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LA 33TBS
1.3 Legal regulations and
guidelines
This heat pump is designed for use in a domestic environment
according to Article 1, Paragraph 2 k) of EU directive 2006/42/EU
(machinery directive) and is thus subject to the requirements of
EU directive 2014/35/EU (low-voltage directive). It is thus also in-
tended for use by non-professionals for heating shops, offices
and other similar working environments, agricultural establish-
ments and hotels, guesthouses and other residential buildings.
The construction and design of the heat pump complies with all
relevant EU directives, DIN/VDE regulations (see CE declaration
of conformity).
When connecting the heat pump to the power supply, the rele-
vant VDE, EN and IEC standards are to be adhered to. Any fur-
ther connection requirements stipulated by local utility compa-
nies must also be observed. It is prohibited to remain in the direct
vicinity of the device during storms (risk of lightning)!
When connecting the heating system, all applicable regulations
must also be adhered to.
This unit can be used by children aged 8 and over and by per-
sons with limited physical, sensory or mental aptitude or lack of
experience and/or knowledge, providing they are supervised or
have been instructed in the safe use of the unit and understand
the associated potential dangers.
Children must not play with the device. Cleaning and user main-
tenance must not be carried out by children without supervision.
ATTENTION!
Work on the heat pump must only be performed by authorised and
qualified after-sales service technicians!
ATTENTION!
When operating or maintaining a heat pump, the legal requirements of the
country where the heat pump is operated apply. Depending on the
refrigerant fill quantity, the heat pump must be inspected for leaks at
regular intervals by a certified technician, and these inspections must be
recorded.
More information can be found in the accompanying log book.
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 approximately one Kelvin (1 °C) in-
creases the power consumption by around 2.5 %. When
designing the heating system, it should be borne in mind that
special consumers such as domestic hot water preparation
should also be taken into consideration 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, as this increases the temperature
difference, which in turn reduces the COP.
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When set correctly, the heat pump manager is also an essential
factor in the energy-efficient use of the heat pump. Further infor-
mation can be found in the heat pump manager operating in-
structions.
2
Intended use of the heat
pump
2.1 Intended purpose
The air-to-water heat pump is to be used exclusively for the heat-
ing of heating water. It can be used in new or existing heating
systems.
The heat pump is suitable for mono-energy and bivalent opera-
tion down to an external temperature of -22 °C.
Proper defrosting of the evaporator must be guaranteed by main-
taining 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 evap-
orator (heat exchanger). The evaporator cools the air, i.e. ex-
tracts heat from it. This extracted heat is then transferred to a
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
from 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 referred to as an air-to-water heat pump.
The main components of an air-to-water heat pump are the evap-
orator, fan and expansion valve, as well as the low-noise com-
pressors, liquefier and the electrical control system.
At low ambient temperatures, humidity accumulates on the evap-
orator 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. Under certain atmospheric conditions, steam may be
emitted from the air outlet.
452166.66.05 · FD 9803
English
EN-3
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