Unit Protection Devices

    Warning
  • Equipment Damage and Risk of Injury
  • The unit may start at any time without warning when the unit On/Off switch in the On position. Units equipped with a SG controller feature a Delayed Restart mode. The controller will make up to three (3) attempts every 20 minutes to restart the unit after a Delay Alarm has occurred. The Delayed Restart mode continues until the unit has been successfully restarted, or until a Shutdown Alarm is generated. Protection shutdown devices that cause an Delayed Restart shutdown condition include low oil pressure, low oil level, and high coolant temperature.

  • Fuses: The electrical system is equipped with fuses for protection. See the Electrical Maintenance chapter for more information.

  • Coolant Level Switch: The coolant level switch closes if the coolant level drops below an acceptable level. If it stays closed for a specified time, the microprocessor records and alarm code.

  • Engine Coolant Temperature Sensor: The microprocessor gets the engine coolant temperature information from the Engine Control Unit (ECU). If the engine coolant temperature rises above an acceptable level, the microprocessor records and alarm code. The microprocessor might also shut the unit down.

  • Low Oil Level Switch: The low oil level switch closes if the oil drops below an acceptable level. If it stays closed for a specified time, the microprocessor shuts the unit down and records an alarm code.

  • Low Oil Pressure Switch: The low oil pressure switch closes if the oil pressure drops below an acceptable level. If it stays closed for a specified time, the microprocessor shuts the unit down and records an alarm code.

  • Preheat Buzzer: The preheat buzzer sounds when the controller energizes the preheat relay. This warns anyone near the unit that the controller is about to start the engine.

Parent topic: Unit Description