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Oil Furnace Model Nomenclature Example Model Numbers
H = Highboy D = Downflow
6 = Heat Exchanger Size Identifier
Heating Capacity MBTUH (000's) with factory installed nozzle
Clg. Airflow: Example = 48MBTUH = 4 tons @ 400cfm/ton
Clg. Airflow Variable Speed (ECM) V5 = 5tons
Model Number Digit
O = Oil
F = Front
R = Rear
A = Single Stage
X = 2-Stage
D = Direct Drive
B = Beckett, R = Riello
1
2
3
O D
6
O D
6
O D
6
O D
6
O D
6
O D
6
O
D
6
ii
4
5
6
7
8
9 10 11 12
F
A
0
7
2
D
F
A
0
7
2
D V
R
A
0
7
2
D
R
A
0
7
2
D V
F
X
0
7
2
D V
R
X
0
7
2
D V
F
R
A
X
0
7
2
D
V
4
8
B
5
R
4
8
B
5
R
5
R
5
R
4
8
5
B
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Troubleshooting
