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18
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
Mxi Mod% Cmd
Commands Modulation % (0%=minimum heat,
100%=rated heat). Note: It is really an upper limit.
If heater wants to command less it will.
Analog Value 207
Present_Value
R/W
%
0
100
MxiLowTempAlrmSP
2
(Low Temperature Alarm)
Analog Value 208
Present_Value
R/W
ºC
(ºF)
32.2
(90)
82.2
(180)
Number of Cycles
(Number of heating cycles)
Analog Value 209
Present_Value
R
Elapsed Time
(Time heater has been powered up in Hours with
two place beyond the decimal)
Analog Value 210
Present_Value
R
Hours with two
places beyond
the decimal.
Elapsed Days
(The number of days that the heater has been
powered up)
Analog Value 211
Present_Value
R
Days
Elapsed Hours
(The hours portion that the heater has been pow-
ered up. Use with Elapsed Days)
Analog Value 212
Present_Value
R
Hours
Heating Time
(Time heater has been actually heating water in
Hours with two place beyond the decimal)
Analog Value 213
Present_Value
R
Hours with two
places beyond
the decimal.
Heating Days
(The amount of time in number of days heater has
been actually heating water)
Analog Value 214
Present_Value
R
Days
Heating Hours
(The hours portion of the amount of time heater
has been actually heating water. Use with Heating
Days)
Analog Value 215
Present_Value
R
Hours
IgniterCurrent
(Hot Surface Igniter current in amps)
Analog Value 216
Present_Value
R
Amps
#CCB HW Faults
(CCB Hardware Fault Counter)
Analog Value 217
Present_Value
R
#Model Faults
(Model Fault Counter)
Analog Value 218
Present_Value
R
#Upper Temp Faults
(Upper Temperature Probe Fault Counter)
Analog Value 219
Present_Value
R
#Lower Temp Faults
(Lower Temperature Probe Fault Counter)
Analog Value 220
Present_Value
R
#Flame Probe Flt
(Flame Probe Fault Counter)
Analog Value 221
Present_Value
R
#Flame Status Flt
(Flame detect or not detected at proper time Fault
Counter)
Analog Value 222
Present_Value
R
#CCB Comm Faults
(Communication Fault Counter)
Analog Value 223
Present_Value
R
#ECO Faults
(High temperature Energy Cut Off switch in Upper
temperature probe Fault Counter)
Analog Value 224
Present_Value
R
#LowGasPress Flt
(Low Gas Pressure switch Fault Counter)
Analog Value 225
Present_Value
R
#Blocked In Flts
(Blocked Inlet pressure switch Fault Counter)
Analog Value 226
Present_Value
R
#Blocked Exhst Flt
(Blocked Exhaust Pressure & Condensate switch
Fault Counter)
Analog Value 227
Present_Value
R
#Ext Vent Faults
(External Vent Fault Counter)
Analog Value 228
Present_Value
R
#Blower Prv Flts
(Blower Prove Pressure Switch Fault Counter)
Analog Value 229
Present_Value
R
#Igniter Faults
(Igniter Fault Counter)
Analog Value 230
Present_Value
R
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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