Reach-In
P/N 3053328_C 2-15
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
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.
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.
Water flow data is provided in the MDS case data
sheets, including required flowrate, pressure drop, and
heat of rejection.
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.