Purge High-Pressure HVAC Line Set Flush | Aerosols PRG- 1, 2
Why flush when you can PURGE?
Standard “flushes” are often just low-pressure solvents that rinse the bottom of the pipe. Purge is different. By combining a proprietary high-concentration solvent with a 140+ PSI delivery system, Purge doesn’t just rinse—it obliterates obstruction.
The industry is full of “convenience” cans that lose pressure in cold trucks or fail to push solvent up vertical line sets. Purge is engineered for the reality of the job site. The elevated pressure ensures consistent velocity in low-temperature environments and long commercial runs, while the active formula chemically emulsifies the sludge, carbon, and acids that cause compressor burnout, turning those line sets into a like-new state.
Manufacturer’s Tech Note: We intentionally pressurize these cans to 140+ PSI because we know technicians leave them in freezing vans overnight or have to work inside walk-in coolers/freezers. Standard 55 PSI cans lose pressure in the cold and can’t push sludge up a vertical riser or through a long run. Purge maintains velocity even in tough conditions.
The Efficiency Math: Do More with Less
Because Purge relies on powerful active ingredients rather than propellant fillers, you get superior coverage per canister.
- 1 lb Canister: Services 3–6 Tons (vs. the industry standard of 3–4 tons).
- 2 lb Canister: Services 5–10 Tons (Best value for large systems).
Professional Application: Designed for the modern technician, Purge is the essential tool for R-410A retrofits, A2L system conversions, new component installation, and heavy-duty burnout maintenance.
| KEY FEATURE / SPECIFICATION | TRADE BENEFIT / RESULT |
|---|---|
| 140+ PSI Delivery Pressure | Mechanical Scrubbing Force: Delivers nearly 3x the pressure of generic brands. Maintains high velocity to blast through long vertical runs and restrictive line sets without losing pressure in cold weather environments. |
| High-Yield Economy (3–10 Tons) | Cost Reduction: High-concentration formula means less propellant and more active solvent. One can often replaces two competitor cans.
• 1 lb Can: Cleans 3–6 Tons. |
| High-Solvency Emulsification | Rapid Contaminant Removal: Chemically dissolves and suspends stubborn carbon residues, tars, oils, and acids from compressor burnouts, preventing redeposition in the line. |
| Non-Flammable & A2L Ready | Future-Proof Safety: Fully compatible with modern A2L (R-32, R-454B) conversions and R-410A retrofits. Non-toxic, non-flammable formula ensures job-site safety. |
| Zero-Residue Evaporation | System Protection: Low-boiling point formula evaporates completely under standard vacuum, leaving no oily film or residue to contaminate the new refrigerant charge. |
| Material Compatibility | Safe for Metals: Engineered to be safe on copper, aluminum, steel, and elastomers. Intended for line sets and coils only. Always bypass, remove, or isolate metering devices (TXV/piston), filter driers, and compressors prior to flushing to avoid trapping debris. |
| Application Requirement | Best Practice: For optimal results, always purge with clean, dry nitrogen after injection to push remaining solvent out, then evacuate the system prior to recharging. |
Part Number Reference:
Select the right capacity for your job. Choose between standard aerosols for maintenance or complete kits to get started.
1. Select Your Aerosol or Kit
| PART # | SIZE / PACK | APPLICATION FIT |
|---|---|---|
| PRG-1 | 1 lb Aerosol (Case of 6) |
Residential / Service: Cleans 3–6 Tons. The industry standard size for residential repairs, burnouts, and retrofits. |
| PRG-2 | 2 lb Aerosol (Case of 4) |
Commercial / High-Yield: Cleans 5–10 Tons. Best value for commercial systems, long vertical runs, or multiple residential jobs. |
| PRG-1K / PRG-1K-X3 | 1 lb Kit (Available 1ea or 3/cs) |
Starter Kit: Includes 1 lb canister + Actuator Valve/Gun. Everything needed to start Purging immediately. |
| PRG-2K | 2 lb Kit (Sold Individually) |
Master Kit: Includes (2) 2 lb canisters + 1 Actuator Valve. Heavy-duty capacity for large scale contamination removal. |
2. More Configurations & Accessories
| Cylinders | Large Cylinders (5 lb & 10 lb) Need to flush a VRF or Chiller? Switch to our bulk cylinders for massive volume and high pressure. |
| Tools | Purge Accessories Find replacement injection valves, hoses, and adapters. |
| More Kits | Purge Kits View all available Purge kit configurations. Everything you need to get Purging. |
Contractors: Please contact your local Vapco distributor for pricing and availability.
