Bosch AWE User manual

6721835317 (2021/09) GB
Installation Manual
Indoor unit for air to water heat pump
AWE
AWE 5-9 | 13-17

Table of contents
AWE – 6721835317 (2021/09)
2
Table of contents
1 Explanation of symbols and safety instructions . . . . . . . . . . . 3
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 3
2 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Supplied parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Information on the indoor unit. . . . . . . . . . . . . . . . . . . . . 5
3.3 Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . 5
3.4 Type plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.5 Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.6 Product dimensions and minimum clearances. . . . . . . . 6
4 Preparing for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Assembly of the indoor unit. . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Minimum volume and execution of the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Transport and storage . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.3 Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.4 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.4.1 Connecting the indoor unit to the heat pump and
the heating system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.4.2 Outdoor unit, indoor unit and heating system
filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4.3 Heating circuit pump (PC1). . . . . . . . . . . . . . . . . . . . . . 11
5.4.4 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.1 Venting the outdoor unit, indoor unit and heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6.2 Adjusting the operating pressure of the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Operation without heat pump (individual
operation). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4 Function test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4.1 Pressure switch and overheating protection . . . . . . . . 17
6.4.2 Operating temperatures . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1 Particle filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.2 Replacing components . . . . . . . . . . . . . . . . . . . . . . . . . 18
9 Installation of accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.1 EMS-BUS for accessories . . . . . . . . . . . . . . . . . . . . . . . 19
9.2 External connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.3 Maximum sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.4 Installation of the domestic hot water cylinder . . . . . . 19
9.5 DHW cylinder temperature sensor TW1 . . . . . . . . . . . . 20
9.6 Diverter valve VW1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.7 Domestic hot water cylinder, solar thermal heating . . . . 20
9.8 Room controller (Bosch CR10H only). . . . . . . . . . . . . . 21
9.9 Several heating circuits (with heating circuit
module) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9.10 Circulation pump for DHW PW2 . . . . . . . . . . . . . . . . . . 21
9.11 Installation with swimming pool . . . . . . . . . . . . . . . . . . 21
9.12 Buffer, VC0 bypass valve. . . . . . . . . . . . . . . . . . . . . . . . 21
9.13 IP module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10 Environmental protection and disposal . . . . . . . . . . . . . . . . . 22
11 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
11.1 Specifications – Indoor unit with electrical
booster heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
11.2 Hydraulic configuration. . . . . . . . . . . . . . . . . . . . . . . . . 24
11.2.1 Explanations of the system solutions . . . . . . . . . . . . . . 24
11.2.2 Bypass for the heating system . . . . . . . . . . . . . . . . . . . 24
11.2.3 Non-return valve in the heating circuit . . . . . . . . . . . . . 24
11.2.4 Heat pump with indoor unit, electric booster
heater and domestic hot water cylinder. . . . . . . . . . . . 25
11.2.5 Heat pump with indoor unit, electric booster
heater, domestic hot water cylinder and buffer. . . . . . 26
11.2.6 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . 27
11.3 Wiring diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11.3.1 CAN-BUS/EMS-BUS for indoor unit with electric
booster heater – Overview . . . . . . . . . . . . . . . . . . . . . . 28
11.3.2 Single-phase heat pump with three-phase
integrated electric booster heater . . . . . . . . . . . . . . . . 29
11.3.3 Heat pump (three-phase current) with integrated
electric booster heater (three-phase current). . . . . . . 30
11.3.4 Wiring diagram of installation module with
integrated electric booster heater . . . . . . . . . . . . . . . . 31
11.3.5 Alternative installation of 3-way diverter valve . . . . . . 32
11.3.6 Measurements from temperature sensors . . . . . . . . . . 32
11.3.7 Cable diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11.4 System Commissioning Report. . . . . . . . . . . . . . . . . . . 34
12 Benchmark Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Explanation of symbols and safety instructions
3
AWE – 6721835317 (2021/09)
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 and can 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 informationwhere there is no risk to
people or property.
Additional symbols
Table 1
1.2 General safety instructions
HNotices for the target group
These installation instructions are intended for gas,
plumbing, heating and electrical contractors. All
instructions must be observed. Failure to comply with
instructions may result in material damage and
personal injury, including danger to life.
▶ Read the installation, service and commissioning
instructions (heat source, heating controller,
pumps, etc.) before installation.
▶ Observe the safety instructions and warnings.
▶ Follow national and regional regulations, technical
regulations and guidelines.
▶ Record all work carried out.
HIntended use
This product is intended for use in sealed heating
systems in residential buildings.
Any other use is considered as not intended. Liability
will not be assumed for any resulting damage.
HInstallation, commissioning and service
The product may only be installed, brought into
operation and maintained by trained personnel.
▶ Use only original spare parts.
HHandover to the user
When handing over, instruct the user how to operate
the heating system and inform the user about its
operating conditions.
▶ Explainhowtooperatetheheatingsystemanddraw
the user's attention to any safety relevant action.
▶ In particular, point out the following:
– Modifications and repairs must only be carried
out by an approved contractor.
– Safe and environmentally compatible operation
requires inspection at least once a year and
proper cleaning and maintenance.
▶ Point out the possible consequences (personal
injury, including danger to life or material damage)
of non-existent or improper inspection, cleaning
and maintenance.
▶ Leave the installation instructions and the
operating instructions with the user for
safekeeping.
2Regulations
This is an original manual. This manual may not be translated without the
approval of the manufacturer.
Follow the directives and regulations given below:
• Local provisions and regulations of the electricity supplier and
corresponding special rules
• National building regulations
•F-Gas regulation
•EN 50160 (Voltage characteristics of electricity supplied by public
electricity networks)
•EN 12828 (Heating systems in buildings - Design for water-based
heating systems)
•EN 1717 (Protection against pollution of potable water installations
and general requirements of devices to prevent pollution by
backflow)
•EN 378 (Refrigerating systems and heat pumps - Safety and
environmental requirements)
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)

