Bosch Compress 3400i AWS User manual

6721852787 (2023/01) GB/IE
Operation Manual
Air to Water Heat Pump
Compress 3400iAWS E
Heat Pump with Indoor Unit

Table of contents
Compress 3400iAWS E – 6721852787 (2023/01)
2
Table of contents
1 Explanation of symbols and safety instructions . . . . . . . . . . . 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Application area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Control unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Heat pump details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Type plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.4 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . 4
2.5 Heat pump (outdoor unit) . . . . . . . . . . . . . . . . . . . . . . . . 4
2.5.1 Generic overview of the refrigerant circuit . . . . . . . . . . . 5
2.6 Indoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.7 Hints on energy saving. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Control unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1 Operation after power failure . . . . . . . . . . . . . . . . . . . . . 6
3.1.2 Overview of control elements and symbols . . . . . . . . . . 6
3.2 Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.1 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.2 Selecting a heating circuit for the standard display . . . . . 8
3.2.3 Set operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2.4 Changing the room temperature temporarily. . . . . . . . . 8
3.2.5 Changing the room temperature permanently . . . . . . . . 8
3.2.6 Adapting the heating system settings using the
time program (automatic mode) . . . . . . . . . . . . . . . . . . . 9
3.2.7 Selecting active time program for the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.8 Renaming a time program or heating circuit. . . . . . . . . 10
3.2.9 DHW settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.10 Setting up a holiday program. . . . . . . . . . . . . . . . . . . . . 11
3.2.11 More settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 Main menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.1 Heating settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.2 DHW settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.3 Settings for the venting function . . . . . . . . . . . . . . . . . . 15
3.3.4 Setting up a holiday program. . . . . . . . . . . . . . . . . . . . . 16
3.3.5 General Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.3.6 Settings for other systems or devices. . . . . . . . . . . . . . 17
3.4 Calling up information about the system . . . . . . . . . . . 17
3.5 Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.6 Connect-Key K 30 RF . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Indoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.1 Checking the operating pressure . . . . . . . . . . . . . . . . . 19
4.1.2 Overheating protection . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.3 Particle filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.4 Moisture in cooling mode. . . . . . . . . . . . . . . . . . . . . . . . 20
4.1.5 Checking the safety valves. . . . . . . . . . . . . . . . . . . . . . . 20
4.2 Heat pump (outdoor unit) . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.1 Removing dirt and leaves. . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.2 Casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.3 Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.4 Snow and ice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 Tightness test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4 Information on refrigerant. . . . . . . . . . . . . . . . . . . . . . . 21
5 Environmental protection and disposal . . . . . . . . . . . . . . . . . 21
6 Data Protection Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7 Display of consumption values in relation to the
funding guidelines for federal funding for efficient
buildings - individual measures (BEG EM) . . . . . . . . . . . . . . . 22
8 Technical terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9 Overview Main menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
10 Overview Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Explanation of symbols and safety instructions
3
Compress 3400iAWS E – 6721852787 (2023/01)
1 Explanation of symbols and safety instructions
1.1 Explanation of symbols
Warnings
In warnings, signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if measures for
minimizing danger are not taken.
The following signal words are defined andcan be used in this document:
DANGER
DANGER indicates that severe or life-threatening personal injury will
occur.
WARNING
WARNING indicates that severe to life-threatening personal injury may
occur.
CAUTION
CAUTION indicates that minor to medium personal injury may occur.
NOTICE
NOTICE indicates that material damage may occur.
Important information
The info symbol indicates important information where there is no risk to
people or property.
Additional symbols
Table 1
Table 2
1.2 General safety instructions
1.2.1 Application area
The heat pump may only be used in sealed heating systems according to
EN 12828.
Other uses are not appropriate. Any damage that results from such use is
excluded from liability.
The heat pump must undergo maintenance according to EN1717 4.6.
HNotices for the target group
These operating instructions are intended for the heating system
operator.
All instructions must be observed. Failure to comply with instructions
may result in material damage and personal injury, including danger to
life.
▶ Read and retain the operating instructions (heat generator, heating
controller, etc.) prior to operation.
▶ Observe the safety instructions and warnings.
▶ Operate the heat generator only with the casing fitted and closed.
HSafety of electrical appliances for domestic use and similar
purposes
The following requirements apply in accordance with EN 60335-1 in
order to prevent hazards from occurring when using electrical
appliances:
”This appliance can be used by children of 8 years and older, as well as
by people with reduced physical, sensory or mental capabilities or
lacking in experience and knowledge, if they are supervised and have
been given instruction in the safe use of the appliance and understand
the resulting dangers. Children must not play with the appliance.
Cleaning and user maintenance must not be performed by children
without supervision.”
”If the power cable is damaged, it must be replaced by the manufacturer,
its customer service department or a similarly qualified person, so that
risks are avoided.”
HInspection and maintenance
Regular inspection and maintenance are prerequisites for safe and
energy efficient operation of the heating system.
We recommend you enter into a contract for the annual inspection and
demand-dependent maintenance with an authorised installer.
▶ Have work carried out only by an approved installer.
▶ If any faults are discovered, have them remedied immediately.
HInspection and maintenance
If there is a lack of cleaning, inspection or maintenance, or if these are
carried out incorrectly, this may result in material damage and/or
personal injury, including possible risk to life.
▶ Have work carried out only by an approved contractor.
▶ Do not take off the outdoor unit cover.
▶ Do not modify the heat pump or other parts of the heating system.
HRoom air
The air in the installationroom must be free of combustible or chemically
aggressive substances.
▶ Do not use or store combustible or explosive materials (paper,
propellants, thinners, paints, etc.) within the vicinity of the
appliance.
▶ Do not use or store corrosive substances (solvents, adhesives,
chlorinated cleaning agents, etc.) within the vicinity of the appliance.
Symbol Meaning
▶ a step in an action sequence
a reference to a related part in the document
• a list entry
–a list entry (second level)
Symbol Meaning
Warning of low burning velocity material. The
appliances CS3400iAWS 4-10 OR-S has R32
refrigerant which is a flammable refrigerant with low
burning velocity (A2L). If the refrigerant is leaked and
exposed to an external ignition source, there is a risk of
fire.
Warning of strong magnetic field.
Maintenance by a qualified person should be done
while following the instructions of the service manual.
For operation follow the instructions of the user
manual.

