Air Cooled Unit Piping - Data Aire gForce Ultra User Manual

be designed so as not to trap oil and to prevent oil and refrigerant migration back to
the compressor during off-cycles.
Piping should be designed with adequate three-dimensional flexibility. It should not be
in contact with the surrounding structure, unless a proper tubing mount has been
installed. This protection proves necessary to avoid excess vibration, which can
ultimately result in connection or tube failure due to fatigue or wear from abrasion.
Aside from tubing and connection damage, excess vibration may be transmitted to the
surrounding structure and generate an unacceptable noise level within the structure as
well.
When piping, use copper tubing with appropriate supporting devices (supporting
saddles, etc.). All field piping must be installed according to local codes. Avoid piping
runs through noise-sensitive areas, such as office walls and conference rooms. Refer to
Section 9.0 - Piping for piping guidelines and to the ASHRAE Refrigeration Handbook for
general, good-practice refrigeration piping.
All piping below the raised floor must be located so that it does not restrict airflow.
Plan the piping layout under the raised floor to prevent the airflow from being blocked.
When installing piping on the subfloor, it is recommended that the pipes be mounted in
a horizontal plane rather than stacked one above the other. Whenever possible, the
pipes should be run parallel to the airflow.
Ensure that the tubing surfaces to be brazed are clean and that all burrs have been
removed from the ends of the tubes. Ensure that all loose material has been cleaned
from inside the tubing before brazing. Keep piping clean and dry, especially on units
with R-410A refrigerant.
The units may be ordered with top or bottom connections.

2.7.1 Air Cooled Unit Piping

Air-cooled unit piping is crimped and brazed closed from the factory and contains a
nitrogen holding charge. Each installation requires field-supplied refrigerant piping to a
condenser.
Refer to section RECOMMENDED LINE SIZING charts on page 125 for a guideline on
sizing refrigerant lines. The ultimate responsibility for line size selection is that of the
installing contractor or project engineer. Data Aire does not assume this responsibility.
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