AERCO AM Series Boiler User Manual - Manual (Page 95)

AM Series Boilers and Water Heaters
CHAPTER 4 – UNIT START-UP
OMM-0100_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 95 of 156
GF-146
Ph.: 800-526-0288 PRI - 07/14/14
4.7 Combustion Calibration
Table 4-1 lists the correct CO
2
and O
2
ranges for a unit running at normal operating conditions
at an altitude below 4500 feet (1371 meters). CO
2
values outside of the ranges given in Table 4-
1 may lead to malfunctioning of the unit and cause it to prematurely fail. To check the CO
2
values, carry out a combustion analysis as described below:
WARNING!
During this procedure, also compare CO (carbon monoxide)
readings with the value given in Table 11-1. If this is higher, STOP
the boiler and call the Factory service department (see phone
number on the last cover page). Failure to comply with this
requirement could result in severe personal injury, death or
substantial property damage
Combustion Calibration
1. If it is not already present, create a combustion analysis probe site 8” after the flue gas
exhaust connection (see Figure 3-28, item “H”). To do so, follow the vent pipe
manufacturers’ instruction.
2. Keep the boiler or water heater in stand-by by pushing either button (for water
heaters) or (for boilers) until the word OFF is seen in the display.
3. Gain access to the Installer menu and set parameter 2010 to HIGH (see Section 5.4) so
the “Burner 1 (Master) will run for 20 minutes at high fire input, then generate a demand
for heat by pressing the
button.
4. Wait 2 to 3 minutes for the CO
2
to stabilize;
5. Insert the probe of a calibrated combustion analyzer into the combustion analysis probe
“H” of Figure 3-28 and take a flue gas sample.
6. Compare the CO
2
reading with the high fire range given in Table 4-1, making sure to use
the range for the gas type in use. If the CO
2
reading is outside the specified range, it
must be adjusted using the “E” screw in Figure 4-2 of the gas valve closest to the burner
unit in fire. Use a 2.5mm Allen Wrench to turn the screw (clockwise to reduce the
CO
2
level, counter-clockwise to increase the CO
2
level) in small increments and wait for the
CO
2
to stabilize to prevent overshooting the desired value.
Table 4-1: Combustion Calibration Values