Specifications

SCF-050 Manual

WARNING: These safet

features are desi

ned to protect life and propert

Bypassing these features voids all warranties and the safety listing of the Furnace.

The Diagnostic Lights flash as follows:

1. The Proof of Fire switch. This switch will sense the temperature of the Exhaust

rising during start up. If the Exhaust temperature does not reach 110 degrees F, or

if during use the temperature drops below 110 degrees F, the Furnace will go into

“Internal Alarm” and the Auger will quit feeding fuel. Once the Furnace

completes the safety shutdown, the #3 LED will start blinking. (See Figure 13 on

Page 24)

2. The High Limit switch. This sensor will sense if the unit reaches temperatures

that are too high for normal operation. If this happens the Auger will quit feeding

and the #2 and #3 LED lights will flash simultaneously.(See Figure 13 on Page

24)

3. The Vacuum switch. For the Furnace to operate correctly the firebox needs to be

sealed. During the first 30 seconds after the Furnace has been turned on the

control board will check to see if the switch senses negative pressure (Vacuum) in

the firebox of the Furnace. If there is no negative pressure, the Furnace will go

into “Safety shutdown” and the #2 LED will start blinking. (See Figure 13 on

Page 24)

“Power Reset”. If all the lights on the control board are lit up and the board is

unresponsive you must unplug the Furnace, wait 10 seconds and plug the Furnace back in

to reset the board.

“Internal Alarm”. When the control board becomes unresponsive, the control board is in

Internal Alarm. The control board has sensed one of the Safety sensors. This may cause the

furnace to go out. In some cases, after waiting approximately 45 seconds the furnace will

start resonding to the control board again. Many times, the cause of this is a change in the

vacuum inside the Furnace. This may be caused by excessive wind, opening the Firebox door

or opening the Ash Pan door. The control board will monitor the vacuum switch and resume

normal operation if the vacuum returns to normal.

Safety Features

1. ”High Limit” switch”, an overheat safety switch will shut off the fuel feed if the

Furnace reaches temperatures above normal operating temperature. This is a

“Normally Closed” switch and is part of the Fan limit control. If the High limit

switch trips several times, the problem in the Furnace must be diagnosed before