Trane Tracer VV550 User Manual

62 CNT-SVX17G-EN
Sequence of Operations
Air Valve Control in Ventilation Flow Control Operation
The Tracer
®
VV550/VV551 controllers support one modulating air valve for heating and
cooling operation. Air delivered to the space is controlled with a three-wire floating-point
actuator that modulates the air valve. The controller positions the modulating air valve
to deliver the desired airflow (cooling or heating capacity). The desired airflow is called
the active flow setpoint.
The active flow setpoint is set to the communicated ventilation setpoint, if valid. If the
commun
icated ventilation setpoint is not valid, the configured ventilation setpoint is
used.
Unoccupied
cool
Unoccupied
heat
Unoccupied Cooling Off • Zero (air valve closed)
On • Configured minimum local heating airflow
• Configured minimum position setpoint
Heating Off • Zero (air valve closed)
On • Configured minimum local heating airflow
• Configured minimum position setpoint
MWU
Pre-cool
Night purge
Don’t care Cooling Off • Configured minimum airflow
• Configured minimum position setpoint
On • Configured minimum local heating airflow
• Configured minimum airflow
• Configured minimum position setpoint
Heating Off • Configured minimum heating airflow
• Configured minimum position setpoint
On • Configured minimum local heating airflow
• Configured minimum heating airflow
• Configured minimum position setpoint
a. PD is the acronym for pressure dependent.
b. PAT is the acronym for primary air temperature.
Table 40.Space temperature controller active minimum airflow setpoint selection (continued)
PD
a
STC mode
Effective
occupancy
mode
Control
action 
(PAT)
b
Local
reheat
state
Active minimum setpoint (the greatest of the
following)

Trane Tracer VV550 Specifications

General

Brand	Trane
Model	Tracer VV550
Category	Controller
Language	English