American Dryer Corp MDG-75 manual Dryer operates but is taking too long to dry

J.Dryer operates but is taking too long to dry...

1.Exhaust duct work run is too long or is undersized... back pressure cannot exceed 0.3 inches water column (W.C.).

2.Restriction in duct work ...

a.Dryer back draft damper is sticking partially closed.

b.Restriction and obstruction in duct work ...

1)Check duct work from the dryer all the way to the outdoors.

3.Insufficient make-up air.

4.Impellor (fan and blower) is rotating in the wrong direction only (for 3ø Models ONLY).

5.Lint screen is dirty or is not being cleaned often enough.

6.Inadequate air flow ...

a.Impellor (fan and blower) failure.

GAS MODELS ...

1)Low or inconsistent gas pressure.

Natural Gas pressure - must be between a consistent 3.5 inches of water column (W.C.). L.P. (liquid propane) Gas pressure - must be a consistent 10.5 inches of water column (W.C.).

2)Poor air and gas mixture at burner (too much gas or not enough air) at the burner...yellow or poor flame pattern ...

a.Not enough make-up air.

b.Restriction in the exhaust.

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