| 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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