Morning Warm-Up; Pre-Cool (Morning Cool Down); Night Purge; Construction (Temporary Heat) - Trane Tracer VV550 Installation, Operation And Maintenance Manual

Sequence of Operations

Morning Warm-up

Morning warm-up in ventilation flow control acts like auto.

Pre-cool (Morning Cool Down)

Pre-cool in ventilation flow control acts like auto.
Maximum Flow Heat
Maximum flow heat in ventilation flow control acts like auto.

Night Purge

Night purge in ventilation flow control acts like auto.

Construction (Temporary Heat)

Construction applies only to the space temperature control mode.

Humidity Control Functions

The controller is not capable of monitoring relative humidity either locally or over the
communication network.

Fan Control

Flow tracking control does not use the fan.

Stand-alone Control

The controller uses both communicated and hardwired inputs to derive information
required to control the space. Since communicated values can arrive independently, the
controller uses whatever data is available to make decisions on control actions.
With two exceptions, communicated values take precedence over hardwired inputs. It is
when:
•
•
As heartbeat communication variables are no longer valid, the controller relies more on
the hardwired inputs. Communication variables that are not heartbeat are always valid
until written not valid or power is cycled on the controller.
Modes and operations affected by communicated inputs include:
•
•
•
•
72
Local flow overrides to minimum flow (single star);
Maximum flow (double star) has precedence over the communicated flow override.
Occupancy;
Heat/cool;
Space temperature and setpoint selection;
Ventilation overrides (accurate ventilation requires communications).
CNT-SVX17G-EN