AERCO BMK 2.0 LN Dual Fuel Nov 2010 - Manual (Page 36)

INITIAL START-UP
4. Install a NPT-to-barbed fitting into the
tapped plug port.
5. Attach one end of the plastic tubing to the
barbed fitting and the other end to the 16
inch W.C. manometer.
NATURAL
GAS INLET
PROPANE
INLET
1/8" NPT PLUG
(INSTALL
MANOMETER
HERE)
LEAK
DETECTION
BALL VALVE
PROPANE PRESSURE
REGULATOR FEEDBACK
LINE
PROPANE HIGH
GAS PRESSURE
SWITCH
NAT. GAS HIGH
GAS PRESSURE
SWITCH
TO
AIR/FUEL
VALVE
NATURAL GAS
SSOV
NAT. GAS
PRESSURE
REGULATOR
FEEDBACK
LINE
PROPANE
LOW GAS
PRESSURE
SWITCH
NAT. GAS
LOW GAS
PRESSURE
SWITCH
PROPANE
SSOV
BENCHMARK 2.0LN DUAL-FUEL FM GAS TRAIN
Figure 4-1.
1/8" NPT Plug Location On Leak
Detection Ball Valve
4.2.3 Accessing the Analyzer Probe Port
The unit contains NPT plugs on the left and right
side of the exhaust manifold at the rear of the
unit as shown in Figure 4-2. Prepare the port for
the combustion analyzer probe as follows:
1. Remove the plug from the probe port on the
left or right side of the exhaust manifold.
2. If necessary, adjust the stop on the
combustion analyzer probe so that it will
extend mid-way into the flue gas flow. DO
NOT install the probe at this time.
EXHAUST
MANIFOLD
1/2” NPT
CONDENSATE
DRAIN
CONNECTION
BOILER
RETURN
ANALYZER
PROBE PORT
Figure 4-2
Analyzer Probe Port Location
IMPORTANT
For Dual Fuel units, perform the natural
gas combustion calibration procedures in
paragraph 4.3 before performing the
propane combustion calibration proce-
dures in paragraph 4.4.
Refer to Appendix K for switchover
instructions when changing from Natural
Gas to Propane or from Propane to
Natural Gas.
4.3 NATURAL GAS COMBUSTION
CALIBRATION
The Benchmark 2.0LN Boiler is combustion
calibrated at the factory prior to shipping.
However, recalibration as part of initial start-up
is necessary due to changes in the local altitude,
gas BTU content, gas supply piping and supply
regulators. Factory Test Data sheets are
shipped with each unit. These sheets must be
filled out and returned to AERCO for proper
Warranty Validation.
It is important to perform the following procedure
as outlined. This will keep readjustments to a
minimum and provide optimum performance.
4-2