Product description
Compress 3400iAWS E – 6721852787 (2023/01)
4
HDamage caused by frost
The solar system can freeze if it is switched off:
▶ Observe the notices regarding frost protection.
▶ Due to the additional functions, e.g. DHW heating or pump anti-
seizure protection, the system should always be left on.
▶ Correct any faults immediately.
HRisk of scalding at the DHW draw-off points
▶ If DHW temperatures above 60 °C are set or if thermal disinfection is
activated, a mixer must be installed. If in doubt, ask your installer.
2 Product description
This is an original manual. This manual may not be translated without the
approval of the manufacturer.
The Compress 3400i AWS heat pump belongs to a series of heat pumps
that recover energy from the outdoor air for heating and domestic hot
water heating.
By reversing this process and removing heat from the heating water and
releasing it to the outdoor air, the heat pump can also be used for cooling
if necessary. To do this however, the heating system must be configured
for cooling mode.
In order to obtain a complete heating system, the CS3400iAWS outdoor
unit which is set up outdoors must be connected to an indoor unit in the
building. The indoor unit with integrated electric booster heater serves
as auxiliary heater when the heat energy demand is particularly high, e.g.
if the outside temperature is too low for the heat pump to operate
effectively.
The heating system is controlled by the HPC 410 control unit which is
located in the indoor unit. The control unit controls the system using a
range of different settings for the heating, cooling, domestic hot water
and other operations. The monitoring function switches the heat pump
off in the event that faults occur, for example, as this prevents the main
components from being damaged.
2.1 Control unit
The HPC 410 control unit in the indoor unit controls the heat production
based on the outdoor sensor values, possibly in combination with the
room temperature-dependent controller CR10H (accessory). The
temperature in the building is adapted automatically, based on the
outside temperature.
The user specifies the temperature of the heating system by setting the
required room temperature on the control unit or room temperature-
dependent controller.
Various accessories (e.g. swimming pool, solar and room temperature-
dependent controller) can be connected to the indoor unit via the EMS
plus bus. Additional functions and setting options therefore become
available and can also be controlled via the control unit. For more
information on accessories, refer to the relevant instructions.
2.2 Heat pump details
Following the installation and commissioning of the heat pump and
indoor unit, specific tasks must be performed at regular intervals. These
include checking whether alarms have been triggered and simple
maintenance work. These actions can normally be performed by the user
unassisted. However, if problems persist it may be necessary to contact
the system installer.
2.3 Type plate
The data plate of the outdoor unit is located on the rear side. At the
indoor unit, the data plate can be found on the side cover.
It contains information on the output, part number and serial number
and also the date of manufacture.
2.4 Declaration of Conformity
The design and operation of this product comply with
European Directives and the supplementary national
requirements. Conformity has been demonstrated by the CE
marking.
You can ask for a copy of the Declaration of Conformity for this product.
Please refer to the contact address on the back cover of these
instructions.
2.5 Heat pump (outdoor unit)
The heating system consist of two parts: the heat pump outdoor unit
CS3400iAWS that is installed outdoors and the indoor unit.
In a house with water based heating a difference is made between
heating water and domestic hot water (DHW). The heating water is for
radiators and floor coils and hot water is for showers and taps.
The outdoor unit switches off when it reaches a minimum outside
temperature. The indoor unit then take over the heating and DHW
heating.
ForCS3400iAWS 4-10 OR-S and CS3400iAWS 10-14 OR-Tthe outdoor
unit will switch off when the outdoor temperature is below –20 °C
(approximately) or exceeds 45 °C (approximately)
For CS3400iAWS 12-14 OR-Sthe outdoor unit will switch off when the
outdoor temperature is below –15 °C (approximately) or exceeds 45 °C
(approximately)
The outdoor unit has the task of recovering energy from the outdoor air
and transferring it to the indoor unit.
The outdoor unit varies the speed of the compressor automatically so
that precisely the required amount of energy is supplied in each
instance. The speed of the fan is also controlled and it regulates its speed
according to the requirements. This keeps the energy consumption as
low as possible.
Defrosting
Ice can form on the evaporator at low outside temperatures. If the layer
of ice becomes so thick that it impedes the flow of air through the
evaporator, an automatic de-icing process is initiated. As soon as all the
ice has melted, the heat pump reverts to normal mode.
At low outside temperatures, defrosting is achieved by reversing the flow
direction of the refrigerant in a circuit via a 4-way valve; this type of
defrosting is referred to as 'reverse circulation'.

Product description
5
Compress 3400iAWS E – 6721852787 (2023/01)
2.5.1 Generic overview of the refrigerant circuit
Fig. 1 Functional principle of the refrigerant circuit in the heat pump
[1] Evaporator
[2] Compressor
[3] Condenser
[4] Expansion valve
2.6 Indoor unit
The purpose of the indoor unit is to distribute the heat from the outdoor
unit to the heating system and DHW cylinder. The speed of the circulation
pump in the indoor unit is controlled so that it automatically reduces
when demand is low. The energy consumption falls as a result.
If the heat energy demand is higher at low outside temperatures, an
auxiliary heater may be required. Auxiliary heaters can be integrated or
external and are switched in or disconnected automatically by the user
interface in the indoor unit. If the outdoor unit is in operation, the electric
booster heater only produces enough heat to make up the shortfall
between the outdoor unit output and the required heat. As soon as the
outdoor unit is once again producing the required output on its own, the
auxiliary heater is switched off automatically.
AWS E
When the outdoor unit is combined with the indoor unit AWS E and DHW
is also to be produced via the heat pump, an external DHW cylinder must
be connected. The changeover between heating and DHW is then
effected by an external 3-way valve. The integrated electric booster
heater in the indoor unit is started if required.
Fig. 2 Heat pump outdoor unit, indoor unit AWS E with electric booster heater and external DHW cylinder
+27 °C
75 %
+35 °C+2 °C –2 °C
0 °C 88 °C
–4,5 °C 50 °C
25 % 100 %
12
4
3
0010036938-001

Operation
Compress 3400iAWS E – 6721852787 (2023/01)
6
2.7 Hints on energy saving
• Use the normal heating mode, thus the heating system will use the
least energy. Set the desired room temperature according to your
personal comfort needs.
• Open the thermostatic vents fully in all rooms. Increase the
temperature setting on the control only when the desired room
temperature has not been reached for some time. Close the
thermostatic valve ina specific room, only if that room is warmer then
the others.
• If there is a room controller installed, this can be used to set the
optimal room temperature. Avoid influence of external heating (i.e
sunlight or wood stove). Otherwise unwanted fluctuations in the
room temperature may occur.
• Avoid placing big objects e.g. a sofa in front of the radiators
(minimum 50 cm distance). This will block the circulation of the
heated air in the room.
• Do not set a too low temperature for cooling. Cooling will also
consume energy.
Vent the room correctly
Open the windows fully for a short period instead of leaving them ajar.
Leaving the windows ajar will let the heated air out of the room constantly
without increasing the air quality. Close the thermostatic valves or lower
the heating setting on the room controller while the room is vented.
3Operation
WARNING
Material damage from frost!
The heating or auxiliary heater may be irreparably damaged by frost.
▶ Do not start the indoor unit if there is a possibility of the heating or
auxiliary heater being frozen.
3.1 Control unit
The user interface HPC 410 controls max. 4 heating circuits individually
in one of the respective control modes:
•Outdoor-temp.-compensated
– the flow temperature is adjusted based on the outside
temperature according to an optimised heating curve.
•Outdoor-temp.-compensated with low end1)
– the flow temperature is adjusted based on the outside
temperature according to a simplified heating curve.
For both of the control modes a room controller may be installed in the
reference room to allow the influence of the measured and required
room temperature. The heating curve is then adjusted accordingly.
The user interface HPC 410 is installed in the appliance and cannot be
used as room controller. Ask your contractor for available room
controllers.
Rule of thumb for outdoor-temp-compensated control with influence of
room temperature: the thermostatic valves in the reference room (the
room in which the remote control is installed) must be fully open!
The cooling function is not available in Belgium or Denmark.
The cooling menu items mentioned in this manual may be hidden if the
installed system is not suitable for cooling.
The electric booster or additional heater are not available for normal
operation in Denmark. The heater is however allowed to run in fault
mode, for extra DHW and thermal disinfection.
Depending on the software version of the user interface, the texts shown
in the display may differ from the texts in these instructions.
The adjustment ranges, default settings and functional scope may differ
from the information in these instructions, depending on the system
installed at the site.
• If 2 or more heating circuits are installed, settings for different
heating circuits are available and are necessary.
• If special system components and modules are installed (e.g.
MS 200solar module, pool module MP 100), corresponding settings
are available and necessary.
• If certain types of heat source are installed, additional settings may
be available and necessary.
3.1.1 Operation after power failure
At electric power failure or periods with disconnected heat source, no
settings are lost. The control unit will restart when the power is restored.
It is possible that time and date may need to be reset. No other settings
are needed.
3.1.2 Overview of control elements and symbols
Fig. 3 Control elements
[1] fav key: calls up the favourites menu
[2] extra DHW key: starts extra DHW charging
[3] DHW key: set the operating mode for DHW heating
[4] menu key: main menu (press briefly)
[5] info key: info menu or further information about the current
selection
[6] dkey: returns to previous menu or discards a value (press
briefly); returns to the standard display (hold down)
[7] Selector: select (turn) and confirm (press)
1) This setting is not available in Finland or Sweden
0010032819-001
fav
menu
info
5
6
7
4
2
3
1

