Additional Faults Without Specific Fault Messages - Watts Aerco Benchmark OMM-0117 Operation And Maintenance Manual

Benchmark 5000-6000 Operation & Maintenance Manual
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 Procedures with No Fault Message Displayed
OBSERVED INCIDENT PROBABLE CAUSES
1.
2.
HARD LIGHT-OFF
3.
1.
FLUCTUATING GAS
2.
PRESSURE
1.
Air/Fuel Valve "hunting" at
the 70% Valve Position
OMM-0118_B • GF-203 • 5/9/2019
Clogged/damaged Gas Injector on
Igniter-Injector (Figure 5-1).
Defective Ignition Solenoid (Figure
5-1).
Pilot Regulator not calibrated
correctly.
Gas pressure going into unit is
fluctuating.
Damping Orifice not installed.
IGST and Power Supply Boards in
C-More Controller are outdated.
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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.
Close the 2" Manual Shutoff Valve. Attempt to start the unit and listen
2.
for a "clicking" sound that the Ignition Solenoid makes during Ignition
Trial. If "clicking" sound is not heard after 2 or 3 attempts, replace the
Ignition Solenoid.
Refer to Section 4.5.2, above, and check the calibration of the Pilot
3.
Regulator.
Stabilize gas pressure going into unit. If necessary, troubleshoot
1.
Building Supply Regulator.
Check to ensure that the Damping Orifice is installed in the SSOV
2.
Actuator shown in Figure 5-3. (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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