Trane TVR Pro CO Series - 1 General Control Scheme Flowchart

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1 General Control Scheme Flowchart
Sections 3-2 to 3-6 on the following pages detail when each of the controls in the flowchart below is activated.
Legend
Numbers in the top right-hand
corners of boxes indicate the
relevant section of text on the
following pages.
Conditions met
for oil return
Thermo on
Special control

Outdoor unit duty cycling

Oil return operation
6
Stop operation
 Abnormal shutdown
 System stops
 A unit stops when the load demanded decreases
2
Startup control
 Compressor startup delay control
 Startup control for cooling operation
3
Thermo on
Normal operation control
 Component control during normal operation
 Compressor output control
 Compressor step control
 Operation priority and rotation of compressors
 Electronic expansion valve control
 Outdoor fan control
4
Protection control
 High pressure protection control
 Low pressure protection control
 Discharge temperature protection control
 Compressor and inver
ter module protection
control
5