Even a premium split-system can perform poorly if it’s installed with small but critical errors. In Oxnard, where systems often work hard during warm seasons, three issues cause most call-backs: condensate drainage, refrigerant line set routing (“trassa”), and vacuuming. Drainage problems usually show up as water dripping indoors, musty odors, or mold near the indoor unit. Typical mistakes include insufficient slope on the drain line, long horizontal runs without support, missing insulation on sections that sweat, or a poorly designed trap that blocks flow. The drain should run continuously downhill, be securely fastened, and terminate where water can discharge safely without staining walls or patios. Line set routing errors can lead to noise, vibration, reduced efficiency, and future leaks. Common causes are tight bends that kink the copper, undersized or oversized tubing, sharp transitions near the flare connections, or exposed lines left unprotected from sun and mechanical damage. The line set should be sized to the manufacturer’s specs, routed with gentle bends, properly insulated, and protected with a line-hide or conduit where needed. Skipping proper vacuuming (or doing it “fast”) is one of the most expensive mistakes. Moisture and air left in the system can create acids, ice formation, and compressor damage. Correct practice includes pressure testing with dry nitrogen, then pulling a deep vacuum with a micron gauge, confirming the vacuum holds, and only then releasing refrigerant charge per specifications. Getting these three steps right prevents leaks, keeps energy use low, and extends equipment life.
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