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58 BCXC-SVX01B-EN
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temperature diagnostic when detecting low temperature. In addition, Tracer ZN controls unit
devices as listed below:
Fan: Off
Valves: Open
Electric heat: Off
Damper: Closed
Note: See the “Diagnostics” section for more information.
BIP2: Condensate Overflow Detection Option
The factory hard wires the condensate overflow sensor to binary input #2 (BIP2) on the Tracer™
ZN controller. The sensor defaults normally closed (N.C.), and will trip off the unit on a condensate
overflow diagnostic if condensate reaches the trip point. In addition, Tracer ZN controls unit devices
as listed below:
Fan: Off
Valves: Closed
Electric heat: Off
BIP3: Occupancy Sensor
Binary input #3 (BIP3) on Tracer™ ZN is available for field- wiring an occupancy sensor, such as a
binary switch or a timeclock, to detect occupancy. The sensor can be either normally open or
normally closed. Reference Table 27, p. 58.
BIP4: Fan Status (ZN520 Only)
Binary input #4 (BIP4) on Tracer™ ZN is available for sensor, such as a binary switch or a timeclock,
to detect occupancy. The sensor defaults normally open but can be configured as either normally
open or closed.
Table 27. Binary input configurations
Binary input Description Configuration
Controller operation
Contact closed Contact open
BI 1 Low temperature detection
(a)
(a)During low temperature, condensate overflow, and fan status diagnostics, the Tracer™ ZN520 control disables all normal
unit operation of the fan, valves, and damper.
NC Normal Diagnostic
(b)
(b)The table below shows the controller’s response to low temperature detection, condensate overflow, and fan status diag-
nostics.
BI 2 Condensate overflow
(a)
NC Normal Diagnostic
(b)
BI 3 Occupancy NO Unoccupied Occupied
BI 3 Generic binary input NO Normal
(c)
(c) The generic binary input does not affect unit operation. A building automation system reads this input as a generic binary
input.
Normal
(c)
BI 4 Fan status
(a)
NO Normal Diagnostic
Notes:
1. 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.
2. 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.
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