Watts Aerco Benchmark Series Operation And Service Manual page 141

Benchmark Platinum-Edge: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Loose or broken wiring.
1.
OUTDOOR
Defective Sensor.
2.
TEMP SENSOR
FAULT
Incorrect Sensor.
3.
Internal recirculation pump failed.
1.
RECIRC PUMP
FAILURE
1. Remote setpoint signal not present:
•
Not yet installed.
•
Wrong polarity.
•
Signal defective at source.
REMOTE
•
Broken or loose wiring.
SETPT SIGNAL
Signal is not isolated (floating) if 4 to 20 mA.
2.
FAULT
Edge Controller signal type selection switches not
3.
set for correct signal type (voltage or current).
Defective Flame Detector.
1.
2. SSOV not fully closed.
RESIDUAL
FLAME
Wire strand from burner head in contact with
3.
Flame Detector
See SSOV SWITCH OPEN
SSOV FAULT
DURING
PURGE
SSOV switch closed for 15 seconds during run.
SSOV FAULT
DURING RUN
OMM-0137_D • GF-211 • 7/16/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Corrective Action
Inspect Outdoor Temperature sensor for loose or broken wiring.
1.
Check resistance of sensor to determine if it is within specification.
2.
Ensure that the correct sensor is installed.
3.
1. Replace recirculation pump.
1. Check I/O Box to ensure signal is hooked up.
•
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.
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 the Remote
Signal parameter (Advanced Setup Unit  Application
Configuration).
Replace Flame Detector.
1.
Check open/close indicator window of Safety Shut-Off Valve (SSOV)
2.
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 not tilted inward
3.
toward burner head.
1. Replace actuator.
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