Regulations
AWE – 6721835317 (2021/09)
4
2.1 Water quality
Water quality in the heating system
Heat pumps operate at lower temperatures than other heating systems
which means that the thermal de-airing is not as effective and oxygen
levels are never as low as with a system incorporating an electric/oil/ gas
boiler. This means that the heating system will be more susceptible to
corrosion when exposed to aggressive water.
Preventive actions are required if the heating systems require recurrent
filling or where a heating water sample does not show clear water.
Preventive actions can be to supplement the heating system with a
magnetite filter and a de-airing valve.
Actions when the heating system requires recurrent filling:
▶ Check that the volume of the expansion vessel is sufficient for the
heating system volume.
▶ Replace the expansion vessel.
▶ Check the heating system for leakages.
A systemseparation with the help of a heat exchanger may be required if
the limits in table 2 can not be achieved.
The limits stated in table 2 are required to ensure the output data and
operation of the heat pump throughout its entire life span.
Table 2 Water quality
Additional water treatment to prevent lime-scale deposits
Poor quality of the heating water promotes the formation of sludge and
lime-scale. This can lead to malfunctions and damage of the heat
exchanger in the heat pump. According to the current guideline VDI
2035 “Avoidance of Damage in hot water heating systems” and
depending on the degree of hardness of the filling water, the system
volume and the total output of the system, water treatment may be
required to avoid damage due to the formation of lime-scale.
NOTICE
Risk of damage to system or appliance!
Debrisfromthesystemcandamagetheappliance and reduceefficiency.
▶ Follow the guidance of BS7593 for treatment of water in domestic
hot water heating systems1).
▶ Do not use anti-freeze/glycol products.
Suitable water treatment products (inhibitors/cleaners) can be
obtained from the following manufacturers:
Table 3
If the limits for water hardness stated in table 2 are exceeded, the
performance of the heat pump will deteriorate over time. If this
performance degradation can be accepted, the limits in figure 1 are
required to ensure the operation of the heat pump throughout its entire
life span.
Table 4 Table for heat pumps
Fig. 1 Limits for water treatment in heat pump systems
A Use completely de-mineralized fill water above the curve,
conductivity ≤ 10 microsiemens /cm.
B Use untreated tap water below the curve. Fill according to the
drinking water regulation.
HwWater hardness.
V Total water volume: Fill volume of the heating system and top-up
volume over the life span of the heat pump.
Ifthe totalwatervolumeis abovethelimit curvein the diagram (Fig. 1)
suitable measures are required for water treatment.
Suitable measures are:
• Use of fully de-mineralized fill water with a Conductivity of ≤ 10
microsiemens / cm.
To prevent oxygen from entering the heating water, the expansion vessel
must be adequately dimensioned.
When installing diffusion open pipes, a system separation with the help
of a heat exchanger is required.
Water quality
Hardness <3 °dH
Oxygen content <1 mg/l
Carbon dioxide, CO2<1 mg/l
Chloride ions, CL-<250 mg/l
Sulphate, SO4<100 mg/l
Conductivity <350 μS/cm
pH 7,5 – 9
1) Only applicable in the United Kingdom.
ADEY 01242 546700
www.adey.com
FERNOX 0330 100 7750
www.fernox.com
SENTINEL 01928 704330
www.sentinelprotects.com/uk
Heat pump
output [kW]
Total alkalinity
/totalhardness
of the filling
water [°dh]
Maximum fill and top-up water
volume Vmax [m3]
Q< 50 Requirements
according to
figure 1
Requirements according to
figure 1
0,00
0,20
0,40
0,60
0,80
1,00
1,20
1,40
1,60
1,80
2,00
2,20
2,40
2,60
0 5 10 15
0010036248-002
V [m
3
]
H
W
[°dH]
A
B

