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Burner Pressure Adjustment – All Models
Check Combustion Natural Gas
1. Measure input. English units turn off gas to all other appliances.
• Activate some heating zones to dissipate heat
• Set boiler on high fire
• Use ½, 1 or 2 cu ft dial on gas meter. Measure time required for one
or more complete revolutions. Measure time for 1-2 minutes.
• Calculate input.
Input (MBH) =
Example: Gas flow from
Meter = 2 cu ft
Measured time = 72 seconds
Rate (MBH) = 3600 x 2 cu ft
Quantity of Orifice's
CCB150 = 17
CHB100 = 11
CHB130 = 15
NG Orifice size 1.35mm
LP Orifice size 0.85mm
3600 x ____ cu ft
_____ seconds
=
100 MBH
72 seconds
Test Ports
Vent Gases
Test Port
Combustion Minimum / Maximum
Max. input
Min. input
Combustion Air
Test Port
Natural Gas
C02 at (100%)
7.3 – 7.8
C02 at (33%)
4.6 – 5.4
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