AHRI K2WT, Installation, Operating And Service Instructions

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6) Perform a combustion test, sampling flue products from the tap in the front of the vent adaptor.
7) While the burner is at high fire adjust the throttle as needed to obtain the CO
2
(or O
2
) settings shown in the Table A.3:
• To reduce the CO
2
(increase the O
2
) turn the throttle clockwise
• To increase the CO
2
(reduce the O
2
) turn the throttle counter-clockwise
Make adjustments in increments of 1/8 to 1/4 turn and allow the boiler at least a minute to respond to each adjustment before
making another. In general, the CO level will be at its lowest somewhere in the CO
2
range shown in this table.
8) Verify that the gas inlet pressure is between 11.0 and 14.0 inches w.c. with all gas appliances (including the converted
boiler) both on and off.
9) A sheet of yellow labels is provided in the envelope with this manual for boilers converted from natural to LP gas. Select
the model from this sheet of labels and apply them as follows:
• Apply the “Rating Plate Label” adjacent to the rating plate.
• Apply the “Gas Valve Label” to a conspicuous area on the gas valve.
• Apply the “Boiler Conversion Label” to a conspicuous surface on, or adjacent to, the outer boiler jacket. Fill in the
date of the conversion and the name and address of the company making the conversion with a permanent marker.
10) Refer to the “Start-up and Checkout” section of the boiler installation manual and perform any checks not already
completed.
Model CO
2
Range O
2
Range Max. CO Air Free
080 10. - 10.3 5.6 - 5.3 200
100 10. - 10.3 5.6 - 5.3 200
120 10. - 10.3 5.6 - 5.3 200
150 10. - 10.3 5.6 - 5.3 200
180 10. - 10.3 5.6 - 5.3 200
Appendix A - (continued)
Table A.3: Acceptable Combustion Readings for LP Operation (sea level only)