Correct line sizing is imperative to optimize the performance of the system. Undersized lines will result in high pressure drops, diminished capacity, and increased power requirements. An oversized suction line will lead to poor oil return (as oil and refrigerant do not mix) and premature compressor changeouts.
When the capacity of the refrigeration system is reduced, it is usually because of a pressure drop in the refrigeration lines. Therefore, it is important to keep the refrigeration lines as short as possible, use as few fittings as practicable, and be especially careful not to kink the lines.
Keep your layout as simple as possible. Properly support the piping to absorb vibration and the normal expansion and contraction caused by temperature changes.
Note: Some planning may be required to ensure that the piping does not present a safety hazard, obstruct the normal operation of the equipment, or restrict adjoining spaces.
MORE INSTALLATION TIPSThe following pointers will also help you design and install relatively trouble-free piping.
Melvin is senior engineer at Master-Bilt Products, a division of Standex International Corp. Information on the company may be obtained at www.master-bilt.com (website).
Publication date: 12/02/2002