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6.0 GLYCOL SYSTEMS
6.1 Glycol Concentration
The system must be fi lled with water and the appropriate amount of ethylene or propylene glycol to
protect against winter freeze-up. To achieve the approximate glycol concentration, it is necessary
to know the total system volume. This consists of the sum of the fl uid cooler volume, the evaporator
unit volume, and the volume of the interconnecting piping.
The following tables can be used for arriving at an approximate system volume. After installation,
the glycol percentage should be checked. The glycol percentage should also be checked at regular
intervals to ensure freeze protection.
6.2 Internal (Fluid) Volume
Evaporator Without With
Internal Volume Energy Saver Coil Energy Saver Coil
Model Volume, Gallons Volume, Gallons
DAMG 0112 0.5 2.0
DAMG 1.512 0.5 2.0
DAMG 0212 0.8 2.5
DAMG 2.512 0.8 2.5
6.3 Fluid Cooler Internal Volume
Fluid Cooler Internal Fluid Cooler Internal
Model Volume, Gallons Model Volume, Gallons
DAFC 06 2.5 DAFC 17 6.6
DAFC 07 3.4 DAFC 21 7.4
DAFC 09 4.2 DAFC 24 9.8
DAFC 11 3.3 DAFC 28 12.3
DAFC 15 4.9
6.4 Copper Piping Internal Volume
Pipe Diameter, Volume per 100 Feet
inches of Pipe, Gallons
5/8 1.2
3/4 1.8
7/8 2.5
1-1/8 2.5
1-5/8 4.3
2-1/8 9.2
6.5 Freezing Point of Aqueous Solutions
Ethylene Glycol, Freezing Point Propylene Glycol, Freezing Point
% by Volume Degrees F. % by Volume Degrees F.
0 32 0 32
10 24 10 27
20 15 20 18
30 4 30 8
40 -13 40 -6
50 -33 50 -26
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