Aerco BENCHMARK 2500DF User Manual page 107

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
FAULT INDICATION
DELAYED
INTERLOCK OPEN
DIRECT DRIVE
SIGNAL FAULT
FLAME LOSS
DURING IGN
OMM-0099_0A
GF-145
CHAPTER 8 – TROUBLESHOOTING GUIDE
TABLE 8-1: BOILER TROUBLESHOOTING – Continued
PROBABLE CAUSES
1. Delayed Interlock Jumper not
properly installed or missing.
2. Device proving switch hooked to
interlocks is not closed
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. Worn Flame Detector.
2. No spark from Spark Igniter.
3. Defective Ignition Transformer.
4. Defective Ignition/Stepper (IGST)
Board.
5. Defective SSOV.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
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.
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.
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.
Ph.: 800-526-0288
CORRECTIVE ACTION
Page 107 of 234
PR1: 05/21/2014