Watts AERCO Benchmark BMK5000 Operation And Service Manual page 134

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
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.
•
Broken or loose wiring.
DIRECT DRIVE
SIGNAL FAULT
Signal is not isolated (floating).
2.
Edge Controller signal type selection switches
3.
not set for correct signal type (voltage or
current).
Worn Flame Detector.
1.
No spark from Spark Igniter.
2.
Defective Ignition Transformer.
3.
FLAME LOSS
DURING IGN Defective Ignition/Stepper (IGST) Board.
4.
Defective SSOV.
5.
OMM-0137_J • Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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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 if an end
2.
switch for a proving device (such as a pump, louver, etc.) is tied to
the interlocks. Ensure 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 the Controller's Interface board to ensure it is
3.
set correctly for the type of signal being sent. Check control signal
type set in Advanced Setup
Configuration screen.
Remove and inspect the Flame Detector for signs of wear. Replace
1.
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.
If 120VAC is not present, the IGST Board in the Edge Controller
4.
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 isn't present, the Edge Controller's IGST
board may be defective. Refer fault to qualified service personnel.
Page 134 of 167
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BST Cascade Application