Aerco BMK 1500 User Manual page 111

FAULT INDICATION
RECIRC PUMP FAILURE
REMOTE SETPT
SIGNAL FAULT
RESIDUAL
FLAME
SSOV FAULT DURING
PURGE
SSOV FAULT
DURING RUN
SSOV RELAY
FAILURE
OMM-0097_0E
GF-142
Benchmark 1500 - 2000 Boilers
CHAPTER 8 – TROUBLESHOOTING GUIDE
TABLE 8-1: BOILER TROUBLESHOOTING – Continued
PROBABLE CAUSES
1. Internal recirculation pump failed.
Remote setpoint signal not present:
1.
Not yet installed.
Wrong polarity.
Signal defective at source.
Broken or loose wiring.
Signal is not isolated (floating) if 4
2.
to 20 mA.
Control Box signal type selection
3.
switches not set for correct signal
type (voltage or current).
1. Defective Flame Detector.
SSOV not fully closed.
2.
See SSOV SWITCH OPEN
SSOV switch closed for 15 seconds
during run.
1. SSOV relay failed on IGST board.
2. Floating Neutral.
Hot and Neutral reversed at SSOV.
3.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
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.
Check signal at source to ensure it is isolated.
2.
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
Configuration menu.
1. Replace Flame Detector.
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 2" Gas Shut-Off Valve downstream of SSOV (Figure 2-7).
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.
Replace or adjust micro-switch in SSOV actuator. If fault persists,
1.
replace actuator.
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.
Check SSOV power wiring.
3.
Ph.: 800-526-0288
CORRECTIVE ACTION
Page 111 of 182
10/01/2015