AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 107)

GF-123
Benchmark 2.0LN Low NOx Boiler Chapter 8
OMM-0046_0E I nstallation, Operation and Maintenance Manual Troubleshooting
PR1 08/20/12 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 Page 107 of 170
8.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES
Refer to Table 8-2 to troubleshoot faults which may occur without a specific fault message being displayed.
TABLE 8-2. BOILER TROUBLESHOOTING WITH NO FAULT MESSAGE DISPLAYED
OBSERVED INCIDENT PROBABLE CAUSES CORRECTIVE ACTION
Hard Light-Off 1. Staged Ignition Ball Valve closed.
2. Clogged/damaged Gas Injector
(Figure 8-2).
3. Defective Staged Ignition Solenoid
(Figure 8-2).
4. RSI regulator out of adjustment.
1. Open the 1/4” Ball Valve downstream of the SSOV (Fig. 8-1).
2. Remove and inspect Gas Injector to ensure it is not clogged or
damaged.
3. Close the 2” and the 1/4” Ball Valve downstream of the SSOV (Fig. 8-
1). Start the unit and listen for a “clicking” sound that the Staged
Ignition Solenoid makes during Ignition Trial. If “clicking” sound is not
heard after 2 or 3 attempts, replace the Staged Ignition Solenoid.
4. See Chapter 7, Section 7.4.
Fluctuating Gas Pressure 1. Gas pressure going into unit is
fluctuating.
2. Damping Orifice not installed.
3. RSI Regulator not properly
adjusted.
1. Stabilize gas pressure going into unit. If necessary, troubleshoot
Building Supply Regulator.
2. Check to ensure that the Damping Orifice is installed in the SSOV
Actuator shown in Figure 8-3. (For IRI Gas Trains, the Damping Orifice
is installed in the downstream SSOV Actuator).
3. Refer to Chapter 4, paragraph 4.3 for RSI Regulator Calibration
procedure.
Air/Fuel Valve “hunting” at
the 80% Valve Position
1. IGST and Power Supply Boards in
Control Box are outdated.
1. Check to ensure that the IGST and Power Supply Boards are Rev. E
or higher.