AHRI APEX, Installation, Operating And Service Instructions

Page: 72 / 124

72
IX. System Start-up
(continued)
Table 23: Approximate Number of Clockwise
Throttle Screw Turns for LP Conversion
WARNING
Explosion Hazard. Asphyxiation Hazard.
This conversion should be performed by a
qualified 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 fire, an
explosion or production of carbon monoxide
may result causing property damage, personal
injury, or loss of life. The qualified 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 specified 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 23.
WARNING
Asphyxiation Hazard. The throttle adjustments
shown in Table 23 are approximate. The
final 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 22 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.
6. Verify
that the gas inlet pressure is between the upper
and lower limits shown in Table 19 on page 53 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 flue 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 fire tested at factory and gas valve
throttle screws are preset. However, if boiler does not
start when first 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
Gas Valve
Approximate Throttle
Screw Turns
APX425
GB-057 HO
(¾” NPT)
1¾
APX525
GB-057 HO
(¾” NPT)
1
APX625
GB-ND057 D01 S00 XP
(¾” NPT)
Factory LP Builds APX725
APX825
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 first
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.