AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 88)

Chapter 7
Benchmark 2.0LN Low NOx Boiler
GF-123
Maintenance Installation, Operation and Maintenance Manual OMM-0046_0E
Page 88 of 170 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 PR1 08/20/12
7.4.1.2 RSI Regulator Calibration
RSI regulator calibration is performed as follows:
1. Ensure that gas supply shut-off valve upstream of the unit is still turned OFF.
2. Turn OFF electrical power to the system.
3. CLOSE the following valves in the unit’s gas train (refer to Figure 7-4):
• RSI Gas Supply Valve
• RSI Bleed-off Valve
• Manual Shut-off Valve (between the Air/Fuel Valve and the SSOV).
4. Remove the pipe plug from the 1/4” NPT port on the outlet side of the RSI regulator, insert
NPT-to-barbed adapter fitting, and insert tube from the 16” w.c. manometer.
5. Remove the cap from the RSI Pressure Regulator and rotate the regulator adjustment
(beneath cap) counter-clockwise (CCW) to its lowest possible pressure setting that will allow
the cap to be installed.
6. OPEN the main gas supply upstream of the unit.
7. Turn ON electrical power to the system.
8. Slowly OPEN the RSI Gas Supply Valve and observe the reading on the manometer. It
should have a reading of less than 8.0” w.c.
9. Start the boiler in MANUAL Mode. Observe the manometer pressure when the RSI solenoid
“clicks” open after purge. The manometer should now provide a reading of less than 5.0”
w.c.
10. Look into the observation port in the top head and ensure that you observe the orange glow
of the RSI flame during the ignition trial period.
NOTE
If you don’t see the orange glow, contact AERCO technical
support to ascertain the problem. If you DO see it, proceed to
the next step.
11. If the manometer reading is less than 3.0” w.c., increase the regulator setting by rotating the
adjustment screw clockwise (CW).
12. Repeat steps 8 through 11 until the gas pressure at the outlet of the RSI regulator reads
between 3.0” w.c. and 4.0” w.c. on the monometer.
13. Once the pressure reading is between 3.0” w.c. and 4.0” w.c., conduct at least three safe
RSI ignitions while observing the observation port. Assure the igniter lights immediately with
a strong orange flame after the Staged Ignition Solenoid Valve opens.
NOTE
Clear any Flame Loss During Ignition messages during the
tests by pressing The CLEAR key on control panel.
14. Close the external gas supply and RSI Staged Ignition Gas Valves. Disconnect the
manometer, tubing and barbed fitting from the 1/4” NPT port hole.
15. Bleed off any remaining pressure using the RSI bleed-off valve, then ensure this valve is
closed.
16. Replace the 1/4” plug in place of the barbed fitting.
17. OPEN the gas supply upstream of the unit.