To bend a pipe, give the roundness as large as possible not to crush the pipe 
Connecting the pipe of gas side first makes working easier.
Use the same method on indoor unit. Loosen the screws on terminal block and insert the plugs fully into terminal block, then tighten the screws.
Insert the cable according to terminal number in the same manner as the indoor unit.
If wiring is not correct, proper operation can not be carried out and controller may be damaged. 
Fix the cable with a clamp.
If the HSU-1218CR03 specifications
The Haier HSU-1218CR03 is a cutting-edge air conditioning unit designed to blend efficient cooling performance with advanced technology, making it an excellent choice for both residential and commercial spaces. This model is characterized by its compact design, allowing it to fit seamlessly into various environments while providing optimal comfort.One of the standout features of the HSU-1218CR03 is its energy efficiency. Designed with the latest inverter technology, this air conditioner adjusts its cooling output based on the ambient temperature and the desired temperature set by the user. This not only ensures consistent comfort but also significantly reduces energy consumption, leading to lower electricity bills. The inverter technology allows the compressor to operate at varying speeds, minimizing power usage and reducing the frequency of start-stop cycles, which ultimately extends the lifespan of the unit.
Another significant aspect of the Haier HSU-1218CR03 is its advanced air filtration system. The unit is equipped with a multi-stage filtration process that effectively removes dust, allergens, and other airborne particles, creating a healthier indoor environment. This feature is particularly beneficial for individuals with allergies or respiratory conditions, as it helps to maintain a cleaner air quality in the living space.
The HSU-1218CR03 also boasts a user-friendly control system, often featuring a remote control and digital display panel. This allows users to easily adjust settings such as temperature, mode, and fan speed from the comfort of their couch or while lying in bed. Additionally, many models may include smart features, allowing integration with home automation systems, enabling users to control their air conditioning unit via smartphone applications.
Noise reduction technology is another characteristic that sets the Haier HSU-1218CR03 apart from other units. With an ultra-quiet operation mode, this air conditioner ensures that it does not disrupt daily activities or sleep patterns, making it suitable for bedrooms, offices, and other quiet environments.
In summary, the Haier HSU-1218CR03 combines energy efficiency, effective air purification, user-friendly controls, and quiet operation to provide an unparalleled cooling experience. Its versatile features make it an ideal solution for maintaining comfort throughout the seasons while also promoting a healthier indoor atmosphere. Whether for residential or light commercial use, this air conditioning unit represents a smart investment in climate control technology.