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1948-49 Theatre Catalog, 7th Edition, Page 456 (443)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 456
Page 456

1948-49 Theatre Catalog, 7th Edition, Page 456



EMPTYING OF CYLINDERS is outlined in this illustration, showing the course of the refrigerant from the cylinder, to the compressor and condenser, crnd finally to the Freon storage tank.

may result in loss or waste of as much as 6 per cent of the total charge in a standard 145-pound cylinder.

Close observance of the following suggestions will enable you to obtain full weight from every cylinder.

(1) Place the Freon-12 cylinder with hood on Scale to obtain gross weight.

(2) Remove cylinder from scale and place it in a bucket or barrel of hot water not exceeding 1250 Fahrenheit.

(3) After cylinder is thoroughly heated to increase pressure, remove from hot bath and invert cylinder. Connect line to valve, open valve, and discharge all liquid Freon-12.

Caution: Never subject cylinder filled with compressed gas to a temperature above 1250 Fahrenheit. Never permit a direct name to touch the cylinder or fuse plug.

(4) Connect the cylinder to the suction line of the compressor and evacuate the cylinder to 28 to 29 inches of mercury for a period of 20 to 30 minutes. The Freon-12 vapor removed from the cylinder is compressed and condensed and discharged into a storage container or charging line.

(5) When the cylinder is completely evacuated, close the valve tightly, replace hood and again weigh the cylinder.

(6) Subtract tare Weight from gross

weight of cylinder. The difference rep resents the net weight of Freon-12 removed from the cylinder. Compare net weight with that shown in column 6 of anaylsis report accompanying each shipment of Freon-12. This should be 145, 25, 10, or 4, depending upon capacity of the cylinder. If weights differ, evacuation of cylinder is incomplete.

(7) If determination shows that evacuation is not complete, repeat operation No. 4.

Method of Charging

The correct way of charging a system using Freon-12 is neither difficult nor complicated. These suggestions will help you.

Before undertaking to charge a refrigerating system, it is recommended that all threaded connections and valve stem packings on the liquid line from cylinder to charging unit be thoroughly checked for possible leaks. A Halide leak detector torch should always be used for this Purpose. If leakage is evident, steps should be taken to eliminate the leak. Various types of connections, temperature, pressure, and. time factors necesSarin govern the extent to which losses due to leakage may occur. A previous section descrile in detail the proper methods of detecting leaks.

The cylinder of Freon-12 should first


be weighed, with hood, to determine the gross weight of the cylinder and contents.

The cylinder is next removed from the scale, hood removed and lines connected from the cylinder to the system. Valves are opened and the system charged with the required amount of Freon-12.

Caution: To cause the flow of Freon-12 into the system, the pressure within the cylinder must be greater than in the system, but not more than 168 pounds gauge.

When the system is charged, valves closed, and cylinder disconnected from the system, the cylinder is reweighed with the hood. Weight of the cylinder subtracted from its original gross weight determines the net weight of Freon-12 charged into the system.

In making or breaking the liquid line connections between the cylinder and the system, losses approximately 2.5 per cent of the net weight of a 145-pound cylinder may result. However, the practice of using short connections between valves of the cylinder and system will aid in keeping losses low.

HandHng CyHnders

The following suggesitions are offered to assist users of Freon-12 to obtain maximum efficiency from systems where this refrigerant is used.

(1) To prevent dirt from entering the valve after charging, replace the brass cap on the outlet connection as soon as the valve is closed and the cylinder has been disconnected. This will forestall damage to the threads of the valve.

Close valve immediately after the cylinder is emptied to avoid drawing liquid Freon-12, air, or oil into the cylinder. ,

Cylinder valve can be protected by tightly securing hoods after cylinders are empty and ready for return,

(2) Cylinders of Freon-12 should be stored upright. Keep them in a cool, dry place away from salt or other corrosive elements. Rust damages cylinders. It may cause the hood to stick and may injure the valve.

(3) The connections on Freone12 cylinders should fit easily and snugly. It



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FOR HANDLING CYLINDERS. [he four solienl cautions are indiculed in these sketches. Cons siderinq cylinders as a true put! of the system will add to their life and satisfactory operalion.

is unwise to force them. Threads on the fitting should be the same as those on the cylinder valve outlet. Stripped threads cause leaks, and valves cannot be repaired,

When the cylinder is connected to the system, the valve should be opened slowly. Only those tools or wrenches approved by compressed gas manufacs turers should be used. Hammering valve stems in opening or closing may cause damage to the valve or system connection and lead to unnecessary repairs and the loss of Freon-12.

(4) Freon-12 is supplied in cylinders with valves containing built-in safety devices. To insure proper function of these safeguards, users are cautioned against tampering with the valves and fuse plugs.

(5) Cylinders should be protected against cuts or abrasion. Cylinders should never be used for rollers or supports, since they are not designed for these purposes.

(6) It is recommended that Kinetic Chemicals, Inc., be consulted if any doubt exists regarding the proper handling of Freon-12 cylinders.

THE CORRECT WAY of charging a system using Freon-12 is neither difficult nor complicated. The two general methodsevupor and liquid chatqingwre indicated in the drawing, the x's indicating impor. tcmt places to which attention should be given. In charging, as well as in closing down the system, all possible spots where leaks might occur should be checked, with a Halide leak detector in case of doubt.

X N .---v n m #CVLINO , X






1948-49 Theatre Catalog, 7th Edition, Page 456