AM Series Boilers and Water Heaters
CHAPTER 8 – UNIT START-UP
Page
90
of
154
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0100_0D
03/28/16
Ph.: 800-526-0288
GF-146
8.7 Combustion Calibration
Table 8-1 lists the correct CO
2
and O
2
ranges for a unit running at normal operating conditions.
CO
2
values outside of the ranges given in Table 8-1 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, compare CO (carbon monoxide) readings
with the value given in Table 8-1. 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 6-2). 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 2201 to HIGH (see Section 9.16)
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. Increase the setpoint to any valve above "OFF", such as 90°F.
5. Wait 2 to 3 minutes for the
CO
2
to stabilize;
6. Insert the probe of a calibrated combustion analyzer into the combustion analysis
opening, as shown in Figure 6-2, and take a flue gas sample.
7. Compare the
CO
2
reading with the high fire range given in Table 8-1, 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 8-2 of the gas valve
closest
to the burner
unit in fire. Use a 2.5 mm 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 8-1: Combustion Calibration Values
