AERCO BMK 3.0 LN Nat. Gas APRIL 2009 - Manual (Page 36)

INITIAL START-UP
Figure 4-4
Iris Air Damper Location/Adjustment
NOTE
The remaining combustion calibration
steps utilize the Variable Frequency Drive
(VFD) located behind the front door of the
unit. The VFD up (Λ) and down (V) arrow
keys will be used to adjust the oxygen
level (%) at firing rates of 70%, 50%,
40%, 30% and 14% as described in the
following steps.
16. Locate the Variable Frequency Drive (VFD)
behind the front door of the unit. Refer to the
VFD operating controls shown in Figure 4-5.
17. Press the M (Menu) programming key on
the VFD.
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.
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
power frequency (Hz) supplied to the blower
will appear in the right part of the display
(see IMPORTANT note above).
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 70% 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
70% Firing Rate
Oxygen %
± 0.2
Carbon
Monoxide NOx
6.0 % <100 ppm <30 ppm
4-4