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Benchmark 750-3000 Boiler Installation & Startup Manual
CONTENTS
2.12 FLUE GAS VENT INSTALLATION ....................................................................................39
2.12.1 MASSACHUSETTS INSTALLATIONS ............................................................................................... 39
2.13 COMBUSTION AIR ...........................................................................................................40
2.13.1 DUCTED COMBUSTION AIR .......................................................................................................... 40
2.14 BENCHMARK PUMP RELAY ...........................................................................................41
2.15 SEQUENCING ISOLATION VALVE INSTALLATION ........................................................42
SECTION 3: START SEQUENCE ........................................................................ 45
3.1 INTRODUCTION.................................................................................................................45
3.2 START SEQUENCE ...........................................................................................................45
3.3 START/STOP LEVELS .......................................................................................................51
3.4 START/STOP LEVELS – AIR/FUEL & ENERGY INPUT .....................................................52
3.4.1 BMK 750/1000 Air/Fuel Valve Position and Energy Input ............................................................. 52
3.4.2 BMK 1500 Air/Fuel Valve Position and Energy Input ..................................................................... 53
3.4.3 BMK 2000 Air/Fuel Valve Position and Energy Input ..................................................................... 54
3.4.4 BMK 2500 Air/Fuel Valve Position and Energy Input ..................................................................... 55
3.4.5 BMK 3000 Air/Fuel Valve Position and Energy Input ..................................................................... 56
SECTION 4: INITIAL START-UP ........................................................................ 57
4.1 INITIAL START-UP REQUIREMENTS ................................................................................57
4.2 TOOLS & INSTRUMENTS FOR COMBUSTION CALIBRATION ........................................57
4.2.1 Required Tools & Instrumentation ................................................................................................. 57
4.2.2 Installing Gas Supply Manometer .................................................................................................. 58
4.2.3 Accessing the Analyzer Probe Port ................................................................................................. 60
4.3 FUEL TYPES AND COMBUSTION CALIBRATION ............................................................61
4.4 COMBUSTION CALIBRATION ...........................................................................................62
4.4.1 NATURAL GAS Combustion Calibration .......................................................................................... 63
4.4.2 PROPANE GAS COMBUSTION CALIBRATION .................................................................................. 67
4.5 REASSEMBLY ....................................................................................................................71
4.6 DUAL FUEL SWITCHOVER ...............................................................................................71
4.6.1 Switchover from NATURAL GAS to PROPANE ................................................................................ 72
4.6.2 Switchover from PROPANE to NATURAL GAS ................................................................................ 73
4.7 OVER-TEMPERATURE LIMIT SWITCHES ........................................................................74
4.7.1 Digital Alarm Switch Checks and Adjustments ............................................................................... 75
SECTION 5: SAFETY DEVICE TESTING .............................................................. 77
5.1 TESTING OF SAFETY DEVICES .......................................................................................77
5.2 LOW GAS PRESSURE TEST .............................................................................................78
5.2.1 LOW GAS PRESSURE TEST: BMK 750 – 2500 .................................................................................. 78
5.2.2 LOW GAS PRESSURE TEST: BMK 3000 Only.................................................................................... 80
5.3 HIGH GAS PRESSURE TEST ............................................................................................82
5.3.1 HIGH GAS PRESSURE TEST: BMK 750 – 2500 ................................................................................. 82
5.3.2 HIGH GAS PRESSURE TEST: BMK 3000 Only ................................................................................... 84
5.4 LOW WATER LEVEL FAULT TEST ....................................................................................86
5.5 WATER TEMPERATURE FAULT TEST .............................................................................87
5.6 INTERLOCK TESTS ...........................................................................................................89
5.6.1 Remote Interlock Test .................................................................................................................... 89
5.6.2 Delayed Interlock Test .................................................................................................................... 89
OMM-0121_D • GF-205 • 5/9/2019
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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