Operation
7
Compress 3400iAWS E – 6721852787 (2023/01)
If the display lighting is off, only the lighting goes on when the selector is
pressed for the first time. When the selector is turned and another
control element is pressed at the same time, the lighting is switched on
in addition to the effect described. The descriptions of the steps to be
carried out by the operator in these instructions always assume that the
lighting is activated. If no control element is actuated, the lighting turns
off automatically (after approx. 30 s with the standard display, after
approx. 30 min in the menu, after 24 h in the event of a fault).
Fig. 4 Symbols in the standard display (example display)
The standard display refers only to the displayed heating circuit.
Changing the required room temperature in the standard display only
affects the heating circuit displayed.
Table 3 Symbols in the display
3.2 Control panel
An overview of the structure of the main menu and the position of the
individual menu items can be found at the end of this document.
An overview of the items that can be found in the info menu is also found
at the end of this document.The info menu is useful to get instant
information of the status of the heat pump.
Each of the following descriptions takes the standard display as its
starting point (Fig. 4).
Item Symbol Explanation
1Value display (current temperature):
• Room temperature if a remote control is
installed for the actual heating circuit.
• Heat source temperature if there are no
remote control installed.
2– Info line: display of time of day, day of the
week and date.
3Additional temperature display: outside
temperature, temperature of the solar
collector or a DHW system.
For ventilation: display of the ventilation level.
For ventilation: frost protection (reduced
ventilation).
4– Text information: e.g. the designation of the
temperature currently displayed (Fig. 4,
[1]). If a fault is present, corresponding
information will be displayed here until the
fault has been rectified.
5The key block is active (hold down the DHW
key and selector to activate or deactivate the
key block).
6 720 811 136-901.1O
6
1
3
7
2
4
5
5
6Solar circulation pump is in operation.
DHW heating is active
DHW thermal disinfection active
Extra DHW active
Pool heating active
Heating active
Cooling active
Energy supplier interruption
External input active (remote)
Holiday mode active
Time program active
Smart grid function active
Screed drying active
Electric booster heater active
Power guard active
Additional heat source active
Defrost function active
Compressor (Heat pump) active
An IP-module is installed and communication
to the server is active.
7Op. mode Operating mode: [Optimised operation] no
time program active.
Operating mode: [Program 1] | [Program 2]
automatic mode active (according to time
program) for displayed heating circuit.
Operating mode: heating mode active.
Operating mode: setback mode active.
Item Symbol Explanation

Operation
Compress 3400iAWS E – 6721852787 (2023/01)
8
3.2.1 Switching off
The user interface is powered via the BUS interface and is normally
switched on. The system should only be shutdown temporarily,
for example when cleaning filters. The complete system is deactivated
and there is no frost protection during a shutdown.
▶ To temporarily switch off the system:
– Press and hold the selector until a pop-up menu is displayed.
– Select Yes in the menu Switch to standby mode?
▶ To switch on the system:
– Press and hold the selector until a pop-up menu is displayed.
– Select Yes in the menu Switch from standby mode to normal
operation?
After a prolonged power failure or extended period of idleness, the date
and time may need to be reset. All other settings are retained
permanently.
3.2.2 Selecting a heating circuit for the standard display
The standard display only ever shows data for one heating circuit. If 2 or
more heating circuits are installed, a setting can be made to determine
which heating circuit the data in the standard display relates to.
▶ Press the selector and turn to select a heating circuit.
▶ Wait a few seconds or press the selector to confirm.
3.2.3 Set operating mode
Activate automatic mode (with time program)
If optimise operation is active:
▶ Press the menu key.
▶ Press the selector to open the Heating or Heating/Cooling menu.
▶ Press the selector to open the Op. mode menu.
▶ Highlight the desired heating circuit and press the selector.
▶Chooseauto and press the selector.
▶ Press and hold the dkey to return to the standard display.
A pop-up window is displayed and the time program is activated. The
currently valid temperature flashes.
Activating optimised operation (without time program)
If automatic mode is active:
▶ Press the menu key.
▶ Press the selector to open the Heating or Heating/Cooling menu.
▶ Press the selector to open the Op. mode menu.
▶ Highlight the desired heating circuit and press the selector.
▶ChooseOptimise and press the selector.
▶ Press and hold the dkey to return to the standard display.
A pop-up window is displayed and the required room temperature is
shown.
3.2.4 Changing the room temperature temporarily
Retaining automatic mode
▶ Turn and press the selector to set the required room temperature.
The corresponding time slot is displayed differently to the other time
slots.
The change applies until the next switching time in the active time
program is reached.
Cancelling the temperature change:
▶ Turn and press the selector to set the value stored in the time
program.
3.2.5 Changing the room temperature permanently
Optimised operation (without time program)
▶ Turn and press the selector to set the temperature.
-or-
▶OpentheHeating or Heating/Cooling > Temperature settings >
Optimised operation menu.
▶ Select the desired temperature and confirm or select Heating off
and confirm.
6 720 812 775-02.2O
6 720 812 775-03.1O
6 720 812 775-04.1O
0010021418-001
6 720 812 775-06.1O

