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Glycol/GLYCOOL-Cooled Models—Self-Contained Compressor
45 Liebert
®
Challenger 3000
™
5.4.1 Expansion Tanks, Fluid Relief Valves and Other Devices
An expansion tank must be provided for expansion and contraction of the fluid due to temperature
change in this closed system. Vents are required at system high points to vent trapped air when
filling the system. A relief valve is a also a necessary piping component.
Depending on the complexity of the system, various other devices may be specified. Pressure gauges,
flow switches, automatic air separator, tempering valves, standby pumps, sensors for electrical
controls, and flow switches are just a few of these devices.
NOTICE
Risk of frozen fluids. Can cause piping and system components to rupture and leak, resulting
in equipment and building damage.
Immediately following the use of water for leak testing or system cleaning, charge the system
with the proper percentage of glycol and water for your coldest design ambient. Complete
system drain-down cannot be assured.
5.5 Filling Instructions
5.5.1 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. See Table 14 and Table 16 for
unit volumes. Use volume in Table 15 for glycol piping volumes.
Table 14 Indoor unit glycol volume approximate gallons (liters) max.
Model (50 Hz) Glycol-Cooled GLYCOOL
046WG/(045WG) 1.2 (4.5) —
071WG/(070WG) 2.0 (7.5) —
061G/(058G) — 4.0 (15.1)
Table 15 Volume in standard Type “L” copper piping
Diameter (in.) Volume
Outside Inside Gal/Ft L/M
1/2 0.123 0.008 0.01
5/8 0.555 0.012 0.15
3/4 0.666 0.018 0.22
7/8 0.785 0.025 0.31
1-1/8 1.025 0.043 0.53