AERCO BMK 2.0 LN Nat. Gas for Mass. only - Manual (Page 36)

INITIAL START-UP
Figure 4-5
VFD Controls and Displays
IMPORTANT
In the following steps, the values
appearing in the right part of the VFD
display for parameters 65, 64, 63, 62, 61
represent the base frequency (Hz) x 10.
For example: a displayed value of 326
corresponds to a frequency of 32.6 Hz.
17. Press the M (Menu) programming key on
the VFD.
18. Using the up (Λ) arrow key, select VFD
parameter 65. The selected parameter will
appear in the left part of the display and the
voltage frequency (Hz) will appear in the
right part of the display (see IMPORTANT
note above). This is the frequency of the AC
voltage sent to the blower.
19. With the selected VFD parameter display
flashing, press the M key. Code will be
displayed, requesting the valid code to be
entered. Enter code 59 using the arrow
keys. Press M again to store the valid code.
20. With parameter 65 displayed in the left part
of the VFD display, observe the oxygen level
(%) on the Combustion Analyzer. The
oxygen level at the 80% firing rate should be
as shown in the following tabular listing.
Also, ensure that the carbon monoxide (CO)
and nitrogen oxide (NOx) readings do not
exceed the values shown.
Combustion Oxygen Level at
80% Firing Rate
Oxygen %
± 0.2
Carbon
Monoxide NOx
5.0 % <100 ppm <30 ppm
21. If the oxygen level is not within the specified
range, adjust the level using the up (Λ) and
down (V) arrow keys on the VFD. Using the
up (Λ) arrow key will increase oxygen level
and the down (V) arrow key will decrease
the oxygen level.
22. Once the oxygen level is within the specified
range at 80%, lower the firing rate to 60%
and select VFD parameter 64. The oxygen
level at the 60% firing rate should be as
shown below.
Combustion Oxygen Level at
60% Firing Rate
Oxygen %
± 0.2
Carbon
Monoxide NOx
5.7 % <50 ppm <30 ppm
23. Adjust the oxygen level as necessary using
the up (Λ) and down (V) arrow keys on the
VFD to obtain the required reading at the
60% firing rate.
24. Next, set the firing rate to 45% and select
VFD parameter 63. The oxygen level at the
45% firing rate should be as shown below.
Combustion Oxygen Level at
45% Firing Rate
Oxygen %
± 0.2
Carbon
Monoxide NOx
7.2 % <50 ppm <30 ppm
25. Adjust the oxygen level as necessary to
obtain the required reading at the 45% firing
rate.
26. Next, set the firing rate to 30% and select
VFD parameter 62. The oxygen level at the
30% firing rate should be as follows:
Combustion Oxygen Level at
30% Firing Rate
Oxygen %
± 0.2
Carbon
Monoxide NOx
8.0 % <50 ppm <30 ppm
27. Adjust the oxygen level as necessary to
obtain the required reading at the 30% firing
rate.
28. Finally, reduce the firing rate to 18% and
select VFD parameter 61. The oxygen level
at the 18% firing rate should be as shown in
the following tabular listing:
4-4