Operation
9
Compress 3400iAWS E – 6721852787 (2023/01)
Automatic mode
▶OpentheHeating or Heating/Cooling > Temperature settings >
Heating, Setback or Cooling menu.
▶ Set the desired temperatures for each mode and confirm, or select
and confirm for the Heating off setback mode.
▶ Assign the operating modes to the required time slots via the time
program.
3.2.6 Adapting the heating system settings using the time
program (automatic mode)
Open the menu for adapting a time program for the heating system
▶ Open the main menu.
▶OpenthemenuHeating or Heating/Cooling > Time program > My
time program 1 or 2.
Selecting the day of the week or group of days
▶ Open the menu for adapting a time program for the heating system.
▶ Press the selector to activatethe input field for the day of the week or
group of days.
▶ Select a day of the week or group of days and confirm.
Moving switching time
▶ Open the menu for adapting a time program for the heating system.
▶ Turn and press the selector to activate the input field for a switching
time.
▶ Set and confirm the switching time.
Adjusting the temperature/operating mode for a time slot
▶ Open the menu for adapting a time program for the heating system.
▶ Turn and press the selector to activate the input field for the operating
mode of a time slot.
▶ Set and confirm operating mode.
Deleting switching time
▶ Open the menu for adapting a time program for the heating system.
▶ Select symbol for deleting switching time ( ) and confirm.
The symbol is associated with the switching time on the same line.
▶ Select Yes and confirm to delete the switching time.
The previous time slot is extended to the next switching time. The
switching times are automatically sorted in chronological order.
Copying time program
▶ Open the menu for adapting a time program for the heating system.
▶ Select the day of the week to be copied, e.g. Thursday.
6 720 811 136-07.1O
0010008191-001
0010010088-001
0010010089-001
0010010090-2001
0010010093-001
0010010094-001

Operation
Compress 3400iAWS E – 6721852787 (2023/01)
10
▶ Select and confirm Copy.
A pick list of the days of the week is displayed.
▶ Select days (e.g. Monday and Tuesday) that are to be overwritten
with the previously selected time program and confirm.
▶ Select and confirm Copy.
3.2.7 Selecting active time program for the heating system
▶ Open the main menu.
▶OpenHeating or Heating/Cooling > Time program > Activate
time program.
▶ Select My time program 1 or 2and confirm.
The user interface operates in automatic mode with the selected time
program. If 2 or more heating circuits are installed, this setting only
applies for the selected heating circuit.
3.2.8 Renaming a time program or heating circuit
Standard designations are preassigned to the time programs and
heating circuits.
Open the menu for renaming a time program
▶ Open the main menu.
▶OpentheHeating or Heating/Cooling > Time program > Heating
circuit 1...4 > Rename time prog. menu.
The cursor flashes to indicate the start position for data input.
Open the menu for renaming a heating circuit (only available if 2 or
more heating circuits are installed)
▶ Open the main menu.
▶OpenHeating or Heating/Cooling > Time program > Heating
circuit 1 > Rename heating circuit menu (or other heating circuit).
The cursor flashes to indicate the start position for data input.
Entering/adding characters
▶ Open menu for renaming a time program or heating circuit.
▶ Turn the selector to position the cursor in the required location.
▶ Press the selector to activate the input field (to the right of the
cursor).
▶ Select character and confirm.
The selected character is entered (added). The input field for the next
character in the text is activated.
▶ Press the dkey to complete the input.
Deleting characters/resetting name
To delete a character:
▶ Open menu for renaming a time program or heating circuit.
▶ Place the cursor behind the character to be deleted by turning the
selector.
▶ Press the selector to activate the input field.
▶ Select the character <C and confirm.
The character to the left of the input field is deleted.
To reset the name:
▶ Delete all characters.
The standard designation is entered again automatically.
0010004419.001
0010008189-002
0010008190-001
0010008233-001
0010008199-001
0010008200-001

Operation
11
Compress 3400iAWS E – 6721852787 (2023/01)
3.2.9 DHW settings
When the thermal disinfection function is activated, the DHW cylinder is
heated to the corresponding temperature set. The higher temperature
hot water can be used for thermal disinfection of the hot water system.
▶ Observe regional and local requirements and operating conditions
for the DHW circulation pump, including the water quality and
instructions of the heat source.
Select the operating mode for DHW heating
Press the DHW key
▶ Select and confirm Always on - DHW Eco+1)
Lowest DHW temperature mode that results in lowest energy
consumption.
-or-
▶Always on - DHW Eco
Medium DHW temperature mode that results in medium energy
consumption.
-or-
▶Always on - DHW comfort
Highest temperature mode that results in higher energy consumption
and may also lead to a higher sound level from the system.
The DHW temperatures for each mode is set by the installer.
Activate extra DHW cylinder charging
If you have a temporary need of more hot water outside of normal DHW
charging or time program:
▶ Press the button.
-or-
▶ Open the menu DHW > Extra hot water.
▶ Set the maximum DHW temperature and duration as desired.
▶ Select and confirm Start now.
▶ Select Yes in the pop-up window and confirm.
▶ The water heating becomes active immediately. Once the set
duration time has expired, the extra DHW cylinder charging switches
off again automatically.
Open the menu for adapting the time program for DHW heating
▶ Open the main menu.
▶OpentheDHW > Time program menu.
▶ Select Own time program and confirm.
▶ Set switching times and operation modes.
3.2.10 Setting up a holiday program
Open the menu for the holiday program
▶ Open the main menu.
▶ Open the menu Holiday > Holiday 1, 2, 3, 4or 5.
Once the holiday period for the chosen holiday program has been set,
the corresponding menu Holiday 1, 2, 3, 4or 5is displayed.
Setting the holiday period
▶ Open the menu for the holiday program.
▶ If the holiday period for the chosen holiday program has already been
set, open the Holiday period menu.
▶ Select and confirm the day, month and year for Start: and End: of the
holiday period.
▶ To complete the entry, select Next and confirm.
Setting the heating and DHW for the holiday program
▶ Open the menu for the holiday program.
▶OpentheSelection of htg circ./DHW menu.
1) Not available for fresh water station.
0010008204-001
0010008184-001
6 720 815 237-41.1O
0010008208-001
0010008209-001
6 720 811 136-34.1O

Operation
Compress 3400iAWS E – 6721852787 (2023/01)
12
▶ Select and confirm the heating circuits and DHW systems.
▶ The holiday program is valid for the selected heating circuits and
DHW systems.
▶ To complete the selection, select Next and confirm.
▶ Check the settings for Heating and DHW in the menu for the chosen
holiday program, and modify if required.
Interrupting a holiday program
During the holiday period, the display indicates until when the holiday
program will be active.
If 2 or more heating circuits are installed, the relevant heating circuit
must be selected in the standard display before interrupting the holiday
program.
If the holiday program is set to As Saturday:
▶ Turn the selector and set the desired temperature.
The change applies until the next switching time in the active time
program is reached.
If no time program is active the holiday program is interrupted by
deleting it.
Clearing a holiday program
▶ Open the menu for the holiday program.
▶ Select and confirm Delete.
▶ Select Yes in the pop-up window and confirm.
The holiday program is deleted.
3.2.11 More settings
Setting the time and date
If the user interface has been disconnected from the power supply for a
prolonged period, the date and time must be set:
▶ Restore the power supply.
The user interface displays the setting for the date.
▶ Set the day, month and year respectively and confirm.
▶ Confirm Next.
The user interface displays the setting for the time.
▶ Set the hours and minutes respectively and confirm.
▶ Confirm Next.
No other settings are required for recommissioning.
Switching the key block on/off
To switch the key block on or off:
▶ Press the selector and DHW key simultaneously until the key symbol
in the display appears/disappears.
Setting up the favourite functions
The fav key gives direct access to often used functions for heating circuit
1. Press the key once to open the menu.
To adapt the list of favourites in the menu:
▶ Press and hold the fav key until the configuration menu is displayed.
▶ Turn and press the selector to select a function (Yes) or to cancel the
selection (No).
▶ Press the dkey to close the menu.
0010008211-001
6 720 811 136-36.1O
0010008212-001
0010003250.002
0010003251.001
6 720 811 136-15.1O

