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20
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
Blower Relay
(Blower Relay output commanded status)
Binary Output 402
Present_Value
0 = Off
1 = On
Ignition Relay
(Ignition Relay output commanded status)
Binary Output 403
Present_Value
0 = Off
1 = On
Gas Valve Relay
(Gas valve Relay output commanded status)
Binary Output 404
Present_Value
0 = Off
1 = On
MXi Ign Tries
(Selects 1 or 3 tries for ignition. Settable at UIM)
Binary Value 501
Present_Value
0 = 3 tries
1 = 1 try
MXi Use Ext Enab
(Selects whether or not to use Optional External
Enable Input. Settable at UIM)
Binary Value 502
Present_Value
0 = No
1 = Yes
MXi Modulation
(CCB S/W version 3.15 or higher. Disables mod
-
ulation on heaters that have it. May be helpful if
plumbed with Xi 1.0. Settable at UIM)
Binary Value 503
Present_Value
0=Disabled
1=Enabled
System In Fault
Binary Value 504
Present_Value
0 = Okay
1 = Alarm
System State
(CCB Control State)
Multistate Value 801
Present_Value
See Table 10
Fault Code
Multistate Value 802
Present_Value
See Table 13
Alert Code
Multistate Value 803
Present_Value
See Table 13
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.”
Central Control Board Major State Definitions
Table 11.
Gas Central Control Board (CCB) Major State Definitions
Value
Xi 1.0 State
MXi State
1
Off (Standby)
Off (Standby)
2
Pre-Purge
Pre-Purge
3
Igniter Warmup
Igniting
4
Ignition Activation
Gas Valve On
5
Ignition Verification
Inter-Purge
6
Inter-Purge
Heating
7
Heating
Post-Purge
8
Post-Purge
In Fault
9
Fault
Xi 1.0 Energy Management System (EMS) Control
Xi 1.0 uses a single bit setting method. Within the EMS Mode-Status point one bit command (bit 15) sets it in EMS mode, and other
ends EMS mode. Once in EMS mode, another bit command (bit 0) enables heating another disables heating.
Once in EMS mode the EMS Mode Refresh command must be periodically issued which clears a third bit (bit 14) to maintain EMS
mode, otherwise the heater will end EMS mode and resume normal operation.
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