ADC AD120i, Installation & Operator'S Manual, Page: 26 / 30

26 American Dryer Corp. 113546 - 2
Theory of Operation: Start the drying cycle. When the gas
burner ignites within the chosen trial for ignition time
(8-seconds), the flame sensor detects gas burner flame and
signals the DSI module to keep the gas valve open as long as
there is a call for heat. The DSI module will “LOCKOUT” if the
gas burner flame is not sensed at the end of the trial for ignition
period. The trial for ignition period will be repeated for a total
of three retries/trials (the initial try and two more retries/trials).
If the flame is not sensed at the end of the third retry/trial
(inter-purge period of 30-seconds), the DSI module will
“LOCKOUT” (a red L.E.D. diagnostic indicator will flash).
An unlit red L.E.D. diagnostic indicator indicates normal
operation.
A lit green L.E.D. diagnostic indicator indicates dryer controller
is calling for heat and that all interlocks have been satisfied.
!
Warning
To avoid the hazard of electrical shock and contact
with moving parts, discontinue electrical supply to
the dryer before removing the back guard.
6 Months
Inspect and remove lint accumulation in the dryer's air handling
systems. This includes customer furnished make-up air
openings, exhaust ductwork systems, and from the dryers
internal exhaust ducting.
NOTE: The build up of lint in the air handling systems can
create a potential fire hazard. It can also reduce the flow of
combustion, exhaust and ventilation gases, reducing dryer
performance.
Cleaning of the dryer's internal exhaust may require removing
the lint screen. See the instructions above for removing the
lint screen.
Check any back draft dampers in the exhaust ductwork.
Inspect and remove any lint which can cause the damper to
bind or stick. A back draft damper that is sticking partially
closed can result in slow drying and the shutdown of heat
circuit safety switches and thermostats.
Procedure for Functional Check
of Replacement Components __________
DSI Module
!
Manual Reset Hi-Limit Instructions
Warning
Disconnect power before attempting to reset any
manual hi-limit!
This dryer was manufactured with two hi-limit manual reset
thermostats. One is located on the burner and one in the
exhaust. The burner hi-limit thermostat is located in the front
center of the dryer behind the control door. The exhaust
hi-limit is located in the duct above the lint trap.
To reset the burner high limit, disconnect the power, open the
control door and support it with the prop rod. Push the red
button in the center to reset. Close the control door. Restore
the power.
To reset the exhaust hi-limit, disconnect the power and open
the lint door. Remove the lint screen clamp (6) screws (refer
to figure 6). Above the lint trap and in the duct below the
tumbler are three sensors. The flat one on the far left is the
hi-limit Thermostat. Remove the two screws securing the
thermostat and remove it. Push the red button in the center
to reset. Replace the thermostat. Replace the lint screen
clamp. Close the lint door. Restore the power.