HWM-407CH-IOM (09/13)
Page 12
Propylene-glycol antifreeze solution with an inhibitor is the type of antifreeze solution
required for Earthlinked
®
products utilized in radiant panel hydronic heating and/or chilled
water cooling systems. These systems shall be freeze protected consistent with the
application-specific minimum temperature as shown in the table below. Propylene-glycol
antifreeze solutions should always be in the range of 20% to 50% by volume, as indicated in
the Figure 7.
TEMPERATURE, °F
PROPYLENE GLYCOL, %
WATER SOLUTION
MULTIPLIER FACTOR (WSMF)
18
20
x 1.03
8
30
x 1.07
-7
40
x 1.11
-29
50
x 1.16
Figure 7. Propylene Glycol Freeze Protection Table
Propylene-glycol can be purchased in the straight form and mixed with an inhibitor prior to
filling the system, or it can be purchased as inhibited propylene-glycol. The following are
examples of manufacturers for the above:
Straight propylene-glycol: Chemical Specialties, Inc. (
www.chemicalspec.com/spg.html
)
Inhibitor: Nu-Calgon Products, Ty-lon B20 (
www.nucalgon.com/products
)
Inhibited propylene-glycol: Houghton Chemical Corp., SAFE-T-THERM
®
,
www.houghton.com/fluids/safe-t-therm/index.html
)
General guidelines for introducing propylene glycol into the water circulating system follow.
The manufacturer’s specific instructions and industry standards always take precedence
when introducing propylene-glycol to the system.
•
Calculate the quantity of inhibited propylene-glycol (fluid) required to achieve the
desired results.
•
Introduce a sufficient quantity of water to the system and pressure check to
ensure a sealed system.
