Arrived onsite for ac maintenance on 1 units. Asked customer to turn AC on to confirm operation. Checked all electrical. Chemically Cleaned outside unit, measured pressures for R22 at 56/156psi with 7 degree sub cooling with outside temperature at 60 degrees. Measured temperature drop at 20 degrees. Cleaned evaporator coil and blew out condensate line. System was icing up a bit but this may have been from the low outside temperature. We will monitor.
