Refrigerant R410a system with industry-leading lowest comparable total charge * These models are for 2-Pipe Heat Pump and 3-Pipe Heat Recovery Installation. Use High Pressure (HP) gas size only for 3-Pipe Heat Recovery Installation ** Indicates 1″ Connection. Please contact Logicool for final pipe sizing and schematics Note that the above table details FSXNSE Standard-Efficiency … Continue reading Set-Free Sigma Standard Efficiency 2/3 Pipe