Watts AERCO Benchmark BMK5000 Operation And Service Manual page 140

Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Loose or broken wiring.
OUTDOOR 1.
TEMP
Defective Sensor.
2.
SENSOR
FAULT
Incorrect Sensor.
3.
1. Internal recirculation pump failed.
RECIRC PUMP
FAILURE
Remote setpoint signal not present:
1.
•
Not yet installed.
•
Wrong polarity.
•
Signal defective at source.
REMOTE
•
Broken or loose wiring.
SETPT
2. Signal is not isolated (floating) if 4 to 20 mA.
SIGNAL FAULT
Edge Controller signal type selection switches
3.
not set for correct signal type (voltage or current).
Defective Flame Detector.
1.
2. SSOV not fully closed.
RESIDUAL
FLAME
3. Wire strand from burner head in contact with
Flame Detector
See SSOV SWITCH OPEN
SSOV FAULT
DURING
PURGE
SSOV switch closed for 15 seconds during run.
SSOV FAULT
DURING RUN
OMM-0137_J • Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
12/20/2022
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.
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.
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 the Remote
Signal parameter (Advanced Setup→ Unit → Application
Configuration).
Replace Flame Detector.
1.
2. Check open/close indicator window of Safety 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.
3. Ensure Flame Detector is in good condition and is not tilted inward
toward burner head.
Replace actuator.
1.
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