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Analog inputs
CNT-SVX07C-EN 17
SET: Local 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. The local setpoint input is configurable
(as enabled or disabled) using the Rover service tool. A setpoint value
communicated by means of a LonTalk link can also be used for controllers
operating on a BAS. If both hard-wired and communicated setpoint val-
ues 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). If a valid hard-wired or communicated setpoint 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 (hard-wired) fan mode
switch input for applications using the Trane zone sensor with a fan mode
switch option. The various fan mode switch positions (off, low, medium,
high, auto) provide different resistances that are interpreted by the
Tracer ZN521. The local fan mode switch input is configurable (as
enabled or disabled) using 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 hard-wired and communicated fan
mode values are present, the controller uses the communicated value. If
neither a hard-wired 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 hard-wired or communicated fan
mode value is established and then is no longer present, the controller
generates a Fan Mode Failure diagnostic.
AI1: Entering water temperature
The AI1 analog input functions as the local (hard-wired) entering water
temperature input. An entering water temperature communicated via the
LonTalk communications link can also be used for controllers operating
on a BAS. If both hard-wired and communicated entering water tempera-
ture values are present, the controller uses the communicated value. If a
valid hard-wired or communicated entering water temperature value is
established and then is no longer present, the controller generates an
Entering Water Temp Failure diagnostic.
For units configured as 2-pipe or 4-pipe changeover units, the entering
water temperature is used to make heating/cooling operation decisions. If
neither a hard-wired nor a communicated entering water temperature
value is present on changeover units, the controller will always operate in
heating mode.