Benchmark 750-3000 Operation, Service & Maintenance Guide-Latin America
SECTION 5 – TROUBLESHOOTING GUIDE
OMM-0132A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
61
of
162
GF-206-LA-LA
Ph.: 800-526-0288
01/02/2018
TABLE 5-1: Boiler Troubleshooting Procedures
Fault
Indication
Probable Causes
Corrective Action
DELAYED
INTERLOCK
OPEN
1.
Delayed Interlock Jumper not properly installed
or missing.
2.
Device proving switch hooked to interlocks is
not closed.
1.
Check to insure jumper is properly installed across the delayed
interlock terminals in the I/O Box.
2.
If there are 2 external wires on these terminals, check to see if an
end switch for a proving device (such as a pump, louver, etc.) is tied
these interlocks. Ensure that the device and/or its end switch is
functional. A jumper may be temporarily installed to test the
interlock.
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.
C-More Controller 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 wiring continuity between source and unit.
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.
Worn Flame Detector.
2.
No spark from Spark Igniter.
3.
Defective Ignition Transformer.
4.
Defective Ignition/Stepper (IGST) Board.
5.
Defective SSOV.
1.
Remove and inspect the Flame Detector for signs of wear. Replace
if necessary.
2.
Close the internal gas valve in the unit. Install and arc a spark igniter
outside the unit.
3.
If there is no spark, check for 120VAC at the primary side to the
ignition transformer during the ignition cycle.
4.
If 120VAC is not present, the IGST Board in the C-More Controller
may be defective. Refer fault to qualified service personnel.
5.
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 valve input terminals.
If 120VAC is not present, the IGST board in the C-More Controller
may be defective. Refer fault to qualified service personnel.