Product description
5
AWE – 6721835317 (2021/09)
3 Product description
3.1 Supplied parts
Fig. 2 Supplied parts
[1] Indoor unit
[2] Documentation
[3] Drill template
[4] Cable feeds
[5] Particle filter with strainer
[6] Jumpers for 1-phase installation (not used in Sweden)
[7] Mounting rail
[8] Flow temperature sensor
[9] Box with terminals for the installation module
[10] DHW temperature sensor
[11] Bag with screws
[12] Outdoor sensor
3.2 Information on the indoor unit
The indoor units AWE are intended for assembly in a house and for
connection to Compress 7001i AW/Compress 7400i AW heat pumps
installed outdoors.
Possible combinations:
Table 5 Possible combinations
3.3 Declaration of conformity
The design and operating characteristics of this product comply with the
European and national requirements.
The CE marking declares that the product complies with all the
applicable EU legislation, which is stipulated by attaching this
marking.
The complete text of the Declaration of Conformity is available on the
Internet: worcester-bosch.co.uk.
1
2
3
4
5
6
12
11
10
7
8
9
AWE Compress 7001i AW/Compress
7400i AW
5-9 5
5-9 7
5-9 9
13-17 13
13-17 17

Product description
AWE – 6721835317 (2021/09)
6
3.4 Type plate
The data plate of the indoor unit is on the control device behind the
cover. It contains information on the part number and serial number and
also the date of manufacture of the device.
3.5 Product overview
Fig. 3 Components and pipework connections of the indoor unit with
auxiliary heater
[1] Installation circuit board
[2] Resetting the overheating protection
[3] Heating pump (heat transfer medium)
[4] Electrical heater
[5] Automatic air vent valve (VL1)
[6] Cable feed for power input
[7] Cable feed for sensor CAN-BUS and EMS-BUS
[8] Heat transfer medium inlet (primary) from the heat pump
[9] Heat transfer medium outlet (primary) to the heat pump
[10] Flow to heating system
[11] Pressure gauge
[12] Overpressure discharge from the pressure relief valve
[13] Return from the heating system
3.6 Product dimensions and minimum clearances
Mount the indoor unit high enough so that the control unit is easy to use.
In addition, take into account pipes and connections under the indoor
unit.
Fig. 4 Minimum distance (mm)
1
2
3
4
5
10
11
13
12
7
6
98
800
50 50
550