Operation
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Compress 3400iAWS E – 6721852787 (2023/01)
3.3 Main menu
Depending on the heating appliance and how the user interface is used,
not all menu items will be available for selection; see overview of main
menu at the end of this document.
3.3.1 Heating settings
Menu: Heating
Table 4 Heating settings
Adapting the Time program for the automatic mode
Menu: Time program
Table 5 Time program settings for heating
Setting the summer/winter switchover threshold
CAUTION
Risk of system damage!
▶ Do not switch over to summer mode if there is a risk of frost.
Menu: Summer/winter changeover
Table 6 Settings for the summer/winter changeover
Setting the DHW alternating operation
If DHW alternating operation is not activated, DHW heating has priority
and interrupts the heat requirement of the heating system, if necessary.
Menu: DHW alternating operation
Table 7 Settings for the DHW alternating operation
3.3.2 DHW settings
Using the extra DHW, thermal disinfection or daily heat up functions can
lead to higher electricity cost as the electric booster heater may be
activated.
If a fresh water station is installed, setting the DHW temperature ≥ 52 °C
can lead to higher electricity cost as the electric booster heater may be
activated.
Menu item Description
Op. mode Select the heating operating mode: optimised or
based on time program.
Temperature
settings
Temperatures for the levels [Heating], [Setback ]or
[Optimised operation] can be set in this menu.
Time program see Tab. 5
Summer/winter
changeover
see Tab. 6
DHW alternating
operation
see Tab. 7
Menu item Description
Activate time
program
Activating automatic mode triggers control of the
room temperature according to the settings in the
selected time program [My time program 1] or [My
time program 2].
My time program
1
2 switching times can be set for each day or group of
days. One of the two operating modes (or a
temperature) can be assigned to each switching
time in automatic mode. The minimum duration of a
time slot between two switching times is
15 minutes.
Resetting prog. The default setting for [My time program 1] can be
restored here.
My time program
2
See [My time program 1]
Resetting prog. The default setting for [My time program 2] can be
restored here.
Rename time
prog.
The names of the time programs can be changed in
the same way as the names of the heating circuits.
This helps to select the correct time program,
e.g. “family” or “night shift”.
Menu item Description
Heating/Cooling • In summer, heating/cooling mode can be
switched off [Continuous summer].
• The heating/cooling mode can be activated/shut
down based on the outside temperature (this is
only available if the [Automatic mode] is active in
the heating circuit).
• The heating mode can be active [Continuous
heating]. However, heating starts only if it is too
cold inside.
• The cooling mode can be active [Cooling].
However, cooling starts only if it is too hot inside.
If more than one heating circuit is installed, [Heating
circuit 1 ... 4] is displayed instead of this menu item.
Heating mode
from1)
1) This menu item is only displayed if the outdoor-temperature-dependent
switching between summer and winter modes is active for the heating circuit
concerned.
If the outside temperature2) falls below the
temperature threshold set here, the heating system
is switched on. In systems with more than one
heating circuit, this setting always relates to the
corresponding heating circuit in each case.
2) When the outside temperature is adjusted (damped), changes to the measured
outside temperature are delayed and fluctuations reduced.
Cooling mode
from
If the outside temperature exceeds the temperature
threshold set here, the heating system is switched
off and cooling is enabled. In systems with more
than one heating circuit, this setting always relates
to the corresponding heating circuit in each case.
Menu item Description
DHW alt.
operation on
In the event of simultaneous DHW and heating
demand, the system will alternate between DHW
heating and heating mode based on the times set in
[Prioritise DHW for] and [Heating priority for].
Prioritise DHW
for
Duration of DHW heating.
Heating priority
for
Duration of heating mode.

Operation
Compress 3400iAWS E – 6721852787 (2023/01)
14
Setting the operation mode for DHW heating
The installer sets the temperatures for the different modes.
Menu: Op. mode
Table 8 Settings for operation mode of DHW
Setting the time program for DHW heating
Menu: Time program
Table 9 Time program settings for DHW
Activating extra DHW heating
Menu: Extra hot water
Table 10 Settings for the extra hot water function
Thermal disinfection
WARNING
Danger to life from legionella!
Legionella can form in domestic hot water at DHW temperatures that are
too low.
▶ Activate thermal disinfection
-or-
▶ Have daily heat-up set in the service menu by the specialist
technician.
▶ Thermal disinfection may be terminated prematurely due to the
system configuration or frequent water extraction. In this case the
control unit issues a fault display. When thermal disinfection is
activated, attention must be paid to ensuring, that this is performed
successfully without a fault display.
▶ Observe the statutory regulations on drinking water.
If the thermal disinfection has terminated prematurely a notification is
shown in the display. The system will repeat the thermal disinfection 24
hours later.
If the thermal disinfection is set and activated at an external heat source,
the settings at the user interface have no effect on the thermal
disinfection.
WARNING
Risk of scalding!
If thermal disinfection or the daily heat-up has been activated to avoid
legionella, the DHW is heated once to above 60 °C (e.g. Tuesday night at
02:00).
▶ Only carry out thermal disinfection/daily heat-up outside the normal
hours of use.
▶ Make sure that a mixer is installed. If in doubt, ask your expert.
Menu: Autom. therm. disinfect.
Table 11 Settings for thermal disinfection
Menu item Description
Op. mode • [Off]: Deactivated, no DHW production.
• [Always on - DHW Eco+]1): Lowest DHW
temperature mode that results in lowest energy
consumption.
• [Always on - DHW Eco]: Medium DHW
temperature mode that results inmedium energy
consumption.
• [Always on - DHW comfort]: Highest
temperature mode that results in higher energy
consumption.
• [Own time program]: DHW time program that
operates independently of any heating circuit
time program.
1) Not available for fresh water station
Menu item Description
My DHW time
prog.
Own time program for DHW heating that works
independently of the time program for the heating
system. 6 switching times can be set for each day or
group of days. One of the operating modes can be
assigned to each switching time in automatic mode.
The minimum duration of a time slot between two
switching times is 15 minutes.
Resetting prog. The time program for the DHW system is reset to the
default setting with this menu item.
Menu item Description
Start now/
Cancel now
After activation of the extra hot water function, DHW
is heated for the set duration to the set temperature.
When the function is active, [Cancel now] is
displayed in the menu. Select this setting for
immediate deactivation of the extra hot water
function.
Temperature Desired DHW temperature for the extra hot water
function.
Duration Duration for the extra hot water function. When the
time has expired, the function automatically
switches off and the system goes back to normal
DHW operation.
Menu item Description
Start The entire DHW volume is automatically heated to
the set temperature once a week or daily, if [Auto] is
set here.
Start now/
Cancel now
Immediate start or cancellation of thermal
disinfection independently of the set day of the
week.
Weekday Day of the week, on which thermal disinfection is
automatically carried out once a week, or daily
thermal disinfection.
Time of Day Time of day for the automatic start of thermal
disinfection.

