Promax RG5410A-EXTREME Manual De Funcionamiento Del Usuario página 21

Advanced Test Products RG5410A-EXTREME
KEEPING THE DIRT OUT
During the recovery process your recovery machine can be exposed to debris that can,
potentially, damage it. Including brazing spatter and copper and brass slithers. Further
contamination can be introduced from the refrigerant storage tanks. To
prolong the life of your recovery machine always use an in-line filter.
Whenever you are charging a system from a recovery cylinder it is a good idea to use
an in-line filter to protect the system from contamination. Again, change your
in-line filters often.
Getting the Liquid Out (See "Push/Pull-Method")
Push-pull is a method of removing bulk liquid from a system using the pressure
differential created by the recovery machine. Push-pull will generally not work on
smaller systems because there is no bulk liquid reservoir to create a siphon from.
Push-pull is mostly used on systems with a receiver tank or those with greater than 20
lbs. of refrigerant, or when transferring from one tank to another. The rate of liquid
transfer is very much dependent on hose size, with larger hoses providing much
better throughput.
Another trick is to chill the tank, if it's partially filled, prior or during recovery. This
operation will lower the pressure in the storage tank and therefore speed up recovery.
There must be a minimum of 5 lbs of liquid refrigerant in the tank you wish to chill. This
operation can be performed prior to or during the recovery. See the two set up diagrams
and procedures on page 8 of this manual.
There is nothing magic here, you are simply using your recovery machine to make a
refrigerator where the tank is the evaporator. By throttling the output valve, you're
effectively creating a capillary tube or an expansion device, but you need to adjust the
backpressure to suit the conditions and the refrigerant. Five to ten minutes of chilling
can produce some very dramatic tank cooling, depending on the conditions. If there are
any non-condensable in the tank this process will not work. Also the greater the quantity
of refrigerant in the tank the longer the process will take.
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