Benchmark 2500 - 3000 Boilers
CHAPTER 4 – INITIAL START-UP
Page
54
of
204
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0094_0E
03/20/2014
Ph.: 800-526-0288
GF-137
4.2.3 Accessing the Analyzer Probe Port
The unit contains a 1/4” NPT port on the side of the exhaust manifold as shown in Figure 4-2.
Prepare the port for the combustion analyzer probe as follows:
Accessing the Analyzer Probe Port
1.
Refer to Figure 4-2 and remove the 1/4” NPT plug from the exhaust manifold.
2.
If necessary, adjust the stop on the combustion analyzer probe so it will extend mid-way into
the flue gas flow. DO NOT install the probe at this time.
Figure 4-2: Analyzer Probe Port Location (Right Side Partial View)
4.3 NATURAL GAS COMBUSTION CALIBRATION
The Benchmark boiler is combustion calibrated at the factory prior to shipping. This gas
pressure must be within the following ranges for each model of boiler
at full fire
:
BMK Boiler Model
Nominal Gas Pressure
BMK 2500
2.0” W.C. ±0.2” W.C.
BMK 3000
2.1” W.C. ±0.2” W.C.
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. Combustion Calibration 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.
Instructions for natural gas combustion calibration follow, with the BMK 2500 instructions first,
followed by the BMK 3000 instructions.
PRIMARY HOT
WATER INLET
EXHAST MANIFOLD
AIR INLET
ANALYZER PORT
CONDENSATE DRAIN
DRAIN VALVE
