AERCO BMK 6000 User Manual
Page 122
Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
Page 122 of 210
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
OMM-0086_0D
03/20/14
Ph.: 800-526-0288
GF-133
TABLE 8-1: BOILER TROUBLESHOOTING – Continued
FAULT INDICATION
PROBABLE CAUSES
CORRECTIVE ACTION
REMOTE SETPT
SIGNAL FAULT
1.
Remote setpoint signal not
present:
Not yet installed.
Wrong polarity.
Signal defective at source.
Broken or loose wiring.
2.
Signal is not isolated (floating) if 4
to 20 mA.
3.
Control Box signal type selection
switches not set for correct signal
type (voltage or current).
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.
2.
Check signal at source to ensure it is isolated.
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 Configuration Menu.
RESIDUAL
FLAME
1.
Defective Flame Detector.
2.
SSOV not fully closed.
1.
Replace Flame Detector.
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 2” Gas Shut-Off Valve downstream of SSOV (Figure
8-1). 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.
SSOV FAULT DURING
PURGE
See SSOV SWITCH OPEN
SSOV FAULT
DURING RUN
SSOV switch closed for 15 seconds
during run.
1.
Replace or adjust micro-switch in SSOV actuator. If fault
persists, replace actuator.
SSOV RELAY
FAILURE
1.
SSOV relay failed on IGST board.
2.
Floating Neutral.
3.
Hot and Neutral reversed at SSOV.
1.
Press CLEAR button and restart unit. If fault persists,
replace Ignition/Stepper (IGST) Board.
2.
The Neutral and Earth Ground are not connected 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.
3.
Check SSOV power wiring.