| 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 Utilities man 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
- Costs 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.
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