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