MICRO-AIR Artic Air 24 Installationsanleitung PDF herunterladen (Seite 23)

Ideal Layout for Condensing Unit Below Plates

Ideal Tubing Layout

The illustrations above represent the ideal tubing layout. It shows all of the most important

considerations taken into account. In the first ideal layout, the suction tube exits at the top of the

box above the plates to get back to the condensing unit mounted above. To “lift” the oil up the

tube and transport it back to the condensing unit, a “P” trap is placed immediately at the bottom

of the upward run. All of the oil leaving the evaporators collects into this point. As the trap fills

with oil the velocity of the gas passing through it increases. The fast flowing gas lifts and carries

the oil back to the condensing unit.

In the second ideal layout, the P trap is not needed since there is a downward flow back to the

condensing unit. If you have a long horizontal run, it is good to use a P-trap at the exit of the

plate and U-traps every 8 feet.

Coming out of each plate, you have a small dip to prevent back flow of oil to the evaporator.

Where any two lines meet, the correct “tee” should be made. You can see that the “GOOD” and

“BEST” methods are used at all tees in these examples.

Another important advantage of the ideal layout is that the expansion valve sensing bulbs are

located well back from the common tubing. This ensures that they will sense only the

temperature of the gas coming from the evaporator they are feeding and not those of nearby

plates.

Also note that the check valves are installed such that the arrow points in the direction of the flow

forward, that is away from the plate and towards the condensing unit.

In the next illustration you will see examples of the kind of connections that you need to avoid.

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MICRO-AIR Artic Air 24 Installationsanleitung Seite 23