Manual Dimplex LA 25TU (page 17 of 60) (English, German, French)

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www.dimplex.de 452163.66.10 · FD 9506 EN-3

English

LA 17TU - LA 40TU

1.4 Energy-efficient use of the heat

pump

By operating this heat pump, you are helping to protect the envi-

ronment. A prerequisite for energy-efficient operation is the cor-

rect design of the heat source system and heating system.

It is particularly important for the efficiency of a heat pump to

keep the temperature difference between heating water and heat

source as small as possible. For this reason, it is advisable to de-

sign the heat source and heating system very carefully. A tem-

perature difference of approx. one Kelvin (one °C) increases

the power consumption by around 2.5 %. When designing the

heating system, it should be borne in mind that special consu-

mers such as e.g. domestic hot water preparation should also be

taken into consideration and dimensioned for low temperatures.

Underfloor heating systems (panel heating) are optimally sui-

ted for heat pump use on account of the low flow temperatures

(30 °C to 40 °C).

It is important to ensure that the heat exchangers are not conta-

minated during operation because this increases the tempera-

ture difference, in turn reducing the COP.

Correct adjustment of the heat pump manager is also important

for energy-efficient use of the heat pump. Further information can

be found in the operating instructions of the heat pump manager.

2 Purpose of the heat

pump

2.1 Application

The air-to-water heat pump is to be used exclusively for the hea-

ting of heating water. It can be used in new or already-existing

heating systems.

The heat pump is suitable for mono-energy and bivalent opera-

tion down to an external temperature of -25 °C.

Proper defrosting of the evaporator is guaranteed by maintaining

a heating water return temperature of more than 18 °C during

continuous operation.

The heat pump is not designed for the increased heat consump-

tion required when a building is being dried out. For this reason,

the additional heat consumption should be met using special de-

vices provided by the customer. If a building is to be dried out in

autumn or winter, we recommend installing an additional electric

heating element (available as an accessory).

NOTE

The device is not suitable for operation with a frequency converter.

2.2 Operating principle

Surrounding air is drawn in by the fan and fed through the evapo-

rator (heat exchanger). The evaporator cools the air, i.e. it ex-

tracts heat from it. This extracted heat is then transferred to the

working medium (refrigerant) in the evaporator.

The heat is brought to a higher temperature level by increasing

its pressure with the aid of the electrically driven compressor. It is

then transferred to the heating water via the liquefier (heat ex-

changer).

Electrical energy is used to raise the temperature of the heat in

the environment to a higher level. As the energy extracted from

the air is transferred to the heating water, this type of device is

called an air-to-water heat pump.

The air-to-water heat pump consists of the main components:

evaporator, ventilator and expansion valve, as well as the low-

noise compressors, the liquefier and the electrical control sys-

tem.

At low ambient temperatures, humidity accumulates on the eva-

porator in the form of frost, reducing the transfer of heat. Uneven

accumulation during this process does not indicate a fault. The

evaporator is defrosted automatically by the heat pump as re-

quired. Steam may be emitted from the air outlet depending on

the atmospheric conditions.

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Dimplex LA 25TU Manual

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