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English 05/09
ACCURATE AX - AW - AD - AT - AF
9
Version AT (water-cooled )
Condenser
Each unit is fitted with one (for single circuit units) or two (two
circuit units) condensers made from braze welded stainless steel
heat exchangers. In addition, the condensers are oversized in
order to limit pressure drop (and minimise the power input of
the circulating pumps).
The units generally work via closed circuits with dry coolers
cooled by the outside air. To prevent the formation of frost, the
fluid used inside the closed circuit should always contain a per-
centage of glycol, as indicated in this manual, based on the average
minimum temperature reached in the place of installation in the
coldest periods.
The cooling fluid must be circulated by pumps (not supplied as
standard). Suitably-sized dry coolers are available as options.
Water circuit
The unit is fitted with a 3-way modulating valve to control the
flow of cooling fluid to the indoor exchanger so as to maintain
the desired conditions.
In the DUAL FLUID units, the two circuits, direct expansion DX
and chilled water CW, never work at the same time. The direct
expansion circuit DX is used as backup to the chilled water cir-
cuit CW.
Activation set points for the two circuits are available and are
described in the User Terminal manual. Remember that circulation
pump is NOT selected, nor provided from Climaveneta.
AT - water cooled