AERCO Control System (ACS)
CHAPTER 3
: Operation
11/22/2017
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
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Phone: 800-526-0288
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terminals. Up to 32 Boilers can be connected to the Network (default = 02).
3.7.5 MODBUS CNTL TYPE
This menu option sets the Modbus Control Type to
ROUND ROBIN
or
BROADCAST
. Only
ROUND ROBIN
can be used at this time. When set to ROUND ROBIN, each networked boiler
is addressed individually in sequence.
BROADCAST
is currently not used for the ACS.
3.7.6 NETW BOILER Xx ADDRESS=Yyy
Up to 32 Network Boilers can be accommodated on the Modbus Network (Where Xx = 01 – 32
and Yyy = 001 – 127). Each Boiler must be assigned a unique address on the network ranging
from 001 to127. No addresses should be entered if automatic boiler detection is desired. Simply
set the
MIN SLAVE ADDR
and
MAX SLAVE ADDR
to the minimum and maximum address
range of the boilers. To program boiler addresses in the order you desire, enter them here and
set the
MIN SLAVE ADDR
and
MAX SLAVE ADDR
to zero.
FIELD ADJUST MENU
3.7
The
FIELD ADJUST MENU
contains the most extensive list of options compared to the other 8
Menu categories. The options in this menu allow you to adjust important parameters to suit the
specific needs of your ACS installation. Included are options to select the Header Mode and
Temperature Limits, Internal Setpoint, Building Reference Temperature, Reset Ratio and
Remote Signal. In addition, the Field Adjust Menu contains a series of options which can be
used to set up a Header Setpoint Offset Schedule for an entire week. Descriptions of the Field
Adjust Menu options:
3.8.1 HEADER SET MODE
The
HEADER SET MODE
option sets the Header Setpoint selection method for the ACS.
Allowable selections are: CONSTANT SETPT, OUTDOOR RESET or REMOTE SETPT.
(Default = CONSTANT SETPT).
3.8.2 HDR HIGH LIMIT
The
HDR HIGH LIMIT
option sets the maximum temperature setting allowed for the Header
Setpoint. This setting also defines the 20 mA temperature equivalent when operating in the
Remote Setpoint Mode using a 4 – 20 mA signal. The allowable setting range is from the
HDR
LOW LIMIT
to 220°F. (Default = 200°F).
3.8.3 HDR LOW LIMIT
The
HDR LOW LIMIT
menu option sets the minimum temperature setting allowed for the
Header Setpt. This setting also defines the 4 mA temperature equivalent when operating in the
Remote Setpoint Mode using a 4 – 20 mA signal. The setting range is from 40°F to the
HDR
HIGH LIMIT
. (Default = 40°F).
3.8.4 INTERNAL SETPT
The
INTERNAL SETPT
temperature is the
HEADER SETPT
used when
CONSTANT SETPT
is
selected for the
HEADER SET MODE
or when the ACS operates in the Failsafe Mode and
CONSTANT SETPT
is selected as the FAIL SAFE MODE setting in the Configuration Menu.