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Upflow
Furnace
Models
1 igniter (Not Shown)
2 Flame Sensor (Not
Shown)
3 Gas Valve
4 Flame Boll-out
Switch(s)
5 Pressure Switch
6 Vent Pressure
Switch
(Not Shown)
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 BurnerView
Port
17 Front Header Box
18 Combustion
Air
intake
19 Exhaust Vent
@
Downflow
Furnace
Models
1 igniter (Not Shown)
2 Flame Sensor (Not
Shown)
3 Gas Valve
4 Flame Floll-out
Switch(s)
5 Pressure Switch
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 BurnerView
Port
17 Front Header Box
18 Combustion
Air
intake
19 E×haust Vent
@
Figure 30. Location
of Major Components
37
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