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W. 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/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 and/or inconsistent gas pressure.
Natural Gas pressure - must be between 3.5 and 4.0 inches of water column (W.C.).
L.P. (liquid propane) Gas pressure - must be between 10.5 and 11.0 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.
c. Gas pressure too high.
d. Impellor (fan and blower) is rotating in the wrong direction only (for 3ø Models ONLY).
e. Burner orifice size (D.M.S. [drill material size]) too large for application (i.e., high elevation).
3) Sail switch is fluttering ...
a) Restriction in the exhaust ...
1) Lint screen is dirty or is not being cleaned often enough.
4) Failed burner hi-limit...opens at incorrect temperature.
5) Gas supply may have too low a heating value.