Cleaver-Brooks ClearFire CFLC-5000 - Gas Pressure Requirements; CFLC Gas Pressure Requirements; Pilot Train

Section 2 — Installation
Part No. 750-363 2-9
2.7.3 Gas Pressure Requirements
For proper and safe operation, each CFLC Series boiler requires a stable gas supply pressure. See table
below for pressure requirements. Refer also to
APPENDIX C - GAS VALVE.
Table 2-5 CFLC gas pressure requirements
*Listed max. pressures are without the use of a step-down regulator. The CFLC can accommodate higher
supply pressures with the addition of an upstream regulator:
CFLC 4000 - 5000 >1/2 psig requires step-down regulator
>5 psig requires overpressure protection
CFLC 6000 - 12000 >2 psig requires step-down regulator
>7 psig requires overpressure protection
When an upstream regulator is installed, required minimum pressures will be higher due to the pressure
drop across the regulator.
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 7" w.c. and never below the required pressure. Fluctuating gas pressure readings could be
indicative of a faulty supply regulator or improper gas train piping to the boiler. Refer to Tables 2-6 and 2-
7 for gas piping recommendations.
To measure pilot gas pressure, use the test port on the pilot solenoid valve.
Gas Supply Pressure (at gas regulator outlet)
Natural Gas 20ppm Natural Gas 9ppm Propane
Boiler
size
Min
(“WC)
Max*
(“WC)
Min
(“WC)
Max*
(“WC)
Min
(“WC)
Max
(“WC)
Gas pilot pressure
(“WC)
4000 9 14 10 14 9 14 3-5
5000 9 14 10 14 9 14 3-5
6000 35 56 35 56 31 56 3-5
8000 35 56 42 56 31 56 3-5
10000 38 56 38 56 35 56 3-5
12000 38 56 40 56 35 56 3-5
Figure 2-4 Pilot train
VALVESOLENOID PILOT
COCKGAS SERVICE
Test Port