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106308-05 - 3/23
APEX Installation, Operating, & Service Instructions
Figure 7-7: Gas Inlet Pressure Tap and Pressure Switch Location
C. Pressure Test
See Table 7-6 for Apex Min./Max. Pressure
Ratings. The boiler and its gas connection must
be leak tested before placing boiler in operation.
1. Protect boiler gas control valve. For all testing
over ½ psig (3.4 kPa), boiler and its individual
shutoff valve must be disconnected from gas
supply piping. For testing at ½ psig (3.4 kPa)
or less, isolate boiler from gas supply piping by
closing boiler’s individual manual shutoff valve.
2. Locate leaks using approved combustible gas
non-corrosive leak detector solution.
DANGER
Asphyxiation Hazard.
Do not use matches, candles, open flames or
other ignition source to check for leaks.
D. Apex Models APX525C, APX625C,
APX725C, APX825C (if equipped with
optional low and high gas pressure switches)
1. Verify low and high gas pressure switch
settings are within the range shown in kit
instructions. The switches are preset for natural
gas. For LP gas, the low gas pressure switch
setting must be adjusted.
2. The low gas pressure switch must be reset
after the boiler is piped to the gas supply and
before it is fired.
3. For the low and high gas pressure switches
proper operation, the boiler inlet gas pressure
must be within the range shown in Table 7-6.
4. The gas pressure can be measured at the gas
valve inlet pressure port. Refer to Figure 7-7
“Gas Inlet Pressure Tap and Pressure Switch
Location “.
5. If either pressure switch is tripped, it must
be manually reset before the boiler can be
restarted.
7 Gas Piping (continued)
!
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