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Figure 13a. Parallel Piping with Common Liquid Header above
Receiver Level Alternative 1
Refrigerant Piping for Multiple Units
See Figures 13a and 13b for the refrigerant piping connections for multiple units:
• All valves and piping shown to be field provided and installed if necessary.
• These piping diagrams show the arrangement of multiple TrilliumSeries™ Adiabatic
Condensers. Additional piping requirements may be necessary for your system such as
backflow valves or equalizing lines.
• Weld/braze the pipes with care to prevent damage to the coil and unit.
• When piping the refrigerant connections, take care not to block the door opening of the
access hatch or control panel. See Figure 14.
• It is desirable to trap the liquid header as shown in Figure 13a. Trapping the header
will insure a stable operating condition for the condensers. If the liquid header is not
trapped, there will be times, particularly at initial start-up, where there will be erratic
condenser operation until all liquid leg seals are stabilized. Piping must be sized for
100 fpm drain velocities, and should be sloped a minimum of 1/4” per foot toward the
receiver.
• Figure 13b indicates an alternative method of trapping the main liquid header using
a vertical trap. The volume of the vertical trap between the bottom inlet connection
and the top outlet connection must be equal to the combined volume of the liquid in
all of the drop legs. The top of the vertical trap must be connected to the equalizing
line to prevent a siphoning effect from the liquid header to the receiver. There is no
need to trap the individual drip legs when a vertical trap is used. The drop legs and the
common liquid header should be sized for a maximum liquid velocity of 100 fpm.
Figure 13b. Parallel Piping with Common Liquid Header above
Receiver Level Alternative 2
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