5.2 Field Piping Guidelines
One discharge line and one liquid line must be field-installed for each circuit of the indoor unit and the
outdoor condenser(s). Dual circuit condensers are available for most dual circuit indoor unit applications.
Refer to Figure 5.1 on page55 throughCondenser piping for single-circuit condensers (with Liebert Lee-
Temp™) on page63 for additional field-installed piping needed at the condenser. This piping is needed
for proper system performance and for installation/interconnecting receivers and head pressure control
valves for Liebert Lee-Temp™ systems.
NOTE: Keep the evaporator unit and condenser closed with their factory charge of inert gas while all
field piping is installed. Keep the field piping clean and dry during installation, and do not allow it to
stand open to the atmosphere.
When all the field interconnecting piping is in place, vent the condenser’s inert gas charge and connect
to the field piping. Finally, vent the evaporator unit’s charge of inert gas and make its piping connection
last.
Follow all proper brazing practices, including a dry nitrogen purge to maintain system cleanliness.
The condenser connection pipes must be wrapped with a wet cloth to keep the pressure and
temperature sensors cool during any brazing.
Vertiv | Liebert® MC™ Installer/User Guide | 61
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