Section 4 — CFC Commissioning
Part No. 750-263 4-21
IGNITION FAILURE CHECK
7. A test of the flame rod circuit can also be performed at this time.
Disconnect the flame rod cable and attempt to start the burner.
The CB Falcon should lock out, indicating Lockout 109 Ignition
Failure.
8. Replace flame rod electrode and grounding tab.
After verifying proper operation of LGPS, HGPS, CAPS, and Gas
Valve, re-open the downstream manual shut-off valve.
4. 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 (Figure 4-6).
3. Press RESET-TEST switch once to reset.
5. Low and High Fire Adjustments
All CFC 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.
Adjustments are made using a TORX® T40 (low fire adjustment)
and 3 mm hex wrench (main gas choke). The adjustment screws
should initially be set to half way through each setting’s range. The
low fire adjustment screw is accessed by removing the slotted cap
on the gas regulator using a blade screwdriver (see Figure 4-7). The
high fire adjustment screw is accessed by removing the blue plastic
cap from the valve cover (Figure 4-8).
Turn the adjustment screw completely clockwise, counting the turns
until the screw will no longer turn. Then, turn the adjustment screw
counterclockwise half the number of turns counted when turning
clockwise.
NOTE:When adjusting low fire offset, clockwise adjustments
increase gas flow, and counterclockwise adjustments
decrease gas flow.
When adjusting the main gas choke, clockwise adjustments
decrease gas flow, and counterclockwise adjustments
increase gas flow.
Refer to Appendix A for further information on gas valve setup,
operation, and testing.
6. 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 4-6 Low Water Cutoff test
Figure 4-7 Regulating Adjusting
Screw - Low Fire Offset
Figure 4-8 Main Gas Choke -
High Fire Adjustment
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