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6
1 Ignitor
2 Flame Sensor
3 Gas Valve
4 Flame Roll-out
Switch(s)
5 Pressure Switch
6 Control Board
7 Blower Door
Switch
8 Vent Assembly
9 Low Voltage
Transformer
10 Burner Assembly
11 Supply Air Limit
Switch
12 Blower Assembly
13 Induced Draft
Blower
Upflow/Horizontal Furnace
80+ AFUE Two - Stage Models
2
5
7
6
3
9
4
1
10
11
13
12
8
Figure 4. Furnace Parts Identified