AERCO Control System (ACS) - Manual (Page 77)

MC2: 04/23/13 Page 77 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
set to TEMP ONLY, the outdoor temperature is the only criteria used to activate the system. In
this case the system, and the System Start Relay, will activate when the outdoor temperature
falls below the SYS START TEMP setting. If no outdoor sensor is installed, the system (and the
System Start Relay) will always be activated in this case. The system will shut down and the
System Start Relay deactivated when the outdoor temperature rises above the SYS START
TEMP setting.
If the SYS START OPTION is set to TEMP AND LOAD, the system (and the System Start
Relay) will start when the outdoor temperature is below the SYS START TEMP setting and the
load demand (PERCENT OF LOAD) is at or above the LOAD START PCT (in Calibration
Menu). The PERCENT OF LOAD display in the Operating Menu will show 0% until both of
these criteria are satisfied. The system will shut down and the System Start Relay deactivated if
either the outdoor temperature rises above the SYS START TEMP or the PERCENT OF LOAD
falls below the LOAD STOP PCT. If no outdoor sensor is installed, the system (and the System
Start Relay) will activate when the PERCENT OF LOAD is at or above the LOAD START PCT.
The system will shut down when the PERCENT OF LOAD falls below the LOAD STOP PCT.
4.6 “Start Enabled” Option
The ACS can be used to turn on and prove a device such as a fresh air damper, gas booster or
the flow of a local pump before ramping up the output. With SYS INTLK CONFIG
(Configuration Menu) set to START ENABLED, the ACS will allow 30 seconds after it activates
the System Start Relay before proving the selected interlock (such as SYS START INTLK) and
ramping up the output. The System Start Relay can activate the device and the dry-contact
proving switch of the device, or devices can be wired to one or both interlocks.
4.7 System Initialization and Polling
In order for the ACS to recognize the boilers connected to the RS485 Network, Initialization and
polling must be accomplished by performing the steps shown below:
The ACS will continuously poll the boilers at prescribed intervals. Therefore, if a boiler is placed
off-line and then placed back on-line, it will again be recognized by the ACS during the next
polling cycle.
System Initialization and Polling
1. Set the ON/OFF switch on each boiler control panel to ON.
2. Turn on the ACS by pressing the ON key. The ACS will automatically poll (recognize)
each boiler at prescribed intervals.
3. Check the yellow REMOTE (REM) LED on each boiler control panel to ensure it is ON.
This indicates that the boiler is now being controlled by the ACS. On the BCM of the
Modulex boilers, the yellow LED should be on and NOT flashing.
4. If any of the boiler REMOTE LEDs are off, check to ensure that:
a. Boiler AC power is not turned off
b. Boiler is not shut down due to a fault.
c. The RS485 Network connection is not broken.
d. Each C-More or BCM is set to a unique address.
e. The ACS is programmed with the correct C-More or BCM addresses.