Directions for Purge High-Pressure HVAC Line Set Flush Aerosols:
Safety & Hazard Warnings
- DANGER: Nitrogen Back-Pressure. Never connect the Purge canister directly to a Nitrogen line via a manifold. If Nitrogen back-pressure enters the aerosol can, it may burst.
- Ventilation: Use only in well-ventilated areas. If flushing indoors, open windows or use fans to exhaust fumes.
- PPE: Wear safety glasses and chemical-resistant gloves. Purge is a high-strength solvent that degreases skin instantly.
Phase 1: System Preparation
Before cracking the seal, ensure the system is isolated to prevent damage to sensitive components.
- Isolate & Protect:
- Compressors: Never inject solvent directly into a compressor.
- Metering Devices: Bypass or remove TXVs, pistons, and filter driers. Solvent can lodge debris in these small orifices.
- Large Components: If the system has a receiver or accumulator, inspect it visually. If heavily contaminated, bypass and clean separately or replace.
- Establish Flow Path:
- Disconnect the line set from the indoor and outdoor units.
- Whenever possible, plan to flush from the inside – out to the exterior. This moves fumes and contaminants outside.
- Place a bucket or waste container at the exit point to capture the solvent and sludge.
- High-Pressure Connections (Critical Step):
- Because Purge operates at 140+ PSI (significantly higher than standard flushes), hand-tightening may not be sufficient.
- Gently wrench-tighten the connection between the injection valve and the hose, and the hose to the flush gun.
- Caution: Do not over-tighten to the point of stripping threads, but ensure a firm, pressure-proof seal.
Phase 2: The Flushing Process
Leverage the high pressure and chemical solvency to scrub the line.
- The “Pro Tip” Restriction:
- Crimp the Exit: Use pliers to slightly crimp or restrict the end of the copper discharge line.
- Why? This creates back-pressure, forcing the liquid solvent to fill the volume of the pipe completely (increasing contact time) rather than just running along the bottom of the tube.
- Inject Purge:
- Connect the canister to your injection tool. Hold the canister upright.
- Inject solvent in short, controlled bursts based on tubing diameter:
- Up to 1/2″ Tubing: 10–20 second burst per 50 ft.
- Up to 7/8″ Tubing: 30–40 second burst per 50 ft.
- The Nitrogen Chase (Mandatory):
- Do not rely on the can pressure alone.
- Immediately after the solvent injection, disconnect the Purge canister and connect compressed Nitrogen (set to ~50 PSI).
- Blast Nitrogen through the line. This acts as a squeegee, driving the “plug” of solvent and suspended debris out of the line set.
Phase 3: Verification & Completion
Ensure the line is chemically clean and dry.
- Inspect the Discharge:
- Look at the waste container. The fluid will likely look dark/black initially (carbon and oil).
- Repeat: If the solvent exiting the line is not clear, repeat Steps 5 and 6 until the discharge runs clear and colorless.
- Evacuation:
- Once the line is clear, pull a deep vacuum on the line set.
- Purge is formulated with a low boiling point to flash off rapidly under vacuum, ensuring no chemical residue remains to contaminate the new refrigerant charge.
- Disposal:
- The waste container now holds hazardous contaminants (old oil, acid, sludge). Dispose of the waste solvent in accordance with local, state, and federal regulations (typically in a waste oil container).
