Burnham K2WTC - Page 99

99
107774-01- 9/17
Table 12.5A: Typical Natural Gas Combustion Readings (Sea Level Only)
Boiler Size
Measured High Fire %O
2
**
Maximum CO Air-Free
Range Target
135
4.7-5.6 4.9 200ppm150
180
** Low Fire Range and Target values are the same as High Fire above. Ensure low re O
2
reading is greater
than or equal to high re O
2
reading.
Boiler Size
Measured High Fire %CO
2
*
Maximum CO Air-Free
Range Target
135
8.7-9.2 9.1 200ppm150
180
* Low Fire Range and Target values are the same as High Fire above. Ensure low re CO
2
reading is less
than or equal to high re CO
2
reading.
NOTICE
This boiler has a limited warranty, a copy of which is included with this boiler. It is the responsibility of
the installing contractor to see that all controls are correctly installed and are operating properly when the
installation is complete.
Model # Counter-clockwise Turns (From Fully
Closed)
135 12-1/4
150 10
180 15
Table 12.5B: Starting Number of Throttle Turns for Natural Gas
XII. Start-Up and Checkout (continued)
NOTICE
In some cases, such as when the gas valve is replaced, the throttle may be far enough out of adjustment
that it is not possible to re the boiler while “dialing in” the CO
2
(or O
2
) using a combustion analyzer. In
such a case, do the following:
1) Turn the throttle screw clockwise until it stops turning.
2) For natural gas applications, turn the throttle screw counter-clockwise by the number of turns shown
in Figure 12.5B.
3) For LP gas applications set the preliminary throttle setting per conversion kit instructions.
4) Start the boiler using the lighting instructions on Page 100.
5) Once the boiler is ring, use a combustion analyzer to adjust the CO
2
(or O
2
) to its nal value as
described above.