Preparing for installation
7
AWE – 6721835317 (2021/09)
Fig. 5 Dimensions and connections
4 Preparing for installation
The particle filter is installed horizontally in the return of the heating
system. Note the direction of flow of the filter.
The drain pipe of the pressure relief valve in the indoor unit must be
installed so that it is protected against frost, and the drain pipe must be
routed to the drain.
▶ Run the connector pipes for the heating system and cold/domestic
hot water in the building up to the installation location of the indoor
unit.
4.1 Assembly of the indoor unit
• The indoor unit is placed in the building. The pipework between the
heat pump and indoor unit must be as short as possible. Use
insulated pipes.
• The installation location for the indoor unit must have a drain.
4.2 Minimum volume and execution of the heating
system
To safeguard the heat pump function and avoid an excessive number of
start/stop cycles, incomplete defrosting and unnecessary alarms, it
must be possible to store a sufficient amount of energy in the system.
This energy is stored in the water volume of the heating system, and also
in the components of the system (radiators) and concrete floor
(underfloor heating system).
As the requirements for different heat pump installations and heating
systems vary considerably, a minimum water volume in litres is generally
not specified. Instead, the system volume is considered to be sufficient
if certain conditions are met.
Underfloor heating system without buffer cylinder
A room temperature-dependent control unit should be installed in the
largest room (reference room) instead of room thermostats. Small floor
areas can lead to the auxiliary heater being activated in the final phase of
the defrosting process.
• ≥6m
2floor area required for heat pump 5 – 9.
• ≥ 22 m2floor area required for heat pump 13 – 17.
To ensure maximum energy savings andavoidauxiliary heateroperation,
the following configuration is recommended:
• ≥ 30 m2floor area for heat pump 5 – 9.
• ≥ 100 m2floor area for heat pump 13 – 17.
System with radiators without mixer and buffer cylinder
If the system only contains a few radiators, the auxiliary heater may be
activated in the final phase of the defrosting process. The radiator
thermostats must be opened fully.
• ≥ 1 radiator with 500 W rating required for heat pump 5 – 9.
• ≥ 4 radiators each with roughly 500 W rating required for heat pump
13 – 17.
To ensure maximum energy savings andavoidauxiliary heateroperation,
the following configuration is recommended:
• ≥ 4 radiators with 500 W rating for heat pump 5 – 9.
Heating system with underfloor heating system and radiators in
separate heating circuits without buffer cylinders
A room temperature-dependent control unit should be installed in the
largest room (reference room) instead of room thermostats. Small floor
areas or only a few radiators in the system can lead to the auxiliary heater
being activated in the final phase of the defrosting process.
• ≥ 1 radiator with 500 W rating required for heat pump 5 – 9.
• ≥ 4 radiators each with roughly 500 W rating required for heat pump
13 – 17.
Although a minimum floor area is not required for the underfloor heating
circuit, to avoid auxiliary heater operation and achieve optimum energy
savings, additional heating thermostats or several valves of the
underfloor heating system must be at least partially open.
Only heating circuits with mixer
A buffer cylinder is essential in heating systems consisting only of
heating circuits with mixer.
• Required volume for heat pump 5 – 9 = ≥ 50 litres.
• Required volume for heat pump 13 – 17 = ≥ 100 litres.
Only fan convectors
To prevent the auxiliary heater from being activated in the final phase of
the defrosting process, a buffer storage tank with a capacity of ≥ 10 l is
required.
Cooling mode
If cooling mode is activated and run in combination with fan coils it is
recommended toadd a buffer cylinder ≥ 100 litres in the system for best
performance and comfort.
159
204
204
43
73
109
110
59
386
485

Installation
AWE – 6721835317 (2021/09)
8
5 Installation
5.1 Transport and storage
The indoor unit must always be transported and stored in an upright
position. If needed, it may be leaned temporarily.
The indoor unit may not be stored or transported at temperatures below
– 10 °C.
5.2 Unpacking
▶ Remove the packaging according to the instructions on the
packaging.
▶ Take out enclosed accessories.
▶ Check that all package contents are present.
5.3 Checklist
Each installation is different. The following checklist contains a general
description of the recommended installation steps.
1. Fit the drain hose of the indoor unit.
2. Connect the indoor unit to the heat pump.
3. Install the particle filter according to the system solution.
4. Connect the indoor unit to the heating system.
5. Install the outdoor temperature sensor and, if necessary, the room
temperature-dependent controller.
6. Connect CAN-BUS cable to heat pump and indoor unit.
7. Install any accessories (solar module, pool module, etc.).
8. If required, connect EMS-BUS cable to accessories.
9. If present, fill and vent the DHW cylinder.
10. Fill and vent the heating system.
11.Establish the electrical connection of the system.
12.Bring the heating system into operation. Use the control unit to make
the necessary settings (instructions for control unit).
13.Vent entire heating system following commissioning.
14.Make sure that all sensors are displaying permissible values.
15.Check and clean filters.
16.Check the operation of the heating system after startup
(instructions for the control unit).

