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3. Gas Pressure Requirements
For proper and safe operation, each CFC Series boiler requires a
s t a b l e g a s s u p p l y p r e s s u r e . S e e Tab l e 2 - 3 f o r p r e s s u r e
requirements.
Table 2-3: Model CFC Gas Pressure Requirements
Minimum pressure required at gas train
connection (inches Water Column)
Boiler Model
Natural Gas
500
750
1000
1500
1800
2500
3300*
*Pilot gas pressure CFC 3300: Natural gas 3-5" WC, LP gas 3-4" WC
Actual gas pressure should be measured when the burner is firing
using a manometer at the upstream test port connection on the
main gas valve. For a multiple unit installation, gas pressure should
be set for a single unit first, then the remaining units should be
staged on to ensure that gas supply pressure drop is not more than
1" w.c. and never below the required pressure. Fluctuating gas
pressure readings could be indicative of a faulty supply regulator or
improper gas train size to the boiler. Refer to tables 2-4 through 2-
12 for gas piping recommendations.
To measure pilot gas pressure, use the test port on the pilot solenoid
valve.
Shutoff cock
Regulator
Figure 2-22 Pilot train, CFC-3300
Part No. 750-263
LP Gas
7"
11"
7"
11"
7"
11"
10"
11"
7"
11"
9.5"
11"
6.8"
11"
Max. pressure
28" WC
5 psi
Solenoid valve
Shutoff cock
Section 2 — Installation
Gas Pressure Regulator
Shutoff Valve
Figure 2-21 Gas Regulator and
Shutoff Valve (typical)
NOTE: The pressure test port is
located at the gas valve inlet
flange (see Figure 2-23). The
remaining test cocks are for leak
test purposes and should not be
used to measure gas pressure.
Refer to
APPENDIX D - GAS VALVE
for more information.
2-15
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Troubleshooting
