AERCO BMK 1.5 LN Dual Fuel Jan 2009 - Manual (Page 34)

INITIAL START-UP
20. Once the oxygen level is within the specified
range at 100%, lower the firing rate to 80%.
USE 1/2"
WRENCH TO
INCREASE (CW)
OR DECREASE
(CCW) INLET AIR
IRIS ADJUSTMENT
VIEW A - A
AIR INLET
IRIS AIR
DAMPER
A A
AIR/FUEL
VALVE
FRONT
Figure 4-5
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 controls will be used to
adjust the oxygen level (%) at firing rates
of 80%, 60%, 45%, 30% and 16% as
described in the following steps. These
steps assume that the inlet air
temperature is within the range of 50°F to
100°F.
21. Locate the Variable Frequency Drive (VFD)
behind the front door of the unit (Figure 4-3).
Refer to the VFD operating controls shown
in Figure 4-6.
Figure 4-6
VFD Controls and Displays
22. Press the M (Menu) programming key on
the VFD.
23. 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.
24. 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.
25. 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
26. 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.
4-4