AERCO BMK 2.0 LN October 2012 - Manual (Page 51)

GF-123
Benchmark 2.0LN Low NOx Boiler
Chapter 4
OMM-0046_0F I nstallation, Operation and Maintenance Manual Initial Start-Up
PR1 10/17/12 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 Page 51 of 172
Install the 16” W.C. manometer(s) as described in the following steps:
1. Turn off the main gas supply upstream of the unit.
2. Remove the top panel and left or right side panel from the boiler to access the gas train
components.
3. Perform the RSI regulator Safe Test as described in paragraph 4.3. If test shows a
successful RSI ignition, proceed to the next step. If RSI ignition is not successful, follow
instructions in paragraph 4.3 before attempting Combustion Calibration.
4. To monitor the gas pressure on the downstream side of the SSOV during Combustion
Calibration (paragraph 4.4), remove the 1/4” NPT plug from the leak detection ball valve on
the downstream side of the SSOV as shown in Figure 4-1.
5. install a NPT-to-barbed fitting into the tapped plug port.
6. Attach one end of the plastic tubing to the barbed fitting and the other end to the 16” W.C.
manometer.
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 4-1. 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 Hole Location
4.3 RSI REGULATOR SAFE TEST
The Benchmark 2.0LN contains a RSI regulator in the Regulated Staged Ignition (RSI) line of
the unit. The RSI regulator is calibrated prior to shipment, however the RSI system should be
safe tested prior to performing the Combustion Calibration Procedure to ensure it is working
properly. RSI regulator safe testing is performed as follows: