Conair 0.25 to 1.5 ton, VL Series manual Freezing Points For, Water/Propylene Glycol Solutions

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 Page: 37