Trane UniTrane Installation Operation & Maintenance page 73

Table 26. Binary Input Configurations
Binary
Input Description
BI 1 Low temperature
detection (Note 1)
BI 2 Condensate overflow (Note 1)
BI 3 Occupancy
BI 3 Generic binary input
BI 4 Fan status (Note 1)
Note 1: During low temperature, condensate overflow, and fan status diagnostics, the Tracer
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 controller's response to low temperature detection, condensate
overflow, and fan status diagnostics.
input as not used.
BIP Description
BI 1 Low temperature detection
BI 2 Condensate overflow
BI 4 Fan status
UNT-IOM-6
Configuration
Normally closed
Normally closed
Normally open
Normally open
Normally open
Fan Valve Electric heat
Off Open
Off Closed
Off Closed
®
Tracer ZN.520
Controller operation
Contact closed
Normal
Normal
Unoccupied
Normal (Note 3)
Normal Diagnostic
(Note 4)
Damper
Off
Off
Off Closed
Contact open
Diagnostic
(note 5)
Diagnostic
(note 5)
Occupied
Normal
(Note 3)
®
ZN.520
Closed
Closed
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