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2-22
Hussmann recommends using DOWFROST™
inhibited propylene glycol. Pre-diluted solutions
(35% inhibited propylene glycol) of DOW-
FROST™ are available from Dow. The ingre-
dients in DOWFROST™ have been
approved by the FDA and are listed as
chemically acceptable by USDA.
The Dow Chemical Company
Midland, MI 48674
1-800-447-4369
www.dow.com
Requirements on system fluid:
Pre-mixed 35% inhibited propylene glycol
Typical Fluid Properties
Solution Composition is 35% inhibited
propylene glycol by weight
pH of Solution 8.0 – 10.0
Specific Gravity (at 60°F) 1.033
Viscosity (at 20°F) 14.2 cP
Boiling Point of Solution 217°F
Freezing Point of Solution 2°F
Refractive Index (at 72°F) 1.3733
System Balancing
Balancing may be required to provide ade-
quate coolant flow to each circuit in order to
maintain the required waterflow. Balancing is
achieved through the setting of balance valves
located throughout the system piping.
The installation contractor must consult and
be familiar with the manufacturer's Material
Safety Data Sheets (MSDS) before handling
any secondary fluid. The MSDS contains
proper disposal and safety methods.
P/N 3074287_H
PRE-INSTALLATION SYSTEM CLEANING
Dow recommends the new piping system be
cleaned using a 1-2% solution of trisodium
phosphate (TSP), or equivalent cleaner and
distilled or deionized water to remove grease,
mill scale, or other residues from construction.
Repeat this process if necessary until the
drained solution is clear and free from visible
debris. The system should then be drained and
flushed again using distilled or deionized water.
Hussmann only recommends distilled or de-
ionized water for system flushing with 2% TSP.
Dry nitrogen can be used for the initial pres-
sure test, (60 to 75 psi), hold for three hours.
Use only distilled or de-ionized water
for flushing with 2 percent tri-sodium
phosphate (TSP). Use a pre-mixed
inhibited propylene/glycol solution. If
the mixing is to be done on site, use only
distilled or de-ionized water. Do not use
tap water.
U.S. & Canada 1-800-922-1919 • Mexico 01-800-890-2900 • www.hussmann.com
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