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Designing a Liebert XD Solution
29
3.18 Chilled Water Piping
The Liebert XDP is offered only with a two-way chilled water control valve. Some applications may
require the use of a pressure activated bypass valve, to prevent dead-heading of the chilled water
pump. This bypass valve must be specified by the engineer responsible for design of the chilled water
field piping system.
Chilled water connections to the Liebert XDP are near the bottom of the unit. Refer to the Liebert
XDP user manual (SL-16641) for further information. Piping is routed downward from the unit to
chilled water piping under the raised floor. Connections are made using standard practices for copper
chilled water piping. Victaulic
®
connections may be used to simplify installation in existing facilities.
Refer to Table 31 for additional information.
3.19 Electrical
Make all wiring and electrical connections in accordance with local and national codes. Refer to the
applicable table in 5.0 - Specifications regarding wire size and circuit protection requirements.
Refer to electrical schematic when making connections.
3.20 Display Panel and Remote Temperature/Humidity Sensor Locations
The display panel must always be installed in the conditioned space. The display panel may be
mounted on the Liebert XDC/XDP’s front door if the unit is located in the area that it conditions.
The remote temperature / humidity sensor for the Liebert XDP and the Liebert XDC should be located
in the higher-temperature portion of the cold aisle where the XD modules are located. Alternatively, it
can be placed on the return air side of the primary air mover (e.g., Liebert Deluxe System/3
™
) in the
room if it represents the conditions where all the XD cooling modules are located. It should not be
installed where ambient air might cause false readings, for example, near unsealed doors, windows
and similar areas.
Table 14 Outdoor condenser charge—R-407c
Model Charge / Circuit, lb (kg)
CDL830 200 (90.8)
CSL616 254 (115.2)
CSL415 200 (90.8)
Table 15 Air cooled systems - liquid line charge - R-407c refrigerant per 100 ft (30 m) of Type "L"
copper tube
O.D.,
inches
Liquid Line,
lb (kg)
Hot Gas Line,
lb (kg)
3/8 3.7 (1.7) -
1/2 6.9 (3.1) -
5/8 11.0 (5.0 2.2 (1.0)
3/4 15.7 (7.1) 3.1 (1.4)
7/8 23.0 (10.4) 17.5 (8.0)
1-1/8 39.3 (17.8) 7.8 (3.5)
1-3/8 59.8 (27.1 11.8 (5.4)
1-5/8 - 16.7 (7.6)
Table 16 Indoor water/glycol cooled module – R-407c refrigerant charge
Model 60 Hz Charge / Circuit, lb(kg)
Liebert XDC 160 30.0 (13.2) per circuit