Chapter 3 Applications for the 2-heat/2-cool configuration
18 CNT-SVX12C-EN
ZN: Zone temperature
The ZN analog input functions as the local (hard-wired) 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 hard-wired and communicated zone temperature value is present,
the controller uses the communicated value. If neither a hard-wired nor a
communicated zone temperature value is present, the controller gener-
ates a Space Temperature 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: Temperature setpoint
The SET analog input functions as the local (hard-wired) temperature
setpoint input for applications utilizing a Trane zone sensor with a tem-
perature setpoint thumbwheel. Use the Rover service tool or a BAS to
enable or disable the local setpoint input. A communicated setpoint value
via the LonTalk communications link can also be used for controllers
operating on a BAS. If both a hard-wired and a communicated setpoint
value are present, the controller uses the communicated value. If neither
a hard-wired nor a communicated setpoint value is present, the controller
uses the stored default setpoints (configurable using the Rover service
tool or a BAS). If a valid hard-wired or communicated setpoint value is
established and then is no longer present, the controller generates a Local
Space Setpoint Failure diagnostic.
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