Glycol Systems; Glycol Concentration; Internal (Fluid) Volume; Fluid Cooler Internal Volume - Data Aire DAPA-2.5 Installation, Operation & Maintenance Manual

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 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.

Internal (Fluid) Volume

Evaporator Model
DAPA-2.5XX
DAPA-03XX
DAPA-04XX
DAPA-05XX

Fluid Cooler Internal Volume

Fluid coolers have individual Installation, Operation and Maintenance Manuals which should be referred
to for more complete details regarding remote heat exchangers.

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.

Table 23 Mini-DAP Ceiling Unit Internal (Fluid) Volume

Standard Unit Volume
Gallons (Liters)
NOTICE: Data Aire does not have experience of indepth 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.
Energy Saver Unit Volume
1.0 (3.8)
1.0 (3.8)
2.5 (9.5)
2.5 (9.5)
62
Gallons (Liters)
2.5 (9.5)
2.5 (9.5)
4.0 (15.1)
4.0 (15.1)