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 placing containers of hot water on the shelves, and
(4) Place air shutter control (2) in closed
using a plastic scraper to remove heavily caked frost.
position (pushed against front plate (6)).
(4) When frost is dissipated, wipe inside of
(5) Move motor switch to ON. Allow motor to
cabinet with a solution of baking soda in cold water to
run for a few minutes, then adjust oil metering valve (7)
remove food odors, then move switch toward COLDER
and air shutter control (2) to a desired flame without
until desired temperature is attained.
smoking.
2-27. Deep Freeze Unit Operation
NOTE
a. General. The deep freeze unit, located in the
Too much air or oil may extinguish
lazarette, has an 18 cubic foot capacity. It is a cabinet
the fire. When this occurs, turn off
type with a top opening door, and designed to maintain
oil metering valve and blower motor,
an average compartment temperature of -5 to -2oF
F
and allow fire to burn out. After fire
without food load, when the ambient temperature is
is dead, relight by following
120 . The compressor uses Freon 12 as a refrigerant,
F
procedure shown in steps (1)
and is complete with a fan cooled condenser. The
through (5) above.
controls include an automatic cycling device to maintain
a near constant (-3o) temperature, a warning signal to
c. Securing. Close oil metering valve (7), shutoff
indicate undue temperature rise, a temperature selector,
valve (8), and allow blower motor to run about 15 or 20
and a thermal overload cut-out with automatic reset for
minutes with air shutter control (2) fully open. This will
the motor. The compressor, alarm signal, motor, and
allow oil and carbon to be fully consumed.
controller are installed on a bracket foundation in the
engine room and secured to the after port side
NOTE
bulkhead.
If excess carbon accumulates on the
b. Operation.
receptacle. loosen with a scraper to
(1) Connect the electric power cable to the tugs
expedite its consumption.
electrical system.
(2) Move controller to ON.
2-26. Refrigerator Operation
(3) Move selector switch past NORMAL toward
a. General. The refrigerator, located in the galley,
COLDER until chest compartment reaches the desired
is used to store perishable food. It is equipped with a
temperature, then place switch at NORMAL. It will
temperature and defrost control switch. The compressor
maintain this temperature to within 3 .
F
and motor are located in a compartment at bottom of
the refrigerator cabinet.
2-28. Water Dispenser (Cooler) Operation
b. Operation.
a. General. This is a vertical type dispenser, and is
(1) Move switch on power control panel to ON.
located in the crews messhall.
The unit has a
(2) Move temperature regulating switch in
hermetically sealed compressor unit, and a fan cooled
cabinet to the desired temperature for refrigeration, (this
condensor that uses freon 12 refrigerant. The cooling
is generally accepted to be near 40 degrees F.) then
coils and storage tank are located in the upper portion of
close door.
the cabinet.
It has a thermostat control, with a
temperature adjusting screw, a relay, and an overload
NOTE
protector. It is heavily insulated with cork.
When an inspection of the interior
b. Operation.
shows an excessive accumulation of
(1) Assure that dispenser is connected to the
frost, proceed to step (3) below.
fresh water supply, and that drain is also attached.
(2) See that electric cable (12, fig. 2-32) is
(3) To defrost interior, move switch inside
connected to tugs electrical system.
cabinet to DEFROST. This cuts power for a warming of
the interior. The defrost process can be expedited by
2-61
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