Nordyne Residential Gas Furnaces 90+ AFUE Two - Stage Models, 20 19 7, Downflow Furnace Models

90+ AFUE Two - Stage Models

	20
5	17	11
		8
7	12	9
3	4
6
	16
8
11		14
	14
18
9	10	10
		4
		12
13		3
15		5
		15

Upflow/Horizontal Furnace Models

20

19

7

16

6

18

17

Downflow Furnace Models

1	Ignitor (Not Shown)	10	Vent Safety Switch	16	In-Line Drain
2	Flame Sensor (Not	11	Low Voltage		Assembly
	Shown)		Transformer	17	Burner View Port
3	Primary Gas Valve	12	Supply Air Limit Switch	18	Front Header Box
4	Secondary Gas Valve	13	Circulating Air Blower	19	Combustion Air
5	Flame Roll-out Switch(s)		Assembly (Not Shown		Intake (Not Shown
6	Pressure Switch		on Downflow Model)		on Upflow Model))
7	Vent Pressure Switch	14	Induced Draft Blower	20	Exhaust Vent
8	Control Board	15	Condensate Drain		(Not Shown on
9	Blower Door Switch		Tube		Downflow Model)

Figure 3. Furnace Parts Identified

5