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NOTICE
Risk of improper power-supply connection. Can cause equipment damage and loss of warranty coverage.
Prior to connecting any equipment to a main or alternate power source (for example: back-up generator
systems) for start-up, commissioning, testing, or normal operation, ensure that these sources are correctly
adjusted to the nameplate voltage and frequency of all equipment to be connected. In general, power-source
voltages should be stabilized and regulated to within ±10% of the load nameplate nominal voltage. Also, ensure
that no three-phase sources are single-phased at any time.
See transformer label for primary tap connections. Installer will need to change transformer primary taps if
applied unit voltage is other than pre-wired tap voltage.
NOTICE
Risk of improper electrical connection of three-phase input power. Can cause backward compressor rotation
and unit damage. Service technicians should use a gauge set on the system during the initial start up to verify
that the three-phase power is connected properly. Three-phase power must be connected to the unit line
voltage terminals in the proper sequence so that the compressors rotate in the proper direction. Incoming
power must be properly phased to prevent compressors from running backward. We recommend checking the
unit's phasing with proper instrumentation to ensure that power connections were made correctly. We also
recommend verifying discharge and suction pressures during start up to ensure that the compressors are
running in the correct direction.
NOTE: Use water-tight fittings for all electrical connections. Failure to do so risks damage to the outdoor unit.
The unit requires two separate power-supply connections:
•
A 3-phase, 460V power supply to the DSE™ Packaged Solution unit electrical enclosure or ATS.
•
A separate 120V power feed to the utility box (for light switches and convenience outlet).
•
An optional, separate 120V power feed from a field-supplied UPS to the DSE™ Packaged Solution-unit low-
voltage controls, which are located in the main electrical panel.
The electrical connections are described in the submittal documents included in the
Low voltage connections are detailed in
•
Figure 5.1 on the facing page
•
Figure 5.2 on page 24
•
Figure 5.3 on page 25
•
Figure 5.4 on page 26
•
Figure 5.5 on page 27
The following table lists the relevant documents by number and title.
Table 5.1 Electrical Field Connection Drawings
Document Number
DPN004960
DPN005099
DPN005051
22
Title
Electrical Connections
Service Door Access 400/500 kW Perimeter Unit
Service Door Access 400/500 kW Draw Through Rooftop Unit
Submittal Drawings
on page 65.
Vertiv | DSE Packaged Solution Installer/User Guide
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