Watts AERCO Edge CFR 3000 Operator's And Service Manual page 56

SECTION 9 TROUBLESHOOTING
TABLE 9-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Remote setpoint signal not present:
1.
•
Not yet installed.
•
Wrong polarity.
•
Signal defective at source.
•
Broken or loose wiring.
REMOTE SETPT
Signal is not isolated (floating) if 4
2.
SIGNAL FAULT
to 20 mA.
Edge Controller signal type
3.
selection switches not set for
correct signal type (voltage or
current).
Defective Flame Detector.
1.
SSOV not fully closed.
2.
RESIDUAL
FLAME
Wire strand from burner head in
3.
contact with Flame Detector
SSOV FAULT See SSOV SWITCH OPEN
DURING PURGE
SSOV FAULT SSOV switch closed for 15 seconds
DURING RUN during run.
SSOV relay failed on IGST board.
1.
Floating Neutral.
2.
SSOV RELAY
FAILURE
Hot and Neutral reversed at SSOV.
3.
Actuator not allowing for full
1.
closure of gas valve.
SSOV SWITCH
OPEN SSOV powered when it should not
2.
be
•
Corrective Action
Check I/O Box to ensure signal is hooked up.
1.
•
Hook up if not installed.
•
If installed, check polarity.
•
Measure signal level.
•
Check continuity of wiring between source
and unit.
Check signal at source to ensure it is isolated.
2.
Check DIP switch on PMC board to ensure it is set
3.
correctly for the type of signal being sent. Check
control signal type set in the Remote Signal
parameter (Advanced Setupà Unit à Application
Configuration).
Replace Flame Detector.
1.
Check open/close indicator window of Safety
2.
Shut-Off Valve (SSOV) and ensure that the SSOV
is fully closed. If not fully closed, replace the
valve and or actuator.
Close the Gas Shut-Off Valve downstream of
SSOV. Install a manometer or gauge at the leak
detection port between the SSOV and Gas Shut
Off Valve. If a gas pressure reading is observed
replace the SSOV Valve and/or Actuator.
Ensure Flame Detector is in good condition and is
3.
not tilted inward toward burner head.
Replace actuator.
1.
Press CLEAR button and restart unit. If fault
1.
persists, replace Ignition/Stepper (IGST) Board.
The Neutral and Earth Ground are not connected
2.
at the source and therefore there is a voltage
measured between the two. Normally this
measurement should be near zero or no more
than a few millivolts.
Check SSOV power wiring.
3.
Observe operation of the Safety Shut-Off Valve
1.
(SSOV) through indicator on the Valve actuator
and ensure that the valve is fully and not partially
closing.
If the SSOV never closes, it may be powered
2.
continuously. Close the gas supply and remove
power from the unit. Refer fault to qualified
service personnel.
• •