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MTEC.DXi.H/DXi.HF.GB-3 Use and Maintenance technical manual DXi.H/DXi.HF English
Emibyte DXi.H/DXi.HF
Direct expansion close control
In DXi.HF units, use of glycol is always recommended.
If the anti-freeze mixture contains a lower ethylene glycol percentage than above recommended, there could be risks of
freezing, while a higher percentage can reduce the unit performance.
At the beginning of every winter, it is recommended to check the correct concentration of glycol in the system; please only
use inhibited ethylene glycol in order to avoid rusting of the hydraulic circuit.
Do not use anti-freeze liquids unsuited to copper, stainless steel and to all other materials present in the system.
The water system pressure must range between 1,5 and 3,5 bar.
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to avoid corrosion problems, limestone deposit and algae microrganism proliferation.
It is also possible to use water from water city systems adequately treated.
In these cases, the water condenser is equipped with a pressostatic valve as optional (VP or VCP accessories): when calculating the circu-
lation pump size, the pressure drop of this component must be also kept into account.
On demand, the condensers can be sized to be able to employ a water and ethylene glycol mixture in a closed circuit cooled by a forced
ventilation coil exchanger (dry-cooler) which dispels the heat into the atmosphere. The use of glycoled water allows the cooling circuit to
also work at low outdoor temperatures. The percentage of ethylene glycol to be used is indicated in tje following table.
When employing this mixture, the condenser must be equipped with a temperature control device of the anti-freeze mixture.
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It is also advisable to install a ball check valve on the condenser inlet and outlet so that it is possible to shut off the conditioning unit in
case of special maintenance operations: the installation of a three-piece joint between the valves and the conditioning unit will ease these
operations.
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