AERCO BMK 1.5 LN Dual Fuel Jan 2009 - Manual (Page 36)

INITIAL START-UP
7. Ensure that the leak detection ball valve
down-stream of the Propane SSOV (Figure
4-1) 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 to the ON position.
11. Access the control panel Configuration
Menu and change the Max Fire Rate to
70%. (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 70%. Verify
that the gas pressure downstream of the
Propane SSOV is 1” W.C. for both FM and
IRI gas trains. If gas pressure adjustment is
required, refer to Figure 4-7 and remove the
brass hex nut on the Propane SSOV
actuator containing the gas pressure
regulator. (For IRI gas trains, the regulator is
on the downstream SSOV). Make gas
regulator adjustments using a flat-tip
screwdriver to obtain 1” W.C.
NATURAL
GAS INLET
PROPANE
INLET
PROPANE
SSOV WITH
REGULATOR
NATURAL
GAS
SSOV WITH
REGULATOR
BRASS HEX HEAD CAP
(REMOVE TO ADJUST
PROPANE REGULATOR)
Figure 4-7
Regulator Adjustment Screw Location
14. With the firing rate at 70%, insert the
combustion analyzer probe into the vent
probe port opening (Figure 4-2) and allow
enough time for the combustion analyzer to
settle.
NOTE
The combustion calibration steps utilize
the Variable Frequency Drive (VFD)
located behind the front door of the unit
(Figure 4-3). The VFD controls will be
used to adjust the oxygen level (%) at
firing rates of 70%, 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.
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
voltage 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.
19. 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) reading does not exceed the
values shown.
Combustion Oxygen Level at
70% Firing Rate
Oxygen %
± 0.2
Carbon
Monoxide
5.4 % <100 ppm
20. 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.
21. Once the oxygen level is within the specified
range at 70%, lower the firing rate to 60%
and select VFD parameter 69. The oxygen
level at the 60% firing rate should be as
shown below.
4-6