Vertiv Liebert XD Series, System Design Manual

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Control Wire Run, m
(ft)
Drycooler Types With Pump Controls
DSF DDF DSO DDO
Number of Fans
1 1 1 2 3 4 6 8 1 2 3 4 6 8
7.9-15.2 (26-50) 1.0 1.0 1.0 1.0 1.0 1.0 1.0 2.5
15.5-22.8 (51-75) 1.0 1.0 1.0 1.0 1.0 1.5 1.5 4.0
23.2-30.4 (76-100) 1.0 1.0 1.0 1.0 1.0 1.5 2.5 4.0
30.8-38.1 (101-125) 1.0 1.5 1.0 1.5 1.5 2.5 2.5 6.0
38.4-45.7 (126-150) 1.0 1.5 1.0 1.5 1.5 2.5 4.0 6.0
Table based on 1.0 mm2 min. wire size, 0.5 Amp per contactor, 1 to 1.5 Volt maximum drop & 40 °C (104 °F) average ambient temperature
Table 6.18 Minimum recommended control circuit wire size, mm2, 50Hz models (continued)
6.13 Filling Instructions
6.13.1 Preparing the System for Filling
It is important to remove any dirt, oil or metal filings that may contaminate the cooling system piping in
order to prevent contamination of the fresh glycol solution and fouling of the drycooler piping. The
system should be flushed thoroughly using a mild cleaning solution or high-quality water and then
completely drained before charging with glycol. Cleaning new systems is just as important as cleaning old
ones. New systems can be coated with oil or a protective film; dirt and scale are also common. Any residual
contaminants could adversely affect the heat transfer stability and performance of your system. In many
cases, in both old and new systems, special cleaners are needed to remove scale, rust and hydrocarbon
foulants from pipes, manifolds and passages. Clean heat transfer surfaces are important in maintaining
the integrity of the heating/cooling system. For more information on cleaners and degreasers, contact
your sales representative. Follow the manufacturer’s instructions when using these products.
Calculate the internal volume of the system as closely as possible. The drycooler volumes are shown in
Table 6.14 on page 140. Use Table 6.20 on page 147 for field-installed piping volumes. Indoor unit
volumes are found in their user manuals.
6.13.2 Glycol Solutions
NOTE: Glycol solutions should be considered for the protection of the coil. When glycol solutions are
not used, damage can occur either from freezing or from corrosion from water.
When considering the use of any glycol products in a particular application, you should review the latest
Material Safety Data Sheets and ensure that the use you intend can be accomplished safely. For Material
Safety Data Sheets and other product safety information, contact the supplier nearest you. Before
handling any other products mentioned in the text, you should obtain available product safety
information and take necessary steps to ensure safety of use.
NOTICE
Risk of mishandled glycol products. Can cause environmental damage.
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