SMART REEFER 3 (SR-3) Control System

The SR-3 is a microprocessor control system designed for a transport refrigeration system. The SR-3 integrates the following functions:

  • Changing setpoint and operating mode

  • Viewing gauge, sensor, and hourmeter readings

  • Initiating Defrost cycles

  • Viewing and clearing alarms

The microprocessor components are located inside the control box, which is located inside the lower roadside service door. The microprocessor is connected to a Human Machine Interface (HMI) Control Panel. It is used to operate the unit. The HMI control panel is mounted on the face of the control box. It is clearly visible through an opening in the lower roadside service door.

Refer to “Operating Instructions” for more information about the SR-3 Controller.

Depending on the air temperature in the trailer, as sensed by the microprocessor Base Controller, the unit will typically operate in one of the following modes.

Parent topic: Unit Description

CYCLE-SENTRY Operation

  • High Speed Cool

  • Low Speed Cool

  • Null (Engine Off)

  • Low Speed Heat

  • High Speed Heat

  • Defrost

Continuous Run Operation

In diesel operation the microprocessor will select the operating mode from the following:

  • High Speed Cool

  • Low Speed Cool

  • Low Speed Modulated Cool

  • Low Speed Modulated Heat

  • Low Speed Heat

  • High Speed Heat

  • Defrost