AERCO Control System (ACS) - Manual (Page 134)

MC2: 04/23/13 Page 134 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
H.2 ACS CONTROLLER STANDARD HOLDING REGISTER
ASSIGNMENTS
The Holding Register address assignments for the ACS are listed in Table H-2 which follows. Unless
otherwise specified, all Holding Register Menu items are Read/Write (R/W).
Table H-2: ACS Standard Holding Register Address Mapping
Modbus Data
Address
Decimal (Hex)
Menu Item Units and Range
Default/
Comments
0 (0x0000)
thru
3 (0x0003)
(Reserved)
4 (0x0004)
Net Header Set
Temp
40 to 220°F
Valid when Hdr Set
Mode=Remote Setpt
and Remote Signal =
Network
5 (0x0005) System Start Temp 32 to 120°F Default = 70°F
6 (0x0006) System Start Option
0 or 1
0 = Temp Only,
1 = Temp and Load
Default = 0
7 (0x0007)
Manual Hdr Set
Temp/Internal Setpt 40 to 220°F
Default = 160°F
8 (0x0008) Bldg Ref Temp 40 to 220°F Default = 70°F
9 (0x0009) Not Applicable
10 (0x000A) Not Applicable
11 (0x000B) Reset Ratio
0.3 to 3.0
(0.1 increments),
Default = 1.2
(Value x 10)
12 (0x000C) Max Header Temp 40 to 220°F Default = 200°F
13 (0x000D) Min Header Temp 40 to 220°F Default = 40°F
14 (0x000E) Start Percent 25 to 100% Default = 20%
15 (0x000F) Stop Percent 10 to 45% Default = 16%
16 (0x0010) Integral Gain
0.00 to 9.99 Rep/Min
(in 0.01 increments
Default = 0.15 Rep/Min
(Value x 100)
17 (0x0011) Header Set Mode
0, 1, or 2
0 = Constant Setpt
1 = In/Outdoor Reset
2 = Remote Setpt
Default = 0
(Constant Setpt))