Manual Reset Burner Hi-Limit Instructions - ADC AD-25V Installation Manual

For Models with DSI
Module (Type I)
Theory of Operation: Start the drying cycle. When the
gas burner ignites within the chosen trial for ignition time
(6-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 3 retries/trials (the initial try and 2 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" (L.E.D. diagnostic indicator flashes).
A steady L.E.D. indicator indicates normal operation. No
L.E.D. indicator indicates a power or an internal failure has
occurred.
For Models with DSI Module (Type II)
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 3 retries/trials (the initial try and 2 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.
26
Manual Reset
Burner Hi-Limit Instructions __________
Phase 7
This dryer was manufactured with a manual reset burner
hi-limit thermostat, which is monitored by the Phase 7
computer. If the burner hi-limit is open prior to the start of the
drying cycle, the dryer will start momentarily and then shut
down, the Phase 7 computer will display "burner HIGH LIMIT
fault" with an audio indication.
If the burner hi-limit opens during a drying cycle, the Phase 7
computer will also display the same error code described
above, along with an audio indication. If the drum temperature
is above 100° F (38° C), the dryer will continue to run with no
heat for 3 minutes or until the drum temperature has dropped
below 100° F (38° C). For non-coin models, the "Stop/Clear"
key on the Phase 7 keypad must be pressed to clear the
error condition. For coin models, the "Pause" key must be
held down for 3-seconds to clear the fault. The open burner
hi-limit must be reset "manually" prior to the start of the next
cycle.
Mechanical Timer
This dryer was manufactured with a manual reset burner
hi-limit thermostat. If the burner hi-limit is open prior to the
start of the drying cycle, or during the cycle, the dryer will not
recognize the open state of the burner hi-limit and will start
or continue through the drying cycle with no heat. Manual
reset hi-limit must be reset manually.
This hi-temperature condition may be caused due to a
restricted exhaust, poor airflow, or improper burner operation.
The location of the burner hi-limit is on the right side of the
burner box, looking at the burner from the back of the dryer.
Discontinue power to dryer before attempting to reset
hi-limit.
American Dryer Corp.
WARNING
!
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