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This addendum covers the SCF-050 Multi-Fuel Add-On Furnace heating system.

Please read through Section B of the St Croix Service Manual that covers the

Multi-Fuel Burn System. The design of this furnace is based on the Freestanding

St Croix stoves.

The Electrical Components of this furnace are the same as those shown in section B

with the following exceptions:

1 - This furnace has a different control board.

2 – The Furnace has a 600-800 CFM Convection Blower

3 –The Furnace has a Fan/Limit Control, which has a dual function. It controls the

Room Air Blower and also acts as the High Limit Switch to shut the unit down if

temperatures rise above 200 Degrees F. in the Plenum area.

Control Board Features

The Control Board functions slightly differently that the

freestanding stove versions. Please read the following de-

scription of the Control Board.

a. General Operation of the Furnace.

b. Safety Features, to shut the unit down in the

event the sensors detect a problem in the unit.

The Control Board also has Diagnostic Capabilities to

help in diagnosing 3 areas in the furnace. These areas are:

1. High Temperature Limit.

2. Proof of Fire Sensor

3. Vacuum in the Firebox

A closer look at the Control Board to the right in figure 1

will explain how the board works. There are five buttons

labeled 1 through 5, a slide switch labeled 6 and a LED

Light bar with 5 Heat Settings. The LED Light bar is also

used during the Diagnostic process, see page 80 for

more details on Diagnostic Features.

The buttons on the board function as follows: (Refer to

Figure 1. The touch pad buttons are labeled with the

white numbers 1 through 5)

1. The Heat Level button (1) will advance the setting

between level 1 and 5. Once you reach level 5, it will drop

back to level 1. Each level has a LED light to indicate

where the board is set.

Figure 1

The newsletter for Technical and Warranty issues

SCF-050 Service Manual Addendum

1/5/10

Cover Story

SCF-050 Service Manual

Addendum

Control Board Features

How is it different from the

stove version?

Pages 1-2

SCF-050 Troubleshooting

Flow Charts

Pages 3-5

Fan/Limit Control

-Replacement

Feed Rate Adjustments

Wiring Schematic

Parts Layout

Pages 8-10

SCF-050 Data Table

Inside this issue:

TechNet

Manufactured and Distributed by Even Temp, Inc.

Summary of content (11 pages)

PAGE 1
TechNet Manufactured and Distributed by Even Temp, Inc. The newsletter for Technical and Warranty issues SCF-050 Service Manual Addendum Inside this issue: This addendum covers the SCF-050 Multi-Fuel Add-On Furnace heating system. Please read through Section B of the St Croix Service Manual that covers the Multi-Fuel Burn System. The design of this furnace is based on the Freestanding St Croix stoves.
PAGE 2
. The On/Off button (2) turns the Furnace On and Off. It will also reset the board after the board has sensed a problem and is flashing a Diagnostic code. 3. The Auger button (3) will allow the customer to manually auger fuel into the burn pot on start up when needed. This is particularly helpful in priming the Auger Tube when it is empty. 4. The Draft Trim button (4) allows for adjusting the Exhaust fan voltage on Heat Level 1 only.
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Troubleshooting Flow Charts for the SCF-050 The Trouble shooting Flow Charts for the following components will be referenced from Section B of this Service Manual to eliminate duplicating the charts: Digital Control Board Please refer to page 100 of the original Digital Control Board Service Manual. Combustion Blower Please refer to page 103 of the original Digital Control Board Service Manual. Vacuum Switch Please refer to page 103 of the original Digital Control Board Service Manual.
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Fan/Limit Control The Fan/Limit Control shuts the furnace down in an Over-Temp situation. This usually involves the room air fan. The fan may be defective or the fan may need cleaning. If the squirrel cage becomes dirty, they can’t move enough air to keep the furnace cool enough when running on the higher settings. If the High Limit trips more than once a closer look should be given to Convection Blower of the furnace.
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Auger Motor - Electrical Remember: Checking for Voltage either at the Harness or directly at the Pin-Out of the control board can only be done when the Auger should be running. The auger runs for 2 minutes during the Start-Up Cycle or runs at a #1 level 5 minutes after the stove is first turned on. Hot-wiring the fan direct with a power cord is also a good way to check the Auger motor.
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Fan/Limit Control - Replacement Before installing the new Fan/Limit Control, be sure to remove the BreakAway tab between the left and right wiring circuits. See figure 6 to the left. After replacing the Fan/Limit Control, remember to adjust the Fan ON and the Fan OFF settings. Failure to adjust these settings may cause the Blower to short cycle. Figure 6 Feed Rate Adjustment The Default Cycle Time is 10.0 seconds. Please see figure 7 to the left. The 10.0-second cycle can be changed to 8.
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SCF-050 Wiring Schematic The Electrical Rating of this furnace is: 120 Volt, 60 Hz, 4 AMP. The minimum recommended circuit is 15 Amp. A dedicated circuit for the furnace is recommended.
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SCF-050 Parts Lay-out -8-
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# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 PART NUMBER 80P53707-R 80P53677-R 80P53797-R 80P20132-R 80P53798-R 80P30162-R 80P52592-R 80P53623-R 80P52568-R 80P53619-R 80P2001-R 80P30144-R 80P30089-R 80P30102-R 80P30085-R 80P53835-R 80P30207-R 80P30045-R 80P30205-R 80P30147-R 80P30169-R 80P53813-R 54995K24-R 80P30658-R 80P20168-R 80P52237-R 80P53836 -R 80P53810-R 80P30168-R 80P53843-R 80P30092-R 80P30151-R 80P30206-R 80P30090
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# 46 47 48 49 50 51 52 53 54 PART NUMBER 80P20038-R 80P52630-R 80P52957-R 80P20248-R 80P20278-R 80P30191-R 80P20245-R 80P50858-R 80P53807-R DESCRIPTION PROOF OF FIRE SWITCH TERMINAL BLOCK MOTOR MOUNT BRACKET ASSEMBLY 5/8” COLLAR W/ SETSCREW AUGER MOTOR MOTOR RETAINER BRACKET AUGER GASKET AUGER BUSHING WASHER AUGER WELDMENT - 10 -
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SCF-050 Data Table Based on a default Cycle Time of 10.0 seconds. Cycle time equals the ON time & OFF Time combined. Heat Level Selection Auger ON (Seconds) Combustion Fan Voltage +/- 10% Convection Fan Voltage +/- 10% Corn Fuel (Lbs./Hour) +/- 10% Start-Up Cycle Off for the first 5 minutes 100 Volts OFF NA 1 2.5 90 Volts 120 Volts 2.0 Lbs. 2 3.0 98 Volts 120 Volts 2.75 Lbs. 3 3.5 105 volts 120 Volts 3.5 Lbs 4 4.0 111 volts 120 Volts 4.35 Lbs. 5 4.5 120 volts 120 Volts 5.