AERCO BMK 1500-2000 - Manual (Page 109)

Benchmark 1500 - 2000 Boilers
CHAPTER 8 – TROUBLESHOOTING GUIDE
OMM-0097_0D
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 109 of 188
GF-142
Ph.: 800-526-0288
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. Clogged/damaged Gas Injector
on Igniter-Injector (Figure 8-1).
2. Defective Staged Ignition
Solenoid (Figure 8-1).
1. Disconnect the Staged Ignition Assembly solenoid from
the Gas injector Tube of the Igniter-Injector (Figure 8-1)
and inspect Gas Injector to ensure it is not clogged or
damaged.
2. Close the 2” Manual Shutoff Valve. Attempt to 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.
Fluctuating Gas Pressure 1. Gas pressure going into unit is
fluctuating.
2. Damping Orifice not installed.
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 8-2. (For IRI (DBB) Gas
Trains, the Damping Orifice is installed in the downstream
SSOV Actuator).
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in Control Box are outdated. 1.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.