Amana RCC Instruction Manual download pdf (Page 4)

Refrigeration Piping

REFRIGERANT VAPOR AND LIQUID LINE SIZING

See unit “Specification Sheet” for the required vapor and

liquid line tubing sizes. The listed sizes in the specification

sheet are suitable for line lengths of fifty feet or less and

indoor coil elevations of no more than forty feet above or

below the outdoor unit. NOTE: Unit performance is

affected by vapor line tubing size. A larger than required

vapor line tubing inhibits oil return to the unit. A smaller than

required vapor line tubing size decreases unit performance

by up to 10%. If a run of more than fifty feet is required,

contact your Amana distributor for assistance.

Check the indoor coil liquid and vapor line diameter. A

bushing or coupling may be needed to match with the line

sizes used. If mix-matching to a restrictor orifice indoor coil,

check the “Specification Sheet” for the proper orifice size to

be used with this outdoor unit. Piston orifices are supplied

with the outdoor unit.

REFRIGERANT VAPOR AND LIQUID LINE ROUTING

All of the vapor line must be insulated. The insulation must

include a vapor barrier.

The unit liquid line must be outside the vapor line insulation.

If any part of the liquid line runs through an area that will be

hotter than 120°F, that part must be insulated.

Avoid burying refrigerant lines. If you must bury them, first

dig the trench so that it gradually slopes toward the com-

pressor (at least 1 inch per 10 feet). Then, insulate the

liquid and suction lines separately. Enclose all under-

ground portions of the refrigerant lines in waterproof mate-

rial (conduit or pipe). If the lines must pass under or through

a concrete slab, be sure they are adequately protected.

• Seal the holes where the refrigerant piping enters

the building and support piping as necessary.

• Be careful not to kink or dent the refrigerant lines.

Kinked or dented lines will cause poor performance

or compressor damage.

FILTER DRIER INSTALLATION

CAUTION

To prevent damage to the unit, a bi-flow

filter drier must be installed in the liquid

line.

Install the supplied bi-flow line filter drier near the condens-

ing unit or near the indoor coil. A new filter drier (properly

sized and rated for R-22) MUST be installed with new

outdoor units in order for the compressor warranty to

remain valid. Any time the refrigeration system has been

opened for service, a new properly-sized bi-flow filter drier

rated for R-22 must be installed.

SWEAT CONNECTIONS AT THE UNIT

NOTE: When brazing, use a brazing alloy of 2% minimum

silver content. Do not use flux.

Before brazing connections, ensure the refrigerant line

ends are cut square, deburred, cleaned, free of nicks or

dents and round. Any other condition would increase the

chance of refrigerant leakage.

During brazing, wrap the component with a wet rag, or use

a thermal heat trap compound as directed by the compound

manufacturer, to avoid overheating the service valve, TXV

valve, or filter drier while brazing.

After brazing, quench the joints with water or a wet cloth to

prevent overheating of components. Inspect the paint

finish of the filter drier. If the paint of the steel filter drier has

been burned or chipped, repaint or treat with a rust preven-

tative. This is especially important on suction line filter

driers which are continually wet during the unit operation.

Safe Refrigerant Handling

WARNING

To avoid possible explosion, death, or

injury, practice safe handling of

refrigerants.

NOTE: While these items will not cover every conceivable

situation, they should serve as a useful guide.

WARNING

Refrigerants are heavier than air. They can

“push out” the oxygen in your lungs or in

any enclosed space. To avoid possible

death or difficulty in breathing:

• Never sniff a refrigerant.

• Never purge refrigerant into an enclosed

room or space. In fact, all refrigerants

must, BY LAW, be reclaimed.

• If an indoor leak is suspected, thoroughly

ventilate the area before beginning work.

• Liquid refrigerant can be very cold. To

avoid possible frostbite or blindness,

avoid contact and wear gloves and

goggles. If liquid refrigerant does contact

your skin or eyes, get medical help

immediately.

• Always follow EPA regulations. Never

burn refrigerant, as poisonous gas will

be produced.

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Amana RCC Instruction Manual Page 4

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