Operating instructions
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Daikin Altherma EHS(X/H)
Daikin Altherma integrated solar unit
008.1420944 – 05/2014
9
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Glossary
9 Glossary
Ancillary heater
An additional heat generator (e.g. backup heater or external heating boiler) which is part of the heating
system and which helps bring the system up to the inflow target temperature in case of an insufficient
or ineffective heat pumping process.
Anti-legionella system
Periodic heating of storage water to >60°C for preventative elimination of pathogenic bacteria (le-
gionella) in the hot water circuit.
Backup demand
Operating situation in which the desired infeed temperature cannot be reached or cannot be achieved
efficiently through the heat pump process. As a result, an extra heater (e.g. backup heater) is used to
support the Daikin Wärmeerzeuger to generate heat.
Backup heater
Optional electric ancillary heater for general support of the Daikin Wärmeerzeuger during heat gener-
ation.
Circulation circuit
Is an optional ancillary circuit in the hot water circuit which serves to ensure that hot water flows out of
the discharge point as soon as the tap is turned on. In this circuit the hot water circulates via a circu-
lation pump between the hot water storage tank and the draw-off point.
Circulation pump
An optional electrical circulation pump which permanently re-circulates the hot water in the hot water
pipes (feed from the tap connection back to the domestic hot water storage tank) and thus provides it
at each draw-off point without delay. Circulation is particularly effective in widely branched piping net-
works. In hot water distribution systems without a circulation pipe, at first the water cooled in the outlet
pipe escapes during the tapping process until the outlet pipe is sufficiently heated by the hot water
flowing subsequently.
Control
Device electronics, with which the processes for heat generation and heat distribution for the heating
system are controlled. The Altherma EHS(X/H) consists of many electronic components. The com-
ponent that is most important to the operator is the operating element at the front of the heat generator
which has operating elements (rotary switch, rotary button and Exit key) and a display.
Direct circuit
The water circuit that is heated directly by the heat generator, without additional temperature regu-
lation.
Domestic hot water gener-
ation
Operating status of the heat generator, in which heat is generated at increased temperatures and sup-
plied to the hot water circuit, e.g. filling the hot water storage tank.
Flow pipe
Part of the hydraulic circuit that directs the heated water from heat generator to the heating surfaces.
Heat exchanger
A part that transfers thermal energy from one circuit to another. Both circuits are separated from each
other hydraulically by a wall in the heat exchanger.
Heat pumping process
In a closed coolant circuit, the coolant absorbs heat from the surrounding air. Compressing this coolant
results in a higher temperature which can then be transferred to the heating unit (thermodynamic
circuit).
Heating characteristic curve Mathematical relationship between the external temperature and the target flow temperature
(synonym = heating curve), in order to achieve the desired room temperature at all outside tempera-
tures.
Hot water circuit
Is the water circuit in which the cold water is heated and directed to the hot water discharge point.
Low tariff mains connection
(HT/NT)
A special mains connection to the energy supplier, which offers various cheaper rates during so-called
low-load periods for electrical current (day-, night-, heat pump current, etc.).
Mixing circuit
A heating circuit in which a heating temperature that deviates from that of the direct circuit is set by
means of the controlled mixing of the return flow of this heating circuit.
Modulation
Automatic and continuous adjustment of the thermal / pump output to the particular heat requirement,
without having to switch various heating / pumping stages or cycles.
Nominal output
Maximum heat output given by the heat generator at certain operating temperatures under test condi-
tions.
Operating mode
User or Altherma EHS(X/H)-demanded function of the heat generator (e.g. room heating, hot water
heating, stand-by, etc.).
Parameter
A value that influences the execution of programs or processes or defines specific states.
Refrigerant
A material which is used for thermal transfer in a heating system. At low temperature and low pressure,
heat is absorbed and at high temperature and a high pressure, heat is emitted.
Return flow
Part of the hydraulic circuit that directs the cooled water from the radiators in the rooms back to the
heat generator via the piping system.
SMART GRID (SG)
Intelligent energy utilisation for economical heating. Using a special electricity meter it is possible to
receive a "SMART GRID signal" from the energy supply company.
Depending on the signal from the energy supply company, the heat pump is turned off, put into
standard mode or run in high-temperature mode.
Storage tank charging circuit Is the water circuit which heats the water stored in the hot water storage tank (not to be confused with
the hot water circuit).
