Liquid Line Piping

Installation

Liquid line sizes are based on their ability to provide a minimum of 5 degrees F (2.7ºC) of sub- cooling at the expansion valve throughout the unit’s operating system. Increasing the liquid line size does not increase the available sub-cooling. The uniform liquid line size, pre-selected in the Table below, are independent of the line length or rise within the permissible guidelines to maintain this minimum required 5 degree F (2.7ºC) sub-cooling at the expansion valve for a properly charged RAUC unit operating in a normal air conditioning application.

The liquid line should have a slight slope in the direction of flow so that it can be routed with the suction line.

The unit has a liquid line check valve that prevents liquid refrigerant from flowing backward through the liquid line, filling the condenser, and overflowing to the compressor during the “Off” cycle. A relief valve is also installed to prevent the build up of high pressure in the liquid line when the unit is off. For proper operation of the relief valve, the liquid line service valve should not be in the back seated position but cracked open so the relief valve (and the fan pressure switch) is open to the condenser. The line that connects the outlet of the 235 psig relief valve to the liquid line service valve must not be removed.

For more information, refer to the latest edition of Application Guide SS-APG001-EN.

1.Avoid putting liquid lines underground.

2.Route liquid lines as short and direct as possible.

3.Slope liquid lines away form the condensing unit 1-inch for every 10 feet.

4.Only insulate liquid lines that pass through heated areas.

5.Wire solenoid valves according to the field connection diagram for proper pump down operation.

6.The liquid line filter drier should be as close to the solenoid valve as possible.

Note: If the liquid line riser exceeds 10 feet, refer to Tube Size and Component Selection, publication number SS-APG001-EN

Liquid Line Interconnecting Tubing

		OD Vertical
Capacity	OD Horizontal (Per Circuit)	(Per Circuit)

20 Ton	5/8”	5/8”

25 Ton	7/8”	7/8”

30 Ton	7/8”	7/8”

40 Ton	5/8”	5/8”

50 Ton	7/8”	7/8”

60 Ton	7/8”	7/8”

Note: If risers exceed 10 feet, refer to Tube Size and Component Selection, publication number SS-APG001-EN

SS-SVX09A-EN

RAUC-C20, RAUC-C40, RAUC-C25, RAUC-C30, RAUC-C60 specifications

Trane, a leader in HVAC solutions, offers innovative air conditioning units designed for superior performance and energy efficiency. Among their advanced products are the Trane RAUC-C30, RAUC-C20, RAUC-C40, RAUC-C60, and RAUC-C50, which cater to various cooling and heating needs in residential and commercial applications.

The RAUC-C series showcases cutting-edge technology, ensuring effective climate control while minimizing energy consumption. These units are equipped with variable-speed compressors, allowing for precise cooling capacities and reduced noise levels during operation. This feature ensures that users can enjoy optimal comfort without the disruptive noise often associated with traditional HVAC systems.

One of the standout technologies used in the RAUC-C series is Trane’s advanced inverter technology. This system intelligently adjusts the compressor speed based on real-time cooling demands, enhancing efficiency and prolonging the unit's lifespan. Additionally, the units come with high SEER (Seasonal Energy Efficiency Ratio) ratings, making them an excellent choice for those looking to lower their energy bills while maintaining a comfortable indoor environment.

The RAUC-C series units are designed with durability in mind. Constructed with robust materials, these air conditioning systems are built to withstand varying weather conditions. Their compact and lightweight design makes installation straightforward, and they can fit seamlessly into a variety of spaces, from residential homes to commercial buildings.

Another key characteristic of the RAUC-C series is their eco-friendly refrigerant, which meets strict environmental regulations. This not only supports sustainability efforts but also ensures efficient cooling performance. Furthermore, their smart technology capabilities enable integration with modern smart home systems, allowing users to manage their cooling settings remotely for added convenience.

Trane's focus on user-friendly interfaces makes these units easy to operate. The intuitive control systems allow users to customize their cooling preferences easily, providing flexibility to adapt to individual comfort needs.

Overall, the Trane RAUC-C30, RAUC-C20, RAUC-C40, RAUC-C60, and RAUC-C50 stand out for their energy efficiency, advanced technology, durability, and user-focused design. These features make them reliable choices for anyone seeking efficient and effective heating and cooling solutions.