Section 400 - Maintenance And Service; Preventive Maintenance Procedures; Air Cooled Condensers; Compressor Oil Level - Thermo Scientific Harris MBF-700 Installation And Operation Manual

SECTION 400 –
MAINTENANCE
AND SERVICE
PREVENTIVE
MAINTENANCE
PROCEDURES

AIR COOLED CONDENSERS

COMPRESSOR OIL LEVEL

FAN MOTORS

DEFROSTING

Thermo Fisher Scientific
Because heavy traffic areas are dustier than others, a cleaning schedule for
air-cooled condensers and filters is difficult to predict. A suggested schedule,
however, is 6 months, which can be adjusted as needed. Access to the filters
is gained by removing the three screws at the outboard edge of both front
hinged panels and swinging them open. The filter will come out and can be
washed with a mild detergent, rinsed and replaced. It is not necessary to dry
the filter. The condenser coil itself may be vacuumed clean at the same time.
Lubricating oil is retained in the compressor sump. An oil pump at the
bottom of the crankshaft picks up the oil and feeds it to the crankshaft.
Centrifugal force then delivers oil under pressure to the bearings, crank pins,
etc. THE UNIT MUST BE LEVEL. If the compressor is not vertical oil
cannot reach the oil pump; this will result in bearing damage.
One or more cooling fans are provided in the machine compartment of
freezers, whether water- cooled or air-cooled. No oiling is necessary. During
periodic maintenance, these fans should be checked for operation. If the
compressors are running but any one of the fan motors is not, the
inoperative one must be replaced.
Chest type freezers do not require defrosting more often than once every six
months to a year unless they are subject to heavy usage. Frost will begin to
build at first around the top of the inner liner and will decrease in
proportion to the distance from the top. Frost or "snow" will be the most
apparent accumulation and it may be removed with a plastic scraper. If any
hard ice has developed, do not chip it using metallic objects. Instead,
remove all products stored in the freezer, turn the key "off ", unplug the unit,
and allow it to warm up. When temperature has risen far enough, the ice
can be readily dislodged.
SECTION 400 – MAINTENANCE AND SERVICE
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