Why VRF Systems Leak
VRF systems use extensive refrigerant piping networks, sometimes running hundreds of feet through walls, ceilings, and vertical risers. Every brazed joint, flare connection, and Schrader valve access port is a potential leak point. Over time, thermal cycling, building vibration, and corrosion weaken these connections.
A small leak is insidious. The system compensates by running the compressor harder, which increases energy consumption and accelerates wear. Building occupants notice gradually declining performance but the system keeps running. By the time the low-pressure safety trips and the error code appears, the system may have been leaking for months.
R-410A refrigerant is expensive ($15–30 per pound, and a commercial VRF system holds 20–80+ pounds). Repeated top-offs without finding and fixing the leak is throwing money away and damaging the compressor.
Our Leak Repair Process
Electronic Leak Detection
We use heated diode and infrared refrigerant detectors capable of finding leaks as small as 0.1 oz/year. For hard-to-access locations, we use nitrogen pressure testing with decay monitoring to isolate the leaking section.
Leak Repair
Once located, we repair the leak using proper brazing techniques with nitrogen purge to prevent internal oxidation. For flare connection leaks, we re-make the connection with new fittings and proper torque specifications.
System Evacuation
After repair, we evacuate the system to remove moisture and non-condensables introduced during the repair. Proper evacuation to 500 microns or below is critical for long-term system health.
Precision Recharge
We recharge the system to the manufacturer’s specification using digital scales and subcooling/superheat verification. VRF systems are intolerant of overcharge or undercharge, so precision matters.
Suspect a Refrigerant Leak?
Stop paying for refrigerant top-offs. Let Mountain Mechanical find and fix the leak permanently.