Engine Compartment Components

Coolant Expansion Tank: The coolant level and temperature are monitored by the base controller. If the coolant temperature becomes too high or the level becomes too low, an alarm will occur.

The engine must have antifreeze protection to –30 F (–34 C). Check and add coolant in the expansion tank as needed.

Note The use of 50/50% pre-mixed ELC is recommended to ensure that deionized water is being used. If 100% full strength concentrate is used, deionized or distilled water is recommended instead of tap water to ensure the integrity of the cooling system is maintained. The engine must have antifreeze protection to -40°F/ -40°C. Check and add coolant in the expansion tank as needed.

Note All T-90 units built on or after April 22, 2021 are equipped with a cooling system enhancement which includes a new expansion tank to help alleviate code 37 issues, see Service Bulletins SB834 and SB828.

    Caution
  • Hazardous Pressures
  • Do not remove expansion tank cap while coolant is hot.

Engine Oil Dipstick: Use the engine oil dipstick to check the engine oil level.

Receiver Tank Sight Glass: The receiver tank sight glass is used to assist in checking the amount of refrigerant in the system.

Compressor Oil Sight Glass: The compressor oil sight glass is used to check the relative level of compressor oil in the compressor sump.

Parent topic: Unit Description