Technical Specifications

Heat Rejection
119
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 clean-
ing 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 clean-
ers 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 46. Use Table 52 for field-installed piping volumes. Indoor unit volumes are found in their
user manuals.
6.13.2 Glycol Solutions
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.
When mishandled, glycol products pose a threat to the environment. Before using any glycol
products, review the latest Material Safety Data Sheets and ensure that you can use the
product safely. Glycol manufacturers request that the customer read, understand and comply
with the information on the product packaging and in the current Material Safety Data
Sheets. Make this information available to anyone responsible for operation, maintenance
and repair of the drycooler and related equipment.
No chemical should be used as or in a food, drug, medical device, or cosmetic, or in a product or
process in which it may contact a food, drug, medical device, or cosmetic until the user has
determined the suitability and legality of the use. Since government regulations and use conditions
are subject to change, it is the user's responsibility to determine that this information is appropriate
and suitable under current, applicable laws and regulations.
NOTICE
Risk of using the wrong type of glycol. Can cause piping damage, coolant fluid leaks, and
substantial building damage.
Automotive antifreeze is unacceptable and must NOT be used.
Typical inhibited formula ethylene glycol and propylene glycol manufacturers and suppliers are
Union Carbide (Ucartherm) and Dow Chemical (Dowtherm SR-1, Dowfrost). These glycols are
supplied with corrosion inhibitors and do not contain a silicone anti-leak formula. Commercial
ethylene glycol and propylene glycol, when pure, are generally less corrosive to the common metals of
construction than water itself. Aqueous solutions of these glycols, however, assume the corrosivity of
the water from which they are prepared and may become increasingly corrosive with use when not
properly inhibited.
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.