ICC Mirius, Installation Instructions Manual

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Modbus / Gas Water Heaters
Table 38. ModBus Gas Water Heaters Register List
Register Name
(Description) Register Type Address R/W Units
Min
Value
(if W)
Max
Value
(if W)
MXi Low Temperature Input Status 237 R 0=Temp OK
1=Low Temp
MXi Leak Detected Input Status 238 R 0=No Leak
1=Leak Detected
MXI Heater Enable Switch Input Status 239 R 0=Enable switch On
1=Disabled
MXI External Enable Input Status 240 R 0=Enable switch On
1=Disabled
Xi 1.0 Igniter Current Input Register 1043 R mA
Xi 1.0 External Vent Relay Input Status 163 R 0=Open
1=Closed
Xi 1.0 Blower Relay Input Status 165 R 0=Open
1=Closed
Gas Valve Relay Input Status 166 R 0=Open
1=Closed
Number of Cycles
4 Input Registers 1000 - 1001 R
Elapsed Time
4 Input Registers 1002 - 1003 R Hours x 100
Elapsed Days
5 Input Register 1004 R Days
Elapsed Hours
5 Input Register 1005 R Hours
Heating Time
4 Input Registers 1006 -1007 R Hours x 100
Heating Days
5 Input Register 1008 R Days
Heating Hours
5 Input Register 1009 R Hours
CCB Hardware Fault Counter Input Register 53 R
Xi 1.0 Model Fault Counter Input Register 54 R
Primary Temperature Fault Counter Input Register 55 R
Secondary Temperature Fault Counter Input Register 66 R
Communication Fault Counter Input Register 69 R
ECO Fault Counter Input Register 70 R
Low Gas Pressure Fault Counter Input Register 71 R
Blocked Inlet Fault Counter Input Register 72 R
Blocked Exhaust Fault Counter Input Register 73 R
Xi 1.0 External Vent Fault Counter Input Register 74 R
Blower Prove Fault Counter Input Register 75 R
Xi 1.0 Igniter Fault Counter Input Register 77 R
Ignition Failure Fault Counter Input Register 78 R
Power Supply Fault Counter Input Register 79 R
Powered Anode Fault Counter Input Register 83 R
1. Data is Version encoded into the upper 8 bits and Revision (Lower 8 bits).
2. This limits modulation to maximum EMS Percent Commanded. 100% = Allow up to rated firing (faster recovery). 0% =
minimum modulation rate more efficient but has a slower recovery rate i.e. derates heater capacity).
3. MXi only: Due to hardware design MXi cannot detect switch state when in fault condition and will read 0. In standby any
switch of lower in the limit string than an open switch above it will also appear open. Limit string order is Low Gas Pressure,
Blocked Exhaust, Blocked intake and Blower prove.
4. Data stored in two 16 bit registers “Big Endian” (Higher order bits in lower register number)
5. Hours and Days used together derived from Time (hours x 100). i.e. Elapsed Time of 13612.24 hours in “Days” and
“Hours” = 567 days, 4 hours.