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W. Dryer operates but is taking too long to dry...
1. Exhaust ductwork run too long or is undersized...back pressure must be no less than 0 and cannot exceed
0.3 inches (0.74 mb) water column (W.C.).
2. Restriction in exhaust ductwork...
a. Dryer back draft damper is sticking partially closed.
b. Restriction/obstruction in ductwork...
1) Check ductwork from dryer
ALL the way to the outdoors.
3. Insufficient make-up air.
4. Blower (impellor/fan) is rotating in the wrong direction (for 3-phase [3ø] models only).
5. Lint screen is dirty or
is not being cleaned often enough.
6. Inadequate airflow...
a. Blower (impellor/fan) failure.
GAS MODELS...
1. Low or inconsistent gas pressure.
Natural gas pressure...3.5 inches (8.7 mb) of water column.
Liquid propane (L.P.) gas pressure...10.5 inches (26.1 mb) of water column.
2. Poor air/gas mixture at burner (too much or not enough air) at the burner...yellow or poor flame pattern...
a. Not enough make-up air.
b. Restriction in the exhaust ductwork.
c. Gas pressure too high.
d. Blower (impellor/fan) is rotating in the wrong direction (for 3-phase [3ø] models only).
e. Burner orifice size (drill measurement size [D.M.S.]) too large for application (i.e., high elevation).
3. Sail switch is fluttering...
a. Restriction in the exhaust ductwork...
1) Lint screen is dirty or is not being cleaned often enough.
4. Gas supply may have too low a heating value.