103448-07 - 1/16 93
Table 24: Number of Clockwise Throttle
Screw Turns for LP Conversion
Boiler Model Gas Valve
Throttle Screw Turns at
Altitude Range
0 - 7000 Ft.
ALP080B
Dungs
GB-055
(½” NPT)
2¾
ALP105B 4
ALP150B 3¼
ALP210B 4
ALP285B
Dungs
GB-057
(¾” NPT)
4½
IX. System Start-up (continued)
R. Field Conversion From Natural Gas to LP
Gas
Alpine models ALP080 through ALP285 (-02, 27, 07
altitude code builds.) are factory shipped as natural gas
builds and can be eld converted to LP gas. Alpine
models ALP150, ALP210 and ALP285 (-70 altitude
code builds) are factory shipped as natural gas builds
but are not permitted to be eld converted to LP gas.
Follow steps below for eld conversion from natural
gas to LP Gas.
1. Conversion of Alpine models ALP080B through
ALP285B (-02, 27, 07 altitude code builds) from
one fuel to another is accomplished using the
throttle screw on the gas valve. Figure 37 “Gas
Valve Detail” shows the location of the throttle
screw on the valve. Locate the throttle screw on the
boiler being converted.
WARNING
Explosion Hazard. Asphyxiation Hazard.
This conversion should be performed by a
qualied service agency in accordance with the
manufacturer’s instructions and all applicable
codes and requirements of the authority
having jurisdiction. If the information in these
instructions is not followed exactly, a re, an
explosion or production of carbon monoxide
may result causing property damage, personal
injury, or loss of life. The qualied service
agency is responsible for proper conversion of
these boilers. The conversion is not proper and
complete until the operation of the converted
appliance is checked as specied in this manual.
2. If conversion is being made on a new
installation, install the boiler in accordance
with the installation instructions supplied with the
boiler. If an installed boiler is being converted,
connect the new gas supply to the boiler, check for
gas leaks, and purge the gas line up to the boiler
in accordance with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 and/or Natural Gas and
Propane Installation Code, CAN/CSA B149.1 or the
requirements of the authority having jurisdiction.
3. Before attempting to start the boiler, make the
number of turns to the throttle screw called for in
Table 24.
4. Attempt to start the boiler using the Operating
Instructions located inside the lower front cover of
the boiler. If the boiler does not light on the rst
try for ignition, allow to boiler to make at least
four more attempts to light. If boiler still does not
light, turn the throttle counter clockwise in 1/4 turn
increments, allowing the boiler to make at least
three tries for ignition at each setting, until the boiler
lights.
WARNING
Asphyxiation Hazard. The throttle adjustments
shown in Table 24 are approximate. The
nal throttle setting must be found using a
combustion analyzer. Leaving the boiler in
operation with a CO level in excess of the value
shown in Table 23 could result in injury or death
from carbon monoxide poisoning.
5. After the burner lights, complete all steps
outlined in Paragraph L “Perform Combustion Test”
and Paragraph M “Checking/Adjusting Gas Input
Rate” before proceeding.
Figure 37: Dungs Gas Valve Detail
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