Crown Boiler Phantom X series, Installation And Operating Instructions Manual, Page: 75 / 136

75
IX. System Start-up
(continued)
WARNING
Asphyxiation Hazard. The throttle adjustments
shown in Table 37 are approximate. The
final throttle setting must be found using a
combustion analyzer. Leaving the boiler in
operation with a CO air free level in excess of
200 ppm could result in injury or death from
carbon monoxide poisoning.
5. After the burner lights,
complete all steps outlined
in Paragraph O “Perform Combustion Test” before
proceeding.
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 air free) 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.
6. Verify
that the gas inlet pressure is between the
upper and lower limits shown in Table 33 with all
gas appliances (including the converted boiler) both
on and off.
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.
U. Correcting Throttle Screw Mis-Adjustment
(if required)
Phantom X 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.
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 38 for natural gas or Table 39 for LP gas.
3. Follow instructions in Paragraph O
“Perform
Combustion Test” to verify O
2
(or CO
2
) is within the
range specified in Table 35 for natural gas or Table
36 for LP gas at both high fire and low fire.
WARNING
The throttle adjustment values shown in Table 38
and Table 39 are approximate. The final throttle
setting must be found using a combustion
analyzer.
Table 38: Approximate Counter-Clockwise
Throttle Screw Turns from Fully Closed
Position, Natural Gas
Boiler
Model
Approximate
Throttle Screw Turns
PHNTM399C 5¾
PHNTM500C 6½
Table 39: Approximate Counter-Clockwise
Throttle Screw Turns from Fully
Closed Position, LP Gas (Propane)
Boiler
Model
Approximate
Throttle Screw Turns
PHNTM399C 3
PHNTM500C 3½