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9
System Start-up
3. Once a system is cleaned, use of an inhibitor
is also recommended such as the following or an
equivalent:
· Fernox F1 Protector
· Sentinel X100 Inhibitor
Follow the manufactures instructions for proper
dosage, use. For long-term protection ensure
concentration levels are maintained and checked
annually as part of the boiler or system service.
4. Boiler system water should meet the following
criteria. pH between 7.5 and 9.5.
If system contains aluminum components, pH
must be less than 8.5.
Chlorides< 50 ppm.
Total Dissolved Solids - less than 2500 PPM.
Hardness - 3 to 9 grains/gallon.
Pressurize the system to at least 14.5 psi (100
kPa). Purge air from the system. A manual air vent
is located on the right side of the heat exchanger.
!
WARNING
Burn Hazard.
The maximum operating pressure of this boiler
is 30 psig (210 kPa), 50 psig (340 kPa), 60
psig (410 kPa), 80 psig (550 kPa) or 100 psig
(689 kPa) depending on the model and safety
relief valve option selected. Never exceed the
maximum allowable working pressure on the
heat exchanger ASME plate.
E. Confirm that the Boiler and System
Have No Water Leaks
NOTICE: If it is required to perform a long term
pressure test of the hydronic system, the boiler
should first be isolated to avoid a pressure loss
due to the escape of air trapped in the boiler.
To perform a long term pressure test including the
boiler, ALL trapped air must first be removed from
the boiler.
A loss of pressure during such a test, with no
visible water leakage, is an indication that the
boiler contained trapped air.
106308-05 - 3/23
(continued)
APEX
Installation, Operating, & Service Instructions
F. Check all Gas Piping for Leaks
piping sections that are filled with air. Refer to
National Fuel Gas Code, ANSI Z223.1/NFPA 54 or,
in Canada, Natural Gas and Propane Installation
Code, CAN/CSA B149.1.
!
DANGER
Explosion Hazard.
Do not use matches, candles, open flames or
other ignition source to check for leaks.
Make sure that the area around the boiler is clear
and free from combustible materials, gasoline
and other flammable vapors and liquids.
G. Confirm Vent System is Complete
free of obstructions before attempting to fire boiler.
H. Inspect all Wiring
miswired connections.
I. If Boiler is to be Converted to LP Gas
(propane),
convert as described in Part T of
this section of the manual. Only models APX425C
and APX525C can be converted to LP gas.
Models APX625C, APX725C and APX825C are
factory built for LP gas and cannot be converted.
J. If Boiler is Operating at Elevations
Above 2,000 ft.
, see Appendix A for setup
instructions.
K. Start Boiler Using Operating
Instructions
in Figure 9-1. After the boiler is
powered up with a call for heat, the boiler should
go through the sequence of operation shown in
Table 10-11.
and purge
and
for loose, uninsulated, or
69
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