Installation
9
AWE – 6721835317 (2021/09)
5.4 Connection
5.4.1 Connecting the indoor unit to the heat pump and the
heating system
NOTICE
Residue in the pipework can damage the system.
Solids, metal/plastic filings, flux and thread tape residue and similar
material can get stuck in pumps, valves and heat exchangers.
▶ Keep foreign bodies from entering the pipework.
▶ Do not leave pipe parts and connections directly on the ground.
▶ When deburring, make sure that no residue remains in the pipe.
▶ Before connecting the heat pump and indoor unit, rinse the pipe
system to remove any foreign bodies.
NOTICE
Material damage from frost!
In case of a power outage the water in the pipes may freeze.
▶ Use insulation with a thickness of at least 19 mm for pipework
outdoors.
▶ In buildings, use insulation with a thickness of at least 12 mm for
pipework. This is also important for safe and efficient DHW mode.
All heat-conducting pipework must be provided with suitable thermal
insulation according to applicable regulations.
Incoolingmode,allconnectionsandlinesmustbeinsulated accordingto
applicable standards to prevent condensation.
▶ Route a leakage water hose downwards to a frost-free drain.
▶ Size pipework as specified in the installation instructions for the heat
pump.
▶ Connect the piping from the heat pump to the heat transfer medium
inlet.
▶ Connect the piping to the heat pump at the heat transfer medium
outlet.
▶ Connect the return from the heating system.
▶ Connect the flow to the heating system.
Fig. 6 Connection of the indoor unit with electric booster heater to the heat pump and heating system
[1] Heat transfer medium inlet (primary) from the heat pump
[2] Heat transfer medium outlet (primary) to the heat pump
[3] Flow from the heat pump
[4] Return to the heat pump
[5] Flow to the heating system
[6] Overpressure discharge from the pressure relief valve
[7] Return from the heating system
[8] Particle filter
T T
<50V 230V
/
400V
67
51
8
2
3
4

Installation
AWE – 6721835317 (2021/09)
10
5.4.2 Outdoor unit, indoor unit and heating system filling
NOTICE
The system will be damaged if it is turned on without water.
The system may be damaged if it is turned on without water.
▶ Fill the DHW cylinder and heating system before turning on the
heating system, and establish the correct pressure.
Vent also at other ventilation punts in the heating system, e.g. radiators.
Fill preferably to a higher pressure than the final one so that there is a
margin when the temperature of the heating system rises and the air that
has been dissolved in the water is vented out via VL1.
Fig. 7 Indoor unit and heating system
[Z1] Heating system (without mixing valve)
[1] Heat pump
[2] Manual purge valve
1. Disconnect the power supply to the heat pump and indoor unit.
2. Close the heating system valves; particle filter SC1 and VC3.
3. Connect a hose to VA0 and route the other end to a drain. Open the
drain valve VA0.
4. Open the fill valve VW2 and admit water into the pipes leading to the
heat pump.
5. Open the manual air vent until water flows without air and close the
vent again.
6. Continue filling until only water comes out of the hose by the drain
and the outdoor unit's condenser does not form bubbles any more.
7. Close the drain valve VA0 and the fill valve VW2.
8. Move the hose to the heating system drain valve VC2.
9. Open the valve VC3, the drain valve VC2 and the fill valve VW2 to fill
the heating system.
10.Continue filling until only water comes out of the hose by the drain
and the heating system does not form bubbles.
11.Close the drain valve VC2.
12.Open the particle filter SC1 and keep filling until the pressure gauge
GC1 shows 2 bar.
13.Close the fill valve VW2.
14.Remove the hose from VC2.
T
T
Z1
VC1 VC2
PC1
SC1
GC1
VA0
VL1
VW2
PC0
VC3
1
2

