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General Information
Quantity of
Vent Size
(in.)
Model
No.
Burners
Gas
Valves
Blowers Flue Intake
302B 6 1 1 5 6
402B 8 1 1 6 6
502B 10 2 1 6 6
652B 13 2 1 8 6
752B 15 2 1 8 6
902B 18 3 1 8 6
# Burners per
Valve
Stages
% Fire at
Stage
Model
No.
12312 12
302B 6
1 100
402B 8 1 100
502B 5 5 11, 250100
652B 7 6 11,254100
752B 8 7 11,253100
902B 6 6 6 1, 2 1, 2, 3 66 100
Table A: Basic Data
Table B: Manifold Data
# Burners
per Valve
Valve
Staging
% Firing
at Stage
Model
No.
12*1 2 1 2
302B 4 2 1 1, 2 66 100
402B 5 3 1 1, 2 63 100
Table C: 2-Stage Design Option
* Valve 2 is inside the air plenum on H3/WH3 302B-402B