Gf-123, Benchmark 2.0ln low nox boiler – AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) User Manual

Page 99

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GF-123

Benchmark 2.0LN Low NOx Boiler

Chapter 8

OMM-0046_0E

I

nstallation, Operation and Maintenance Manual

Troubleshooting

PR1 08/20/12

AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288

Page 99 of 170


TABLE 8-1. BOILER TROUBLESHOOTING (Continued)

FAULT

INDICATION

PROBABLE CAUSES

CORRECTIVE ACTION

DIRECT DRIVE
SIGNAL FAULT

1. Direct drive signal is not present:

Not yet installed.
Wrong polarity.
Signal defective at source.
Broken or loose wiring.

2. Signal is not isolated (floating).

3. Control Box signal type selection

switches not set for correct signal type
(voltage or current).

1. Check I/O Box to ensure signal is hooked up.

Hook up if not installed.
If installed, check polarity.
Measure signal level.
Check continuity of wiring between source and boiler.

2. Check signal at source to ensure it is isolated.

3. Check DIP switch on PMC board to ensure it is set correctly for the

type of signal being sent. Check control signal type set in
Configuration Menu.

FLAME LOSS

DURING IGN

1. Burner Ground Screw not installed or

loose.

2. Worn flame detector

3. No spark from Spark Plug

4. Defective Ignition Transformer

5. Defective Ignition/Stepper (IGST) Board

6. Defective SSOV





7. RSI Regulator not properly adjusted.


8. Closed RSI Gas Valve in RSI line.

1. Inspect and install/retighten Burner Ground Screw.

2. Remove and inspect the flame detector for signs of wear. Replace

if necessary.

3. Close the internal gas valve in the boiler. Install and arc a spark

igniter outside the unit.

4. If there is no spark, check for 120VAC at the primary side to the

ignition transformer during the ignition cycle.

5. If 120VAC is not present, the IGST Board in the Control Box may

be defective. Refer fault to qualified service personnel.

6. While externally arcing the spark igniter, observe the open/close

indicator in the Safety Shut-Off Valve to ensure it is opening. If the
valve does not open, check for 120VAC at the valves input
terminals. If 120VAC is not present, the IGST board in the Control
Box may be defective. Refer fault to qualified service personnel.

7. Refer to Chapter 7, paragraph 7.4 and check the RSI Regulator

calibration. The RSI regulator output should be between 3.0” W.C.
and 5.0” W.C.

8. Check position of RSI Gas Valve (Figure 8-1).

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