Operation
15
Compress 3400iAWS E – 6721852787 (2023/01)
Setting the DHW alternating operation
If DHW alternating operation is not activated, DHW heating has priority
and interrupts the heat requirement of the heating system, if necessary.
Menu: DHW alternating operation
Table 12 Settings for the DHW alternating operation
Settings for the DHW circulation
Menu: Circulation
Table 13 Settings for the circulation
3.3.3 Settings for the venting function
Menu: Ventilation
Table 14 Ventilation settings
Settings for a swimming pool
Menu: Pool
Table 15 Settings for pool heating
Menu item Description
DHW alt.
operation on
In the event of simultaneous DHW and heating
demand, the system will alternate between DHW
heating and heating mode based on the times set in
[Prioritise DHW for] and [Heating priority for].
Prioritise DHW
for
Duration of DHW heating.
Heating priority
for
Duration of heating mode.
Menu item Description
Op. mode • [Off]: Circulation is switched off permanently.
• [On]: The pump will run according to the settings under
[Start frequency]. The time program for the DHW
circulation pump is not active.
• The circulation can be linked to the time program for
DHW heating.
• [My circulation time prog.]: Set a time program for the
DHW circulation pump that works independently of the
time program for DHW.
Start frequency The start frequency determines how often the DHW
circulation pump goes into operation for three minutes at a
time every hour (1 x 3 minutes/h ... 6 x 3 minutes/h) or if it
is constantly in operation. Whatever the case, circulation is
only active during the times set in the time program.
My circulation time
prog.
6 switching times can be set for each day or group of days.
The DHW circulation pump can be switched on or off at
each switching time. The minimum duration of a time slot
between two switching times is 15 minutes.
Resetting prog. The time program is reset to factory default.
Menu item Description
Op. mode [Select vent. operating mode.]
• [Sleep]
• [High vent. rate] (high ventilation rate)
• [Auto (time program)]
• [Demand-ctrlled] (demand controlled)
• [Ex.air bypass] (exhaust air bypass)
• [Party vent.] (party ventilation)
• [Firepl.] (fireplace)
• [Fan speed 1 ... 4]
• [Ventil. switched off] (ventilation off)
Time program [Enter vent. time program.]
Reset time prog. [Reset ventilation time program.]
Humidity [Setting the desired humidity level]:
•[Dry]
•[Normal]
•[Moist]
Air quality [Setting the desired air quality level:
•[Adequate]
•[Normal]
• [High]
Bypass [Bypass] for more opening hours:
•[Open]
•[Close.]
Supply air temp.
control
Set the [Supply air temp.]:
• [Heating]
• [HtgCool] (heating and cooling)
• [Cooling]
•[Off]
Supply air temp.
control (Electric)
Set the [Supply air temp.]:
• [Heating]
•[Off]
Reheat supp.air
temp.
[Set the desired supply air temp. of reh. bank.]
10 ... 22 ... 30 °C
Filter timer [Set the time in months until the next filter change.]
1 ... 6 ... 12 Months
Confirm filter
change
The filters in the ventilation unit must be changed.
Please confirm the filter change.
Rename ventil.
zone
The names of the ventilation zones can be changed
in the same way as the names of the heating
circuits. This helps inchoosing the right ventilation
zone.
Menu item Description
Switch on pool
heating
This setting enables the pool heating when it is
activated.
Pool
temperature
The water in the pool is heated to this temperature.
Allowadd.heater
for pool
This setting allows the auxiliary heater to supply
heating for the pool if the heat pump cannot reach
the set temperature.
Menu item Description

Operation
Compress 3400iAWS E – 6721852787 (2023/01)
16
3.3.4 Setting up a holiday program
Menu: Holiday
CAUTION
Risk of system damage!
▶ Before a prolonged period of absence, only change the settings
under Holiday.
▶ After a long absence, check the operating pressure of the heating
system and check the pressure gauge of the solar system if
applicable.
▶ Do not switch off the solar system during long absences.
Cooling mode will not be activated during a holiday program.
Menu: Holiday 1, Holiday 2, Holiday 3, Holiday 4 and Holiday 5
Table 16 Settings for holiday programs
Settings for smart grid
This menu is only available if a smart grid system is installed.
If smart grid energy is available and a buffer cylinder is installed with all
heating circuits mixed, the buffer cylinder will be heated to the heat
pump maximum temperature.
Table 17 Settings in the smart grid data menu
Settings for a photovoltaic system
Make the photovoltaic (PV) specific settings in this menu. Select if the
available energy should be used for Heating or DHW.
If photovoltaic energy is available and a buffer cylinder is installed with all
heating circuits mixed, the buffer cylinder will be heated to the heat
pump maximum temperature.
Menu: PV system
Table 18 Settings in the PV system data menu
Settings for the energy manager
Make the energy manger (EM) specific settings in this menu.
Menu: Energy manager
Table 19 Settings in the EM system data menu
3.3.5 General Settings
Menu: Settings
Menu item Description
Holiday period Set the start and end date of the absence during
holiday: the holiday program starts at the set start
time at 00:00 o'clock. The holiday program ends at
the set end time at 24:00 o'clock.
Selection of htg
circ./DHW
The holiday program is applied to the sections of the
system highlighted here. Only the heating circuits
and DHW systems actually installed in the system
are available for selection.
Heating Control of the room temperature for the selected
heating circuits during the holiday period:
• Any [Constant temperature] can be set for the
selected heating circuits throughout the entire
holiday period.
• The [Off ]setting deactivates the heating system
completely for the selected heating circuits.
DHW DHW settings for the selected DHW systems during
the holiday period.
• If [Off] is set, no DHW at all will be available
during the holiday period.
• If [Off + therm. disinfection on] is set, DHW
heating is deactivated but thermal disinfection is
still carried out as normal either once a week or
once a day.
Note: If the holiday is spent at home, the DHW
systems must not be selected under [Selection of
htg circ./DHW] to ensure DHW remains available.
Delete Delete all settings for the selected holiday program
Menu item Control range: Function description
Heating The energy available in the smartgrid is used for heating, if
the system is in heating mode.
[Selectable peak]: 0...5 °C
Set how much the room temperature may be increased.
[Forced peak]: 2...5 °C
Set how much the room temperature is forced to increase.
DHW The energy available in the smart grid is used for DHW.
[Selectable peak]: [Yes] | [No]
If enabled the DHW is heated to the temperature set for
DHW operating mode [Always on - DHW comfort]. No
heating is done if the holiday program is active.
Menu item Control range: Function description
Heating peak The energy available in thePV system is used for heating, if
the system is in heating mode.
Set how much the room temperature may be increased
[0...5] K.
DHW peak The energy available in the PV system is used for DHW.
[Yes] | [No]
If enabled the DHW is heated to the temperature set for
DHW operating mode [Always on - DHW comfort]. No
heating is done if the holiday program is active.
Cooling setback
mode
The energy available in the PV system is used for cooling, if
the system is in cooling mode.
Set how much the room temperature may be decreased
[-5...0] K.
Menu item Control range: Function description
Heating peak The energy available in the energy management system is
used for heating, if the system is in heating mode.
Set how much the room temperature may be increased
0...5 °C.
Only cool with EM Cooling mode is activated only if energy is available in the
energy management system.
[Yes] | [No]
If enabled the room temperature is decreased to the
temperature set for cooling operating mode. No cooling is
done if the holiday program is active.
Menu item Description
Language Language of the display texts
Time format Switch the format for display of the time of day
between 24-hour and 12-hour format.
Time of Day Set actual time. All time programs and thermal
disinfection run according to this time.
Date format Change the format of the date.
Date Set actual date. The holiday program, for example,
runs based on this date. The current day of the week
is also determined based on this date; this affects
the time programs and thermal disinfection,
for example.
Menu item Control range: Function description

