Heat Sensor - Thermador PH30ZS Service Manual

PHZ Service Manual
The PHZ hood is equipped with a heat sensor
that is located inside the input boar d. 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 r eset at 140ºF
(60ºC).
Here's ho w it w orks when the
sensor detects e xcessiv e heat:
1) If the ventilator is "off," the ventilator will turn
on at low speed and the corresponding LED will
blink.
2) If the v entilator is "on" at an y speed, the
corresponding LED will blink. No speed change
will occur.

Heat Sensor

While the sensor is activated due
to excessiv e 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 r esets 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 pr otection is not w orking
due to a damaged sensor. In this case, the three
speed indicator LED's will start blinking.
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Serviceab le Component