8.4 O
2
SENSOR 135
8.4.1 Air Eductor Air Pump Maintenance – BMK5000 & 6000 ............................................................................ 136
8.5 SAFETY DEVICE TESTING ............................................................................................................... 137
8.6 BURNER INSPECTION ...................................................................................................................... 137
8.7 CONDENSATE DRAIN TRAP ............................................................................................................ 140
8.8 AIR FILTER CLEANING AND REPLACEMENT ................................................................................ 141
8.9 REFRACTORY REPLACEMENT – BMK5000 & 6000 ONLY............................................................................ 141
8.10 SHUTTING BOILER DOWN FOR EXTENDED PERIOD ................................................................. 142
8.10.1 Benchmark 5000/6000 Long Term Blower Storage ................................................................................... 142
8.11 RETURNING THE BOILER TO SERVICE AFTER SHUTDOWN .................................................... 144
8.12 RECOMMENDED PERIODIC TESTING .......................................................................................... 144
8.13 RECOMMENDED SPARES ............................................................................................................. 146
SECTION 9. TROUBLESHOOTING .................................................................. 147
9.1 INTRODUCTION ................................................................................................................................. 147
9.2 ADDITIONAL FAULTS WITHOUT SPECIFIC FAULT MESSAGES .................................................. 158
APPENDIX A: WIRING SCHEMATICS ................................................................. 159
A-1: BENCHMARK 750 – 2000 SCHEMATICS .............................. ERROR! BOOKMARK NOT DEFINED.
A-2: BENCHMARK 2500 – 3000 SCHEMATICS ...................................................................................... 162
A-3: BENCHMARK 4000 – 5000N SCHEMATICS ................................................................................... 166
A5: BENCHMARK 5000 – 6000 SCHEMATICS ............................ ERROR! BOOKMARK NOT DEFINED.
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