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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
3.7 TUNING MENU ................................................................................................................................. 42
3.8 COMBUSTION CAL MENU .............................................................................................................. 43
3.9 BST (Boiler Sequencing Technology) Menu ..................................................................................... 44
3.10 START SEQUENCE ........................................................................................................................ 46
3.11 START/STOP LEVELS ................................................................................................................... 50
CHAPTER 4. INITIAL START-UP ............................................................................................................. 53
4.1 INITIAL START-UP REQUIREMENTS ............................................................................................. 53
4.2 TOOLS AND INSTRUMENTATION FOR COMBUSTION CALIBRATION ....................................... 53
4.2.1 Required Tools & Instrumentation ................................................................................................................................. 53
4.2.2 Installing Gas Supply Manometer ................................................................................................................................. 54
4.2.3 Accessing the Analyzer Probe Port ............................................................................................................................... 55
4.3 NATURAL GAS COMBUSTION CALIBRATION .............................................................................. 56
4.4 PROPANE GAS COMBUSTION CALIBRATION .............................................................................. 60
4.5 REASSEMBLY .................................................................................................................................. 63
4.6 DUAL-FUEL SWITCHOVER INSTRUCTIONS ................................................................................. 64
4.6.1 Switchover from NATURAL GAS to PROPANE ........................................................................................................... 64
4.6.2 Switchover from PROPANE to NATURAL GAS ........................................................................................................... 65
4.7 OVER-TEMPERATURE LIMIT SWITCHES...................................................................................... 66
4.7.1 Digital Alarm Switch Checks and Adjustments ............................................................................................................. 66
CHAPTER 5. MODE OF OPERATION ..................................................................................................... 69
5.1 INTRODUCTION ............................................................................................................................... 69
5.2 INDOOR/OUTDOOR RESET MODE ................................................................................................ 69
5.2.1 Reset Ratio ................................................................................................................................................................... 69
5.2.2 Building Reference Temperature .................................................................................................................................. 69
5.2.3 Outdoor Air Temperature Sensor Installation ................................................................................................................ 69
5.2.4 Indoor/Outdoor Startup ................................................................................................................................................. 69
5.3 CONSTANT SETPOINT MODE ........................................................................................................ 70
5.3.1 Setting the Setpoint ....................................................................................................................................................... 70
5.4 REMOTE SETPOINT MODES .......................................................................................................... 70
5.4.1 Remote Setpoint Field Wiring ....................................................................................................................................... 71
5.4.2 Remote Setpoint Startup ............................................................................................................................................... 71
5.5 DIRECT DRIVE MODES ................................................................................................................... 72
5.5.1 Direct Drive Field Wiring ............................................................................................................................................... 72
5.5.2 Direct Drive Startup ....................................................................................................................................................... 72
5.6 AERCO CONTROL SYSTEM (ACS) ................................................................................................ 73
5.6.1 ACS External Field Wiring ............................................................................................................................................. 73
5.6.2 ACS Setup and Startup ................................................................................................................................................. 73
5.7 COMBINATION CONTROL SYSTEM (CCS).................................................................................... 73
5.7.1 Combination Control System Field Wiring .................................................................................................................... 74
5.7.2 Combination Control System Setup and Startup .......................................................................................................... 74
CHAPTER 6. SAFETY DEVICE TESTING ............................................................................................... 77
6.1 TESTING OF SAFETY DEVICES ..................................................................................................... 77
6.2 LOW GAS PRESSURE FAULT TEST .............................................................................................. 78
6.3 HIGH GAS PRESSURE TEST .......................................................................................................... 79
6.4 LOW WATER LEVEL FAULT TEST ................................................................................................. 80
6.5 WATER TEMPERATURE FAULT TEST ........................................................................................... 81
6.6 INTERLOCK TESTS ......................................................................................................................... 82
6.6.1 Remote Interlock Test ................................................................................................................................................... 82
6.6.2 Delayed Interlock Test .................................................................................................................................................. 82
6.7 FLAME FAULT TESTs ...................................................................................................................... 83
6.8 AIR FLOW FAULT TESTS ................................................................................................................ 84
6.8.1 Blower Proof Switch Test .............................................................................................................................................. 84
6.8.2 Blocked Inlet Switch Test .............................................................................................................................................. 84
6.9 SSOV PROOF OF CLOSURE SWITCH ........................................................................................... 86
6.10 PURGE SWITCH OPEN DURING PURGE .................................................................................... 87
6.11 IGNITION SWITCH OPEN DURING IGNITION .............................................................................. 87
Page 4 of 234
05/21/2014
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
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