Vertiv Liebert DSE500, Installer/User Manual

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DP500 PERIMETER & ROOF TOP UNIT
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ELECTRICAL FIELD CONNECTIONS
LIEBERT DSE
OPTIONAL ELECTRICAL CONNECTIONS
13)
UPS Option
- 120V entrance (Separate feed from utility panel) – Located in bottom left side of main panel.
14) Supply Air Aggregator Sensor – Is a control option that allows the use of the 1 NTC sensor that is
already provided as a standard with the unit and the ability to ADD up to an additional 5 - 2T sensors to be
used together to measure the supply temperature for a total of up to 6 supply sensors. The ability to use
multiple sensors to measure the supply temperature provides iCOM™ the ability to control using the
Maximum or Average of all the supply sensors. This is especially useful in application of ducted systems
and non-raised floor application because of the ability to have additional sensors strategically placed to
measure supply temperature and they provide benefits in raised floor applications.
15) 2T Sensor – Is a control option that allows temperature data from multiple sensors to be averaged
together when used in Team Work 1 Mode. In this mode, one unit is selected as the “master”. When
cascade control is enabled, selected unit or units will operate continuously, standby unit will cycle on when
additional cooling is required. If Lead/Lag control is enabled, Standby unit will automatically start upon
detection of a Lead unit. The Lead unit will automatically rotate every 24 hours (Adj) to ensure equal run
time between all units if auto rotate is enabled.
OPTIONAL LOW VOLTAGE TERMINAL PACKAGE CONNECTIONS
16) Remote unit shutdown - Two additional contact pairs available for unit shutdown (labeled as 37B & 38B,
37C & 38C). Replace jumpers with field supplied normally closed switch having a minimum 75VA, 24VAC
rating. Use field supplied Class 1 wiring.
17) Common alarm - On any alarm, two additional normally open dry contacts are closed across terminals 94 &
95 and 96 & 97 for remote indication. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring.
ACCEPTABLE POWER SUPPLIES FOR 480V NOMINAL UNITS:
i. 480V wye with solidly grounded neutral and 277V line to ground;
ii. Wye with high resistance (or impedance) ground;
iii. Delta with corner ground
UNACCEPTABLE POWER SUPPLIES FOR UNITS:
iv. Delta without ground or with floating ground;
v. Delta with grounded center tap.
REV : 0
REV DATE : 4/18