Installation
11
AWE – 6721835317 (2021/09)
5.4.3 Heating circuit pump (PC1)
Depending on the configuration of the heating system, a pump is needed
that is selected depending on the flow rate and pressure drop
requirements.
The pump PC1 must always be connected to the installation module of
the indoor unit according to the wiring diagram.
Maximum load at the relay output of the pump PC1: 2A, cos>0.4.If
the load is higher, install an intermediate relay.
5.4.4 Electrical connection
NOTICE
Malfunction due to faults!
High-voltage lines (230/400 V) in the vicinity of communication lines
can cause the heat pump to malfunction.
▶ Route sensor cable, EMS-BUS cable and shielded CAN-BUS cable
separately to power cables. Maintain a minimum distance of
100 mm. The BUS cable can be routed together with sensor cables.
EMS-BUS and CAN-BUS are not compatible.
▶ Do not connect EMS-BUS units to CAN-BUS units.
It must be possible to safely interrupt the power supply to the device.
▶ Install a separate safety switch that completely de-energizes the
indoor unit. When the power supply is separate, a separate safety
switch is needed for each supply line.
▶ Select the appropriate conductor cross-sections and cable types for
the respective fuse protection and routing method.
▶ Mount the enclosed terminals on the installation PCB.
▶ Connect the unit according to the wiring diagram. No additional
consumers may be connected.
▶ When changing the PCB, note the colour coding.
Whenextendingtemperaturesensor cables,use thefollowingconductor
diameters:
• up to 20 m long cable: 0.75 to 1.50 mm2
• up to 30 m long cable: 1.0 to 1.50 mm2
CAN-BUS
NOTICE
The system will be damaged if the 12 V- and the CAN-BUS
connections are incorrectly connected!
The communication circuits are not designed for 12 V constant voltage.
▶ Check to ensure that the cables are connected to the contacts with
the corresponding markings on the modules.
Accessories such as output limiters to be connected to the CAN-BUS are
connected in parallel on the installation module card in the indoor unit to
the CAN-BUS connection for the heat pump. Accessories can also be
connected in series with other units connected to the CAN-BUS.
The heat pump and indoor unit are connected to each other by a
communication line, the CAN-BUS.
A LIYCY cable (TP) 2 x 2 x 0.75 (or equivalent) is suitable as an
extension cable outside of the unit. Alternatively, twisted pair cables
approved for outdoor use with a minimum cross-section of 0.75 mm2
can be used. In doing so, only earth the shielding on one side (indoor
unit) and to the casing.
The maximum permissible cable length is 30 m.
The connection is made with four wires, as the 12 V supply is also
connected. The 12 V and CAN-BUS connections are marked on the
module.
The"Term" changeover switch identifiesthe start and end of CAN-BUS
loops. Ensure that the correct modules are terminated and that all other
modules are not terminated.
Fig. 8 Termination CAN-BUS
On CAN-BUS completed
Off CAN-BUS not completed
Installation of the temperature sensor
In the default setting, the controller automatically regulates the flow
temperature depending on the outside temperature. A room
temperature-dependent controller can be installed for greater comfort.
Flow temperature sensor T0
Sensor is included in the delivery.
▶ Installthe sensor 1-2 metresbehindthe divertervalveorat the buffer
cylinder or at the low loss header if present.
▶ Connect the flow temperature sensor on the installation module in
the control device of the indoor unit to terminal T0.
Outdoor temperature sensor T1
A screened cable must be used if the outdoor temperature sensor cable
is longer than 15 m. The screened cable must be earthed to the indoor
unit. The max. length of a screened cable is 50 m.
The cable to the outdoor temperature sensor must meet the following
minimum requirements:
• Cable diameter: 0.5 mm2
• Resistance: max. 50 /km
• Number conductors: 2
6 720 809 156-24.1I

Installation
AWE – 6721835317 (2021/09)
12
▶ Install the sensor on the coldest side of the house, normally facing
north. The sensor must be protected against direct sunlight, air vents
or other factors which could affect the temperature measurement.
The sensor must not be installed directly under the roof.
▶ Connect the outdoor temperaturesensor T1 to the terminal T1 onthe
installer module.
Fig. 9 Position of the outdoor temperature sensor
External inputs
NOTICE
Damage due to incorrect connection!
Connections intended for a different voltage or current can damage
electrical components.
▶ Only perform connections to the heat pump's external inputs which
are designed for 5 V and 1 mA.
▶ If an intermediate relay is required, use only relays with gold-plated
terminals.
The external inputs can be used for the remote control of certain
functions in the user interface.
Those functions which are activated by the external inputs are described
in the operating manual for the user interface.
The external inputs are connected either to a circuit breaker for manual
activation or a control device with a relay output for 5 V.
Connect the indoor unit
▶ Remove the lock of the control device.
▶ Feed the connecting lead through the cable feeds to the control
device.
▶ Connect cable as shown in the wiring diagram.
▶ Reattach the cover of the control device and the front plate of the
indoor unit.
Fig. 10 Cable feeds
[1] Cable feed for sensor, CAN-BUS and EMS-BUS
[2] Cable feed for electrical connection
Considerations for three phase and single phase connections
NOTICE
Risk of product malfunction!
The fuse size should be appropriate to the selected setting for power
output of the electric booster heater (table 6).
▶ If the indoor unit is connected with a single phase connection, fuse
sizes up to 50A are required.
▶ Always ensure that the selected power limitation fits the available
fuse size and cable cross-section during commissioning and
servicing.
Fuse sizes for three phase and single phase connections:
Table 6 Required fuse sizes
The maximum power consumption of the electric heater can be limited
via the control unit. A stepwise limitation of 2/4/6/9kW (stand-alone
operation) and 2/4/6kW (during compressor operation) can be
selected. Depending on this setting, the required fuse size can be
reduced to the values shown in table 6. The correct setting for the
available fuse sizes must be ensured.
Comfort reduction may occur if the power output of the electric heater is
reduced.
1/2H(min 2m)
H
N
S
WE
NW NE
SW SE
6 720 809 156-23.1I Limitation of electric
heater
Required fuse size
for 3-phase
Required fuse size
for 1-phase
2kW 10A 16A
4kW 10A 25A
6kW 25A 32A
9kW 25A 50A
1
2

