10
LIQUID PUSH-PULL
R
ECOVERY GENERAL
I
NFORMATION.
Attention: Before attempting the following liquid push-pull recovery
operations, please review this page.
It may not be possible to recover liquid refrigerant from some types of refrigeration
equipment.
A scale or liquid sight glass can be used to determine when all the liquid is recovered. The
Fluoromizer will not pull a vacuum using the push-pull liquid recovery operation. To finish
the recovery operation, you must proceed to vapor recovery operations.
Guidelines
If any of these conditions are present in the system being evacuated, liquid push-pull
operations may not be practical and vapor recovery operations should be performed.
• The equipment contains less than 15 lbs. of refrigerant.
• The equipment is a heat pump or other system with refrigerant flow that would
prevent you from isolating the liquid.
• Equipment has an accumulator between the service ports used in the liquid
recovery process.
• Liquid refrigerant migration has occurred and the location of the liquid is unknown.
• The refrigerant tubing design on the equipment does not allow for a solid column of
liquid refrigerant to be formed.
Direct Liquid Recovery Operations
All compressors are designed to compress gases. Normally compressors are not capable
of pumping non-compressible fluids such as liquid refrigerant, however, the 3600-R410A
has been designed with a special head and valves that enable it to handle liquid directly.
This feature makes the 3600-R410A easier to use by minimizing the need to monitor
incoming refrigerant vapors and reduces compressor failures due to liquid slugging.
It is important to remember that the 3600-R410A is a compressor and not a liquid pump.
When large amounts of liquid are present, the liquid push-pull method of recovery should
be used. Using the 3600-R410A to pump large amounts of liquid refrigerant over a long
period of time will reduce the compressor life.
WARNING: A “Knocking” sound coming from the compressor indicates too much liquid is
entering the compressor. The inlet ball valve must be regulated as shown in the shaded
region until this knocking sound stops, otherwise compressor damage could occur.
Pumping liquid when the compressor is knocking will damage the compressor and will
reduce the compressor life. This will void the compressor warranty
.
A sudden slug of liquid into the compressor may cause a sudden spike in pressure and
cause the high-pressure safety shutoff switch to shut the compressor off. If this happens,
you must clear the liquid from the compressor before you can restart the compressor. To
prevent this from happening, always open the inlet valve slowly when starting a recovery
job. Opening the inlet valve quickly could allow a slug of liquid to enter the cylinder and
cause the high-pressure switch to shut the system down.
(40 pages)
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