AERCO Control System (ACS) - Manual (Page 73)

MC2: 04/23/13 Page 73 of 144
GF-131
AERCO Control System (ACS)
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
Installation, Operation, and Maintenance Manual
OMM-0081_0D
4.3.3 Selecting Remote Signal Type
The boilers connected to the ACS can be controlled by either a 4-to-20 mA signal or a Modbus
signal from an Energy Management System (EMS). Remote Signal type is selected in the Field
Adjust Menu as shown below:
4.3.4 Selecting Boiler Operating Mode
The Boiler Plant can be set for either Parallel or Sequential Mode operation. The Boiler
Operating Mode is selected in the Configuration Menu as shown below:
Selecting Remote Signal Type
1. Using the ▲ or ▼ arrow key on the keypad, scroll through the menu until REMOTE
SIGNAL is displayed in the first line of the VFD display. The second line of the display
will show the currently selected Remote Signal (4-20 mA or MODBUS). The default is 4-
20 mA.
2. If the required REMOTE SIGNAL is not displayed in the second line of the display, press
the CHANGE key. The VFD display will switch to a reverse video format indicating that a
change is in process.
3. Using the ▲ or ▼ arrow key, toggle the display to the required signal type.
4. Press the
ENTER key to store the change. The reverse video display will revert to the
normal display format indicating that the change has been store in memory.
5. This completes all required entries in the Field Adjust Menu. To complete Remote
Setpoint Mode setup, select the Boiler Operating Mode option as shown at right.
Selecting Boiler Operating Mode
1. Using the keypad on the ACS, press the MENU key, until CONFIGURATION MENU
appears in the display.
2. On the keypad, press the ▲ arrow key once. BOILER OP MODE will be displayed in the
first line of the VFD display. The second line of the display will show the currently
selected Boiler Operating Mode. (SEQUENTIAL MODE or PARALLEL MODE). The
default setting is SEQUENTIAL MODE.
3. If the desired Operating Mode is not displayed in the second line of the display, press the
CHANGE key. The VFD display will switch to a reverse video format indicating that a
change is in process.
4. Using the ▲ or ▼ arrow key, toggle the display to the desired setting.
5. Press the
ENTER key to store the change. The reverse video display will revert to the
normal display format indicating that the change has been store in memory.
6. The ACS is now programmed for operation in Remote Setpoint Mode.