Alpine ALP080B - Correcting Throttle Screw Mis-Adjustment

94 103448-07- 1/16
IX. System Start-up (continued)
6. Verify that the gas inlet pressure is between the
upper and lower limits shown in Table 20 on page
72 with all gas appliances (including the converted
boiler) both on and off.
WARNING
Asphyxiation Hazard. These instructions
include a procedure for adjusting the air-fuel
mixture on this boiler. This procedure requires a
combustion analyzer to measure the O
2
(or CO
2
)
and Carbon Monoxide (CO) levels in ue gas.
Adjusting the air-fuel mixture without a proper
combustion analyzer could result in unreliable
boiler operation, personal injury, or death due to
carbon monoxide poisoning.
7. A label sheet is provided with the boiler for
conversions from natural gas to LP gas. Once
conversion is completed, apply labels as follows:
a. Apply the “Rating Plate Label” adjacent to the
rating plate.
b. Apply the “Gas Valve Label” to a conspicuous
area on the gas valve.
c. 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.
S. Correcting Throttle Screw Mis-Adjustment
(if required)
Alpine boilers are re tested at factory and gas valve
throttle screws are preset. However, if boiler does not
start when rst turned on, and, the problem cannot
be remedied following “Help” prompts on the boiler
control display, it may be necessary to reset and
readjust the throttle screw according to the following
instructions.
Boiler
Model
Throttle Position (Number of Counter-
clockwise Turns from Fully Closed Position
ALP080B 6 & 3/4
ALP105B 8 & 1/4
ALP150B 8 & 1/4
ALP210B 9 &1/2
ALP285B 9
Table 25B: Approximate Throttle Screw
Adjustment Values from Fully Closed
Position, LP Gas
Boiler
Model
Throttle Position (Number of Counter-
clockwise Turns from Fully Closed Position
ALP080B 4
ALP105B 4 & 1/4
ALP150B 5
ALP210B 5 & 1/2
ALP285B 4 & 1/2
1. Fully close throttle by turning throttle screw
clockwise until it fully stops.
2. Open throttle screw counter-clockwise the
number of full (360 degrees) and partial turns listed
in Table 25A for natural gas or Table 25B for LP
gas.
3. Follow instructions in Section L “Perform
Combustion Test” to verify O
2
(or CO
2
) is within the
range specied in Table 22 for natural gas or Table
23 for LP gas at both high re and low re.
WARNING
The throttle adjustment values shown in Table
25A and Table 25B are approximate. The
nal throttle setting must be found using a
combustion analyzer.
WARNING
Asphyxiation Hazard. 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 deciency. Operating the boiler in this
condition may cause property damage, personal injury or loss of life.
At 0% excess air the CO
2
readings will be either 11.9% CO
2
for natural gas or 13.8% CO
2
for LP gas (O
2
will
be 0%) and CO level will be extremely high (well over 1000 PPM).
If the burner operates with air deciency, the following phenomena may be observed:
% CO
2
will actually drop (% O
2
will increase) as the throttle is turned counter-clockwise
% CO
2
will actually increase (% O
2
will drop) as the throttle is turned clockwise
If the boiler appears to operate with air deciency, shut down the boiler and follow instructions in Paragraph
S “Correcting Throttle Screws Mis-Adjustment. Then, use a combustion analyzer to verify and adjust O
2
(or
CO
2
) and CO to values shown in Table 22 for natural gas or Table 23 for LP gas.
Table 25A: Approximate Throttle Screw
Adjustment Values from Fully Closed
Position, Natural Gas