Chapter 6 Applications for the 1 heat/1 cool configuration
36 CNT-SVX06B-EN
ZN: Zone temperature
The ZN analog input functions as the local (hardwired) zone temperature
input. The controller receives the temperature as a resistance signal from
a 10 kΩ thermistor in a standard Trane zone sensor wired to analog input
ZN. A communicated zone temperature value via the LonTalk communi-
cations link can also be used for controllers operating on a BAS. When
both a hardwired and communicated zone temperature value is present,
the controller uses the communicated value. If neither a hardwired nor a
communicated zone temperature value is present, the controller gener-
ates a Zone Temp Failure diagnostic.
The ZN analog input is also used to communicate timed override requests
and cancel requests to the controller for applications utilizing a Trane
zone sensor with the ON and CANCEL button option.
SET: Local set point
The SET analog input functions as the local (hardwired) temperature set-
point input for applications utilizing a Trane zone sensor with a tempera-
ture set-point thumbwheel. The ability to enable or disable the local set-
point input is available in the Rover service tool. A communicated set-
point value via the LonTalk communications link can also be used for con-
trollers operating on a BAS. If both a hardwired and a communicated set-
point value is present, the controller uses the communicated value. If nei-
ther a hardwired nor a communicated set-point value is present, the con-
troller uses the stored default set points (configurable in Rover). If a valid
hardwired or communicated set-point value is established and then is no
longer present, the controller generates a Setpoint Failure diagnostic.
FAN: Fan mode input
The FAN analog input functions as the local (hardwired) fan mode switch
input for applications utilizing the Trane zone sensor with a fan mode
switch option. Valid fan modes for a 1 heat/1 cool unit are off, low,
medium, high, and auto. The ability to enable or disable the local fan
mode input is available in the Rover service tool. A communicated fan
mode request via the LonTalk communications link can also be used for
controllers operating on a BAS. If both a hardwired and a communicated
fan mode value is present, the controller uses the communicated value. If
neither a hardwired nor a communicated fan mode value is present, the
controller recognizes the fan mode value as auto and operates according
to the default configuration. If a valid hardwired or communicated fan
mode value is established and then is no longer present, the controller
generates a Fan Mode Failure diagnostic.
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