7
EN
Furnaces
AF/DF Series
DF M D 30 1 1 1
Rate Stages
Door Style
Type of Gas
BTU/hr Rating Model number example: DFMD30111
Voltage
Cabinet Size
Furnace Type
Furnace
Type
Cabinet
Size
Voltage BTU Rating
Type of
Gas
Door Style
Rate
Stages
DF = Dometic
Furnace S = Small
DC =
DC Voltage 12 = 12,000 35 = 35,000 1 = LP Gas
1 = Door 1 = Single
AF = Atwood
Furnace
SA = Small
Low Amps
(for small
furnaces
only)
AC =
AC Voltage 16 = 16,000 40 = 40,000
2 = LP or
Natural Gas
2 = No Door
20 = 20,000
3 = Door w/Rear Gas
Fitting
M = Medium 25 = 25,000
4 = Door w/
Connector
L = Large 30 = 30,000
5 = Door w/Rear Gas
Fitting & Connector
79/80, 85, 89 Series
85 35 DC LP IV
Version
Type of Gas
Voltage Model number example: 85-35 DCLP IV
BTU/hr Rating
Furnace Type
Furnace Type BTU Rating Voltage Type of Gas Version
79 = 7900 Series 12 = 12,000 31 = 31,000 DC = DC Voltage LP = LP Gas (no #) = Version 1
80 = 8000 Series 16 = 16,000 35 = 34,000 AC = AC Voltage LP/NAT = LP or Natural Gas II = Version 2
85 = 8500 Series 20 = 20,000 40 = 40,000 III = Version 3
89 = 8900 Series 25 = 25,000 IV = Version 4
85/89 Series Two-Stage
1522 DC LP
Type of Gas Model number example: 1522 DC LP
Voltage
Model
Model BTU Rating (low) BTU Rating (high) Voltage Type of Gas
1522 15,000 22,000 DC = DC Voltage LP = LP Gas
2334 23,000 34,000
2540 25,000 40,000