Never attempt to alter or repair cylinders or
Cylinders stored in the open must be protected
from extremes of weather and direct sunlight. A
cylinder should never be exposed to temperature
Store full and empty cylinders apart to avoid
Never store cylinders near elevators or
Never store cylinders near highly flammable
Never expose cylinders to continuous dampness,
salt water, or spray.
Q17. Goggles are not required when working with
Q18. How often should you weigh a refrigerant
Q19. Why are full and empty refrigerant cylinders
Learning Objective: Understand and recognize the
basic types of commercial and domestic refrigeration
Refrigeration equipment can be classified as either
self-contained or remote units.
equipment houses both the insulated storage
compartments (refrigerated), in which the evaporator
is located, and an uninsulated compartment
(nonrefrigerated), in which the condensing unit is
located, in the same cabinet. This type of equipment
can be designed with a hermetically sealed,
semisealed, or an open condensing unit. These units
are completely assembled and charged at the factory
and come ready for use with little or no installation
work. Self-contained refrigerating equipment includes
such equipment as domestic refrigerators and freezers,
water coolers, reach-in and walk-in refrigerators,
small cold-storage plants, and ice plants.
Remote refrigerating equipment has the
condensing unit installed in a remote location from the
main unit. These types of units are used where the heat
liberated from the condenser cannot enter the space
where the unit is installed or space is limited for
Reach-in refrigerators have a storage capacity of
15 cubic feet or greater. At Navy installations, they are
used to store perishable foods in galleys and messes.
Also, at Navy hospitals and medical clinics they are
used to store biologicals, serums, and other medical
Figure 6-34.A reach-in refrigerator with a remote condensing unit.