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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).