PRINCIPIO DI FUNZIONAMENTO DEUMIDIFICATORI DR

DEHUMIDIFIERS DR OPERATING PRINCIPLE

PROFESSIONAL DEHUMIDIFIERS

Diagnostica grafica interattiva

Interactive graphic diagnostic

Maniglia estensibile

Extensible handle

Filtro

Filter

Vaschetta di raccolta acqua (no DR100)

Water collection train (no DR100)

Presa umidostato esterna (DR70 - DR100)

Externalhumidistat switch (DR 70 - DR100)

Ruote in gomma antimacchia

Stain-resistant rubber wheels

Fig. 2

The Biemmedue dehumidifiers

are stand-alone equipment, which

do not require any installation,

apart from plugging into the

mains. The dehumidifier consists

of a closed circuit containing an

environmentally friendly refrigerant.

The main elements are:

compressor (n°2 - Fig. 1): this

determines the circulation of the

refrigerant,

condenser (n°3 - Fig. 1): in this

part, which is physically similar to

a car radiator, the gaseous state

fluid, driven by the compressor is

transformed into liquid and releases

its heat; the heat generated heats

the condenser itself,

coiled tube (n°5 - Fig. 1): in

this element the fluid, which

has become liquid, expands and

reduces its own pressure,

evaporator (n°6 - Fig. 1): in this

element, which too consists of a

group similar to a car radiator, the

liquid is transformed into gas by

subtracting heat and consequently

cooling the evaporator.

The refrigerant which has returned

to the gaseous state continues its

route through the compressor and

the cycle starts again.

The air for dehumidification is

drawn through the dehumidifier by

a fan (n°1 - Fig. 1) crossing first

the evaporator (cold) and then the

condenser (hot).

The working cycle is thus the

following:

The air passes on the surface

of the evaporator, where it cools

depositing the excess moisture,

which is transformed into drops of

water that fall into the tank.

Then, the air passes through the

condenser, where it regains several

degrees in temperature and is

recycled into the environment as a

drier warmer air, thus contributing,

in the mix that is determined over

time, to lower the moisture level

of the premises, until the desired

values are reached.

When the room temperature is

under certain values (15°/18°C),

the temperature of the surfaces

of the evaporator drops in turn

thus causing the formation of ice

which limits the passage of air,

and compromising the correct

functioning of the system.

To avoid this possible problem, with

the exception of model DR80, there

is an automatic defrost function,

which consists of the possibility of

heating the evaporator when the

sensor records temperatures which

are too low.

In this case through a by-pass

valve (n°4), the compressor

sends the gas directly into the

evaporator, without passing from

the condenser, thus determining

an increase in temperature.

The by-pass circuit closes

automatically when the sensor

reveals a higher temperature and

the dehumidification cycle returns

to normal. It should be pointed

out that the defrosting system

guarantees that the dehumidifier

returns to perfect efficiency after

a few seconds; moreover, it is the

only defrosting system that allows

the full efficiency of the dehumidifier

even with very low air temperatures

(under 8/10 °C).

13