AERCO KC Series Equipped with C-More version 3.04 - Manual (Page 33)

INITIAL START-UP
4-3
IMPORTANT
The unit is shipped from the factory set up for either natural gas or propane, as specified by the Style No.
on the Sales Order.
For propane units, refer to paragraph 4.4.
4.3 NATURAL GAS COMBUSTION CALIBRATION
The KC-1000 is shipped combustion calibrated from the factory. Recalibration as part of a start-up is
necessary due to altitude, gas BTU content, gas supply piping and supply regulators. Factory test data
sheets are shipped with each unit as a reference.
The following combustion calibration procedure closely follows the factory procedure. By following this
procedure readjustment of combustion will be kept to a minimum.
1. Open the supply and return valves to the unit and ensure that the system pumps are running.
2. Open the gas supply valve(s) to the unit.
3. 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.
4. Set the ON/OFF switch in the OFF position. Turn on AC power to the unit. The display will show LOSS
OF POWER and the time and date.
5. Set the unit to the Manual Mode by pressing the AUTO/MAN switch. A flashing Manual Valve position
message will be displayed with the present rate in %. Also, the MANUAL LED will light.
NOTE:
For a review of control panel operating procedures, see Section 3.
6. Adjust the rate to 0% by pressing the ▼ arrow key.
7. Set the ON/OFF switch to the ON position.
8. Change the valve position to 25% using the ▲ arrow key. This will put the unit into the starting
sequence.
NOTE:
On initial start-up, or return to service from a fault condition, the unit will remain at a 29% valve position for
two-minutes, although the control signal may indicate a greater input.
9. Following the warm-up period, increase the valve position in 20% increments while monitoring the gas
pressure after every increase. If gas pressure dips below 8.5” W.C. for FM gas trains and 8.9” for IRI
gas trains at any input percentage, stop and raise the pressure. Once 100% is reached, adjust the gas
pressure for 8.5” W.C. or 8.9” W.C.
NOTE:
If 8.5” W.C. for FM gas trains or 8.9” W.C. for IRI gas trains cannot be obtained at the 100% valve
position, 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.
10. Once 8.5” W.C. or 8.9” W.C. is set at the 100% level, change the valve position to 30%. Insert the
combustion analyzer probe into the stack.