Remote Setpoint Mode; Direct Drive Modes - Watts AERCO Edge CFR 3000 Operator's And Service Manual

SECTION 6 STANDALONE MODES OF OPERATION

6.3 Remote Setpoint Mode

The 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.
NOTE: For field wiring instructions see Section 2.10 in the CFR Boiler Install-Startup Manual (OMM-0163).
When using the Remote Setpoint mode default setting, 4 - 20 mA/1 - 5 VDC, 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
Setpoint Low Limit, while a 20 mA /5V signal is equal to a Setpoint High Limit setpoint. When a 0 to 20
mA/0 to 5 VDC signal is used, 0 mA is equal to Setpoint Low Limit.
In addition to the current and voltage signals described above, the Remote Setpoint mode can also be
driven by a RS-485 Modbus Network signal from an EMS or BAS.
The Remote Setpoint mode 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 in the Edge Controller. Contact AERCO for details.
To set the unit to Remote Setpoint mode:
Main Menu →Advanced Setup → Unit →Application Configuration.
1. Go to
2. Press SH Operating Mode and choose Remote Setpt.
3. Set the Remote Setpoint parameter to one of the following:
•
4-20mA
•
1-5V
•
BAS
If Network is selected for RS-485 Modbus operation, a valid Comm Address must be entered in the
Setup menu. Refer to the Edge Controller Communication Manual (OMM-0140) for information.
While it is possible to change the values of temperature related functions, the unit is factory preset with
values that work well in most applications. It is suggested that an AERCO representative be contacted
prior to changing any temperature related function values.

6.4 Direct Drive Modes

The unit's air/fuel valve position (% open) can be changed by a remote signal which is typically sent from
an Energy Management System (EMS) or from a Building Automation System (BAS). The Direct Drive
mode can be driven by a current or voltage signal.
The default setting for the Direct Drive mode is 4-20 mA/1-5 VDC. With this setting, a 4 to 20 mA signal,
sent by an EMS or BAS is used to change the unit's valve position from 0% to 100%. A 4 mA/1V signal is
equal to a 0% valve position, while a 20 mA /5V signal is equal to a 100% valve position. When a 0-20
mA/0-5 VDC signal is used, zero is equal to a 0% valve position.
In addition to the current and voltage signals described above, the Direct Drive mode can also be driven
by a RS-485 Modbus Network signal from an EMS or BAS. When in Direct Drive mode, the unit is a slave
to the EMS or BAS and does not have a role in temperature control. Direct Drive can be used to drive
single, or 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 CPU Board located in the Edge Controller. Contact your AERCO representative for details.
To enable the Direct Drive mode:
•
•
0-20mA
•
Network
•
0-5V
• •