54
RTHD-SVX01L-EN
7. Close all disconnect switches.
8. Refer to the sequence for daily unit startup for the
remainder of the seasonal startup.
Sequence of Operation
This section will provide basic information on chiller
operation for common events.
Adaptive control algorithms can enhance the sequence of
operations. This section illustrates common control
sequences.
Software Operation Overview
The Software Operation Overview shown in Figure 24, p.
54is a diagram of the five possible software states. This
diagram can be though of as a state chart, with the arrows
and arrow text depicting the transitions between states.
• The text in the circles is the visible top level operating
mode displayed on Tracer™ AdaptiView.
• The shading of each software state circle corresponds
to the shading on the time lines that show the state the
chiller is in.
There are five generic states that the software can be in:
• Power Up
• Stopped
• Starting
• Running
• Stopping
Figure 24. Software operation overview
Confirmed
Shutdown
Stopped
Stopped
Run Inhibit
Stopping
Preparing to Shut Down
Shutting Down
Running
Running
Running—Limit
Starting
Auto
Waiting to Start
Starting Compressor
Power
Up
Start
Command
Diagnostic
Res
e
t
Fast Restart or Satisfied Setpoint
Stop Command or Diagnostic
Stop Command
Diagnosti
c
Start
Confirmed
Timelines
• The time line indicates the upper level operating mode,
as it would be viewed on the Tracer AdaptiView™.
• The shading color of the cylinder indicates the software
state.
• Text in parentheses indicates sub-mode text as viewed
on Tracer AdaptiView.
• Text above the time line cylinder is used to illustrate
inputs to the Main Processor. This may include user
input to the Tracer AdaptiView Touch screen, control
inputs from sensors, or control inputs from a Generic
BAS.
• Boxes indicate control actions such as turning on
relays, or pulsing compressor load or unload solenoids.
• Smaller cylinders under the main cylinder indicate
diagnostic checks.
• Text outside a box or cylinder indicates time based
functions.
Start-Up and Shutdown
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