Connection For Water Cooled Units - Trane MERCURY EDAB 1105A Technical Manual

Connection for water cooled units

WARNING! The laying of the lines and hydraulic
connections must only be carried out by a
qualified plumber.
WARNING! The chilled water must contain a
percentage of ethylene glycol (of the passive
type, which is therefore not corrosive) according
to the minimal external temperature predicted
(see the table below).
Percentage of ethylene glycol
Freezing temperature
If the temperature of the chilled water is not checked it
may fall to under 25°C, therefore it is necessary to use
a pressostatic valve (available as an optional) for each
condenser; in this case the pressure of the supply must not
be less then 200 kPa (2 bar).
WARNING! Do not use chilled water with an
evaporating tower because the condensers will
quickly become encrusted with limescale.
The condenser must be connected to the chilled water
distribution network, paying attention to the direction of the
water inlet and outlet.
The condensers are supplied by water pumped in a closed
circuit and chilled by external refrigerators; check that the
section of piping and the characteristics of the circulation
pump are suitable: an insufficient flow of water can have a
negative effect on the capacity of the conditioner.
The chilled water temperature must be checked to ensure
that it does not fall to below 25°C, preferably according to
the plan indicated in the figure.
The microprocessor control system is predisposed for
measuring the temperature of the water using probes (A)
and modulating the servomotor of the valve (B) or by driving
the fans (C) of the external refrigerators.
PKG-SVX19B-E4
10% 20% 30% 40%
-4°C -10°C -17°C -25°C -37°C
If the water temperature falls to below the dew point of the
air conditioner, isolate the piping with closed cell material
(e.g.: Armaflex or equivalent) to avoid condensation; the
isolation must allow the accessibility of the valves and the
three piece joints. Seal the piping holes through the base of
the conditioner to avoid a bypass of air.
WARNING! The water cooled pressure must not
be above 6 bar.
Table of condenser fitting dimensions
50%
Water
condenser inlet
Water
condenser
outlet
Once the connections have been made to the hydraulic
circuit, the system can be filled.
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