AERCO Control System (ACS) - Manual (Page 71)

MC2: 04/23/13 Page 71 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 REMOTE SETPOINT MODE
In order to set up the ACS to operate in this mode, a Modbus communication line or a 4-to-20
mA input line with a floating ground from an Energy Management System (EMS) is required. In
addition, a ACS header sensor is required. This mode may be used with or without an outdoor
air temperature sensor installed. Entries in this mode are required for the following menu items:
FIELD ADJUST MENU
HEADER SET MODE
HEADER HIGH LIMIT
HEADER LOW LIMIT
REMOTE SIGNAL
CONFIGURATION MENU
BOILER OPERATING MODE
BLR START LEVEL
BLR STOP LEVEL
The programming set-up instructions for the above menu options are provided in paragraphs
which follow.
4.3.1 Selecting Remote Setpoint Mode
The Remote Setpoint Mode is selected using the Header Set Mode option in the Field Adjust
Menu as shown below:
Selecting Remote Setpoint Mode
1. Using the keypad on the ACS, press the MENU key, until FIELD ADJUST MENU
appears in the display.
2. Using the ▲ or ▼ arrow key on the keypad, scroll through the menu until HEADER SET
MODE is displayed in the first line of the VFD display. The second line of the display will
show the currently selected Header Set Mode (CONSTANT SETPOINT, OUTDOOR
RESET or REMOTE SETPOINT).
3. If REMOTE SETPOINT 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, select REMOTE SETPOINT.
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. With the
ACS still in the FIELD ADJUST MENU, proceed to the next paragraph and continue the
set-up procedure.