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Learning Objectives: When you complete this assignment you will understand the importance and use of maintaining, operating, and inspecting logs for refrigeration equipment

When maintaining, standing watch, operating, or inspecting refrigerating and air-conditioning equipment, you may be responsible for keeping operation, inspection, or maintenance logs on the equipment. Try to keep the logs neat and clean and ensure that any information recorded in them is accurate and legible.

Operation and maintenance logs may help to spot trouble in the equipment. They also aid in ensuring proper periodic maintenance and inspection are performed on the equipment. Logs may provide a means of self-protection when trouble occurs and the cause can be placed on an individual.

Good judgment must always be used in analysis of service troubles and specific corrections should be followed whenever possible. One of the methods for determining when and what corrective measures are necessary on equipment or a plant which is not operating properly is to compare the pressures and temperatures of various parts of the system with corresponding readings taken in the past when the equipment or plant was operating properly under similar heat load and circulating water temperature conditions.

A typical operating log may contain entries such as the following:

  • Date and time of readings
  • Ambient temperature
  • Suction pressure and temperature readings
  • Discharge pressure and temperature readings
  • Condenser pressure and temperature
  • Evaporator pressure and temperature
  • Oil level in the compressor
  • Operating hours

These types of readings give a complete picture of the current and past operating conditions of the equipment or plant and can assist the technician in keeping the equipment or plant at its maximum efficiency.

Maintenance logs contain entries of when, what, and who performed routine periodic maintenance on the equipment or plant. Such logs help ensure that the equipment or plant is well maintained and that the life expectancy of the equipment or plant is fully used.

These logs also can assist in determining estimates for future budget requirements for maintenance on the equipment or plant. Maintenance log entries may include the following:

  • Date of maintenance
  • Type of maintenance
  • What was done
  • Who did the work
  • Cost of the work
  • Materials used

It is important to compare operating log readings of the equipment or plant before the maintenance with those taken after the maintenance was completed to ensure maintenance was accomplished properly, and that it had no ill effects on the equipment or plant.

David L. Heiserman, Editor

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Revised: June 06, 2015