Liquid Push-Pull Recovery Operations - Stinger Refrigerant Recovery Unit User Manual

Liquid Push-Pull Recovery Operations

ATTENTION: Before attempting liquid push-pull recovery operations,
please review this page.
A scale or liquid-sight glass can be used to determine when all the liquid is
recovered. The STINGER will not pull a vacuum using the liquid push-pull
recovery operation. To finish the recovery operation, you must perform vapor
recovery operations as described on page 13.
GUIDELINES
If any of the following conditions are present in the system being evacuated, the
liquid push-pull operations may not be practical and vapor recovery operations
should be performed.
9
The equipment contains less than 20 lbs of refrigerant.
9
The equipment is a heat pump or other system with
refrigerant flow that would prevent you from isolating the
liquid.
9
Equipment has an accumulator between the service ports
used in the liquid recovery process.
9
Liquid refrigerant migration has occurred and the location of
the liquid is unknown.
9
The refrigerant tubing design on the equipment does not
allow for a solid column of liquid refrigerant to be formed.
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