CPS Pro-Set TRA21 Series, Operation Manual

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OPERATION
8
Liquid Flush
1. Connect the TRA21 to mobile A/C system LO side service port using the LO side of a
manifold. Do not connect the HI side of the manifold to the mobile A/C system. Keep
HI manifold valve closed throughout this process.
2. Connect the TRA21 discharge to the Vapor Port of the recovery tank. Recovery tank
should have at least 4 times the mobile system refrigerant charge.
3. Connect the Liquid Port of the recovery tank to the HI side service port of the mobile
A/C system. The user will need to provide this hose / coupler assembly.
4. Connect the Yellow Overfill Sensor Cord to the float in the recovery tank. This cord
is not included on the model TRA21E. For the TRA21E, use scale to monitor tank
weight. All connections should be done as shown in Diagram - 2.
5. Open the vapor valve on the recovery tank.
6. Start unit by pushing main power switch to the “ON” position.
7. Open the HI and LO side manifold valves to start the refrigerant flow.
8. Run for 15 minutes to allow liquid refrigerant to flood the mobile A/C system. The
liquid refrigerant will absorb the oil in the A/C system.
9. After 15 minutes, close the liquid valve on the recovery tank.
10. Monitor the LO side manifold gauge. Once the gauge reaches 20˝ HG vacuum, turn
the unit off.
11. Close vapor valve on the recovery tank.
12. Disconnect the hose from the TRA21 discharge, then a small amount of refrigerant
under pressure will be released.