Piping between the drycooler, any external pump and the cooling unit is required to complete the system.
Properly-sized pipes will help reduce pumping power and operating costs. Pipe material choices are typically copper,
plastic or steel/black iron. Consult glycol and pipe manufacturing literature for compatibility and sizing assistance.
Galvanized piping should not be used. Any copper piping installed should be “L” or “K” refrigerant-grade copper.
Drycooler supply and return connections vary in size and number. See Table 5.3 on page34, and Table 5.4 on page35.
Consider the following guidelines when planning and performing the piping installation:
• Follow local piping codes, safety codes.
• Qualified personnel must install and inspect system piping.
• Do not hang or suspend piping from the drycooler-tube sheets protruding below the finned sections of the coil.
• On multiple-pump packages install a check valve at the discharge of each pump to prevent back-flow through
the standby pump(s).
• To extend the service life of the drycooler and pumps, install 16-20 mesh-screen filters/strainers in the supply
line to the pumps. The filter/strainer(s) should be easily replaced or cleaned.
• Consider Installing hose bibs at the lowest point of the system to facilitate filling.
• Keep piping runs as straight as possible, avoid unnecessary bends, and minimize additional fittings.
• Isolate piping from the building with vibration-isolating supports. Use soft, flexible material to seal between
pipes and wall openings to prevent pipe damage.
• Use welded or high-temperature soldered joints where possible. Threaded pipe joints, if needed, can be made
with tightly drawn Teflon™ tape.
• Clean and prepare all pipe connections before joining. Be careful not to allow solder/joining debris to get inside
the lines during the connection process.
Vertiv | Liebert® Drycooler Installer/User Guide
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