AERCO Control System (ACS)
APPENDIX H:
ACS Modbus Address Assignments
Page 134 of 139
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
11/22/2017
GF-131
Phone: 800-526-0288
OMM-0081_0F
TABLE H2: ACS Standard Holding Register Address Mapping
Modbus Data
Address
Decimal (Hex)
Menu Item
Units and Range
Default/
Comments
136 (0x0088)
Return Sensor Offset
-10.0°F to 10.0°F
Default = 0
137 (0x0089)
Load Start Pct
1 to Blr Start Level
Default = 1
138 (0x008A)
Load Stop Pct
0 to Load Start Pct - 1
Default = 0
139 (0x008B)
PASS THROUGH WRITE
ENABLE
0 = Disabled
1 = Enabled
Default = 0
140 (0x008C)
LEAD BOILER SELECT
0 (None) or 1
Default = 0
141 (0x008D)
LAST BOILER SELECT
0 (None) or 1 - 32
Default = 0
142 (0x008E)
ROTATE TIME
0 to 999 hrs
Default = 168 hrs
143 (0x008F)
NUMBER OF DHW BOILERS
0 to 8
Default = 1
144 (0x0090)
DHW OPTION
0 to 3
3 = No Option
0 = Option 1 (1 Valve)
1 = Option 2 (2 Valve)
2 = Option 3 (Boost)
Default = 3
145 (0x0091)
SYSTEM RELAY OPTION
0 or 1
0 = Normal
1 = DHW Valve 1 Close
Default = 0
146 (0x0092)
NUMBER DHW PRIORITY
O to Num DHW Boilers - 1
Default = 1
147 (0x0093)
DHW SIGNAL
0 or 1
0 = No Signal
1 = Special Signal
Default = 0
148 (0x0094)
RETURN SENSOR MODE
0 to 2
0 = Off
1 = Normal (Return Sensor)
2 = DHW/Tank Temp
Default = 0
149 (0x0095)
HIGH DB SETPT ENABLE LEVEL Blr Stop Level to 100%
Default = Blr Stop Level
150 (0x0096)
DEADBAND HIGH
0 to 25°
Default = 1°
151 (0x0097)
DEADBAND LOW
0 to 25°
Default = 1°
152 (0x0098)
SETPOINT DOWN RATE
0 to 100°/Min
Default = 100°
153 (0x0099)
DEMAND OFSET
0 to 100°
Default = 0°
154 (0x009A)
PLANT DT LIMIT
10 to 100°
Default = 40°
155 (0x009B)
BOILER DELAY TIME
10 to 999 Sec
Default = 30