71
106308-05 - 3/23
APEX Installation, Operating, & Service Instructions APEX Installation, Operating, & Service Instructions
L. Upon Initial Start-up, Gas Train Will be
Filled with Air
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. Once a
flame has been established for the first time,
subsequent calls for burner operation should
result in a flame on the first try.
M. Check Burner Flame
Inspect the flame visible through the window. On
high fire the flame should be stable and mostly
blue (Figure 9-4). No yellow tipping should be
present; however, intermittent flecks of yellow and
orange in the flame are normal.
N. Check Gas Inlet Pressure
Check the inlet pressure and adjust if necessary.
Verify that the inlet pressure is between the upper
and lower limits shown on the rating plate with all
gas appliances on and off.
WARNING
Asphyxiation Hazard.
The outlet pressure for the gas valve has been
factory set and requires no field adjustment.
This setting is satisfactory for both natural gas
and propane. Attempting to adjust the outlet
pressure may result in damage to the gas valve
and cause property damage, personal injury or
death.
O. Perform Combustion Test
WARNING
Asphyxiation Hazard.
Each Apex Series boiler is tested at the factory
and adjustments to the air fuel mixture are
normally not necessary. Improper gas valve or
mixture adjustments could result in property
damage, personal injury or death.
WARNING
Any gas valve adjustments (throttle and/
or offset) specified herein and subsequent
combustion data (%O
2
, %CO
2
, CO air free ppm)
collection must be performed using a calibrated
combustion analyzer.
Failure to use combustion analyzer could result
in property damage, personal injury or death.
1. Use a combustion analyzer to sample boiler
flue gas and measure O
2
(or CO
2
) and CO air
free. Boilers are equipped with a screw cap in
the vent connector. Be sure to replace this cap
when combustion testing complete.
2. Verify O
2
(or CO
2
) and CO air free are within
limits specified in Table 9-2 for natural gas or
Table 9-3 for LP gas (propane). Note: Tables
9-2 and 9-3 are for sea level only. For altitudes
above 2,000 ft., see Appendix A.
a. Lock boiler in high fire and allow fan
speed and combustion analyzer reading
to stabilize before taking combustion
readings. To lock boiler in high fire, select
MAIN MENU >> OPERATION. Select
lock symbol, type password “86” and
select ENTER. From the Operation screen,
select Automatic / Manual Firing Rate
Control >>Manual Modulation. Go back to
Operation screen. Then select High Low >>
High.
Boiler
Model
CO
2
% O
2
%
CO air free
(PPM)
APX425C 8.6 - 9.2 4.7 - 5.8
Less than
200 PPM
APX525C 8.7 - 9.2 4.7 - 5.6
APX625C 8.6 - 9.2 4.7 - 5.6
APX725C 8.2 - 8.9 5.2 - 6.5
APX825C 8.2 - 9.1 4.9 - 6.5
Table 9-2: Natural Gas Typical Combustion
Readings (Sea level Only)
Table 9-3: LP Gas (Propane) Typical Combustion
Readings (Sea Level Only)
Boiler
Model
CO
2
% O
2
%
CO air free
(PPM)
APX425C 9.4 - 10.2 5.4 - 6.6
Less than
200 PPM
APX525C 9.8 - 10.2 5.4 - 6.0
APX625C 9.4 - 10.2 5.4 - 6.6
APX725C 9.7 - 10.0 5.7 - 6.2
APX825C 9.4 - 10.2 5.4 - 6.6
9 System Start-up (continued)
!
!
!
To Next Page
Loading...
