Storage; Piping - Data Aire gForce Ultra Installation, Operation And Maintenance Manual

NOTE: Seal openings around piping and electrical connection to prevent air
leakage. Failure to do so could reduce the unit's cooling performance.
2.6

Storage

Your Data Aire equipment comes ready for immediate installation. In some instances it may be neces-
sary to store the equipment for a period of time. If you must store the equipment it should be done in
a dry area, out of the weather, protected from damage by other equipment in storage or transportation
equipment, never stacked, and avoid frequent relocation.
If equipment is stored for longer than 30 days special precautions must be taken to avoid coil damage.
All coils should be charged and sealed with a low pressure (i.e., 1 to 3 PSIG, (7 to 21 kPa)) inert gas,
such as nitrogen. This prevents contaminates from entering the coils: then when the seal is broken at
installation, the rush of escaping gas verifies the coil is leak free. If coils are not charged and sealed
condensation mixes with air pollutants forming a weak acid and over time can cause pin hole leaks to
develop in the coil tubes.
When equipment is installed after storage, caution should be taken to inspect and replace, if required,
rubber components. All moving parts, such as fans and motors, should be hand tested to ensure that
they are free and clear prior to start-up. Finally, verify that all lubrication fresh and full.
2.7

Piping

Proper piping practices should be employed to ensure adequate oil return, even under minimum load
conditions with special consideration given to the size and proper slope of the tubing coming from the
evaporator. Tubing returns from the evaporator should 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 11.0 - 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 braz-
ing. Keep piping clean and dry, especially on units with R-410A refrigerant.
The units may be ordered with top or bottom connections.
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