M3 Downflow Furnace
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| 21 |
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| 18 |
| 8 |
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| 19 |
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| 22 |
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| 13 |
| 17 |
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| 14 |
| 1 |
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| 15 |
1 | Door Assembly - Louvered | 12 | Ignitor Assembly |
2 | Filter Inside Door | 13 | Burner View Port |
3 | Blower Assembly | 14 | Main Limit Switch |
4 | Control Board | 15 | Coil Cabinet Assembly (Optional) |
5 | Pressure Switch | 16 | Flame Sensor (On Burner Box) |
6 | Flame Rollout Switch | 17 | Gas Valve |
7 | “J” Trap Hard Tube | 18 | Switch, On/Off |
8 | Low Voltage Transformer | 19 | Blower, Inducer |
9 | In Line Drain Assembly | 20 | Orifice (In Burner Box) |
10 | Junction Box | 21 | Aux. Limit |
11 | Vent Safety Switch | 22 | Burner Box |
Figure 29. Location of Major Components
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