AERCO BMK 1000 User Manual
Page 105
Benchmark 750/1000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
OMM-0082_0J
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 105 of 192
GF-130
Ph.: 800-526-0288
05/21/2014
TABLE 8-1. BOILER TROUBLESHOOTING – Continued
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.
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 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 Control Box
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 Control Box may be defective. Refer fault to
qualified service personnel.