Traditionally there has been little use of high volume liquid flushing in HVAC Service. For years there has been a lot of blowing with Nitrogen and Cut-In-Cut-Out filtering associated with new compressor installs, which has sufficed (maybe, until now). We all know this filtering process can often require multiple return visits (filter changes); as the contaminations are allowed to circulate thru the system (and the new compressor).

The HVAC Industry is increasing its awareness of the importance of coil cleanliness in refrigeration systems. Compressor manufacturers have determined that more than 95% of compressor burnouts and failures are related to contaminated or dirty systems. Source:

Flushing has become more of a hot topic and true issue today with the refrigerant changeover (R-22 phase-out) and the need to flush and clean up the circuits (coils and line sets being reused), especially when doing a lubricant changeover. The good news is, without the chlorine; acidic issues are going to become much less of a concern.

We learned from the Automotive HCFC to HFC conversion, that residual Mineral oils (previously used with a chlorinated refrigerant) will cause problems when mixed with the new synthetic oil and refrigerant. Chlorine atoms remain trapped in the used Mineral residues (not removed), and reacted with the new oil and refrigerant to form solids and chemical “plating”. Furthermore, the new synthetic oils themselves have higher solvency; so if you have a dirty, contaminated, reacting system, the internal walls are going to be partially washed, slowly migrating (oozing) its way back to the compressor.

Times are changing, and there is clearly a need for a better understanding and an open mind to new methodology. Purging with Nitrogen is not flushing; other than producing some oil “glide”, a gas is not going to wash out anything. The Expensive, ineffective, low flow, low volume Aerosol Products are not the answer either. Many of these products are refrigerant based and will evaporate too fast to liquid wash all the surfaces (like bringing a knife to a gun fight). Other than replacement (not always an option), liquid flooding and flushing of the internal surfaces, is the only way to properly clean them.

Energy enhanced scrubbing with the liquid is a plus, and HECAT® has the answers. Our long transportation history has allowed us to provide flushing solutions for HVAC style climate control systems used in commuter and passenger trains, military and passenger ship zone systems, and more. Our engineering focus on internal cleaning, with a deep understanding of A/C system operation, lubricants, and contamination; transitions well. We may be seen as a new face to the HVAC industry, but we are not new to this game.

If portability (carrying) and vehicle storage is a concern, you will want to look at the FAC-200 PULASATOR® A/C Component Flusher, the PULSATOR® FLUSH GUN, and our SAFE-FLUSH® solvent. For more extensive process work, you will need to look at the FAC-400 PULSATOR® A/C Component Flusher. Filtering-Recycling and reusing the solvent is both cost efficient and effective; like when you have 100+ apartments to convert, and all the line sets are to be reused.

Although the current commercial PULSATOR® units above are very capable of cleaning some very large system coils; we have developed, prototyped, and proven even larger volume and higher pulse flow processes. So don’t hold back about contacting us regarding your “big” problems, we are here to help, and we do have answers.


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