We have a small 7 story residential building with R22 heat pumps, water cooled.
We have had this account for 6 years and never had head pressure problems till last month. The unit range from 2 to 4 ton in the apartments.
Last month one R-22 burned out its compressor and we bought the exact factory replacement with R410A. The unit head pressure was running up to 600 psi and would kick out on the saftey. (610)
Again, NO problems with any of the other R-22 in building at this time. Based on all info, the water flow for the unit is the same as per the R-22 unit we removed???
Has anyone had any pressure problem when you change them out from 22 to a 410 unit?? All piping the same,no reg valves, nothing but the unit was changed.