6."HEAT" Circuit (Steam Models):

IMPORTANT: The L.E.D. indicator on the computer board that reads "DOOR" must be on in order to successfully troubleshoot the following.

Theory of the "HEAT" Circuit (Steam):

When the computer senses a drop in temperature below the preset temperature it will send 24 A/C volts out of pin #4 of the 15 pin computer harness. There is one heat safety device in the dryer that will stop the voltage from reaching the steam damper valve. The voltage must pass is the 225º thermostat. If the 225º thermostat senses a temperature of 225º or higher the voltage will stop here at the thermostat. Once the temperature drops the thermostat closes and the voltage will now be able to reach the steam damper valve.

Path of Voltage for the "HEAT" Circuit (Steam):

The 24 A/C voltage leaves the computer on pin #4 it then travels to terminal block #2 position #3. Now this voltage travels through connector J2, pin #3 and connector J6 pin #4. After this J6 connector the voltage now is present at the 225º thermostat, the voltage then passes through the thermostat and travels through the same two connectors... different pin #'s of course, J6 pin #3 and J2 pin #4. This voltage now is present back on terminal block #2 but now it's position #4. The voltage now passes through J8 pin #1 then directly to the steam damper valve. The other side (GND side) of the A/C 24 volts from the steam damper valve travels through J8 pin #2 and then to TB #7 (GNDD).

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American Dryer Corp AD-200 service manual Heat Circuit Steam Models, Theory of the Heat Circuit Steam

AD-200 specifications

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