The condenser unit (external) is connected to the evaporator unit (internal) through a copper pipe and an electric cable that ensures the connection of the control and power circuits between the units. For interconnection of the refrigerant circuit between the units a copper pipe is used, whose diameter is defined by the capacity of the system, by the difference between the units. Once the diameters, lengths and risers have been defined, we can install the pipes. First we mark the path of the pipes and we provide the necessary procedures for the passage of this pipe. After that we must carry out the preparation of the pipes with welding and checking procedures.
When more than one condensing unit is installed on site, the minimum distances specified in the equipment catalog must be observed. Recommended minimum clearances are as follows: 20 centimeters between the condensing units, so that the discharging air flows of the units are parallel. Another important point is that the direction of the discharge air flow should always be in favor of the prevailing local wind.
When the condensing unit is above the evaporator unit, a siphon must be run in the suction line for each 3m of unevenness between units. This procedure is done to allow the oil to return to the compressor.
When the evaporator unit is above the condenser unit, a siphon should be run at the outlet of the evaporator unit in the suction line, which should have its upper curve at a level above the evaporator unit. This prevents the return of liquid to the compressor after the system is shut down. For electrical interconnection of the units, we use two cables: one cable for power interconnection and another cable for interconnection of the commands. Having defined the cables and their gauges according to the equipment, we attach the cables to the already insulated copper pipe, thus forming a unique set. Next we apply a vinyl tape to the assembly to produce what is called a "vapor barrier", responsible for preventing condensation and early deterioration of the insulation of the fluid pipe. A power outlet must be installed near the condenser unit to connect the equipment. This outlet must be sized according to the capacity of the equipment. Do not forget to install the ground wire.
An important detail in the installation is the correct positioning of the units in relation to walls, floors, ceilings and obstructions. The evaporator unit must always be positioned so that the inflation air flow is parallel to the wall with the greatest length. Wherever possible, center the appliance on the wall in accordance with minimum clearances. The unit should be installed at least 1.50 m high and 0.30 m away from the side walls and ceiling. These deviations are important to avoid the return and short circuit of the air. The condenser unit should be installed in a level and level location. This location should have sufficient structural strength to support the unit and maintenance personnel. The location chosen should have sufficient space to ensure the required clearance and to carry out the installation and maintenance procedures.
