AM Series Boiler & Water Heater User Manual
CHAPTER 8
– UNIT START-UP
OMM-0100_E
•
GF-146
•
11/15/2019
Technical Support
•
(800) 526-0288
•
Mon-Fri, 8 am - 5 pm EST Page 100 of 170
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 comb
ustion analysis probe site 8” after the flue gas
exhaust connection (see Figure 6-2). To do so, f
ollow 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
