AERCO Control System (ACS)
CHAPTER 4
: Programing ACS Operating Modes
11/22/2017
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
Page 77 of 139
OMM-0081_0F
Phone: 800-526-0288
GF-131
“Temp and Load” Option
4.5
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
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.
“START ENABLED” OPTION
4.6
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.
SYSTEM INITIALIZATION AND POLLING
4.7
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:
Performing 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:
•
Boiler AC power is not turned off
•
Boiler is not shut down due to a fault.
•
The RS485 Network connection is not broken.
•
Each C-More or BCM is set to a unique address.
•
The ACS is programmed with the correct C-More or BCM addresses.
