Wells RW-16 thru RW-36 Manuel d'installation télécharger pdf (Page 12)

RW SERIES INSTALLATION MANUAL

General

Reversible chiller systems may be successfully applied in a wide

range of commercial and industrial applications. It is the responsibility

of the system designer and installing contractor to ensure that

acceptable water quality is present and that all applicable codes have

been met in these installations.

WaterTreatment

Do not use untreated or improperly treated water. Equipment damage

may occur. The use of improperly treated or untreated water in this

equipment may result in scaling, erosion, corrosion, algae or slime.

The services of a qualified water treatment specialist should be

engaged to determine what treatment, if any, is required. The product

warranty specifically excludes liability for corrosion, erosion or

deterioration of equipment.

The heat exchangers in the units are 316 stainless steel plates with

copper brazing. The water piping in the heat exchanger is steel.

There may be other materials in the building’s piping system that

the designer may need to take into consideration when deciding the

parameters of the water quality.

If an antifreeze or water treatment solution is to be used, the designer

should confirm it does not have a detrimental effect on the materials in

the system.

ContaminatedWater

In applications where the water quality cannot be held to prescribed

limits, the use of a secondary or intermediate heat exchanger is

recommended to separate the unit from the contaminated water.

Material Copper 90/10 Cupro-Nickel 316 Stainless Steel

pH Acidity/Alkalinity 7- 9 7 - 9 7 - 9

Scaling Calcium and Magnesium Carbonate (Total Hardness) less than 350 ppm (Total Hardness) less than 350 ppm (Total Hardness) less than 350 ppm

Hydrogen Sulfide

Less than .5 ppm (rotten egg smell

appears at 0.5 PPM)

10 - 50 ppm Less than 1 ppm

Sulfates Less than 125 ppm Less than 125 ppm Less than 200 ppm

Chlorine Less than .5 ppm Less than .5 ppm Less than .5 ppm

Chlorides Less than 20 ppm Less than125 ppm Less than 300 ppm

Carbon Dioxide Less than 50 ppm 10 - 50 ppm 10- 50 ppm

Ammonia Less than 2 ppm Less than 2 ppm Less than 20 ppm

Ammonia Chloride Less than .5 ppm Less than .5 ppm Less than .5 ppm

Ammonia Nitrate Less than .5 ppm Less than .5 ppm Less than .5 ppm

Ammonia Hydroxide Less than .5 ppm Less than .5 ppm Less than .5 ppm

Ammonia Sulfate Less than .5 ppm Less than .5 ppm Less than .5 ppm

Total Dissolved Solids (TDS) Less than 1000 ppm 1000-1500 ppm 1000-1500 ppm

LSI Index

+0.5 to -.05 +0.5 to -.05

Iron, Fe

+ (Ferrous)

Bacterial Iron Potential

< .2 ppm < .2 ppm < .2 ppm

Iron Oxide

Less than 1 ppm. Above this level

deposition will occur.

Less than 1 ppm. Above this level

deposition will occur.

Less than 1 ppm. Above this level

deposition will occur.

Suspended Solids

Less than 10 ppm and filtered for max of

600 micron size

Less than 10 ppm and filtered for max of

600 micron size

Less than 10 ppm and filtered for max of

600 micron size

Threshold Velocity (Fresh Water) < 6 ft/sec < 6 ft/sec < 6 ft/sec

Grains = PPM divided by 17 • mg/l is equivalent to PPM

2/8/08

Corrosion

Erosion

Iron Fouling

(Biological Growth)

+0.5 to -.05

Water Quality

The following table outlines the water quality guidelines for unit heat

exchangers. If these conditions are exceeded, a secondary heat

exchanger is required. Failure to supply a secondary heat exchanger

where needed will result in a warranty exclusion for primary heat

exchanger corrosion or failure.

Strainers

These units must have properly sized strainers upstream of both

brazed plate heat exchangers to protect them against particles in the

fluid. Failure to install proper stainers and perform regular service

can result in serious damage to the unit, and cause degraded

performance, reduced operating life and failed compressors. Improper

installation of the unit (which includes not having proper strainers to

protect the heat exchangers) can also result in voiding the warranty.

Field supplied strainers with 20-40 mesh (530-1060 microns) are

recommended, with 30 mesh (800 microns) being the optimum

choice. The strainers selected should have a mesh open area of at

least 6 square inches (39 square centimeters) for each unit being

serviced by the strainer. Using strainers with a smaller amount of

open area will result in the need for more frequent cleaning.

Strainers should be selected on the basis of acceptable pressure

drop, and not on pipe diameter. The strainers selected should have a

pressure drop at the nominal flow rate of the units low enough to be

within the pumping capacity of the pump being used.

WARNING:Musthaveintermediateheatexchanger

whenusedinpoolapplications.

WaterQualityGuidelines

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 39 40

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Wells RW-16 thru RW-36 Manuel d'installation Page 12

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Produits connexes et manuels pour Réchauffeurs de nourriture Wells RW-16 thru RW-36