AERCO Control System (ACS) - Manual (Page 68)

MC2: 04/23/13 Page 68 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
4.2.1 Selecting Outdoor Reset Mode
The Outdoor Reset Mode is selected using the Header Set Mode option in the Field Adjust
Menu as shown below:
4.2.2 Determining Reset Schedule
There are two variables that must be considered when determining Reset Schedule: Reset
Ratio and Building Reference Temperature. There are two methods for determining the Reset
Ratio. The first method utilizes the Reset Ratio Charts provided in Appendix C. This method is
suitable for most installations. However, if a special Reset Schedule is desired for reheat or
other purposes, the calculation method must be used. When using this method, both Reset
Ratio and Building reference Temperature must be calculated. Refer to Appendix C for further
instructions concerning both of these methods.
Once the Reset Ratio and Building Reference Temperature have been determined, proceed to
the next paragraph and enter these options.
Selecting Outdoor Reset 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 first line of the VFD display. The second line of display will show the
currently selected Header Set Mode (CONSTANT SETPOINT, OUTDOOR RESET or
REMOTE SETPOINT).
3. If OUTDOOR RESET 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 OUTDOOR RESET.
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. While still in
the Field Adjust Menu, proceed to the next paragraph and continue the set-up procedure.