Aerco Benchmark BMK 750 User Manual page 61

Benchmark 750-3000 Boiler Operation, Service, Maintenance Guide - KOREA
SECTION 5 – TROUBLESHOOTING GUIDE
TABLE 5-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Indication
Delayed Interlock Jumper not properly installed
1.
or missing.
DELAYED
Device proving switch hooked to interlocks is
2.
INTERLOCK
not closed.
OPEN
Direct drive signal is not present:
1.
--Not yet installed.
--Wrong polarity.
--Signal defective at source.
DIRECT DRIVE
--Broken or loose wiring.
SIGNAL FAULT
Signal is not isolated (floating).
2.
C-More Controller signal type selection
3.
switches not set for correct signal type (voltage
or current).
1. Worn Flame Detector.
No spark from Spark Igniter.
2.
Defective Ignition Transformer.
3.
FLAME LOSS
4. Defective Ignition/Stepper (IGST) Board.
DURING IGN
Defective SSOV.
5.
OMM-0128_0C
GF-206-K
Corrective Action
Check to insure jumper is properly installed across the delayed
1.
interlock terminals in the I/O Box.
If there are 2 external wires on these terminals, check to see if an
2.
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.
Check I/O Box to ensure signal is hooked up.
1.
--Hook up if not installed.
--If installed, check polarity.
--Measure signal level.
--Check wiring continuity between source and unit.
Check signal at source to ensure it is isolated.
2.
Check DIP switch on PMC board to ensure it is set correctly for the
3.
type of signal being sent. Check control signal type set in
Configuration menu.
1. Remove and inspect the Flame Detector for signs of wear. Replace
if necessary.
Close the internal gas valve in the unit. Install and arc a spark
2.
igniter outside the unit.
If there is no spark, check for 120VAC at the primary side to the
3.
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.
While externally arcing the spark igniter, observe the open/close
5.
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.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Page 61 of 146
11/29/2017