General Control Scheme Flowchart - Trane TVR Pro CO Series Service Manual

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.
Stop operation
 Abnormal shutdown
 System stops
 A unit stops when the load demanded decreases
Startup control
 Compressor startup delay control
 Startup control for cooling operation
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
Protection control
 High pressure protection control
 Low pressure protection control
 Discharge temperature protection control
 Compressor and inverter module protection
control
Thermo on
2
3
Thermo on
4
Conditions met
for oil return
5
25
Special control
 Outdoor unit duty cycling
 Oil return operation
Legend
Numbers in the top right-hand
corners of boxes indicate the
relevant section of text on the
following pages.
6