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Glossary
Daikin RoCon HP
Daikin Control
008.1420844 – 05/2014
Operating instructions
47
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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 Altherma EHS(X/H) to generate heat.
Backup heater
Optional electric ancillary heater for general support of the Daikin Altherma EHS(X/H) during heat gen-
eration.
Circulation pump
An optional electrical circulation pump which permanently recirculates 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 Control consists of many electronic components. The component 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.
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
Part of the hydraulic circuit which 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 temperatures.
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.).
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 Control-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.
Switching time programme
Programme for setting dates and times on the Control to define regular heating, cooling, economy and
hot water cycles.
Water shortage/ overheating
protection
Safety device which switches off the heat generator automatically if there is a water shortage, in order
to avoid over-heating.
Weather-controlled flow tem-
perature regulation
The inflow target temperature for temperature control in the heating unit is calculated from the
measured value for the external temperature and a defined heating curve.
