Aerco Benchmark 2.0 LN User Manual

Benchmark 2.0 LN Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
Page 104 of 168 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0046_0J
06/18/2015 Phone: 800-526-0288 GF-123
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. BOILER TROUBLESHOOTING WITH NO FAULT MESSAGE DISPLAYED
OBSERVED INCIDENT
PROBABLE CAUSES
CORRECTIVE ACTION
Hard Light-Off 1. Staged Ignition Ball Valve
closed.
2. Clogged/damaged Gas Injector
(Figure 8-2).
3. Defective Staged Ignition
Solenoid (Figure 8-2).
1. Open the 1/4” Ball Valve downstream of the SSOV (Fig. 8-1).
2. Remove and inspect Gas Injector to ensure it is not clogged or
damaged.
3. Close the 2” and the 1/4” Ball Valve downstream of the SSOV
(Fig. 8-1). 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.
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 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outdated.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.

Aerco Benchmark 2.0 LN Specifications

General

Brand	Aerco
Model	Benchmark 2.0 LN
Category	Boiler
Language	English