Manual Dimplex LI 24TES (page 23 of 76) (English, German, French)

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www.gdts.one 452161.66.22 · FD 9912 EN-3

LI 20TES - LI 28TES English

1.4 Energy-Efficient Use of the Heat

Pump

With the purchase of this heat pump you are helping to protect

the environment. A prerequisite for energy-efficient operation

is the correct design of the heat source system and heating sys-

tem (radiators and circulation pump).

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 design the heat source and heating system very carefully. A

temperature difference of approx. one Kelvin increases the

power consumption by around 2.5 %. When designing the

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

sumers such as e.g. hot water preparation should also be con-

sidered and dimensioned for low temperatures. Underfloor

heating systems (panel heating) are optimally suited 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 con-

taminated during operation because this increases the temper-

ature difference, in turn reducing the COP.

Correct adjustment of the heat pump manager is also impor-

tant for energy-efficient use of the heat pump. Further informa-

tion can be found in the heat pump manager's operating in-

structions.

2 Purpose of the Heat Pump

2.1 Application

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

heating of heating water. It can be used in newly built or previ-

ously existing heating systems.

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

tion down to an external temperature of -20 °C.

Proper defrosting of the evaporator is guaranteed by maintain-

ing a heating water return flow temperature of more than 18 °C

during continuous operation.

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

sumption required when a building is being dried out. The addi-

tional heat consumption should be met using special devices

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

tumn or winter, we recommend installing an additional heating

element (available as an accessory).

NOTE

The device is not suitable for operation with a frequency

converter.

2.2 Operating Principle

Outside air is drawn in by the ventilator and fed via the evapora-

tor (heat exchanger). The evaporator cools the air, i.e. it extracts

heat from it. This extracted heat is then transferred to the work-

ing medium (refrigerant) in the evaporator.

The heat is “pumped” to a higher temperature level by in-

creasing its pressure with the aid of the electrically driven com-

pressors. It is then transferred to the heating water using the

liquifier (heat exchanger).

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

the environment to a higher level. Because the energy ex-

tracted 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, liquifier and electrical control system.

At low ambient temperatures, humidity accumulates on the

evaporator 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 required. Steam may be emitted from the air outlet de-

pending on the atmospheric conditions.

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Dimplex LI 24TES Manual

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