RE: Return Line Icing
Ice or condensation forms on the refrigerant return line of holding plate refrigeration systems, so they are insulated all the way back to the compressor to eliminate the moisture. Adler Barbour and other similar ice box conversion units supply a three foot piece of insulated tubing to use on the lines just outside the box. In moderate temperatures and humidity three feet of insulation should be enough to prevent moisture on the lines outside the box. In hot humid climates it is a good idea to insulate both tubes together in a single insulation tube outside the box all the way to the condensing unit. There is one condition that will produce frosting on the return line and extend the compressor running time, and that is too much refrigerant in the system. The factory refrigerant charge will not cause this condition but if the system was field serviced with refrigerant that could cause the problem you describe.
Ice or condensation forms on the refrigerant return line of holding plate refrigeration systems, so they are insulated all the way back to the compressor to eliminate the moisture. Adler Barbour and other similar ice box conversion units supply a three foot piece of insulated tubing to use on the lines just outside the box. In moderate temperatures and humidity three feet of insulation should be enough to prevent moisture on the lines outside the box. In hot humid climates it is a good idea to insulate both tubes together in a single insulation tube outside the box all the way to the condensing unit. There is one condition that will produce frosting on the return line and extend the compressor running time, and that is too much refrigerant in the system. The factory refrigerant charge will not cause this condition but if the system was field serviced with refrigerant that could cause the problem you describe.
