ADC AD-200 - Manual (Page 30)

26
e. Troubleshooting Flowchart - Quick Reference...
Second Visual Check
(Does Main Burner Ignite?)
Does
main burner
light?
Is manual
knob on the Gas Valve
in the “ON”
position?
Is
dryer Internal Gas
Shut-Off Valve and
ALL External Gas Shut-Off
Valves in the open
position?
Go To
Third Visual
Check
Yes Yes
Turn
manual knob on
the Gas Valve to the
“ON” position.
Energize the system.
Is outlet pressure
detected?
With
system energized,
is 24 VAC present
across the “MV” and “GND”
terminals of the DSI
Module?
Replace the Gas Valve.
Energize the system and
check for proper operation.
Turn manual knob on the Gas Valve to the
“OFF” position.
Connect a manometer to the Gas Valve
outlet pressure tap.
Yes
Replace High
Voltage (HV)
leads
Yes
Energize system
and check for
proper operation.
Replace
DSI Module
No
Energize
system. Is 24 VAC
present across leads
at the Gas
Valve?
No
Yes
Is
gas available
at the
source?
Yes
Restore gas supply.
Energize system and
check for proper
operation.
No
Check Spark Electrode for
proper gap and insure that
the spark is in the path of
the gas flow...
Refer To Service Section.
Is outlet
Water Column (W.C.)
pressure correct?
Natural 3.5” - 4.0” W.C.
(8.7 mb - 9.9 mb)
L.P. 10.5” - 11.0” W.C.
(26.1 mb - 27.4 mb)
Yes
No
Make the necessary
corrections.
Energize system and
check for proper operation.
Yes
Correct supply pressure.
Energize system and
check for proper operation
.
No
Turn knob to “ON/OPEN”
position.
Energize system and
check for proper operation.
No
No
No