Performed preventative maintenance for a spacepak blower coil unit. Model #esp4860j, serial #j2102456668000058. Upon arrival the system was set for heat. I powered down the thermostat and removed the access panels. The evaporator coils are clean and in good condition. I tested the drain pan and drain line to ensure that there are no leaks or clogs. I replaced the air filter size 20x25x1 located in the return grill in the hallway. I checked all electrical connections to ensure that they are secure and in good condition. I re attached the access panels and called for AC. I observed the system starting normally. The condenser coils are clean and in good condition. The condenser amp draws are 1.0 for the fan and 7.4 for the compressor. The temperature split is at a 20° differential. The disconnected duct I was able to re attach and permanently secured it. The system is operating properly at this time.