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Upflow/Horizontal Furnace Models
4
3
5
8
7
18
9
13
15
1 Igniter (Not Shown)
2 Flame Sensor (Not Shown)
3 Gas Valve
4 Flame Roll-out Switch(s)
5 Condensate Pressure Switch
6 Pressure Switch
7 Control Board
8 Add On Board
9 Blower Door
Switch
10 Vent Safety Switch
11 Low Voltage
Transformer
12 Supply Air Limit
Switch
Figure 26. Location of Major Components
17
2
1
13 Circulating Air
Blower Assembly-
14 Induced Draft
Blower
15 Condensate Drain Tube
(Not Shown)
16 In-Line Drain
Assembly
17 Burner View Port
18 Front Header Box
19 Combustion Air
Intake (Not Shown)
20 Exhaust Vent
21 Variable Speed Blower Kit
22 Gas Manifold Assembly
23 Burner Box Assembly
20
23
22
12
6
16
11
10
14
21
33
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