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Benchmark 750-3000 Boiler Operation & Maintenance Manual
SECTION 3 – MODES OF OPERATION
3.7.1 Combination Control System Field Wiring
Wiring for this system is between the ACS, the ACS Relay Box, and the terminals in the I/O
Box. Wire the units using a shielded twisted pair of 18 to 22 AWG wire. When wiring multiple
units, each unit's wiring must conform to the above.
3.7.2 Combination Control System Setup and Startup
Setup for the COMBINATION mode requires entries to be made in the Configuration menu for
boiler mode, remote signal type and setpoint (see Section 2.6: Configuration Menu for details).
The setpoint is adjustable from 40°F to 190°F (4.4°C to 87.8°C).
To enable the COMBINATION mode, you must set menu items Boiler Mode, Remote Signal
and Internal Setpt in the Configuration menu as follows:
TABLE 3-5: Combination Mode Settings
MENU OPTION
SETTING
Boiler Mode
Combination
Remote Signal
Network
Internal Setpt
40°F to 190°F (4.4°C to 87.8°C)
Refer to section 2.3: C-More Controller Menus for instructions on changing menu options.
While it is possible to change other temperature-related functions for COMBINATION mode,
these functions are preset to their factory default values. These default settings work well in
most applications. It is suggested that AERCO be contacted prior to changing settings other
than the unit's setpoint. For a complete listing of temperature related function defaults, see
Sections 2.4 – 2.10.
To set the unit to the MANUAL mode, press the AUTO/MAN switch. The MANUAL LED will
light.
To set the unit back to the AUTO mode, press the AUTO/MAN switch. The MANUAL LED will
go off and the REMOTE LED will light.
When the boiler is switched to ACS control, the ACS controls the valve position. There are no
setup requirements to the boiler(s) in this mode.
OMM-0122_D • GF-206 • 5/9/2019
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 38 of 164
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