The purpose of this document is to provide a clear communication regarding insulating the external copper refrigerant lines.
Resolution:
Internal to the air conditioner the suction lines are cold – 40°F (4.4°C) – and cause condensation, even in conditioned spaces. In addition, any heat that enters the refrigerant adds to the superheat and reduces system efficiency. For these reasons, suction lines should be insulated with a vapor proof insulation. This is a requirement of many building codes. Insulated suction lines are covered on Schneider Electric’s end.If for some reason the suction line piping is not insulated please advised your Sr. TSE and, or TTL.
Liquid lines generally are insulated. They are warm to hot (110°F (43.3°C) for air-cooled). If liquid lines pass through a space that is warmer than the refrigerant (i.e. the roof of a building at roof level), or if they could be considered hot enough to pose a safety risk, then insulation should be added. Discharge lines are generally un-insulated. They may be very hot, in excess of 150°F (66°C), so insulation may be warranted as a safety consideration, or if the heat loss from the discharge gas line would be considered objectionable to the space.
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