Sol-Reliant OG 300-2004008A, Installation, Operation And Maintenance Manual

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tanks, yet the temperature entering the building is never above that of the tempering valve
setting.
Heat Transfer Fluid
The Sol-Reliant system uses a Class II heat exchange fluid produced by Dowfrost
TM
HD, a non-
toxic propylene glycol antifreeze, in combination with distilled water, in the solar loop plumbing
as a heat transfer fluid. The fluid is dyed bright yellow to aid in leak detection. A 50% glycol
solution is adequate to protect from freezing down to -20 degrees F.
Dowfrost
TM
HD - Propylene Glycol Fluid - Freeze protection mixing chart
Freezing % Glycol
Temperature, °F by Volume
Freeze tolerance limits are based on an assumed
26 10 set of environmental conditions
19 20
8 30
-7 40 For more information, see MSDS Data Sheets
-28 50
-60 60
<-60 70
Technical data for operating fluid
The service temperature range for Dowfrost
TM
HD is -50 to 325 degrees F. At full strength it has a freezing point of
-100 degrees F. The boiling point is 325 degrees F. Mixed with water, Dowfrost
TM
HD has no flash point. In pure
concentration the flashpoint is 214 degrees F. Specific Heat: In a 50% glycol/water solution, at –20 degrees F the
specific heat is .756; at zero degrees, .764; at 30, .766; at 50, .80; at 70, .812; at 90, .824; at 110, .836; at 130, .845;
at 150, .860; at 170, .872; at 190, .864. In 50% or greater glycol solutions, the vapor pressure below 100 degrees F is
zero. It rises to 1.1 psia-English units at 110 degrees F, 1.5 @ 120; 1.9 @ 130; 2.5 @ 140; 3.2 @ 150; 14.6 @ 200;
and 25.6 @ 250. Viscosity in a 50% solution @ -10 degrees F is 95.97; at zero degrees, 61.32; at 10 degrees, 40.62;
at 30, 19.66; at 50, 10.65; at 70, 6.34; at 90, 4.05; at 110, 2.79; at 130, 2.02; at 150, 1.53; at 170, 1.20; at 190, .97; at
210, .81, and at 230, .69.
Instructions for inspection, treatment and disposal of fluid
An easy and reliable way to read your pH level is to use narrow range pH paper such as
pHydrion Control paper with a 7.2 to 8l8 ph range. It should be between 8 and 10. Any fluid
below the pH of 7 should be replaced.
You can quickly determine the condition of your fluid by examining its appearance and odor.
Any drastic variation from the initial fluid specifications, such as a black or dark-gray color,
presence of an oily layer, burnt odor, or any heavy sludge indicates the need for replacement.
Dowfrost
TM
HD is non-toxic and biodegradable. It may be handled without special equipment.
Small spills may be soaked up with common absorbent material. Clean up with water. More
information can be found on the Dow website (www.dow.com) or by calling 1-800-447-4369.