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