Setting The Setpoint; Remote Setpoint Modes - Watts Aerco BENCHMARK 750 User Manual

Benchmark 750 – 1000 Boiler User Manual - INTERNATIONAL

5.3.1 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, the following menu settings must be
made in the Configuration menu:
Table 5-1: Constant Setpoint Mode Settings
Menu Option
Boiler Mode
Internal Setpt
Refer to section 3.3 for detailed instructions on changing menu options.

5.4 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.
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 Control Panel Assembly. Contact your
local AERCO representative for details.
In order to enable the REMOTE SETPOINT mode, the following menu setting must be made in
the Configuration menu:
Menu Option
Boiler Mode
Remote Signal
Refer to section 3.3 for detailed instructions on changing menu options.
If the Network setting is selected for RS-485 Modbus operation, a valid Comm Address must be
entered in the Setup menu.
OMM-0119_0A
GF-130-I
CHAPTER 5 – MODE OF OPERATION
Setting
Constant Setpoint
Select desired setpoint using ▲ and ▼ arrow keys
(40°F to 240°F,
NOTE
Table 5-2: Remote Setpoint Mode Settings
Setting
Remote Setpoint
4-20mA/1-5V, 0-20mA/0-5V, or Network
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
4.4°C to 115.6°C)
Page 67 of 170
11/03/2016