Technical Terms - Bosch Compress 3000 AW Operating Instructions Manual

Technical terms

Heat pump
The central heat source. Installed in the open air. Alternative
designation: outdoor unit. Contains the cooling circuit. Heated or cooled
water is routed from the heat pump to the indoor unit.
Indoor unit
Installed in the building and distributes the heat from the heat pump to
the heating system and DHW cylinder. Contains the user interface and
primary pump to the outside to the heat pump.
Heating system
Designation for entire installation, comprising the heat pump, indoor
unit, DHW cylinder, heating system and accessories.
Heating system
Comprises heat source, container, radiators, underfloor heating system
or fan radiators or a combination of these elements if the heating system
is made up of several heating circuits.
Heating circuit
The part of the heating system that distributes the heat throughout the
various rooms. Consists of pipework, pump and radiators, heating hoses
of the underfloor heating system or fan convectors. Only one of the
specified alternatives is possible within a circuit. However, if for
example the heating system is equipped with two circuits, radiators can
be installed in one and an underfloor heating system installed in the
other. Heating circuits can be configured with and without mixers.
Heating circuit without mixer
In a heating circuit without a mixer the temperature in the circuit is
controlled purely by the energy from the heat source.
Heating circuit with mixer
In a heating circuit with mixer, the mixer mixes return water from the
circuit with hot water from the heat source. This allows heating circuits
with mixers to be operated at lower temperatures than the other heating
system, e.g. so that underfloor heating systems that operate at lower
temperatures can be separated from radiators that require higher
temperatures.
Mixing device
The mixer is a valve that mixes colder return water with hot water from
the heat source in order to achieve a specific temperature. The mixer can
be in a heating circuit or in the indoor unit for the external auxiliary
heater.
3-way valve
The 3-way valve distributes thermal energy to the heating circuits or the
DHW cylinder. It has two defined settings so that heating and DHW
heating cannot take place at the same time. This is also the most
effective operating mode as the DHW is always heated to a specific
temperature whereas the heating water temperature is continuously
adapted to the outside temperature in each case.
External auxiliary heater in dual-fuel mode
The external auxiliary heater is a separate heat source which is
connected via pipework to the indoor unit. The heat produced in the
auxiliary heater is controlled via a mixer. It is therefore also referred to as
an auxiliary heater with mixer or boiler. The user interface controls the
connection and shutdown of the auxiliary heater according to the
existing heat energy demand. Heat sources are electric, oil-fired or gas-
fired boilers.
Primary circuit
The part of the heating system that transports the heat from the heat
pump to the indoor unit.
Compress 3000 AW
CLIMATE CONTROL SYSTEMS
Cooling circuit
The main part of the heat pump that recovers energy from the outdoor
air and transfers this as heat to the primary circuit. Consists of
evaporator, compressor, condenser and expansion valve. The
refrigerant circulates in the cooling circuit.
Evaporator
Heat exchanger between air and refrigerant. The energy from the air that
is drawn in through the evaporator causes the refrigerant to boil and turn
to gas.
Comp
Moves the refrigerant through the cooling circuit from the evaporator to
the condenser. Increases the pressure of the gaseous refrigerant. The
temperature also increases as the pressure increases.
Condenser
Heat exchanger between refrigerant in cooling circuit and water in the
heat transfer medium circuit. During the heat transfer, the temperature
of the refrigerant falls as it transfers to the liquid aggregation state.
Expansion Valve
Reduces the pressure of the refrigerant after it is discharged from the
condenser. The refrigerant is then routed back to the evaporator where
the process starts again.
Transformer
Located in the heat pump and allows the speed of the compressor to be
controlled based on the heat energy demand.
Setback phase
A time slot during automatic mode, with Setback operating mode.
Automatic mode
The heating system is heating in accordance with the time program and
an automatic changeover takes place between operating modes.
Mode
The operating modes for heating are: Heating and Setback. They are
depicted by the symbols
Operating modes for DHW heating are:DHW, DHW reduced and Off.
An adjustable temperature is assigned to each operating mode (except
for Off).
Frost protection
Depending on the selected frost protection, the heat pump will turn on
when the outside and/or room temperature reaches below a certain set
threshold. Frost protection prevents the heating system from freezing
up.
Required room temperature (also desired or set temperature/set
room temp.)
The room temperature to be achieved by the heating system. It can be
set individually.
Default setting
Values permanently saved in the programming unit (e.g. complete time
programs) that are available at any time and that can be reinstated
according to demand.
Heating phase
A time slot during automatic mode, with Heating operating mode.
Child lock
Settings in the standard display and in the menu can only be changed if
the child lock (key lock) is switched off ( page 7).
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Technical terms | 13
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6 720 818 009 (2015/07)