AERCO BMK 6000 Dual Fuel - Manual (Page 119)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
OMM-0096_0B
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 119 of 219
GF-141
Ph.: 800-526-0288
03/21/2014
TABLE 8-1: BOILER TROUBLESHOOTING
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
AIRFLOW FAULT
DURING IGNITION
1. Blower stopped running due to thermal
or current overload.
2. Blocked Blower inlet or inlet air filter.
3. Blockage in Blower Proof switch.
4. Blockage in Blocked Inlet switch.
5. Defective Blower Proof switch.
6. Defective Blocked Inlet switch.
7. VFD has loose wire connection
8. Loose temperature to AUX connection in
I/O Box.
9. VFD failure
10. Defective temperature sensor.
11. Loose wire connection between the 0-
10V signal from I/O box to the Blower
input.
12. Defective I/O Box.
13. Wrong 0-10V output selection on the
control box.
1. Check combustion blower for signs of excessive heat or
high current drain that may trip thermal or current overload
devices.
2. Inspect the inlet to the combustion blower including the air
filter at the air/fuel valve for signs of blockage.
3. Remove the Blower Proof switch and inspect for signs of
blockage, clean or replace as necessary.
4. Remove the Blocked Inlet switch and inspect for signs of
blockage, clean or replace as necessary.
5. Check the continuity of the Blower Proof switch with the
combustion blower running. If there is an erratic resistance
reading or the resistance reading is greater than zero
ohms, replace the switch.
6. Turn off unit and check the continuity of the Blocked Inlet
switch. If there is an erratic resistance reading or the
resistance reading is greater than zero ohms, replace the
switch.
7. With power off, check VFD wire connections. Make sure
they are tightly secured on the wire, not the insulation
8. Check the actual inlet air temperature and measure voltage
at AUX input in the I/O Box. Verify that the voltage
conforms to the values shown in the tabular listing provided
in Appendix C.
9. LED Status indicator will indicate a failure mode. Use the
display, if available, or observe the blinking LED code on
the VFD and refer to the manufacturer’s literature for
directions.
10. Refer to CORRECTIVE ACTION 8 and verify that the
voltage conforms to the values shown in Appendix C.
11. Check wire connection from I/O Box 0-10V signal to the
Blower Motor.
12. Measure voltage at the I/O box 0-10V output. A voltage of
8.2V equates to a 100% open valve position.
13. Check the Analog Out option on the C-More Configuration
Menu. Valve Position 0-10V should be selected.