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Walk-In Refrigerators | Up
Utilitiesman Basic Volume 02 - Manual for electric, plumbing, water and other utilities | Next
Two-Door Refrigerator-Freezer Combination |
types—one for bulk storage of fresh meats, dairy
products, vegetables, and fruits requiring a
temperature from 35°F to 38°F and the other for the
storage of frozen food at temperatures of 10oF or
below. The 35°F to 38°F refrigerators are built and
shipped in sections and assembled at the location they
are installed. They can be taken apart, moved, and
reassembled in another area if needed. Standard-size
coolers can be from 24 square feet up to 120 square feet
in floor area. A walk-in refrigerator with reach-in
doors is shown in figure 6-37.
The exterior and interiors of these units are
normally galvanized steel or aluminum. Vinyl,
porcelain, and stainless steel are also used. Most
walk-in refrigerators use rigid polyurethane board,
batten, or foamed insulation between the inner and
outer walls. For storage temperatures between 35°F to
40°F, 3 to 4 inches of insulation is generally used. For
low-temperature applications, 5 inches or more of
insulation is used. These refrigerators are equipped
with meat racks and hooks to store meat carcasses.
Walk-in refrigerators also have a lighting system
inside the refrigerator compartment. Most systems
have the compressor and condenser outside the main
structure and use either a wall-mounted forced-air or
gravity-type evaporator that is separated from the main
part of the cabinet interior by a vertical baffle.
The operation of the walk-in refrigerator is similar
to that of the reach-in units. The evaporator must have
Figure 6-37.—A walk-in refrigerator with reach-in doors.
sufficient capacity (Btu per hour) to handle the heat
load from infiltration and product load.
DOMESTIC REFRIGERATORS
Domestic refrigerators are used in most facilities
on a Navy installation. Most domestic refrigerators are
of two types—either a single door fresh food
refrigerator or a two-door refrigerator-freezer
combination, with the freezer compartment on the top
portion of the cabinet, or a vertically split cabinet
(side-by-side), with the freezer compartment on the
left side of the cabinet. They are completely
self-contained units and are easy to install. Most
refrigerators use R-22 refrigerant, normally
maintaining temperatures of 0°F in the freezer
compartment and about 35°F to 45°F in the refrigerator
compartment. The Utilitiesman must be able to
perform various duties in the maintenance and repair
of domestic refrigerators, water coolers, and ice
machines at Navy activities. This section provides
information to aid you in handling some of the more
common types of troubles. But let us remind you that
the information given here is intended as a general
guide and should, therefore, be used with the
m a n u f a c t u r e r ' s d e t a i l e d i n s t r u c t i o n s . F o r
troubleshooting guidance, see table Y in appendix II at
the back of this TRAMAN.
Single Door Fresh Food Refrigerator
A single door fresh food refrigerator (fig. 6-38)
consists of an evaporator placed either across the top or
in one of the upper corners of the cabinet. The
Figure 6-38.—Single door fresh food refrigerator.
6-25
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