Cleaver-Brooks ClearFire CFLC-5000 - Low Water Cutoff Check; Low and High Fire Adjustments; Modulation off Point; Gas Valve Adjustments

Section 4 — Commissioning
4-14 Part No. 750-363
4.10.5 Low Water Cutoff Check
1. Hold down the LOW WATER RESET-TEST switch for 3 seconds.
2. Check Annunciation screen. The ILK section (Interlock circuit) should show A3 LOW WATER: OFF
3. Press RESET-TEST switch once to reset.
4.10.6 Low and High Fire Adjustments
All CFLC boilers are factory tested firing natural gas at an altitude of 1000 ft ASL. Operating under different
conditions may require re-adjustment of the gas valve. See figure below for low and high fire adjusting screw
locations. Observe the markings on the gas valve to ensure correct direction of adjustment.
Refer to Appendix A for further information on gas valve setup, operation, and testing.
4.10.7 Modulation OFF point
Prior to setting combustion, the Modulation OFF point should be adjusted upward to avoid nuisance
shutdowns while the burner is under manual control.
Figure 4-11 Gas Valve Adjustments
CFLC 6000-12000CFLC 4000-5000
Low Fire
High Fire