Manual code 75803707A.0708
Page 41 of 64
7.3.2 CHILLED WATER AIR CONDITIONER
7.3.3 SIMULTANEOUS HUMIDIFICATION AND COOLING
Cooling the air increases its relative humidity until it reaches saturation point. It is clear that the air’s capacity to
absorb vapour depends on its relative humidity and falls to zero near saturation point. Attempting to humidify air in these
conditions, i.e. immediately after cooling, causes the vapour to condense and the consequent formation of puddles of
water inside the machine, as well as significant energy wastage.
For this reason, series C units are equipped with devices to interrupt humidification during operation, according
to the type of microprocessor control installed:
• µAC:
Direct Expansion Unit: Humidification is inhibited electro-mechanically.
Chilled Water unit: Humidification is permitted.
• pCO:
All units: Humidification is inhibited by way of the User parameter (default setting).
Should it be necessary to humidify the air at the same time as cooling it, so as to obtain, for example, a humidity
of over 50%, then we recommend installing an external room humidifier.
7.3.4 DEHUMIDIFICATION LOCK
In cases where a post-heating coil (accessory) is not installed, problems of low temperature supply air may
occur during dehumidification. In this case, a software lock intervenes to prevent a significant drop in room temperature.
If the air conditioner is dehumidifying and the temperature exceeds 150% of the proportional band, the
microprocessor will inhibit dehumidification, thereby giving priority to temperature control. Dehumidification may restart, if
still required, when the temperature reaches 50% of the proportional band.
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