activated due
to excessive heat:
1) The ventilator speed can be changed or turned
off and the corresponding LED will blink.
2) All lights will remain operational.
3) When the sensor resets back to 140ºF, the
control will continue to operate at the existing
setting though the LED will stop blinking,
indicating there is no longer an over temperatu-
re condition.
Fault code:
The circuit is equipped with an alarm indicating
that the heat sensor protection is not working
due to a damaged sensor. In this case, the three
speed indicator LED's will start blinking.
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Serviceable Component