Never attempt to alter or repair cylinders or valves.

Cylinders stored in the open must be protected from extremes of weather and direct sunlight. A cylinder should never be exposed to temperature above 120F.

Store full and empty cylinders apart to avoid confusion.

Never store cylinders near elevators or gangways.

Never store cylinders near highly flammable substances.

Never expose cylinders to continuous dampness, salt water, or spray.

Q17. Goggles are not required when working with refrigerants. True/False

Q18. How often should you weigh a refrigerant cylinder?

Q19. Why are full and empty refrigerant cylinders stored separately?

REFRIGERATION EQUIPMENT

Learning Objective: Understand and recognize the basic types of commercial and domestic refrigeration equipment.

Refrigeration equipment can be classified as either self-contained or remote units. Self-contained 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 installation.

REACH-IN REFRIGERATORS

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.