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Technical Information

4.5

Temperature Monitoring

4.5.1

T 1515, T 1520, T 1526, T 1565 C and T 1570 C

Drum temperature is monitored by the NTC (negative thermal coefficient)

temperature sensor mounted in the front of the fan housing.

As the temperature within the drum area increases, the resistance of the sensor

decreases. The sensor resistance is monitored by the electronic and is used to

calculate the drum temperature. The temperature is regulated by the electronic

via the two heater relays. When the electronic switches the heater relay(s) on,

higher voltage contacts within the relay(s) close and allow power to the heater

element(s).

4.5.2

T 1576

Drum temperature is monitored by two NTC (negative thermal coefficient)

temperature sensors. One sensor is mounted in the heater bank assembly; the

second sensor is mounted in the fan housing. Both sensors are monitored by the

electronic and are used to calculate the drum temperature.

The temperature is regulated by the electronic via the two heater relays. When

the electronic switches the heater relay(s) on, higher voltage contacts within the

relay(s) close and allow power to the heater element(s).

Should the main motor fail to operate, airflow does not occur, resulting in

increased temperatures in the heater bank and drum area. Two temperature

limiters (see Figure 4-5, Item 1) are attached to the heater bank and electrically

interrupt the heating circuit should the temperature exceed a preset threshold.

The appliance can no longer produce heat, as the temperature limiters are non-

resettable SODs (single-operation devices) in accordance with product approvals.

T 15xx Dryers