Model 3600
Refrigerant Recovery System
9
CHAPTER 4: RECOVERY
4.1. Helpful Hints for Recovering R-410A
R-410A has been designated by the EPA as a “very-high-pressure” refrigerant. Because of its higher
vapor pressure, recovering R-410A has some unique challenges. The higher vapor pressure requires
more work from the compressor, resulting in higher temperatures and increased wear on moving
compressor parts.
In order to reduce the affects of these conditions, Bacharach recommends the following:
•
Whenever possible, cool your recovery tank with ice or water. This keeps the compressor
discharge pressures lower, which will result in faster recovery rates and longer compressor
life.
•
Avoid recovering large amounts of R-410A at one time. Allow the recovery unit and cylinder
to cool before starting the next recovery job.
•
Always purge the machine completely when switching from R410a and back to prevent cross
contamination.
Following these simple hints will improve both recovery performance and compressor life.
4.2. Vapor/Liquid Recovery Procedures
Step
Description
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, the unit,
and A/C system as shown in Figure 1.
NOTE:
You must use an external filter drier in the
suction line in order to meet the conditions of the unit warranty.
Caution: If the 80% shutoff
cord is not used, a scale must be used to monitor the refrigerant level in the recovery
cylinder.
NOTE:
Although the 3600 was designed to handle liquid slugging, pumping large amounts of
liquid over extended periods of time will reduce the life of the compressor. If large amounts of
liquid are present, it is recommended that you use the liquid push - pull method of recovery
prior to vapor recovery operations. (See Figures 3 & 4).
3
Place the inlet and purge ball valves in the “CLOSED” position and the outlet valve is in
the “OPEN” position
.
Open the DOT recovery tank liquid valve. (See Figure 2).
4
Turn the system switch to the “ON” position
. The LED status display will be green.
5
Regulate the inlet port ball valve when liquid refrigerant is present
.
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 and will void the compressor
warranty.
