Mechanical Considerations
11
4.4
System Connection Configuration
If possible, connect the XDO modules to XDPs or XDCs in an interlaced configuration (see
). Interlacing the connection piping will keep half the XDP/XDC units operating and main-
tain even cooling in the conditioned space should one of the XDP or XDC units fail.
However, in a system with just one XDP or XDC, connect XDO modules in a non-interlaced configura-
).
Figure 10 Typical XDO piping—interlaced connections
Figure 11 Typical XDO piping—non-interlaced connection
Return A
XDP/XDC A
Supply A
Return B
XDP/XDC B
Supply B
XDO A
XDO B
XDO A
XDO B
XDO B
XDO A
XDO B
XDO A
TOP VIEW—NOT TO SCALE
NOTE: Line size does NOT indicate pipe size difference.
Return
XDP/XDC
Supply
XDO A
XDO A
XDO A
XDO A
TOP VIEW—NOT TO SCALE
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