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