AERCO BMK 3.0 LN Dual Fuel 2007 - Manual (Page 38)

INITIAL START-UP
4-6
1. Open the water supply and return valves to
the unit and ensure that the system pumps
are running.
2. Open the propane supply valve(s) to the
unit.
3. Set the control panel ON/OFF switch to the
OFF position.
4. Turn on external AC power to the unit. The
display will show LOSS OF POWER and the
time and date.
5. Set the unit to the Manual Mode by pressing
the AUTO/MAN key. A flashing Manual Fire
Rate message will be displayed with the
present rate in %. Also, the MANUAL LED
will light.
6. Adjust the fire rate to 0% by pressing the ▼
arrow key.
7. Ensure that the leak detection ball valve
(Figure 4-1) downstream of SSOV No. 3 is
open.
8. Ensure that the Fuel Selector Switch (Figure
4-3 is in the PROPANE position.
9. Locate the Variable Frequency Drive (VFD)
on the front of the unit behind the panel door
(Figure 4-3). Insert the “LogicStick” with the
“PROPANE” label in the slot on the front of
the VFD.
10. Set the ON/OFF switch on the unit control
panel to the ON position.
11. Access the control panel Configuration
Menu and change the Max Fire Rate to
75%. (Refer to Chapter 3, para. 3.3 for
instructions on changing menu options).
12. Change the fire rate to 29% using the ▲
arrow key. The unit should begin its start
sequence and fire.
13. Next, increase the fire rate to 75%. Verify
that the gas pressure downstream of SSOV
No. 3 is 2.1” W.C. for both FM and IRI gas
trains. If gas pressure adjustment is
required, remove the brass hex nut on
downstream SSOV No. 3 (Figure 4-7). Make
gas regulator adjustments using a flat-tip
screwdriver to obtain 2.1” W.C.
14. With the firing rate at 75%, insert the
combustion analyzer probe into the flue
probe opening and allow enough time for the
combustion analyzer to settle.
SSOV #4
PROPANE
SSOV #2
NATURAL
GAS
SSOV #3
PROPANE
PROPANE
INLET
SSOV #1
NATURAL
GAS
NATURAL GAS
INLET
PROPANE
PRESSURE
REGULATOR
FEEDBACK
LINE
BRASS HEX HEAD CAP
(REMOVE TO ADJUST
PROPANE PRESSURE)
Figure 4-7
Regulator Adjustment Screw Location
NOTE
The 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
75%, 60%, 45%, 30% and 18% as
described in the following steps. These
steps assume that the inlet air
temperature is within the range of 50°F to
100°F.
15. 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.
16. Press the M (Menu) programming key on
the VFD.
17. Using the up (▲) arrow key, select VFD
parameter 70. The selected parameter will
appear in the left part of the display and the
frequency (Hz) will appear in the right part of
the display.
18. 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.