Watts AERCO Edge CFR 3000 Operator's And Service Manual page 51

SECTION 9 TROUBLESHOOTING
TABLE 9-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Blockage in air filter or Blocked Inlet
3.
switch.
Defective Blocked Inlet switch.
4.
Combustion oscillations.
5.
Probable causes from 3 to 16 for
6.
AIRFLOW FAULT DURING IGNITION
applies for this fault.
Delayed Interlock Jumper not
1.
properly installed or missing.
Device proving switch hooked to
2.
DELAYED
interlocks is not closed.
INTERLOCK
OPEN
Direct drive signal is not present:
1.
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DIRECT DRIVE
SIGNAL FAULT
Signal is not isolated (floating).
2.
Edge Controller signal type
3.
selection switches not set for
correct signal type (voltage or
current).
Worn Flame Detector.
1.
No spark from Spark Igniter.
2.
Defective Ignition Transformer.
3.
Defective Ignition/Stepper (IGST)
4.
FLAME LOSS
Board.
DURING IGN
Defective SSOV.
5.
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Not yet installed.
Wrong polarity.
Signal defective at source.
Broken or loose wiring.
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Corrective Action
Remove the air filter and Blocked Inlet switch
3.
and inspect for signs of blockage, clean or replace
as necessary.
Verify that 24 VAC is present between each side
4.
of the switch and ground. If 24 VAC is not present
at both sides, replace switch.
Run unit to full fire. If the unit rumbles or runs
5.
rough, perform combustion calibration.
See CORRECTIVE ACTIONS from 3 to 12 for
6.
AIRFLOW FAULT DURING IGNITION.
Check that jumper is properly installed across the
1.
Delayed Interlock terminals in the I/O Box.
If there are 2 external wires on these terminals,
2.
check to see if an end switch for a proving device
(pump, louver, etc.) is tied to 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.
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Hook up if not installed.
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If installed, check polarity.
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Measure signal level.
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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
3.
board to ensure it is set correctly for the type of
signal being sent. Check control signal type set in
Advanced Setup à BST Cascade à Application
Configuration screen.
Remove and inspect the Flame Detector for signs
1.
of wear. Replace if necessary.
Close the internal gas valve in the unit. Install and
2.
arc a spark igniter outside the unit.
If there is no spark, check for 120VAC at the
3.
primary side to the ignition transformer during
the ignition cycle.
If 120VAC is not present, the IGST Board in the
4.
Edge Controller may be defective. Refer fault to
qualified service personnel.
While externally arcing the spark igniter, observe
5.
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 Edge Controller may be defective.
Refer fault to qualified service personnel.
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