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c) Dryer level switches circuit branch...
(1) On 1-way tilt models, this switch is in series with the dry enable.
(2) On 2-way tilt models...one (1) pole of each of the two (2) level switches (LS1-A and LS2-
A) is in series with the dryer level relay and the other pole is in series with the opposite
piston. IF THE OPPOSITE SIDE IS NOT LEVEL, THE DRYER WILL NOT TILT.
d) Lint drawer closed circuit branch...
The lint drawer closed switch is located in the front of the dryer. When the lint drawer is closed,
it closes the switch contacts, powering the lint drawer closed relay. Then, the dry enable relay
will close, supplying 24 VAC to the TSX 07 PLC. When the lint drawer is closed, the lint drawer
light emitting diode (L.E.D.) is on.
b. Phase 7 Microprocessor Controller (computer)
1) The temperature sensor probe is a bullet shaped device that is located above the lint basket. This
temperature sensor probe is used to sense the temperature in the exhaust of the dryer. The
temperature sensor is a two (2) terminal monolithic integrated circuit temperature transducer that
provides an output current proportional to absolute temperature. The transducer acts as a high
impedance temperature dependent current source of 1µA/ºK. The typical accuracy of this probe is
+/- 1.5º C (+/- 2.7º F). In a case where the temperature reaches 220º F (104º C), the Phase 7
microprocessor controller (computer) will shut down and the L.E.D. will display “Exhaust High
Temp Fault.” To restart a cycle the “STOP/CLEAR” button must first be pressed.
To check a temperature sensor you first need a digital multimeter (DMM) with a diode check
position. Put the meter on diode check, place the “red” lead of the meter on the “black” lead of the
temperature sensor and the “black” lead of the meter on the “white” temperature sensor wire. At
this point you should get no response from meter (infinite). If you get a reading the temperature
sensor is defective.
ºF =
9
(ºC + 32)
5
ºC =
5
(ºF - 32)
9
TEMPERATURE SENSOR CURRENT =
ºC + ºK (273.15)
= MICROAMPS (µA)
1,000,000