Additional Faults Without Specific Fault Messages - Aerco Benchmark BMK 750 User Manual

Benchmark 750-3000 Boiler Operation, Service, Maintenance Guide - KOREA
SECTION 5 – TROUBLESHOOTING GUIDE

5.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES

Refer to Table 5-2 to troubleshoot faults which may occur without a specific fault message being displayed.
TABLE 5-2: Boiler Troubleshooting With No Fault Message Displayed
Observed Incident
Hard Light-Off
Fluctuating Gas Pressure
Air/Fuel Valve "hunting" at
the 70% Valve Position
OMM-0128_0C
GF-206-K
Probable Causes
Clogged/damaged Gas Injector
1.
on Igniter-Injector (Figure 4-1a
through Figure 4-1c).
Defective Staged Ignition
2.
Solenoid (Figure 4-1a through
Figure 4-1c).
Gas pressure going into unit is
1.
fluctuating.
Damping Orifice not installed.
2.
IGST and Power Supply Boards
1.
in C-More Controller are
outdated.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Corrective Action
Disconnect the Staged Ignition Assembly solenoid from the Gas
1.
injector Tube of the Igniter-Injector (Figure 4-1a through Figure 4-1c)
and inspect Gas Injector to ensure it is not clogged or damaged.
Close the Manual Shutoff Valve. Attempt to start the unit and listen for
2.
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.
Stabilize gas pressure going into unit. If necessary, troubleshoot
1.
Building Supply Regulator.
Check if the gas train is supposed to have a Damping Orifice, and if
2.
so, ensure that it is installed in the SSOV Actuator shown in Figure 5-
1, below. For DBB Gas Trains, the Damping Orifice is installed in the
downstream SSOV Actuator).
Check to ensure that the IGST and Power Supply Boards are Rev. E
1.
or higher.
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Page 69 of 146
11/29/2017