CPS Pro-Set TR21E Owner's Manual - Page 6

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CPS Pro-Set TR21E Owner's Manual

HIGH SPEED DIRECT LIQUID RECOVERY

The following is recommended to maximize recovery rates;
A. Use the shortest length of 1/4" ID Refrigeration hose on the suction side and discharge side of the unit.
B. If the refrigerant is clean, remove all suction side filters, screens, etc...
C. Remove all Schrader type valve cores and any valve depressors from the hoses and service valves.
D. Use an evacuated DOT tank.
E. Install a hose between the DOT recovery tank and vapor service valve on the A/C system being
serviced. (See Diagram 2)
F. Use 90lb DOT recovery tank or larger to minimize tank change over.
1. Connect the unit as shown in Diagram 2. The technician will need to use a refriger-
ant manifold (with sight glass) and two spare hoses. The manifold should be con-
nected between the unit being serviced and the TR21 IN port. Connect a refrigerant
hose from the TR21 OUT port to an evacuated DOT recovery tank liquid valve. Con-
nect another refrigerant hose from the DOT tank vapor port to a service port of the
unit being serviced. Note: The recovery tank must be rated for (38 bar) 550 PSI.
2. Open both the vapor and liquid valves on the DOT recovery tank.
3. Keep the manifold valves closed at this time.
4. Push the main power switch "ON".
5. Once unit has started, open the LO manifold valve on the manifold to start the liquid
refrigerant flow to the TR21. Monitor the liquid refrigerant flow in the manifold sight
glass.
Note: The TR21 is designed to directly recover large amounts of liquid refrigerant. If during
vapor recovery process the compressor begins to make a slugging or hammering noise, meter
the incoming liquid refrigerant by closing the low side manifold valve until the noise subsides.
6. Once liquid refrigerant is no longer present in the manifold sight glass, close the DOT
recovery tank vapor valve. This will transition the unit into direct vapor recovery.
7. Allow the TR21 to run continuously. When a 10" hg. vacuum is observed on the low
side manifold gauge, close both the LO & HI side manifold valves off.
8. If the pressure on the LO side manifold gauge starts to rise, open LO side mani-
fold valve and restart the TR21. lf the LO side manifold gauge remains in a vacuum,
close all tank, manifold and hose valves. Remove discharge hose from TR21 outlet
port. Recovery and Self-Clearing are now complete.
A/C System
Being Serviced
LIQUID
VAPOR
A/C System
being serviced
Hose From Dot Recovery Tank Vapor Port To A/C System Vapor Port
6
Diagram 2 - High Speed Direct Liquid Recovery
Refrigerant
Manifold Set
IN
IN
Optional Tank Overfill Sensor Cord
From OUT Port To
Tank Liquid Valve
Refrigerant
Recovery
Unit
OUT
Optional Tank
Overfill Switch
DOT Recovery
DOT Recovery
Tank
Tank
High Capacity Charging Scale