SCF-050 Manual
27
b.
When the board senses the Vacuum switch the exhaust fan speed drops to the #1
setting and runs for 5 minutes.
c.
After 5 minutes the board checks for “Proof of Fire” and starts feeding fuel on the
#1 setting. (See section on Diagnostic Features on page27) If the board senses
P.O.F. then the Furnace has started successfully.
d.
If the board fails to sense P.O.F. it will repeat the last step and continue feeding
fuel on the #1 setting for 5 minutes.
e.
The board will check for P.O.F. again. If the board still fails to sense the Proof of
Fire switch the Furnace will go into “Safety shutdown” (See section on
Diagnostic Features on page 27.)
If this happens, repeat steps 1 through 4 from the section on Lighting Your Furnace.
Shutting The Furnace Off
(Refer to Figure 13)
1. Press the On/Off switch (2) once; the lights will go off and the fire will go out in a
few minutes. The board essentially goes into “Safety shutdown”.
2. As long as the temperature within the Furnace remains above 110°F the Combustion
(Exhaust) Fan will continue to run. When the P.O.F. switch drops out the Combustion fan
will run for another 10 minutes and finally shut down completely.
4.
NEVER unplug the Furnace to shut it off. Doing so may cause a
significant amount of smoke to enter the room.
Diagnostic Features of the Control Board
The #2 LED and the #3 LED lights on the LED Light bar as show in figure13 will flash
to give a diagnostic code to help in diagnosing problems that may occur.
These conditions fall into 2 categories:
a.
Heat related issues.
b.
Vacuum related issues.
