I completed the scheduled maintenance agreement cooling tune up on a Lennox air conditioner. I visually inspected the unit. Checked voltages, amps and pressures. I inspected the evaporator coil. I checked the temperature difference across the coil. Inspected heat pump. Checked refrigerant charge, voltages and amps. I rinsed the condenser coils with water. I found that unit is undercharged with R22 refrigerant. Unit is under deck and had a lot of debris in coils and around bottom of base. I rinsed coils before starting tuneup outside. Customer informed me that they want to wait to add refrigerant to system. See if they can get through the rest of the summer. Sidenote: I noticed the valve caps were missing from unit when they went to gauge up. Cycled and monitored system. All operating normally at this time.
