
AERCO ProtoNode Gateway
User Manual
Page 60 of 126 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0080_0H
11/06/2014 Ph.: 800-526-0288 GF-129
Appendix B.4: Water Heater Management System (WHM) and On-
Board Boiler Sequencing Technology (BST) Point Definitions
Appendix B.4: AERCO WHM and BST Point Definitions
Point Name
Data
GF-124,
GF-114
Point
Reg.
Type
Modbus Data
Address
(Hex/Dec.)
Units (Range)
WHM or BST Master
Write Control to WHM/BST 40051 Holding 50 Write “1” to send value to WHM/BST
Read WHM Timeout 40053 Holding 52 0 to
Read WHM Mode 30100 Input 99 0 = OFF, 1 = Slave, 2 = Master
Read WHM Setpoint 30101 Input 100 °F (40 to 200)
Read WHM Setback Setpoint 30102 Input 101 °F (40 to 200)
Read WHM Setback Time Start 30103 Input 102 12:00 AM to 11:59 PM (see note)
Read WHM Setback Time
End*
30104 Input 103 12:00 AM to 11:59 PM (see note)
Read Auto Master Status 30105 Input 104
0 = NO, 1 = YES
Read Average Outlet Temp. 30106 Input 105
°F (30 to 245)
Read # Units Active 30107 Input 106
0 to 8
Read # Units Faulted 30108 Input 107
0 to 8
Read WHM Master Address 30109 Input 108 0, 10-255
Write WHM Setback Setpoint
Write WHM Setback Time Start 40202 Holding 201 12:00 AM to 11:59 PM
Write WHM Setback Time End 40203 Holding 202 12:00 AM to 11:59 PM
WHM Heater or BST Boiler
Communication Address 3xx00 Input (x1) 0 to 127
Unit Status 3xx01 Input X00
0 = Disabled
1 = Standby
2 = Manual Operation
3 = Remote Operation
4 = Auto Operation
Fault Code 3xx02 Input X01
Fault codes 0-74 matching the C-
More fault codes.
Outlet Temperature 3xx03
Input X02 °F (30 to 245)
FFWD Temperature 3xx04
Input X03 °F (30 to 245)
Inlet Temperature 3xx05
Input X04 °F (30 to 245)
Exhaust Temperature 3xx06
Input X05 °F (50 to 550)
Inlet Air Temperature 3xx07
Input X06 °F (-70 to 245)
Flame Strength 3xx08
Input X07 % (0 to 100)
Fire Rate IN 3xx09
Input X08 % (0 to 100)
Fire Rate OUT 3xx10
Input X09 % (0 to 100)
Enum List (0 to 5 or 8) (see note)
Unit Size 3xx12
Input X11
Enum List (0 to 21) (see note)
Valve State 3xx13
Input X12
0 = Closed , 1 = Open
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