MICRO-AIR Artic Air 24 Przewodnik Instalacji Pobierz pdf (Strona 20)

Avoiding Oil Traps

Nothing will destroy your system faster than oil traps in the copper tubing. Oil traps are created

when improperly run suction (return) lines collect and trap the oil which naturally circulates

through the refrigeration system with the refrigerant gas. As the refrigerant flows through the

system it carries with it small oil droplets. These droplets of oil are heavier than the circulation

circulating gas and have a tendency to “fall out” and collect at low points in the tubing. In a

properly laid out tubing

runs, the oil accumulates in

a few small areas (such as

oil “P” traps) and is forced

back to the compressor by

the velocity of the flowing

gas. If the tubing is poorly

laid out, a large amount of

oil can collect in portions of

the tubing which do not

have high gas velocity

resulting in oil starvation of

the compressor and

premature failure. The

illustration here shows a

side view of how oil can

collect and flow in suction

line “tee” connections.

In BAD! and WORST!, the oil will collect in one or both evaporators. In such a large area, the

velocity of the gas is insufficient to lift the oil and carry it out the top of the connection. The result

is oil starvation of the compressor and oil-logging (saturation) of one of the evaporators.

In GOOD!, the oil can flow back to the condensing unit but runs the risk of also collecting in the

lower evaporator if only the top evaporator is in use.

In BEST!, all oil drains toward the condensing unit. Oil cannot back-flow into either evaporator.

Also, if you needed to go up to the condensing unit you would use this type of connection and

place a “P” trap at the bottom to collect and return the oil. You would put the riser after the P

trap.

To prevent oil traps, carefully plan your tubing runs using the following illustrations as a guide.

Note that the diagrams only show the suction (return) tubing. This the critical line. The

discharge line is more obvious and has been omitted for clarity.

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MICRO-AIR Artic Air 24 Przewodnik Instalacji Strona 20