AERCO Esteem Boiler with EZ-Set Controller - Manual (Page 95)

GF-135 Esteem 399 Low NOx Boiler
Chapter 12
OMM-0089_0A
Installation, Operation & Maintenance Manual Start-Up Procedures
Verifying Correct Flame Pattern and Combustion (Cont.)
d) Press the OK button while the FAN icon is highlighted to manually fire the burner and
power the CH circulator.
NOTE
An adequate CH load must be present to dissipate the heat
generated during the combustion test. If an adequate CH load is
not available, an indirect water heater can be used to dissipate the
heat by creating a DHW call which will enable the DHW circulator.
Table 12-1: Recommended Combustion Levels
Combustion Gases Natural Gas Propane Gas
O
2
Min.
2.30% 3.70%
O 2 Max.
5.30% 5.20%
CO 2 Min.
8.80% 10.00%
CO 2 Max.
10.50% 11.00%
CO Max.
100 ppm 100 ppm
e) Press the LEFT and RIGHT buttons to adjust the firing rate from 1% to 100%.Hold down
the LEFT or RIGHT but-ton to rapidly increase or decrease the firing rate.
f) Press the OK button while the FAN icon is highlighted to shut-down the burner.
g) Cycle power to the boiler once combustion testing is complete to return to normal
operation.
WARNING!
The combustion levels should be measured at high firing rate. If
the combustion levels are outside the range given in Table 12-1 for
the firing rate, shut the boiler down and contact AERCO Technical
Support. Failure to comply with this requirement could result in
severe personal injury, death, or substantial property damage.
3. If the combustion levels during high fire (100%) are outside the recommended combustion
settings in Table 12-1, adjust the Throttle Screw (see Figure 12-2) as follows:
• Counter-clockwise rotation: O
2
decreases and CO
2
increases
• Clock-wise rotation: O
2
increases and CO
2
decreases.
4. Once the combustion level is set at high fire (100%), manually place the boiler into low fire
(1%) mode by pressing the LEFT button to adjust firing rate downward.
5. If the CO2 combustion level during low fire (1%) is not within +/- 0.2 of the combustion level
measured at high fire, adjust the plastic Offset Pressure Screw under the cover screw on
the top of the gas valve (see Figure 12-2).
6. Counter-clockwise adjustment of the Offset Pressure Screw at Low Fire:
• Counter-clockwise rotation: O
2
decreases and CO
2
increases
• Clock-wise rotation: O
2
increases and CO
2
decreases.
Page 95 of 188 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0089_0A
MC1 06/19/14 Ph.: 800-526-0288