Installation
13
AWE – 6721835317 (2021/09)
Standard: Electrical connection for integrated auxiliary heater
(factory configuration)
Fig. 11 Electrical standard connection for the integrated electric
booster heater
[1] 400 V (three-phase current) mains voltage for indoor unit
[2] 230 V (alternating current) mains voltage for heat pump
(alternating current)
[3] 230 V ~1 N mains voltage for accessories
Table 7 Power steps of the electric booster heater
K3 is blocked during compressor mode. When only the electric booster
heater is running and the compressor is switched off, the following
power steps apply: 3/6/9 kW.
Alternative version, alternating current, see arrangement of
jumpers
The heat pump has a separate power supply and is connected via the
building connection.
Fig. 12 Alternative version
[1] 230 V 1 N~, mains voltage
[2] 230 V 1 N~, EMS accessory
Capacity K1 K2 K3
2000 W X
4000 W X
6000 W X X
9000 W X X X
3
2
1
1 2
0010025729-001

Installation
AWE – 6721835317 (2021/09)
14
Connections to installation module
Fig. 13 Connections to installation module
[I1] External input 1 (energy supplier)
[I2] External input 2
[I3] External input 3
[I4] External input 4 (control unit)
[MD1]Humidity sensor (accessory for cooling mode)
[T0] Flow temperature sensor
[T1] Outdoor sensor
[PC1] Circulation pump, heating circuit
[VW1]Heating / DHW diverter valve (accessory)
[PK2] Relay output for cooling season, 230 V
[VC0] Circulation diverter valve, 230 V output (accessory)
[PW2]DHW circulation pump (accessory, required for cooling
operation)
[1] CAN-BUS to heat pump (I/O PCB)
[2] Alarm buzzer (accessory)
2
PK2
VC0
PW2
VW1
PC1

Installation
15
AWE – 6721835317 (2021/09)
Connection alternative for EMS bus
Fig. 14 Connection alternative for EMS bus
[A] Star configuration and connection inseries with external junction
box
[B] Star configuration
[C] Serial connection
[1] Installation circuit board
[2] Accessory modules (room temperature-dependent controller,
heating circuit module and solar module)
B CA
111
222
222
222
222

Commissioning
AWE – 6721835317 (2021/09)
16
6 Commissioning
6.1 Venting the outdoor unit, indoor unit and heating
system
NOTICE
If the system is not correctly ventilated, this will damage the indoor
unit!
The auxiliary heater may overheat or be damaged if it has not been fully
vented prior to activation.
▶ Carefully vent the system when filling.
▶ Carefully vent the system once again during commissioning.
Also vent heating system at other venting points (e.g. radiators).
Always set the pressure slightly higher than the reference pressure as
this ensuresa degree of tolerance to allow the air dissolved in the heating
water to be vented via VL1 as the temperature rises.
Fig. 15 Indoor unit with an integrated electric booster heater and heating system
[Z1] Heating system (without mixer)
[1] Heat pump
[2] Manual air vent valve
1. Connect the power supply of the outdoor and indoor unit.
2. Activateonlytheelectricboosterheaterand makesurethatthepump
PC1 is running.
3. Pull PWM contact PC0 off the pump PC0 so that it runs at maximum
speed.
4. Only deactivate the auxiliary heater when the pressure has not
decreased for 10 minutes and no more air emerges from the manual
air vent valve.
5. Connect the contacts PC0 to the pump.
6. Clean the particle filter SC1.
7. Check the pressure at the pressure gauge GC1, if the pressure is less
than 2 bar top up via the VW2 fill valve.
8. Check that the heat pump is running and that there are no alarms.
9. Vent the systemat the otherair vent valvesofthe heatingsystem(e.g.
radiator) as well.
T
T
Z1
VC1 VC2
PC1
SC1
GC1
VA0
VL1
VW2
PC0
VC3
1
2

