Vertiv Liebert XD Series, System Design Manual

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Figure 6.18 Dimensions and knockout sizes, 36-inch models
6.14.3 Extra-Low Voltage Control Wiring
Control interlock between the control enclosure and the indoor unit(s) or other source(s) is required.
Multiple indoor units may be connected in parallel if the controlled pumps will feed them all.
• Extra-low voltage, non-safety control wiring must be a minimum of 16 GA. (1.665 mm2) for up to
75 feet (22.9m), or not to exceed 1V drop in the control line.
• Install extra-low voltage control wiring (24V) from Terminals 70 & 71 on the wire raceway in the
compressor compartment of the indoor unit to Terminals 70 & 71 of the control enclosure.
• Extra-low voltage control wiring should also be installed between Terminals 24 and 50 from the
control enclosure to the indoor cooling unit’s common alarm or other alarm location for loss-of-
flow indication.
• Install extra-low voltage control wiring between the auxiliary terminals on the control panel to
Terminals 70 and 71 on the drycooler.
• The flow switch wiring should be connected to Terminals 77 and 74.
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