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P/N 0520677_W
Hussmann recommends using
DOWFROST™ inhibited propylene glycol.
Pre-diluted solutions (35% inhibited propylene
glycol) of DOWFROST™ are available from
Dow. The ingredients 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 adequate
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.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
Automatic Balancing Valves
Case may be equipped with automatic balancing
valves. The case will maintain the correct flow
rate. The cooling system pressure must be
between 5 to 30 psid for proper operation of the
automatic balancing valves.
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
deionized water for system flushing with 2%
TSP. Dry nitrogen can be used for the initial
pressure test, (60 to 75 psi), hold for three
hours.
Use only distilled or de-ionized water for flushing
with 2 percent TSP. Use a pre-mixed inhibited
glycol solution. If the mixing is to be done on site, use
only distilled or de-ionized water. Do not use tap
water.
Freedom Line Reach-in
2-13
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