Operation
17
Compress 3400iAWS E – 6721852787 (2023/01)
Table 20 General Settings
3.3.6 Settings for other systems or devices
If other specific systems or devices are installed in the system, additional
menu items will be available. Depending on which system or device is
being used and the associated assemblies or components, various
settings can be made. Observe the additional information on the settings
and functions in the technical documentation for the relevant system or
device.
3.4 Calling up information about the system
The current system values and the active operating conditions can be
displayed easily via the info menu. No changes can be made in this menu.
To open the info menu:
▶ Press the info key in the standard display.
Menu: Sum./winter changeover
Table 21 Information about the heating
Menu: DHW
Table 22 Information about DHW
Menu: Ventilation
Table 23 Information about the ventilation unit
Menu: Pool
Table 24 Information about pool
Menu: Operating data
Auto. time
switchover
Activate or deactivate the automatic changeover
between summer and winter time. If [Yes] is set, the
time of day is automatically changed (from 02:00 to
03:00 on the last Sunday in March and from 03:00
to 02:00 on the last Sunday in October).
Display contrast Change the contrast (for improved clarity).
Warning sound
blocked
If a buzzer has been installed a warning sound is
emitted as soon as an alarm occurs. The warning
sound can be suppressed at a settable time interval.
Reduced DHW
temp.
Setting for the reduced DHW mode. If [Yes] is set,
the DHW temperature is reduced if there are a
compressor fault. The function is used to reduce the
use of the auxiliary heater.
DHW temp.
correction
Correction of the DHW temperature displayed by
the user interface by up to ± 10 °C. The function is
used for a more accurate representation of the DHW
tap temperature as the temperature sensor is
positioned at a distance from the DHW outlet.
Time correction Time correction of the internal clock of the user
interface in s/week.
Standard display Settings for the display of additional temperatures in
the standard display.
Internet
password
Reset the personal password for the Internet
connection (only available if a communication
module is installed). The next time you log in, e.g.
using an App, you will automatically be prompted to
assign a new password.
Internet Make settings for the Internet connection (only
available if a communication module is installed).
• [Establish connection]
– [Pairing-Status]
– [Activate hotspot]
– [Activate WPS]
• [Terminate connection]
– [Connected network]
– [Terminate connection]
Low-noise
operation
If activated the heat pump will run in reduced sound
operation during the set time period.
• [Low-noise operation of]: set the start time for
the low noise operation.
• [Low-noise operation until]: set the stop time for
the low noise operation.
• [Min. outside temp.]: Below this outdoor
temperature the heat pump switches over to
normal operation.
Reset Reset all settings to the values set at commissioning.
Menu item Description
Menu item Description
Heating/cooling
mode
Currently valid operating mode in the selected
heating circuit.
Set room temp. The desired room temperature that is currently valid
in the selected heating circuit:
• In automatic mode, this can change several times
a day, if necessary.
• In normal operation, it is always constant.
Measured room
temp.
Currently measured room temperature in the
selected heating circuit
Measured flow
temp.
Currently measured flow temperature in the
selected heating circuit
Menu item Description
Set temp. Desired DHW temperature.
Measured temp. Currently measured DHW temperature.
Menu item Description
Op. mode Currently selected operating mode and ventilation level
Outside temperature Display of Outside temperature
Supply air temp. Display of supply air temperature
Ex.air temp. Display of extract air temperature
Exhaust air temp. Display of exhaust air temperature
Reheat supp.air temp. Display of supply air temperature from the re-heater
Ex.air humid. Display of exhaust air humidity
Ex.air quality Display of exhaust air quality
Humidity remote ctrl Display of humidity in the installation room of the
remote control
Amb. air humid. Display of ambient air humidity
Amb. air quality Display of ambient air quality
Bypass Display of bypass-settings
Rem. filter elapsed
time
Display of duration in days until the next filter change
Menu item Description
Set pool
temperature
Desired pool temperature.
Current pool
temperature
Currently measured pool temperature.
Menu item Description
Control
operating hours
Hours run by the control since the heat pump was
commissioned or since the last reset.
Aux. heater
energy cons.
Output of the electric booster heater since
commissioning or since the last reset.
Op. hours for
comp. heat.
Hours run by the compressor in heating mode since
commissioning or since the last reset.

Operation
Compress 3400iAWS E – 6721852787 (2023/01)
18
Table 25 Operation data
Menu: Energy consump.
Table 26 Total energy consumption data
Menu: Energy consump. > Electric auxiliary heater
Table 27 Energy consumption data for electric booster heater
Menu: Energy consump. > Compressor
Table 28 Energy consumption data for heat pump
Menu: Energy supplied
Table 29 Energy output data for heat pump
Menu: Solar
Table 30 Information about the solar system
Menu: Outdoor temp
The currently measured outside temperature is displayed in this menu. In
addition, a diagram of the outside temperature profile for today and
yesterday (from 00:00 to 24:00 in each case) is displayed here.
Menu: Internet
Table 31 Information about the Internet connection
3.5 Faults
If a fault persists:
▶ Confirm the fault by pressing the selector.
▶ Faults that are still active are displayed by pressing the dkey.
▶ Call an authorised contractor or customer service and give them the
fault code and sub-code, as well as the ID no. of the user interface.
Table 32 Your contractor must enter the ID no. here.
Faults on additional heat source:
▶ Check the display of the additional heat source for information.
▶ Reset the additional heat source.
▶ If the fault persists; contact your contractor.
3.6 Connect-Key K 30 RF
Connect-Key K 30 RF is a WLAN communication module for controlling
and monitoring your heating system remotely. It is used as an interface
between the heating system and the Internet.
For further information on how to use and install the Connect-Key K 30
RF, please read the installation manual of the accessory.
A WLAN router, internet connection and the Bosch HomeCom Easy app
are required to use this product.
Op. hours for
comp. cool.
Hours run by the compressor in cooling mode since
commissioning or since the last reset.
Op. hours for
comp. DHW
Hours run by the compressor in DHW operation
since commissioning or since the last reset.
Op. hours for
comp. pool
Hours run by the compressor in pool operation since
commissioning or since the last reset.
Number of
heating starts
Number of compressor starts in heating mode since
commissioning or since the last reset.
Number of
cooling starts
Number of compressor starts in cooling mode since
commissioning or since the last reset.
Number of DHW
starts
Number of compressor starts in DHW operation
since commissioning or since the last reset.
Number of pool
starts
Numberof compressorstarts in pool operationsince
commissioning or since the last reset.
Menu item Description
Total Cumulated total energy consumed by the heating
system.
Menu item Description
Total Cumulated total energy consumed by the electric
booster heater.
Heating Cumulated energy consumed by the electric booster
heater in heating mode.
DHW Cumulated energy consumed by the electric booster
heater in DHW mode.
Pool Cumulated energy consumed by the electric booster
heater in pool heating mode.
Menu item Description
Total Cumulated total energy consumed by the heat
pump.
Heating Cumulated energy consumed by the heat pump in
heating mode.
DHW Cumulated energy consumed by the heat pump in
DHW mode.
Cooling Cumulated energy consumed by the heat pump in
cooling mode.
Pool Cumulated energy consumed by the heat pump in
pool heating mode.
Menu item Description
Total energy
suppl.
Cumulated total energy output of the heat pump.
Heating energy
suppl.
Cumulated energy output of the heat pump in
heating mode.
DHW energy
suppl.
Cumulated energy output of the heat pump in DHW
mode.
Emitted cooling
energy
Cumulated energy output of the heat pump in
cooling mode.
Pool energy
suppl.
Cumulated energy output of the heat pump in pool
heating mode.
Menu item Description
Menu item Description
Solar sensor
(graphic)
Current measured temperatures with display of
position of the selected temperature sensor in the
solar system hydraulics (with graphic visualisation
of the current operating conditions of the actuators
in the solar system).
Solar yield Solar yield for last week, solar yield for current week
and total yield of solar systemsince the solar system
was commissioned.
Menu item Description
IP connection Status of the connection between communication
module and router.
Server
connection
Status of the connection between communication
module and Internet (via the router).
Connected
network
Status of the connection between communication
module and the network and display of WLAN-SSID.
IP address IPV4 address of the communication module.
SW version Software version of the communication module.
Login data Login name and password for the login into the App
to operate the system via a smartphone.
MAC address MAC address of the communication module.
__ _

