Benchmark 750-3000 Operation, Service & Maintenance Guide-Latin America
SECTION 3 – MODES OF OPERATION
OMM-0132A
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
31
of
162
GF-206-LA-LA
Ph.: 800-526-0288
01/02/2018
3.3.1 Setting the Setpoint
The setpoint temperature of the unit is adjustable from 40°F to 240°F (4.4°C to 115.6°C). To set
the unit for operation in the CONSTANT SETPOINT mode, you must set menu items
Internal
Setpt
and
Boiler Mode
in the
Configuration
menu as follows:
TABLE 3-1: Constant Setpoint Mode Settings
MENU OPTION
SETTING
Internal Setpt
Select desired setpoint using ▲ and ▼ arrow
keys (40°F to 240°F, 4.4°C to 115.6°C)
Boiler Mode
Constant Setpoint
See Section 2.3:
C-More Controller Menus
for detailed instructions on changing menu options.
3.4 REMOTE SETPOINT MODES
The unit’s setpoint can be remotely controlled by an Energy Management System (EMS) or
Building Automation System (BAS). The Remote Setpoint can be driven by a current or voltage
signal within the following ranges:
•
4-20 mA/1-5 VDC
•
0-20 mA/0-5 VDC
The factory default setting for the REMOTE SETPOINT mode is 4 - 20 mA/1 - 5 VDC. With this
setting, a 4 to 20 mA/1 to 5 VDC signal, sent by an EMS or BAS, is used to change the unit's
setpoint. The 4 mA/1V signal is equal to a 40°F (4.4°C) setpoint while a 20 mA /5V signal is
equal to a 240°F (115.6°C) setpoint. When a 0 to 20 mA/0 to 5 VDC signal is used, 0 mA is
equal to a 40°F (4.4°C) setpoint.
In addition to the current and voltage signals described above, the REMOTE SETPOINT mode
can also driven by a RS-485 Modbus Network signal from an EMS or BAS.
The REMOTE SETPOINT modes of operation can be used to drive single as well as multiple
units.
NOTE:
If a voltage, rather than current signal is used to control the remote setpoint, a DIP switch
adjustment must be made on the PMC Board located in the C-More Controller. Contact your
local AERCO representative for details.
In order to enable the REMOTE SETPOINT mode, you must set menu items
Boiler Mode
and
Remote Signal
in the
Configuration
menu as follows:
TABLE 3-2: Remote Setpoint Mode Settings
MENU OPTION
SETTING
Boiler Mode
Remote Setpoint
Remote Signal
4-20mA/1-5V, 0-20mA/0-5V, or Network
Refer to section 2.3:
C-More Controller Menus
for detailed instructions on changing menu
options.