90+ AFUE
10
18 | 19 |
| |
4 |
| ||
16 | 7 | ||
| |||
1 |
| ||
| 8 | ||
6 | 2 | ||
| |||
3 | 11 | 5 | |
5 | |||
15 |
| ||
7 | 10 | 13 | |
| |||
| 13 | ||
17 | 9 | ||
| 9 | 14 | |
|
| ||
8 | 12 | 11 | |
3 | |||
|
|
1
14
4
19
18
12
15
17
2
16
Upflow/Horizontal Condensing Furnaces | Downflow Condensing Furnace |
1 | Ignitor (Not Shown) | 8 | Blower Door Switch | 14 | Condensate Drain |
2 | Flame Sensor (Not | 9 | Vent Safety Switch |
| Tube |
| Shown) | 10 | Low Voltage | 15 | |
3 | Gas Valve |
| Transformer |
| Assembly |
4 | Flame | 11 | Supply AIr Limit | 16 | Burner View Port |
| Switch(s) |
| Switch | 17 | Front Header Box |
5 | Pressure Switch | 12 | Circulating Air | 18 | Combustion Air |
6 | Vent Pressure |
| Blower Assembly |
| Intake |
| Switch (93+ Only) | 13 | Induced Draft | 19 | Exhaust Vent |
7 | Control Board |
| Blower |
|
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|
|
|
|
|
|
Figure 2. Furnace Parts Identified
4
