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BACnet / Gas Water Heaters
Table 10. BACnet/Gas Water Heaters Object List
BACnet
Object Name
(Description)
BACnet
Object
Type/Inst.
BACnet
Object
Property
R/W
Units
Min
Value
(if W)
Max
Value
(if W)
Xi 1.0
Mxi
#Ignition Failure
(Ignition Failure Fault Counter)
Analog Value 231
Present_Value
R
#Powr Supply Flt
(Power Supply Fault Counter)
Analog Value 232
Present_Value
R
#Powr Anode Flts
(Powered Anode Alert Counter)
Analog Value 233
Present_Value
R
EMS Mode-Status
Analog Value 263
Present_Value
R/W
Xi 1.0 see table 3
Upper Temp Open
(Upper temperature Probe open status)
Binary Input 301
Present_Value
R
0 = Okay
1 = Open
Upper Temp Short
(Upper temperature Probe shorted status)
Binary Input 302
Present_Value
R
0 = Okay
1 = Shorted
MXi Call For Heat
Binary Input 303
Present_Value
R
0 = No
1 = Yes
Lower Temp Open
(Upper temperature Probe open status)
Binary Input 304
Present_Value
R
0 = Okay
1 = Open
Lower Temp Short
(Upper temperature Probe shorted status)
Binary Input 305
Present_Value
R
0 = Okay
1 = Shorted
Igntr Current OK
(Igniter Current Sensed)
Binary Input 306
Present_Value
R
0=No Current
1=Current
Sensed
Flame Sensed
(Igniter Current Sensed)
Binary Input 307
Present_Value
R
0=No Flame
1=Flame Sensed
Blower Prove PS
(Blower Prove pressure switch)
Binary Input 308
Present_Value
R
0=Open Switch
1=Closed Switch
Ext Vent PS
(External Vent pressure switch status if selected by
DIP switch on CCB)
Binary Input 309
Present_Value
R
0=Open Switch
1=Closed Switch
Blocked Exhaust PS
(Blocked exhaust pressure switch)
Binary Input 310
Present_Value
R
0=Open Switch
1=Closed Switch
Blocked Inlet PS
(Blocked air intake pressure switch)
Binary Input 311
Present_Value
R
0=Open Switch
1=Closed Switch
Low Gas PS
(Low Gas supply pressure switch)
Binary Input 312
Present_Value
0=Open Switch
1=Closed Switch
Upper Temp ECO
(Upper temperature probe high temperature Ener-
gy Cut Out Status)
Binary Input 313
Present_Value
0=Open Switch
1=Closed Switch
External T’stat
(External Thermostat status if selected by DIP
switch on CCB)
Binary Input 314
Present_Value
0 = No
1 = Yes
Xi 1.0 Call For Heat
(Conditions are satisfied to allow heater to heat
water)
Binary Input 315
Present_Value
0 = Okay
1 = Alarm
MXi LowTemp Alrm
(Tank temperature below Low Tank Temperature
Alarm setpoint)
Binary Input 316
Present_Value
0 = Okay
1 = Alarm
MXi LeakDetected
(Optional Leak detector circuit detected water)
Binary Input 317
Present_Value
0=No Leak
1=Leak Detected
Mxi HeaterEnab’d
(Front Switch Heater Enable status)
Binary Input 318
Present_Value
0=Disabled
1 = Enabled
MXi External Enab
(Optional input status)
Binary Input 319
Present_Value
0=Disabled
1 = Enabled
Xi 1.0 Ign Tries
(Number of tries for ignition set by DIP switch on
CCB)
Binary Input 320
Present_Value
0 = 3 tries
1 = 1 try
Ext Vent Relay
(External Vent Relay output commanded status)
Binary Output 401
Present_Value
0 = Off
1 = On
1. Data is encoded into the 16 bits as major revision (upper 8 bits) and minor revision (lower 8 bits).
2. Not recommended for use currently as UIM does not currently support and warning will come up as “Unknown.”
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