Additional Faults Without Specific Fault Messages - Watts Aerco Benchmark BMK750 Operation And Service Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 9 – TROUBLESHOOTING

9.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES

Refer to Table 9-2 to troubleshoot faults which may occur without a specific fault message being
displayed.
TABLE 9-2: Boiler Troubleshooting with No Fault Message Displayed
Observed
Probable Causes
Incident
Clogged/damaged Gas
1.
Injector on Igniter-Injector
(Figure 8-1a through Figure 8-
1c).
Hard Light-
Defective Staged Ignition
2.
Off
Solenoid (Figure 8-1a through
Figure 8-1c).
Gas pressure going into unit is
1.
fluctuating.
Fluctuating
Damping Orifice not installed.
2.
Gas
Pressure
DAMPING ORIFICE
COVER SCREW
Figure 9-1: SSOV Actuator with Gas Pressure Adjustment (SKP25)
OMM-0145_D • GF-218 •
11/2/2020
Corrective Action
Disconnect the Staged Ignition Assembly
1.
solenoid from the Gas 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
2.
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.
Stabilize gas pressure going into unit. If
1.
necessary, troubleshoot Building Supply
Regulator.
Check if the gas train is supposed to have a
2.
Damping Orifice, and if 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).
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
BRASS HEX HEAD
(Remove to access
the Gas Pressure Adjustment
Screw).
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