Space Temperature Analog Input - Trane Tracer VV550 Installation, Operation And Maintenance Manual

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
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
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
Space temperature Space
open on reset temperature
control
Ventilation flow
control
CNT-SVX17G-EN
Table 8 below).
Unit
operation
Construction
temporary
heat
Normal
operation
Flow control Normal
operation
Air valve Fan
operation operation
Occupied: Series fan
configured enabled;
maximum heating parallel fan
airflow Off
Unoccupied: closed
Normal Do not care
Normal Do not care
Inputs and Outputs
®
zone sensor. The
Reheat operation
Off
Normal
Do not care
13