Robinair RG3000 Refrigerant Recovery Machine - Manual (Page 7)

7
o
Perating
i
nStructionS for
b
ulk
l
iquid
S
yStemS
“Push – Pull” Procedure
The push – pull method removes bulk liquid from a system using the pressure differential created by the
unit. This method works only with large systems where the liquid is readily accessible; it may not work on
systems that contain less than 15 lbs. (6.8 kg) bulk liquid.
Outlet Fitting
Vapor
Inlet
Fitting
Liquid
System Being
Serviced
Sight
Glass
Liquid
Scale
Filter/Drier
Recovery
Cylinder
Vapor
1. Place the unit on a flat, level surface.
2. Connect a hose from the outlet fitting of the unit
to the vapor port on the system being serviced.
3. Connect a hose from the inlet fitting of the unit
to the vapor port of a recovery cylinder. Promax
recommends using a filter / drier in this line.
4. Connect a hose from the liquid side of the
recovery cylinder to the liquid port of the
system being serviced. Promax recommends
using a sight glass in this line as a method of
determining when the liquid has been removed.
5. Place the recovery cylinder on a scale (such as
TIF9010A) to avoid overfilling the cylinder.
6. Verify inlet and outlet valves on unit are closed.
7. Open the recovery cylinder valves.
8. Open the outlet valve on the unit.
9. Toggle the power switch ON.
10. SLOWLY open the inlet valve on the unit.
11. When the weight reading on the scale stops
increasing, close the inlet valve on the unit
first; then close the liquid valve on the recovery
cylinder.
12. Toggle the power switch OFF.
13. Close the valves on the recovery cylinder, and
close the outlet valve on the unit.
14. Proceed to Vapor Recovery.
WARNING : Manually close the valves on both
the storage cylinder and the unit to prevent overfilling
the cylinder. Once the siphon is started, it can overfill
the storage cylinder, even if the cylinder is equipped
with a float level sensor. The siphon can continue
even when the unit is turned off.
Liquid Recovery
This method is used :
• on systems with receiver cylinders.
• on systems containing more than 20 lbs.
(9.1 kg) of refrigerant.
• when transferring bulk liquid refrigerant
from one cylinder to another.