Additional Faults Without Specific Fault Messages - Watts AERCO Benchmark BMK5000 Operation And Service Manual

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING

10.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES

Refer to Table 10-2 to troubleshoot faults which may occur without a specific fault message being displayed.
TABLE 10-2: Boiler Troubleshooting with No Fault Message Displayed
Observed Incident
Hard Light-Off
Fluctuating Gas Pressure
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12/20/2022
Probable Causes
Clogged/damaged Gas Injector
1.
on Igniter-Injector (Figure 8-1a
through Figure 8-1c).
Defective Staged Ignition
2.
Solenoid (Figure 8-1a through
Figure 8-1c).
Gas pressure going into unit is
1.
fluctuating.
Damping Orifice not installed.
2.
DAMPING ORIFICE
COVER SCREW
Figure 10-1: SSOV Actuator with Gas Pressure Adjustment (SKP25)
Corrective Action
Disconnect the Staged Ignition Assembly solenoid from the Gas
1.
injector Tube of the Igniter-Injector (Figure 8-1a through Figure 8-1c)
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, as shown in Figure
10-1, below. For DBB Gas Trains, the Damping Orifice is installed in
the downstream SSOV Actuator).
BRASS HEX HEAD
(Remove to access
the Gas Pressure Adjustment
Screw).
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