UNT-IOM-6
73
Tracer
®
ZN.520
input as not used.
BIP Description
Fan Valve Electric heat Damper
BI 1
Low temperature detection
Off
Open
Off
Closed
BI 2
Condensate overflow
Off
Closed
Off
Closed
BI 4 Fan status
Off Closed Off Closed
Table 26. Binary Input Configurations
Binary
Controller operation
Input Description
Configuration
Contact closed
Contact open
BI 1
Low temperature
Normally closed
Normal
Diagnostic
detection (Note 1)
(note 5)
BI 2
Condensate overflow (Note 1)
Normally closed
Normal
Diagnostic
(note 5)
BI 3
Occupancy
Normally open
Unoccupied
Occupied
BI 3
Generic binary input
Normally open
Normal (Note 3)
Normal
(Note 3)
BI 4 Fan status (Note 1) Normally open Normal Diagnostic
(Note 4)
Note 1:
During low temperature, condensate overflow, and fan status diagnostics, the Tracer
®
ZN.520
control disables all normal unit operation of the fan, valves, and damper.
Note 2:
The occupancy binary input is for standalone unit controllers as an occupied/unoccupied input.
However, when the controller receives a communicated occupied/unoccupied request, the communicated
request has priority over the hardwired input.
Note 3:
The generic binary input does not affect unit operation. A building automation system reads this
input as a generic binary input
Note 4:
If the fan mode input is in the off position or the controller is in the unoccupied mode with the fan
off, the fan status input will be open. A diagnostic will not be generated when the controller commands the
fan off. A diagnostic will only be generated if the fan status input does not close after one minute from
energizing a fan output or any time the input is open for one minute. The controller waits up to one minute
after energizing a fan output to allow the differential pressure to build up across the fan.
Note 5:
The table below shows the controllers response to low temperature detection, condensate
overflow, and fan status diagnostics.
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