Start-Up And Shut-Down; Sequence Of Operation; Software Operation Overview Diagram - Trane CVHE Installation, Operation And Maintenance Manual

Start-up and Shut-down

This section will provide basic information on chiller
operation for common events. With microelectronic
controls, ladder diagrams cannot show today's complex
logic, as the control functions are much more involved
than older pneumatic or solid state controls.

Sequence of Operation

Adaptive control algorithms can also complicate the exact
sequence of operation. This section illustrates common
control sequences.

Software Operation Overview Diagram

Figure 37 is a diagram of the five possible software states.
This diagram can be thought of as a state chart, with the
Figure 37. Software operation overview
Stopping
Preparing to Shut Down
Shutting Down
60
Stopped
Stopped
Run Inhibit
Fast Restart or Satisfied Setpoint
Stop Command or Diagnostic
Running
Running
Running - Limit
arrows, and arrow text, depicting the transitions between
states.
Descriptions
• The text in the circles are the internal software
designations for each state.
• The first line of text in the circles are the visible top
level operating modes that can be displayed on Tracer
AdaptiView.
• The shading of each software state circle corresponds
to the shading on the time lines that show the state that
the chiller is in.
Power
Up
Starting
Auto
Waiting to Start
Starting Compressor
CVHE-SVX02H-EN