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 controller’s response to low temperature detection, condensate
overflow, and fan status diagnostics.
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