CNT-SVX17G-EN 13
Inputs and Outputs
Space Temperature Analog Input
The space (zone) temperature analog input can only be used for space temperature.
Space temperature is measured with a 10k thermistor in the Trane
®
zone sensor. The
controller receives the space temperature either from a local analog input, as measured
by the zone sensor, or as a remote communicated value. If both are present, the controller
uses the communicated value. The controller uses the network variable output space
temperature to report the space temperature value that it is using.
Construction Mode
On reset, if the space temperature input is not present (open circuit) and no valid
communicated space temperature is available, the controller provides temporary heat
for construction if configured as a space temperature controller. In construction mode
the controller provides heat by driving the air valve to the configured maximum heating
airflow (see Table 8 below).
Space Temperature Failure Diagnostic
If a valid space temperature is present, either locally or communicated, and then
disappears, the controller generates a space temperature failure diagnostic. If both the
local analog input and the communicated value are present, both have to disappear
before the controller generates a space temperature failure diagnostic.
Table 8. Controller operation with no space temperature analog input
Failure type Control type Unit
operation
Air valve
operation
Fan
operation
Reheat operation
Space temperature
open on r
eset
Space
temperature
control
Construction
te
mporary
heat
Occupied:
con
figured
maximum heating
airflow
Unoccupied: closed
Series fan
en
abled;
parallel fan
Off
Off
Ventilation flow
con
trol
Normal
operation
Normal Do not care Normal
Flow control Normal
oper
ation
Normal Do not care Do not care
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