For 30 models only), Electric models – ADC AD-78 User Manual
Page 59
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1) Low and/or inconsistent gas pressure.
Natural G as pressure - m ust be between 3.5 and 4.0 inches of water colum n (W .C.).
L.P. (liquid propane) G as pressure - m ust be between 10.5 and 11.0 inches of water colum n (W .C.).
2) Poor air/gas m ixture at burner (too m uch gas or not enough air) at the burner...yellow or poor flam e
pattern...
a. Not enough m ake-up air.
b. Restriction in the exhaust.
2) Poor air/gas m ixture at burner (too m uch gas or not enough air) at the burner...yellow or poor flam e
pattern...
c. G as pressure too high.
d. Im pellor (fan/blower) is rotating in the wrong direction only
(for 30 Models ONLY).
e. Burner orifice size (D.M .S. [drill m aterial 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-lim it...opens at incorrect tem perature.
5) G as supply m ay have too low a heating value.
ELECTRIC MODELS...
1) No enough m ake-up air.
2) Restriction in the exhaust...
3) Lint screen is dirty or is not being cleaned often enough.
4) Im pellor (fan/blower) is rotating in the wrong direction only
(for 30 Models ONLY).
5) Failed electric elem ent(s).
6) Sail switch is fluttering ...
a) Restriction in the exhaust.
b) Sail switch is not adjusted properly.
GAS M ODELS...
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