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9
System Start-up
!
WARNING
Asphyxiation Hazard.
The throttle adjustments shown in Table 9-6 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
(or CO
2
(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 7-6 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)
Apex 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.
74
(continued)
) and Carbon Monoxide
2
APEX
Installation, Operating, & Service 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 9-7 for natural gas or Table 9-8
for LP gas.
3. Follow instructions in Paragraph O "Perform
Combustion Test" to verify O
the range specified in Table 9-2 for natural gas
or Table 9-3 for LP gas at both high fire and low
fire.
!
WARNING
The throttle adjustment values shown in Table
9-7 and Table 9-8 are approximate. The
final throttle setting must be found using a
combustion analyzer.
Table 9-7: Approximate Counter-Clockwise
Throttle Screw Turns from Fully Closed
Position, Natural Gas
Boiler
Model
Throttle Screw Turns
APX425C
APX525C
APX625C
APX725C
APX825C
Table 9-8: Approximate Counter-Clockwise
Throttle Screw Turns from Fully
Closed Position, LP Gas (Propane)
Boiler
Model
Throttle Screw Turns
APX425C
APX525C
APX625C
APX725C
APX825C
(or CO
) is within
2
2
Approximate
5¾
6½
6½
10½
11
Approximate
3
3½
8
12
8½
106308-05 - 3/23
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