Watts Benchmark Aerco OMM-0122 Installation And Start-Up Manual page 4

Benchmark 750-3000 Boiler Installation & Startup Manual
CONTENTS
5.7 FLAME FAULT TEST ..........................................................................................................90
5.8 AIR FLOW FAULT TESTS - BLOWER PROOF & BLOCKED INLET SWITCHES ..............91
5.8.1 Blower Proof Switch Test ............................................................................................................... 91
5.8.2 Blocked Inlet Switch Test................................................................................................................ 93
5.9 SSOV PROOF OF CLOSURE SWITCH CHECK ................................................................94
5.10 PURGE SWITCH OPEN DURING PURGE .......................................................................94
5.11 IGNITION SWITCH OPEN DURING IGNITION.................................................................97
5.12 SAFETY PRESSURE RELIEF VALVE TEST ....................................................................97
SECTION 6: BOILER SEQUENCING TECHNOLOGY ............................................ 99
6.1 INTRODUCTION.................................................................................................................99
6.1.1 Installation Notes ......................................................................................................................... 100
6.2 AERCO BST QUICK START CHART ............................................................................... 100
6.3 BST IMPLEMENTATION INSTRUCTION ......................................................................... 101
6.3.1 OPTION 1 - Constant Setpoint With Direct Wired Header Sensor ............................................... 101
6.3.2 OPTION 2 - Constant Setpoint With Modbus Wired Header Sensor ........................................... 102
6.3.3 OPTION 3 - Outdoor Reset With Direct Wired Header Sensor And Direct Wired Outdoor Sensor
............................................................................................................................................................... 103
6.3.4 OPTION 4 - Outdoor Reset With Modbus Header Sensor And Modbus Outdoor Sensor ............ 105
6.3.5 OPTION 5 - Remote Setpoint With Direct Wired Header Sensor And 4-20ma Setpoint Drive .... 107
6.3.6 OPTION 6 - Remote Setpoint With Direct Wired Header Sensor And Modbus Setpoint Drive ... 109
6.3.7 OPTION 7 - Remote Setpoint With Modbus Header Sensor And 4-20ma Setpoint Drive ........... 111
6.3.8 OPTION 8 - Remote Setpoint With Modbus Header Sensor And Modbus Setpoint Drive .......... 113
APPENDIX A: DIMENSIONAL AND CLEARANCE DRAWINGS ............................. 115
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 4 of 122