EarthLinked SCW Series, Quick Start Instructions

Page: 13 / 30

SCW-410-QS (05/12) Page 13
Antifreeze Protection
When SCW compressor units are applied to radiant panel hydronic heating and/or chilled water
cooling systems, the water circulating system must be protected from potential damage due to
freeze-up by utilizing an adequate antifreeze solution. The antifreeze protection is provided by the
installer prior to the EarthLinked
®
system start-up.
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 table.
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
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 )