Trane BCHC, BCVC, BCXC-SVX01B-EN BIP2 Condensate Overflow Detection Option, BIP3 Occupancy Sensor

Start-Up

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

			Controller operation
Binary input	Description	Configuration	Contact closed	Contact open
BI 1	Low temperature detection(a)	NC	Normal	Diagnostic(b)
BI 2	Condensate overflow(a)	NC	Normal	Diagnostic(b)
BI 3	Occupancy	NO	Unoccupied	Occupied
BI 3	Generic binary input	NO	Normal(c)	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.

(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.

(b)The table below shows the controller’s response to low temperature detection, condensate overflow, and fan status diag- nostics.

(c)The generic binary input does not affect unit operation. A building automation system reads this input as a generic binary input.

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

58 BCXC-SVX01B-EN