Data Aire gForce DX - Glycol Systems; Glycol Concentration; Internal (Fluid) Volume - up and Downflow Evaporators; Brazed-Plate Condensers

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6.0 GLYCOL SYSTEMS
Glycol Concentration
The system must be filled with water and the appropriate amount of glycol (either ethylene or
propylene) 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
fluid cooler volume, the evaporator unit volume and the volume of the inter-connecting 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.
Internal (Fluid) Volume – Up and Downflow Evaporators
Evaporator Model
Standard Unit Volume In
Gallons (Liters)
Energy Saver Unit Volume In
Gallons (Liters)
GTGD 021
4.0 (15.1)
8.2 (31.0)
GTGD 028
4.5 (17.0)
8.7 (32.9)
GTGD 035
5.0 (18.9)
9.2 (34.8)
GTGD 046
5.5 (20.8)
9.7 (36.7)
GTGD 056
7.5 (28.4)
15.9 (60.2)
GTGD 070
8.0 (30.3)
16.8 (63.6)
GTGD 091
10.0 (37.9)
16.3 (61.7)
GTGD 106
12.0 (45.4)
23.1 (87.4)
Brazed-Plate Condensers
Data Aire water cooled units use brazed-plate condensers as a standard. Brazed-plate
condensers are constructed of plates brazed together to form an assembly of separate
channels. Refrigerant is confined to the space between the welded plates and is exposed to
gaskets only at the ports. Such condensers have a higher range of capacity.
The stainless-steel plates are configured with a wave pattern, which results in high turbulence
and low susceptibility to fouling. Because of the compact design, these condensers require a
low refrigerant charge. The construction of brazed units does not allow mechanical cleaning,
and internal leaks usually cannot be repaired. Thus, it is recommended to use closed-loop
cooling systems with good filtration or separators to keep the water clean.
NOTICE: Data Aire does not have experience of in-depth knowledge in the
field of water treatment and therefore only provides the following information
as a general reference. To properly maintain your water system, please
consult a water treatment expert.
Water Treatment
If impurities are not controlled, they can cause sludge or biological fouling. Simple blowdown
(discharging a small portion of the recirculating water to a drain) may be adequate to control
scale and corrosion on sites with good-quality makeup water, but it does not control biological