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Introduction The refrigerant line set is often the quiet hero of a successful installation. In a commercial retrofit, a rooftop unit sits idle until the line set delivers clean refrigerant, flawless insulation, and a connection that won’t fail under the stresses of long runs, UV exposure, or temperature swings. I’m Rick Callahan, PSAM’s in-house technical advisor, and I’ve spent decades chasing down leaks, fighting field-wrap failures, and tuning line s..."

2026-07-02T06:43:00Z

Created page with "<html><p> Introduction The refrigerant line set is often the quiet hero of a successful installation. In a commercial retrofit, a rooftop unit sits idle until the line set delivers clean refrigerant, flawless insulation, and a connection that won’t fail under the stresses of long runs, UV exposure, or temperature swings. I’m Rick Callahan, PSAM’s in-house technical advisor, and I’ve spent decades chasing down leaks, fighting field-wrap failures, and tuning line s..."

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Line Sets in Commercial Applications: What to Know - Revision history