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Nu-Calgon 4300-30 Rx11-flush Liquid

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Price: $56.09
Manufacturer Name: Nu-Calgon
Manufacturer Part No: 4300 30

Nu-Calgon 4300-30 Rx11-flush Liquid (19.5 fl. ounce Unpressurized Can)

Rx11-flush Liquid is a new and improved chemistry that is the next generation in flushing technology. It remains a constant boiling solvent and is now stronger, faster acting and dissolves more oil, moisture and contaminants than any other flush. It is ideal for line sets, burnouts and other flushing requirements.

It is sold in a 19.5 fl. ounce unpressurized can as well as in a Starter Kit, which consists of Rx11-flush Liquid, Rx11-flush Liquid Tank, Rx11-flush 24˝ Hose, and Rx11-flush Gun.


This product must be used in accordance to the following directions by HVACR professionals only.

Flushing Line Sets

Use Flush Tank and accessory tools in Rx11-flush Kit (4300-38) for the following procedures.

  1. Establish one end of the line set as the exit point and crimp or restrict it in order to increase mass flow and contact time.
  2. Place a re-sealable recovery container at the exit point to capture the used flush/oil mixture.
  3. Attach Flush Hose with Flush Gun to the outlet side of the Flush Tank valve (opposite the ball valve).
  4. Unscrew top and pour Rx11-flush Liquid into the Flush Tank (Tank will hold up to 24 ounces of Rx11-flush Liquid). Reassemble components, then attach the hose from a pressure regulated nitrogen tank to the inlet side (ball valve side) of the Flush Tank.
  5. Set the pressure regulator to deliver 50 psi of nitrogen. Then, slowly open the inlet ball valve to pressurize Flush Tank. DO NOT EXCEED 200 PSI. After pressurizing the injector tank, close both valves and remove the nitrogen fill hose. Never flush with nitrogen attached to Flush Tank.
  6. Insert Flush Gun in entry port of line and inject flush. One can of Rx11-flush Liquid will typically clean 3 line sets. Results will vary according to contamination level and tubing diameter.
  7. After injecting the Rx11-flush Liquid, proceed to purge the lines with 120 psi nitrogen, capturing the solvent/oil residue in the recovery container. Clear flush solvent indicates the lines are clean. If the exiting solvent is not yet clear, repeat flush procedure.
  8. Pull vacuum to remove any residual solvent. Line set is now clean and ready to service.

Flushing After Burnouts

  1. If possible, flush system in sections.
  2. Disconnect compressor and electricity. It is recommended that TXV’s and capillary tubes also be disconnected or by-passed, but is not required.
  3. Remove filter driers.
  4. Follow flushing instructions above.
  5. After flushing, evacuate system, leak check, and add oil and refrigerant if satisfactory. If appropriate, charge system with Rx-Acid Scavenger® (4301-02) as insurance to protect against acid contamination.

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