Additional Faults Without Specific Fault Messages - Aerco BENCHMARK 2500DF User Manual

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual

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
Hard Light-Off
Fluctuating Gas Pressure
Air/Fuel Valve "hunting" at the
80% Valve Position
Page 116 of 234
05/21/2014
CHAPTER 8 – TROUBLESHOOTING GUIDE
PROBABLE CAUSES
1. Clogged/damaged Gas Injector on
Igniter-Injector (Figure 8-1).
2. Defective Staged Ignition Solenoid
(Figure 8-1)
1. Gas pressure going into unit is
fluctuating.
2. Damping Orifice not installed.
1. IGST and Power Supply Boards in
Control Box are outdated.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
CORRECTIVE ACTION
1. Disconnect the 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.
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).
1. Check to ensure that the IGST and Power Supply Boards are
Rev. E or higher.
OMM-0099_0A
GF-145