U.S. Boiler Company Alpine ALP500C, Installation, Operating And Service Instructions

Page: 75 / 144

75
iX. System Start-up
(continued)
2. Test the flow switch
by disabling the primary
loop circulator. The boiler must not start if flow is
not present.
3. Test any other external limits
or other controls
in accordance with the manufacturer’s instructions.
Q. Check Thermostat Operation
Verify that the boiler starts and stops in response to
calls for heat from the heating thermostat and indirect
water heater thermostat. Make sure that the appropriate
circulators also start and stop in response to the
thermostats.
R. Adjust Supply Water Temperature
As shipped, the heating set point supply temperature
is set to 180°F (82.2°C) and, indirect water heater set
point supply temperature is set to 170°F (76.7°C). If
necessary, adjust these to the appropriate settings for
the type of system to which this boiler is connected.
See Section X “Operation” (parameter table on page
97) of this manual for information on how to adjust
supply setpoint.
S. Adjust Thermostats
Adjust the heating and indirect water heater thermostats
to their final set points.
T. Field Conversion From Natural Gas to LP
Gas (Propane)
Alpine models ALP399C and ALP500C are factory
shipped as natural gas builds and can be field converted
to LP gas. Follow steps below for field conversion from
natural gas to LP Gas.
Models ALP600C, ALP700C and ALP800C are factory
shipped as either natural gas build or LP gas build.
Field conversions of models ALP600C, ALP700C and
ALP800C are not permitted.
1. Conversion
of Alpine models ALP399C and
ALP500C from one fuel to another is accomplished
using the throttle screw on the gas valve. Figure 50
“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
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 37.
4. Start the boiler using operating instructions
in Figure 48. After the boiler is powered up with
a call for heat, the boiler should go through the
sequence of operation shown in Table 44. Even if
the gas line has been completely purged of air, it
may take several tries for ignition before a flame
is established. If more than 2 tries for ignition are
needed, it will be necessary to press the reset button
to restart the boiler. If boiler does not light, turn
the throttle screw 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.
Table 37: approximate Clockwise Throttle
Screw Turns for LP gas (Propane)
Conversion
Boiler Model
approximate
Throttle Screw Turns
ALP399C 2¾
ALP500C 3
ALP600C
N/A - Factory LP Builds ALP700C
ALP800C