3 days ago, I have 3.5 ton 14 Seer Goodman Condenser with matching a-coil and furnace installed by a local contractor. During the start up process, I noticed the technician did not follow the instruction in the manual. Manual suggests the vacuum pump be run for min 30 minutes, he probably vacuumed the lines for 15 minutes. Also, to measure the super heat, he did not follow the chart provided by the manual. When I asked, he said he had his own chart that he uses for measuring super heat. In addition, he said factory charged refrigerant was enough that he was not going to add refrigerant to the system. But manual requires that if the refrigerant lines are more than 15 feet [mine is 32] refrigerant be added. When I mentioned this to him, he said his test results did not show more refrigerant is needed, nevertheless he finally added some. In the end, the tech told me if I am getting 20F difference between supply and return air, then the system is working fine and this is what matters. Based on his temperature measurement he told me I am getting 20 F difference, so everything is OK. Does that sound right to you? Is this a common practice to ignore factory standard and follow a chart the tech familiar with to start the system up?
Thanks in advance for the info.