Bacharach High Performance Oilless Commercial Refrigerant Recovery..., User Manual

Page: 9 / 24

9
Vapor/Liquid Recovery Operations
Perform the following steps when recovering refrigerant that is either in vapor or liquid form.
Note : Refer to “R-410A Recovery – Special Notes” on Page 14 when recovering R-410A.
1. Turn off all electrical or mechanical power to the refrigerant device to be evacuated.
2. Make proper hose connections. Connect refrigerant hoses to recovery cylinder,
STINGER, and A/C system as shown on Page 10. When possible, use a manifold-
gauge set to recover refrigerant from both the high- and low-side service ports. This
will speed up the recovery rates.
CAUTION: If the 80% tank full shutoff cord is not used, then use a scale to monitor the
refrigerant level in the recovery cylinder in order to prevent overfilling.
CAUTION: When recovering R-410A, you must use a recovery cylinder approved for
use with R-410A. Standard recovery cylinders with 350 psi working pressures are not
approved for use with R-410A.
3. Turn the inlet and outlet valves to their “OPEN” position, and the PURGE valve to its
“RECOVER” position. Open the vapor valve on the DOT recovery tank.
4. Use the rear mounted power switch to turn ON the STINGER. The compressor will now
begin to recover refrigerant.
Note : When recovering liquid, in rare instances a “knocking” sound may come from the
compressor. This indicates that too much liquid is entering the compressor. The inlet valve
must be regulated (closed) until this knocking sound stops, otherwise compressor damage
could occur. Pumping liquid when the compressor is knocking will damage the compressor,
reduce the compressor life, and void the compressor’s warranty . This condition is rare
and should not occur under normal recovery operations.
5. Proceed with the recovery process until the system pressure shows a vacuum. Turn
OFF the STINGER for a minimum of 5 minutes; after which, determine the amount of
refrigerant remaining in the system. Repeat this step until system pressure is below
mandatory EPA levels.
6. Purge the STINGER as follows:
a. Turn OFF the STINGER.
b. Turn the inlet and purge valves to their “PURGE” position (both pointing DOWN),
and the outlet valve to its “OPEN” position (pointing UP).
c. Turn ON the STINGER and monitor the inlet gauge. The purge operation is
complete when the inlet pressure gauge shows a vacuum.