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•
A pure dry nitrogen flow of 1-3 ft
displace the air. Control the flow using a suitable measuring device.
•
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.
•
Protect all refrigerant line components within 18 in. (460 mm) of the brazing site by wrapping
them with a wet cloth or with a suitable heat-sink compound.
•
Isolate piping from building using vibration-isolating supports.
•
Condensers with receivers cannot be installed below the evaporator. The maximum height of
the condenser above the evaporator is 60 ft (18.3 m).
Consult the factory before installing units, condensers, and receivers outside these parameters.
•
Consult factory if piping run exceeds 300 ft (91 m) actual length or 450 ft (137.2 m) equivalent
length.
•
Install traps on hot-gas (discharge) lines at the base of vertical risers over 5 ft (1.5 m) and every
20 ft (6 m) for vertical rises over 25 ft (7.6 m), then install a trap in 20-ft (6-m) increments or
evenly-divided over the vertical rise.
•
Pitch horizontal hot-gas piping down at a minimum rate of 1/2 in. per 10 ft (42 mm per 10 m) so
that gravity will aid in moving oil in the direction of refrigerant/oil flow.
•
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 discharge air stream.
•
Refrigerant oil – do not mix oil types (see
Refer to ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping. The indoor
cooling unit has a factory-installed high-pressure safety switch in the high side refrigerant circuit. A
fusible plug kit is installed in each Liebert® DSE receiver.
NOTE: All indoor and outdoor field refrigerant piping must be insulated 1/2 in. minimum. All outdoor
insulation must be UV and ozone resistant.
•
Refer to
piping sizes based on equivalent pipe lengths.
•
Refer to
refrigerant-charge requirements of the system.
•
Refer to
5.2.2 Refrigerant Line Sizes and Equivalent Lengths
Table 5.4 Recommended Refrigerant Line Sizes, OD Copper
Model
Equivalent
Hot Gas
Length
Line, in.
50 ft (15 m)
1-1/8
100 ft (30 m)
1-1/8
150 ft (45 m)
1-1/8
300 ft (91 m)
1-1/8
450 ft (137 m)*
1-1/8
*Consult factory when actual pipe length between condenser/EconoPhase and Liebert DSE unit will exceed 300 ft (91 m).
Source: DPN000788. Rev. 11
36
3
/min (0.5-1.5 l/s) inside the pipe during brazing is sufficient to
Refrigerant Line Sizes and Equivalent Lengths
Refrigerant Charge Requirements for Air-cooled Systems
Charging Air-cooled Systems
DA050
DA080 and DA085
Liquid
Hot Gas
Line, in.
Line, in.
7/8
1-1/8
7/8
1-1/8
7/8
1-1/8
7/8
1-1/8
7/8
1-1/8
Compressor Oil
on page 70).
below, for recommended refrigerant
on page 41, for charging information.
DA125
Liquid
Hot Gas
Liquid
Line, in.
Line, in.
Line, in.
7/8
1-3/8
7/8
1-3/8
7/8
1-3/8
7/8
1-3/8
7/8
1-3/8
on the facing page, for the
DA150 and DA165
Hot Gas
Liquid
Line, in.
Line, in.
7/8
1-3/8
7/8
7/8
1-3/8
1-1/8
7/8
1-3/8
1-1/8
7/8
1-3/8
1-1/8
7/8
1-3/8
1-1/8
Vertiv | Liebert® DSE™ Installer/User Guide
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