Normal Operation - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Table 23.Airflow override controller operation (continued)
Communicated flow override
4 = Open
Fully open all air valves
5 = Close
Fully close all air valves
6 = Minimum
7 = Maximum
Other enumeration
Note: Local electric reheat is turned Off when the primary airflow rate falls below the configured minimum local heating airflow
minus 3% of the configured nominal airflow.
There is no impact on the reheat operation during airflow override. Parallel fans are
turned Off during the drive to configured maximum airflow or open to prevent physical
damage to the back-draft door.
Receiving the communicated flow override OFF request releases the air valve back to the
controller for normal operation. The controller automatically exits the airflow override
mode, changes communicated flow override to OFF, and reverts back to normal
operation if the configured manual override time (default = 600 minutes [10 hours])
elapses since the last valid reception of communicated flow override.
Fan Override
The fan can be remotely controlled by the use of the communicated fan speed command.
This variable can be used to request modulating speeds from 0% to 100% in 0.5%
increments.
Table 24.Fan override controller operation
Communicated
fan speed
command
No heartbeat
Off
On, 100%
On 0.5% to 99.5%

Normal Operation

Normal operation is the lowest priority sequence. The controller is functioning normally
when it is operating in one of the three control modes (space temperature control,
ventilation control, or flow tracking control) and in one of four occupancy modes
(occupied mode, unoccupied mode, occupied standby mode, or occupied bypass mode).
CNT-SVX17G-EN
Local or Air valve
remote
reheat
Normal Open
Normal Close
Normal Control airflow to the configured minimum
airflow
Normal Control airflow to the configured maximum
airflow
Normal Normal
Table 24 shows the affect of the variable on controller operation.
On/Off fans
series or
parallel
Off
On
On
Sequence of Operations
Air valve Reheat
Normal Local electric: Off;
Other: normal
Normal Normal
Normal Normal
Fan
Series normal
Parallel Off
Normal
Normal
Series normal
Parallel Off
Normal
33