Thermo King CSR-20 Series User Manual

9-4 Schematic Circuit Tracings Electrical, Refrigeration and µP-D Menu Flow Diagrams
CSR-20 & CSR-40, September 1999
1
When external power is disconnected from unit, microprocessor operation requires an on-board 12 Vdc battery, or an
external 12 Vdc battery connected to the battery jack on Power Module Board inside control box. Then press
SELECT key or connect communications cable to Data Port on bottom of control box.
2
Typical model shown with three evaporator fans.
Microprocessor Awakened from Sleep Mode
1
(when external power is disconnected from unit)
2

Thermo King CSR-20 Series Specifications

General

Brand	Thermo King
Model	CSR-20 Series
Category	Heat Pump
Language	English