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2.0 PIPING
2.1 Air Cooled Unit Piping
Refer to the attached line sizing chart on page 29 for a guideline for sizing refrigerant lines. The
ultimate responsibility for line size selection is that of the installing contractor or design engineer.
Data Aire does not assume this responsibility. The chart covers distances up to 200 equivalent feet.
For installations beyond this distance, consult ASHRAE or similar references.
Standardpipingpracticemustbeusedtoensureproperoilreturnandefcientoperation.
The interconnecting lines to the remote air cooled or condensing unit must be installed by
aqualiedrefrigerationmechanic.
2.1.1 Discharge Lines
Discharge lines, also called hot gas lines, should be trapped at the top (inverted) and bottom as
well as every 15 to 20 feet of vertical rise. Discharge check valves are required on all installations,
especially those where there are long pipe runs or cold climates. For air-cooled units built after
3/14/2017, the discharge check valves are already installed inside the evaporator section and do
not need to be installed external to the unit. For units built before this date, the check valves must
beeldsuppliedandinstalledexternallytotheevaporatorsection.Ifthereisdoubtastowhether
or not the check valve is already installed in the unit, look for it on the hot gas line close to the exit
point of the unit (see example picture below). The externally installed check valve should be placed
from six (6) to ten (10) feet (1.8 to 3.1 m) from the compressor.
Note: Picture is only intended to show an example of a common check valve installation.
Itmaynotrepresentyourspecicunit,checkvalvesize,locationororientation.
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