14
B) Burner Adjustments
Allow the burner to operate steadily for at least 15 minutes. Check the burner settings according to the
installer/serviceman labels starting on page 24, and make the following adjustments:
When servicing this appliance or any forced draft unit, it is important to properly seal the gasketed
areas around the flue collector and burner mounting flange. Check to be sure that the sampling port
above the burner has had the port plug installed after servicing.
NOTE: A Draft regulator
is an integral part of the flue collector located behind the front jacket panel.
Units shipped from the factory without the draft regulator installed, but shipped with a blank plate will
have the draft regulator packed in the miscellaneous parts box.
The CWL-Series is a forced draft boiler and requires a positive pressure over the fire. If chim-
ney draft causes the overfire draft to become negative, the draft regulator must
be installed. The over-
fire draft must not be less than +.005 (positive).
Combustion Analysis of Boiler with Rear Vent Kit
When a rear flue unit with a draft regulator is used, flue gas sampling must either be taken by
inserting the CO2 probe or the smoke tester probe down into a fire tube. You can also take flue gas
sampling from the sight fitting/sampling port above the burner. If using the sampling port, do not insert
the probe into the combustion area too far. Insert probe approximately 1/2” to 1”. Excessive insertion
may cause false readings.
Combustion readings should not be taken through the draft regulator or through a sampling hole
in the breaching on Rear Flue
units. The gases become diluted as a result of room air being brought in
through the built-in draft regulator and are inaccurate.
Figure 4 - Test Location for Boiler with Rear Vent Kit
1. Sampling Hole - punch 1/4" hole in the flue between the flue box and the draft regulator. All test read-
ings should be taken from this point.
2. In The Stack Draft - Take a draft reading from the flue pipe sampling hole. Adjust the barometric draft
regulator to -.02" in the stack. In tall chimneys a second draft regulator may be required in the flue pipe
to regulate draft under high draft conditions.
3. Overfire Draft - Take a draft reading from the draft port located to the left of the burner. Compare the
readings with those according to the installer/serviceman labels for starting on page 24. Reinstall the
draft port plug after all readings have been taken.
1 NOTE: INTEGRAL PART OF FLUE COL LEC TOR LOCATED
BEHIND JACKET PANEL.
Sample Location
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