Conair VL Series Water Quality Control, Inhibited Propylene Glycol, Choosing the Proper Glycol

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8.3WATER QUALITY CONTROL

A.Lack of, as well as, improper water treatment can damage the chilling unit. The services of a competent water treatment specialist should be obtained and their recommendations followed. It is the equipment owner’s responsibility to prevent damage from foreign material or inadequate water treatment.

B.The two main things to consider for water treatment in chillers are corrosion and organism growth. Proper chemical treatment can control PH levels and algae growth. An alternative to chemical treatment is the addition of 20% inhibited propylene glycol to the water. This will help prevent organism growth and coat the heat transfer surfaces with corrosion inhibitor.

8.4INHIBITED PROPYLENE GLYCOL

A.The use of a water-glycol mixture is needed when the operator desires a process temperature below 48°F. Freeze protection is required so ice crystals do not form and cause severe damage to both the water and refrigeration system.

B.CHOOSING THE PROPER GLYCOL:

FREEZING POINTS FOR

WATER/PROPYLENE GLYCOL SOLUTIONS

 

PERCENTAGE OF

FREEZE POINT

 

GLYCOL* WATER

˚F

˚C

 

 

0

100

32

0

 

 

10

90

25

-3.9

 

 

20

80

10

-12.2

 

 

30

70

0

-17.8

 

 

40

60

-10

-23.3

 

 

50

50

-30

-34.4

 

 

60

40

-60

-51.4

 

*PROPLYLENE GLYCOL

NOTE: GLYCOL FREEZE POINT MUST BE 25˚F BELOW LOWEST SETPOINT

1.For getting the most efficiency from your system, a propylene glycol such as “DowFrost” is a must. DowFrost contains special corrosion inhibitors for low system maintenance and better transfer capabilities than normal glycols. It also has a much longer fluid life up, to 20 years in some cases.

2.SOURCES OF INHIBITED PROPYLENE GLYCOLS: for a complete literature package, material, safety data sheets and purchasing information, contact the following:

DOW CHEMICAL 1-800-447-4369 (Canada 1-800-363-6250) Dowfrost inhibited propylene glycol

MONSANTO CHEMICAL 1-800-459-2665 Monsanto FS inhibited propylene glycol

UGH020/0301

VL Series Portable Chillers, 0.25 to 1.5 Tons

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Contents Portable Chillers Date Manual Number UGH020/0301 Serial numbers Model numbers Installation Table of Contents GeneralTroubleshooting MaintenanceVL Series Portable Chillers, 0.25 to 1.5 Tons UGH020/0301 General Clean AIR ACT SafetyUnit Location EfficiencyMiscellaneous VL Series Portable Chillers, 0.25 to 1.5 Tons UGH020/0301 Installation To and from Process Connections AIR Cooled Condenser Drain ConnectionElectrical Connection Nema 1 Models Control Circuit WiringOperations Start UP/OPERATIONS Procedure System Fill Instrument Operation General Description OperationsFront Keypad Description of Parameters Parameters Defaults Shut DOWN/DISCONNECT Sequence PRECAUTIONS/WARNINGS Error AnnunciationTroubleshooting Unit Shuts Down on LOW Pressure Switch Unit Shuts Down on High Pressure SwitchUnit will not Start Pump will not StartPage VL Series Portable Chillers, 0.25 to 1.5 Tons UGH020/0301 Maintenance Periodic Preventative Maintenance Warranty Service ProcedurePump Repair Special MaintenanceVL Series Portable Chillers, 0.25 to 1.5 Tons UGH020/0301 Components Refrigeration System Water SystemRelated Drawings Pump Electrical Drawing TypicalCircuit Schematic Item Description This page Intentionally Blank Appendix VL Air-cooled Portable Chillers 0.25 to 1.5 tons SpecificationsFreeze Protection Operation below 48FWater Supply Precautions Safety AdjustmentsInhibited Propylene Glycol Water Quality ControlChoosing the Proper Glycol USE of Plain Glycol Maintenance ResponsibilityAutomotive Based Antifreeze Capacity Chiller Capacity and Derate ChartFreon Pressure PRESSURE-TEMPERATURE Chart for R-22 RefrigerantUseful Engineering Formulas Parts List Description Call Equipment Guarantee Performance Warranty
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VL Series specifications

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