AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 82)

CHAPTER 7: MAINTENANCE
Page 82 of 162 PR2: 05/09/12
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
4. Remove the pipe plug from the 1/4” NPT port on the outlet side of the RSI regulator and
insert a NPT-to-barbed adapter fitting (see Figure 7-4).
5. Attach one end of the plastic tubing to the barbed fitting and the other end to the 16” W.C.
manometer.
6. Remove the cap from the RSI Pressure Regulator and rotate the regulator adjustment
(beneath cap) counterclockwise (CCW) to its lowest possible pressure setting that will allow
the cap to be installed.
7. OPEN the main gas supply upstream of the unit.
8. Turn ON electrical power to the system.
9. 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.
10. Start the boiler in MANUAL Mode. Observe the manometer pressure when the RSI
solenoid “clicks” open after purge. It should now provide a reading of less than 5.0” w.c.,
but not less than 3.0” w.c..
11. 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.
12. If the pressure is within specifications, return the unit to service. Make sure that the unit is
operating in AUTO Mode. The “MAN” light in the upper left of the control box should NOT
be lit when in AUTO Mode.
13. If the RSI regulator is NOT within specifications, proceed to paragraph 7.4.1.2, RSI
Regulator Calibration, and initiate the pressure calibration procedures
RSI Regulator Calibration 7.4.1.2
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.