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1 General Control Scheme Flowchart
Sec ons 3-2 to 3-7 on the following pages detail when each of the controls in the flowchart below is ac vated.
Stop opera on
•
Abnormal shutdown
•
System stop
Standby control
•
Crankcase heater control
Startup control
•
Compressor startup delay control
•
Startup control for cooling opera on
•
Startup control for hea ng opera on
Normal opera on control
•
Component control during normal opera on
•
Compressor output control
•
Compressor step control
•
Electronic expansion valve control
Protec on control
•
High pressure protec on control
•
Low pressure protec on control
•
Discharge temperature protec on control
•
Compressor protec on control
•
Disable hea ng control
Thermo on
2
3
4
Special control
5
Condi ons met
for oil return
Condi ons met
for defros ng
6
•
Oil return opera on
•
Defros ng opera on
Legend
Numbers in the top right-hand
corners of boxes indicate the
relevant sec
n of text on the
following pages.
7
19
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