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IOM, VS/VT Models, Rev A Enertech Global
Antifreeze Charging
Calculate the total amount of pipe in the system
and use Pipe Fluid Volume Table below to
calculate the amount of volume for each specic
section of the system. Add the entire volume
together, and multiply that volume by the proper
antifreeze percentage needed from the Antifreeze
Percentages by Volume Table below for the freeze
protection required in your area. Then, double
check calculations during installation with the
proper hydrometer and specic gravity chart to
determine if the correct amount of antifreeze was
added.
Pipe Fluid Volume
Antifreeze Percentages by Volume
Type of Antifreeze
Minimum Temperature for Freeze Protection
10°F (-12.2°C) 15°F (-9.4°C) 20°F (-6.7°C) 25°F (-3.9°C)
ProCool (Ethanol) 26% 23% 18% 13%
Methanol 21% 17% 13% 5%
Propylene Glycol* 30% 25% 20% 13%
Heat Transfer Fluid (HTF) Mix according to manufacturer’s directions on container label
Antifreeze solutions are shown in pure form - not premixed
HTF is a premixed Methanol solution
*Concentrations below 25-30% (consult manufacturer) typically require additional inhibitors.
Type Size
Volume Per 100ft
US Gallons
Type Size
Volume Per 100ft
US Gallons
Copper 1” CTS 4.1 HDPE .75” SDR11 3.0
Copper 1.25” CTS 6.4 HDPE 1” SDR11 4.7
Copper 1.5” CTS 9.2 HDPE 1.25” SDR11 7.5
HDPE 1.5” SDR11 9.8
HDPE 2” SDR11 15.4
Additional component volumes:
Unit coaxial heat exchanger = 1 Gallon
Flush Cart = 8-10 Gallons
10’ of 1” Rubber Hose = 0.4 Gallons
Section 5: Unit Piping Installation
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