Watts Aerco Benchmark OMM-0117 Operation And Maintenance Manual page 66

Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 5 – TROUBLESHOOTING GUIDE
TABLE 5-1: Boiler Troubleshooting Procedures
FAULT
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
2. Signal is not isolated (floating).
C-More Controller signal type selection
3.
switches not set for correct signal type (voltage
or current).
Worn Flame Detector.
1.
FLAME LOSS
No spark from Spark Igniter.
2.
DURING IGN
Defective Ignition Transformer.
3.
NOTE:
Before starting
Defective Ignition/Stepper (IGST) Board.
4.
the Probable
Causes and
Corrective Action
Defective SSOV.
5.
for this fault, refer
to the Flow Chart
provided in
Figure 5-4 at the
end of this
6. Pilot Scanner failed
Chapter.
OMM-0118_B • GF-203 • 5/9/2019
PROBABLE CAUSES
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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.
2. Check signal at source to ensure it is isolated.
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.
Remove and inspect the Flame Detector for signs of wear.
1.
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.
If 120VAC is not present, the IGST Board in the C-More 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 is not present, the IGST board in the C-More
Controller may be defective. Refer fault to qualified service
personnel.
6. Check scanner Red LED. It should change from flashing to steady
when pointed at a small flame from a match or lighter.
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