Maintenance
19
Compress 3400iAWS E – 6721852787 (2023/01)
4 Maintenance
DANGER
Risk of electric shock.
Grave personal injuries may occur.
▶ Disconnect the power supply before carrying out maintenance work.
Using the wrong cleaning product may damage the units!
▶ Do not use acid or chlorine based products or products that contain
abrasives.
4.1 Indoor unit
Check the following points a couple of times a year:
▶ Checking the operating pressure
▶ Overheating protection
▶ Particle filter
▶ Moisture in cooling mode
▶Safetyvalves
4.1.1 Checking the operating pressure
The pressure should be checked 1-2 times per year.
▶ Check the pressure at the pressure gauge.
▶ If the pressure is less than 0.5 bar, increase the pressure slowly to
max. 2 bar by filling with water via the fill valve.
▶ If you have any questions about the procedure, consult the installer of
the system.
Fig. 5 AWS E indoor unit (view with drip tray)
[1] Pressure gauge
4.1.2 Overheating protection
Overheating protection is only available in indoor units with integrated
booster heater. The overheating protection has to be manually reset if it
is triggered.
To reset the overheating protection on AWS E :
▶ Contact the installer or dealer.
4.1.3 Particle filter
WARNING
Strong magnet!
Can be harmful to pacemaker wearers.
▶ Do not clean the filter or check the magnetite indicator if you are a
pacemaker wearer.
The filter prevents particles and contamination from entering the heat
pump. Over time, the filter may become blocked and must be cleaned.
The system does not need to be emptied to clean the filter. The filter is
integrated into the shut-off valve.
Cleaning the strainer
▶ Close the valve (1).
▶ Unscrew the cap (manually) (2).
▶ Take out the strainer and clean it with running water over it or by
pressure cleaning.
▶ Check attached debris on the cap’s magnet (3) and clean it.
▶ Reinstall the strainer (4). For proper assembly, make sure that the
guide bumps fit into the recesses in the valve.
▶ Screw the cap back on (hand tight).
▶ Open the valve (5).
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Maintenance
Compress 3400iAWS E – 6721852787 (2023/01)
20
Fig. 6 Cleaning the strainer
4.1.4 Moisture in cooling mode
NOTICE
If moisture frequently forms near the indoor unit or the fan convectors in
cooling mode, this could mean that the condensation insulation is
defective.
▶ If moisture forms in the vicinity ofcomponents of the heating system,
switch the heat pump off and consult the system installer.
4.1.5 Checking the safety valves
The safety valves should be checked 1-2 times each a year.
Water is expelled from the safety valve during heat-up. Never close the
safety valve.
▶ The safety valve should only let water out if the maximum pressure is
exceeded. Contact the installer if water is coming from the safety
valve at pressures below 2 bar.
▶ The drainage hose from the safety valve shall be discharged into the
drainage.
4.2 Heat pump (outdoor unit)
The following inspection and maintenance steps are carried out several
times per year in order that the heat pump's maximum output will be
maintained:
▶ Removing dirt and leaves
▶Casing
▶Evaporator
▶ Snow and ice
DANGER
Risk of electric shock.
▶ Always de-energize the electrical connection before carrying out
maintenance work on the device (fuse, circuit breaker).
Damage to system due to use of unsuitable cleaning agents!
▶ Do not use acidic or alkaline cleaning agents or cleaning agents
containing chlorine or abrasive products.
▶ Do not use strong alkaline cleaning agents, e.g. sodium hydroxide.
4.2.1 Removing dirt and leaves
▶ Remove dirt and leaves with a brush.
4.2.2 Casing
Dust and other dirt particles concentrate in the heat pump's outdoor unit
over time.
▶ If required, clean the outside with a damp cloth.
▶ Spot repair cracks and damage on the casing with anti-corrosive
paint.
▶ Standard car wax can be applied to protect the paint.
4.2.3 Evaporator
Wash off any layers of e.g. dust or dirt deposited on the surface of the
evaporator.
WARNING
The thin aluminium fins are sensitive and can be damaged easily through
incorrect handling. Never dry the fins directly with a cloth.
▶ Wear protective gloves during cleaning to protect your hands from
cuts.
▶ Never use high water pressure.
Cleaning the evaporator:
▶ Spray detergent on the evaporator fins on the back of the heat pump.
▶ Rinse all coatings and cleaning agents off completely with water.
4.2.4 Snow and ice
In certain geographical regions or during periods of heavy snow, snow
can get stuck on the back and the top of the heat pump. To prevent
subsequent formation of ice, remove the snow.
▶ Clear the snow off the top.
▶ Hot water can be used to rinse off the ice.
Moisture can form under the CS3400iAWS outdoor unit due to
condensate not falling into the condensation catch pan. This is normal
and no special action is required.
4.3 Tightness test
Under the current EU Directives (F-Gas Regulation, EC Regulation No.
517/2014, which entered into force on 1 January 2015), operators of
equipment containing fluorinated greenhouse gases in an amount of five
tonnes or more of CO 2 equivalent that are not part of foams must ensure
that the equipment is checked for leaks.
The tightness test must be carried out during installation and then every
12 months.
▶ Consult an installer.
1.
2.
12
3
2.
1.
5
4
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