CAUTION: Risk of excessive refrigerant line pressure. Can cause tubing and component rupture resulting in
equipment damage and personal injury. Do not close off the refrigerant-line isolation valve for repairs unless
a pressure relief valve is field installed in the line between the isolation valve and the check valve. The
pressure relief valve must be rated 5% to 10% higher than the system design pressure. An increase in
ambient temperature can cause the pressure of the isolated refrigerant to rise and exceed the system design
pressure rating (marked on the unit nameplate).
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: backup generator
systems) for startup, 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.
NOTICE
Risk of oil contamination with water. Can cause equipment damage.
Liebert® DSE systems require the use of POE (polyolester) oil. POE oil absorbs water at a much faster rate
when exposed to air than previously used oils. Because water is the enemy of a reliable refrigeration system,
extreme care must be used when opening systems during installation or service. If water is absorbed into the
POE oil, it will not be easily removed and will not be removed through the normal evacuation process. If the oil
is too wet, it may require an oil change. POE oils also have a property that makes them act as a solvent in a
refrigeration system. Maintaining system cleanliness is extremely important because the oil will tend to bring
any foreign matter back to the compressor.
NOTICE
Risk of improper refrigerant charging. Can cause equipment damage.
Refrigerant charge must be weighed into air cooled compressorized systems before they are started. Starting
digital scroll compressors without proper refrigerant charging can cause the compressors to operate at less
than 5°F (–15°C) evaporator temperature and at less than 52 psig (358 kPa). Operation for extended periods at
less than 52 psig (358 kPa) can cause premature compressor failure.
Vertiv | Liebert® DSE Thermal Management System Installer/User Guide
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Содержание Liebert DA250
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