AERCO BMK 6000 Dual Fuel - Manual (Page 130)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
Page 130 of 219
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0096_0B
03/21/2014
Ph.: 800-526-0288
GF-141
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: WATER HEATER TROUBLESHOOTING WITH NO FAULT MESSAGE DISPLAYED
OBSERVED INCIDENT PROBABLE CAUSES CORRECTIVE ACTION
HARD LIGHT-OFF
1. Clogged/damaged Gas Orifice on
Pilot (Figure 8-2).
2. Defective Pilot Ignition Solenoid
(Figure 8-2)
3. Pilot Regulator not calibrated
correctly.
1. Disconnect the Pilot gas orifice from the Gas injector Tube
(Figure 8-2) and inspect to ensure it is not clogged or
damaged.
2. Close the 2” Manual Shutoff Valve and the 1/4” Pilot Gas
Valve that connects to the flex hose of the Pilot Ignition
Assy. (Figure 8-1). Attempt to start the unit and listen for a
“clicking” sound that the Pilot Ignition Solenoid makes
during Ignition Trial. If “clicking” sound is not heard after 2
or 3 attempts, replace the Pilot Ignition Solenoid.
3. Refer to Chapter 7, section 7.5.2 and check the calibration
of the Pilot Regulator.
FLUCTUATING GAS
PRESSURE
1. Gas pressure going into unit is
fluctuating.
2. Damping Orifice not installed.
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 8-3. (For IRI (DBB) Gas
Trains, the Damping Orifice is installed in the downstream
SSOV Actuator).
AIR/FUEL VALVE
“HUNTING” AT THE 80%
VALVE POSITION 1. IGST and Power Supply Boards
in Control Box are outdated. 1. Check to ensure that the IGST and Power Supply Boards
are Rev. E or higher.