Cli-mate CLI-AP30 Specifications download pdf (Page 100)

Appendix 12 (DOWFROST Specifications)

DOW FROST

HEAT TRANSFER FLUID

MANUFACTURER

The Dow Chemical Company

Thermal Fluids Business

100 Larkin Center

Midland, Michigan 48674

Phone: 1-800-447-4369

GENERAL PRODUCT DESCRIPTION

DOWFROST

industrially inhibited propylene

glycol-based heat transfer fluid is manufactured by

The Dow Chemical Company. Aqueous solutions of

DOWFROST fluid are designed to provide

freeze/burst and corrosion protection, as well as

efficient heat transfer, in water-based, closed-loop

heating and air-conditioning systems.

DOWFROST fluid has an operating temperature range

of -50°F to 250°F; with fluid freeze protection to below

-60°F, and system burst protection to below -100°F.

The fluid contains corrosion inhibitors that are

specially formulated for HVAC systems to keep pipes

free of corrosion without fouling. DOWFROST fluid is

low in toxicity. Fluid ingredients are generally

recognized as safe (GRAS) by the FDA. DOWFROST

fluid can be specified for use in new HVAC systems, or

as a replacement fluid for use in existing systems

where incidental contact with food or drinking water is

likely. The fluid is colorless (water white).

Since the toxicity of heat transfer fluids may be

adversely altered in HVAC systems, used fluids should

be handled with reasonable care, and not be taken

internally.

HVAC SYSTEM FLUID SPECIFICATION

Closed-loop, water-based systems

1. FLUID MATERIAL

The propylene glycol fluid to be used in such a

system must meet the following requirements:

1.1 The fluid must be industrially inhibited

propylene glycol (phosphate-based).

1.2 The fluid must be easily analyzed for glycol

concentration and inhibitor level, and easily

reinhibited using inhibitors readily available

from the fluid manufacturer.

1.3 If the system contains more than 250 gallons of

fluid, annual analysis must be provided free of

charge by the fluid manufacturer. Manufacturer

must also provide testing guidelines for use by

the operator of a smaller system.

1.4 The fluid must pass ASTM D1384 (less than 0.5

mils penetration per year for all system metals).

2. FLUID INSTALLATION

Follow these installation procedures:

2.1 Clean new or lightly corroded existing systems

with a 1% to 2% solution of trisodium

phosphate in water prior to the installation of

industrially inhibited propylene glycol fluid.

2.2 Extensively corroded existing systems should

be cleaned by an industrial cleaning company

and all necessary replacements and repairs

should be made.

2.3 Use only good quality water in solution with

the propylene glycol fluid. Use water with low

levels (less than 25 ppm) of chloride and

sulfate,

and less than 50 ppm of hard water ions

(Ca

, Mg

). Distilled or deionized water is

recommended.

If good quality water is

unavailable, purchase pre-diluted solutions of

industrially inhibited propylene glycol fluid

from the fluid manufacturer or, if available,

from the distributor.

3. SYSTEM DESIGN CONSIDERATIONS

3.1 Avoid use of automatic water make-up systems

to prevent undetected dilution of the propylene

glycol and possible contamination of the water

system.

*Trademark of The Dow Chemical Company

Engineering Specifications for Closed-Loop HVAC and Refrigeration Systems

Where Incidental Contact with Food or Drinking Water is Possible

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