Benchmark 750-3000 Installation & Startup Manual
CONTENTS
OMM-115_D
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GF-200
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5/9/2019
Technical Support
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(800) 526-0288
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Mon-Fri, 8 am - 5 pm EST Page 2 of 126
TABLE OF CONTENTS
SAFETY PRECAUTIONS ................................................................... 9
– FOR MASSACHUSETTS INSTALLATIONS ............................................... 11
INSTALLATION ............................................................................. 13
2.4.1 Installation Clearances ................................................................................................................... 14
2.4.2 Setting the Unit .............................................................................................................................. 17
2.9.1 Gas Supply Specifications ............................................................................................................... 27
2.9.2 Manual Gas Shutoff Valve .............................................................................................................. 27
2.9.3 External Gas Supply Regulator ....................................................................................................... 28
2.10.1 Electrical Power Requirements .................................................................................................... 30
2.10.2 Power Box Locations .................................................................................................................... 31
2.10.3 Electrical Power Box Internal Components .................................................................................. 32
2.11.1 Outdoor Air & Air Sensor Common .............................................................................................. 35
2.11.2 AIR TEMP SENSOR ........................................................................................................................ 36
2.11.3 O
2.11.5 ANALOG IN ................................................................................................................................... 36
2.11.6 VALVE FEEDBACK .......................................................................................................................... 37
2.11.7 SHIELD (SHLD & SHLD) .................................................................................................................. 37
2.11.8 ANALOG OUT ................................................................................................................................ 37
2.11.9 RS485 Comm (+, GND, & -) ........................................................................................................... 37
2.11.10 RS232 Comm (TxD & RxD) .......................................................................................................... 37
2.11.11 VFD/Blower (0-10 & AGND) ....................................................................................................... 37
2.11.12 Interlocks .................................................................................................................................... 38
2.11.13 Fault Relay (NC, COM, & NO) ..................................................................................................... 38