AERCO Control System (ACS) - Manual (Page 76)

MC2: 04/23/13 Page 76 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
4.4.3 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:
4.4.4 Entering Boiler Start and Boiler Stop Levels
The Boiler (BLR) Start and Boiler Stop Levels are also entered in the Configuration Menu. Refer
to Appendix I to determine the correct Start and Stop levels for your installation. Enter the
appropriate values in the Configuration Menu as shown below:
4.5 “Temp and Load” Option
The boiler plant, and the System Start Relay, can be programmed to start based on either, or
both, an outdoor temperature and/or load demand criteria. When the SYS START OPTION is
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 the Constant Setpoint Mode.
Entering Boiler Start and Boiler Stop Levels
1. Using the ▲ or ▼ arrow key on the keypad, scroll through the Configuration Menu until
BLR START LEVEL is displayed along with the current setting (default = 20%).
2. If the desired Boiler Start Level is not displayed, press the CHANGE key. The display will
switch to a reverse video format.
3. Select the desired Boiler Start Level using the ▲ or ▼ arrow key.
4. Press the
ENTER key to store the changed Start Level.. The reverse video display will
revert to the normal VFD display format.
5. Next, scroll through the menu until the BLR STOP LEVEL is displayed along with the
current setting (default = 16%).
6. If the desired Boiler Stop Level is not displayed, repeat steps 2, 3 and 4 above for the
desired Stop Level.