AERCO Control System (ACS) - Manual (Page 61)

MC2: 04/23/13 Page 61 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
FAULTS. If NO INTERLOCK is selected, the Fault Alarm Relay will not activate when the
interlocks are opened, however the ACS will still shut down all boilers. If INTERLOCK 2 is
selected, the Fault Alarm Relay will only activate when Interlock 2 is opened and not when
Interlock 1 is opened. Similarly, when INTERLOCK 1 is selected, the fault alarm relay will only
activate when Interlock 1 is opened and not when Interlock 2 is opened.
3.12.7 FAULT ALARM BLRS
This selection tells the ACS whether to activate the fault alarm relay if a boiler connected to it is
faulted.
3.12.8 FAULT ALRM CLEAR
Selecting MANUAL will latch the fault alarm relay if a fault condition occurs and goes away. The
CLEAR key must be pushed to deactivate the relay. If set to AUTOMATIC, the fault relay will
open when the fault condition goes away.
3.13 CALIBRATION MENU
The options contained in this Menu should only be used by factory-trained personnel, since it
contains options that could adversely affect system operation if incorrectly set.
NOTE
The Level 2 Password ( 6817) must be entered in order to view or
change options in the Calibration Menu.
3.13.1 HDR SENS OFFSET
This option sets the offset temperature value that is added to the displayed Header Sensor
temperature in the event that it is different from a trusted reference Header temperature reading
and needs calibration. Be sure the Header Sensor is properly installed before adjusting this
offset value. The allowable offset range is ±10°F
3.13.2 OUTD SENS OFFSET
This offset value is added to the Outdoor Sensor temperature displayed in case it is different
from a trusted reference outdoor temperature reading and needs calibration. Be sure the
Outdoor sensor is properly installed before adjusting this value. The allowable offset range is
±10°F.
3.13.3 4 - 20 MA OFFSET
This offset value is added to the 4 – 20 mA Remote signal input to the ACS in the event that
calibration is needed. The allowable offset range is ±1.0 mA.
3.13.4 RETN SENS OFFSET
This offset value is added to the Return Sensor temperature displayed in case it is different from
a trusted reference return temperature reading and needs calibration. Be sure the Return
Sensor is properly installed before adjusting this value. The allowable offset range is ±10°F
3.13.5 RAMP UP %/MIN
This sets the maximum Percent Level ramp up rate for the ACS. The Percent Level output will
follow the PID output if it is slower than this rate. The default setting is 20% per minute. Refer to
the following example: