CASE STUDY OF INVERTER AIR CONDITIONING LOGIC DURING UNDERCHARGE REFRIGERANT

Abstract

Preventive maintenance or regularly known as routine or scheduled maintenance of equipment and assets to keep them running and prevent any costly unplanned downtime from unexpected equipment failure. In preventive maintenance of residential air conditioning, the evaporator, condenser, air filter cleanness, running current, and refrigerant charge must be checked and recorded to ensure the design cooling capacity can be delivered. Failure to conduct preventive maintenance will lead to component clogging, high energy consumption, and component malfunction. Lack of refrigerant charge in the air conditioning systems will decrease the cooling capacity and energy efficiency. The main objective of this case study is to study the logic of three parameters which is compressor discharge temperature, expansion valve opening, and operation current for the R32 inverter air conditioner system while running in undercharge state. In achieving the objectives, some methods that need to be done. First, to find the suitable capacity of air conditioning by using the rule of thumb method. Next, the installation of wall-mounted inverter air conditioning is to be done, and observation of three parameters which is compressor discharge temperature, expansion valve opening, and operation current of inverter system that affected if the unit running in undercharge refrigerant capacity. From the result, it seems all three parameters all direct relationships with each other.  From the result, undercharging 10% of refrigerant will increase the 6-7oC compressor discharge temperature, increase 0.1 amperes of operation current (A), and 10-40pls the expansion valve opening. In a conclusion, new sets of data and information for inverter split unit air conditioning can be used for teaching and learning reference and can assist the troubleshooting work at the site as well.