Burnham Water boiler Installation, Operating And Service Instructions page 91

Xi. System Start-up (continued)
7. Perform a combustion test. Refer to Paragraph K
above for details.
8. While the burner is at high fire adjust the throttle as
needed to obtain the CO
the Table 25:
• To reduce the CO
throttle clockwise
Table 25: Recommended Combustion Settings,
LP gas
Boiler
Model
% CO
2
ALP080
ALP105
10.1 - 8.5
ALP150
(High Fire)
ALP210
11.6 - 7.7
ALP285
(Low Fire)
ALP399
ALP500
if the throttle is very far out of adjustment on the "rich" (counter-clockwise) side, the boiler burner may be
running at 0% Excess Air or even with air deficiency.
at 0% Excess air the CO
be 0%) and CO level will be extremely high (well over 1000 PPM).
If the burner operates with air deficiency, the following phenomena may be observed:
% CO will actually drop (% O
2
% CO will actually increase (% O
2
If the boiler appears to operate with air deficiency, turn the throttle clockwise to increase the amount of
Excess air to the burner.
as the throttle is turned clockwise, the CO
of the type of gas being used, before falling (conversely, O
happens, continue turning the throttle clockwise, until CO
shown in Table 2 or Table 25.
The pressure regulator has been factory set using precision instruments and must never be adjusted in
the field. The gas valve outlet pressure is the same for both natural gas and propane. Make sure that
all adjustments are made with the throttle, not the pressure regulator. attempting to adjust the pressure
regulator will result in damage to the gas valve and may cause property damage, personal injury or loss of
life.
(or O ) settings shown in
2 2
(increase the O ) turn the
2 2
Altitude Range
0 - 7000 Ft.
% O Range CO, PPM
2
5.6 - 8.0
(High Fire)
Less than
100 PPM
3.2 - 9.2
(Low Fire)
readings will be either 11.9% CO
2
will increase) as the throttle is turned counterclockwise
2
will drop) as the throttle is turned clockwise
2
level will rise, eventually peaking @ 11.8% or 1.8%, depending
2
• To increase the CO
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 range shown in this table.
2
9. Verify that the gas inlet pressure is between the
upper and lower limits shown in Table 17 with all
gas appliances (including the converted boiler) both
on and off.
10. A label sheet is provided with the boiler for
conversions from natural to LP gas. Once conversion
is completed, apply labels 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.
nOTiCE
for natural gas or 1.8% CO
2
level will drop to 0% before rising). after this
2
level drops (or O
2
WaRning
(reduce the O ) turn the
2 2
for LP gas (O
2
level increases) to the values
2
will
2
91