Piping Guidelines-Air-Cooled Units; Refrigerant Piping-Air-Cooled Models; Figure 14 Top Refrigerant Piping Connections; Figure 15 Bottom Refrigerant Piping Connections - Emerson Liebert CRV User Manual

6.1 Piping Guidelines—Air-Cooled Units
• Indoor unit ships with a nitrogen holding charge; do not vent the evaporator until all refrigerant
piping is in place, ready for connection to the unit and condenser
• Use copper piping with high temperature brazed joints
• Isolate piping from building using vibration-isolating supports
• Refer to Tables 7 through 10 for piping sizes
• Refer to condenser installation manual for charging information
• Install traps on hot gas (discharge) lines at the base of vertical risers and every 15 feet (4.6m) of
vertical rise.
• See Table 6 for the allowable elevation difference between the condenser and the Liebert CRV.
• Consult factory if piping run exceeds 300 feet (91m) equivalent length
• Keep piping clean and dry, especially on units with R-410A refrigerant
• Avoid piping runs through noise-sensitive areas
• Do not run piping directly in front of airstream of any air conditioner
• Refrigerant oil – do not mix oil types
Refer to ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping.
6.2 Refrigerant Piping—Air-Cooled Models

Figure 14 Top refrigerant piping connections

Figure 15 Bottom refrigerant piping connections

19
Refrigerant Connections
If using bottom
connections, cut
the pipes just
below the black
pipe clamps
® ™
Liebert CRV