AERCO KC Standard to Low NOx Convertion Instructions User Manual

Page 35

5.3 Combustion Calibration For Units With C-More or Modular Control Systems

The Combustion Calibration procedures for KC1000 Boilers or Water Heaters equipped with either C-
More or Modular Control Systems are virtually identical. Using the following procedures will minimize
readjustment of combustion.

NOTE

For a review of the control panel operating procedures for the installed control
system, refer to Section 3 of the appropriate O & M Manual listed in paragraph
5.

1. Open the supply and return valves to the unit and ensure that the system pumps are running.

Open the gas supply valve(s) to the unit.

2. If a lockup style regulator is installed as a gas supply regulator, adjust the gas supply until a

reading of 12” W.C. static pressure is obtained.

3. Set

the

ON/OFF switch to the OFF position. Turn on AC power to the unit.

4. Set the unit to the Manual Mode.

5. Adjust the firing rate to 0%.

6. Set

the

ON/OFF switch to ON.

7. Change the firing rate to 25%. This will put the unit in the starting sequence.

NOTE

On initial start-up, or return to service from a fault condition, the unit will
remain at a 29% firing rate for two-minutes, although the control signal may
indicate a greater input.

8. Following the warm-up period, increase the firing rate in 20% increments while monitoring the

gas pressure after every increase. If gas pressure dips below 9.5” W.C. for FM gas trains and
9.9” for IRI gas trains at any input firing rate percentage, stop and raise the pressure. Once
100% is reached, adjust the gas pressure for 9.5” (FM) W.C. or 9.9” W.C. (IRI).

NOTE

If 9.5” W.C. for FM gas trains or 9.9” W.C. for IRI gas trains cannot be
obtained at the 100% firing rate, it will be necessary to stop calibration and
contact the local AERCO representative in your area. Running the unit on
insufficient gas pressure will void the warranty.

9. Once 9.5” W.C. or 9.9” W.C. is set at the 100% level change the firing rate to 30%. Insert the

combustion analyzer probe into the stack.