American Dryer Corp ML-310 Phase 7 service manual Second Visual Check

e. Troubleshooting Flowchart - Quick Reference...

			Second Visual Check
			(Does Main Burner Ignite?)
	Does		Is manual
			knob on the Gas Valve
main burner
		No
			in the “ON”
	light?
			position?
	Yes			Yes

Turn knob to “ON/OPEN” position.

No Energize system and check for proper operation.

Go To

Third Visual

Check

Restore gas supply. Energize system and check for proper operation.

No

Is

gas available

at the

source?

Is

dryer Internal Gas Shut-Off Valve and

ALL External Gas Shut-Off

Valves in the open

position?

Yes

Turn manual knob on the Gas Valve to the “OFF” position.

Connect a manometer to the Gas Valve outlet pressure tap.

	Turn
	manual knob on
	the Gas Valve to the
	“ON” position.	Yes
No
	Energize the system.
	Is outlet pressure
	detected?

No

Correct supply pressure. Energize system and check for proper operation .

No

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

Energize

system. Is 24 VAC present across leads at the Gas

Valve?

		With
	system energized,
	is 24 VAC present
No
	across the “MV” and “GND”
	terminals of the DSI
	Module?
			No
		Yes

Yes

Check Spark Electrode for proper gap and insure that the spark is in the path of the gas flow...

Refer To Service Section.

Yes

Replace the Gas Valve. Energize the system and check for proper operation.

Replace High

Voltage (HV)

leads

Energize system and check for proper operation.

Replace

DSI Module

Make the necessary corrections. Energize system and check for proper operation.

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