AERCO BMK 1.5 LN May 2009 - Manual (Page 34)

INITIAL START-UP
Figure 4-5
VFD Controls and Displays
17. Press the M (Menu) programming key on
the VFD.
18. Using the up (▲) 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. This is thee
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.
20. Press the M key again and observe the
frequency shown in the right part of the
display. 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
6.0 % <100 ppm <30 ppm
21. If the oxygen level is not within the specified
range, adjust the level using the up (▲) and
down (▼) arrow keys on the VFD. Using the
up (▲) arrow key will increase oxygen level
and the down (▼) 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
6.3 % <50 ppm <30 ppm
23. Adjust the oxygen level as necessary 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
7.0 % <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
7.0 % <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 16% and
select VFD parameter 61. The oxygen level
at the 16% firing rate should be as shown in
the following tabular listing:
NOTE
At a 16% fire rate, if parameter 61 is
above 326, the VFD software will use 326
by default. 326 corresponds to a voltage
of 3.26 volts.
4-4