Installation Manual

90
4. Before attempting to start the boiler, make the
number of turns to the throttle screw called for in
Table 24.
5. Attempt to start the boiler using the lighting
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.
6. After the burner lights, force the burner to high
re. Allow the boiler to operate for approximately 5
minutes before taking combustion readings.
Figure 53: Dungs Gas Valve Detail
Table 24: Number of Clockwise Throttle Screw
Turns for LP Conversion
Boiler Model Gas Valve
Throttle Screw Turns at
Altitude Range
0 - 7000 Ft.
ALP080
Dungs
GB-055
(½” NPT)
2¾
ALP105 4
ALP150 3¼
ALP210 4
ALP285
Dungs
GB-057
(¾” NPT)
4½
ALP399
Dungs
GB-057 HO
(¾” NPT)
1¾
ALP500 1
WARNING
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 25 could result in injury or death from carbon monoxide poisoning.
XI. System Start-up (continued)