EarthLinked SCWD-024-1C, Quick Start Instructions

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SCWD-QS (12/16) Page 25
7) Antifreeze Protection
When SCWD Compressor Units are applied to radiant panel hydronic heating and/or 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 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 )
General guidelines for introducing propylene glycol into the water circulating system :
IMPORTANT!
FAILURE OF THE INSTALLER TO PROVIDE ADEQUATE ANTIFREEZE
SOLUTION PROTECTION IN EARTHLINKED
®
RADIANT PANEL
HYDRONIC HEATING AND/OR COOLING SYSTEMS AT THE TIME OF
SYSTEM START-UP WILL VOID THE EARTHLINKED
®
LIMITED
WARRANTY FOR HEATING AND COOLING SYSTEMS.
IMPORTANT!
Because addition of propylene-glycol to water changes the specific heat
of water, the required flow rate of propylene-glycol solution (for the
same heat transfer as water) must be increased by the water solution
multiplier factor shown in the table above.
WARNING!
ALWAYS REMOVE THE ANODE ROD(S) FROM THE STORAGE WATER
TANK OR HEATER UTILIZED IN A RADIANT PANEL HYDRONIC
HEATING AND/OR COOLING SYSTEM. IF THE ANODE ROD(S) ARE NOT
REMOVED, THE PROPYLENE-GLYCOL SOLUTION WILL REACT WITH
THE ANODE ROD(S) TO CREATE PARTICLES THAT BLOCK FLOW AND
CAUSE SYSTEM FAILURE.