Commissioning
17
AWE – 6721835317 (2021/09)
6.2 Adjusting the operating pressure of the heating
system
Table 8 Operating pressure
▶ Top up to 1.5–2.0 bar unless otherwise specified.
▶ If the pressure does not remain constant, check whether the heating
system has any leaks and if the capacity of the expansion vessel for
the heating system is sufficient.
6.3 Operation without heat pump (individual operation)
The indoor unit can be put into operation without a connected heat
pump, for example, if the heat pump is installed at a later date. This is
termed individual operation or stand-alone operation.
In individual operation, the indoor unit only uses the auxiliary heater for
heating and DHW heating.
If the indoor unit and the heating system are to be filled before the heat
pump is connected, connect the inlet and outlet of the heat transfer
medium to/from the heat pump to ensure circulation.
▶ Open any shut-off valves that are installed in the heat transfer
medium circuit.
Commissioning in individual operation:
▶IntheHeat pump service menu, select the option Operation
without heat pump (control unit manual).
6.4 Function test
The compressor is preheated before starting. This can take up to
2 hours, depending on the outdoor temperature. The prerequisite for
starting is that the value recorded by the temperature sensor of the
compressor (TR1) is 10 K higher than the temperature sensor at the
supply air terminal device (TL2). The temperatures are displayed in the
diagnosis menu of the control unit.
▶ Test active components of the system.
▶ Check whether the start condition for the heat pump has been
satisfied.
▶ Check if there is a heating or hot water demand.
-or-
▶ Draw off DHW or increase the heating curve to generate demand (
instructions for control unit).
▶ Check whether the heat pump starts.
▶ Make sure that no alarms are currently active.
-or-
▶Troubleshooting.
▶ Check the operating temperatures (instructions for the control
unit).
6.4.1 Pressure switch and overheating protection
The pressure switch and overheating protection are connected in series.
Alarms or information triggered at the control unit indicate either that
the operating pressure is too low, or that the temperature of the electric
booster heater is too high.
NOTICE
Material damage from running dry!
When the heating pump PC0 is operated for a long time when the
operating pressure is too low, it can be damaged.
▶ Eliminate any leaks in the system that are indicated when the
pressure switch is triggered.
The triggering of the pressure switch only blocks the electric booster
heater. The heating pump PC0 and the heat pump can continue to run if
there is a risk of frost.
Pressure switch
Theindoorunit has apressure switch whichtriggersoncethe pressurein
the heating system falls below 0.5 bar. Once the pressure exceeds
0.5 bar, the pressure switch is automatically reset.
▶ Make sure that the expansion vessel and pressure relief valve are
configured for the indicated operating pressure.
▶ Check for any leaks.
▶ Slowly increase the pressure in the heating system by adding water
through the fill valve.
Overheating protection (OHP)
The overheating protection triggers when the temperature of the electric
booster heater rises above 95 °C.
▶ Make sure that the particle filter is not blocked and that the flow
through the heat pump and heating system is unimpeded.
▶ Check the operating pressure.
▶ Check the heating and DHW settings.
▶ Reset the overheating protection. To do this, press the button on the
bottom of the terminal box.
6.4.2 Operating temperatures
The operating temperature check must be performed in heating mode
(not in DHW or cooling mode).
For optimum system operation, the flow rate in the heat pump and
heating system must be monitored. This check should be performed
after 10 minutes heat pump operating time and during high compressor
heating output.
The temperature differential for the heat pump must be set for the
different heating systems.
▶ With underfloor heating system: set a temperature difference of 5 K.
▶ With radiators: set a temperature difference of 8 K.
These settings are optimal for the heat pump.
Check the temperature differential at high compressor heating output:
▶ Open the diagnosis menu.
▶ Select Monitored values.
▶ Select Heat pump.
▶ Select Temperatures.
▶ Readtheprimary flowtemperature(heat transfer mediumoff, sensor
TC3) and return temperature (heat transfer medium on, sensor TC0)
in heating mode. The flow temperature must be higher than the
return temperature.
Display on the pressure gauge
1 bar Minimum charge pressure. When the system is cold, the
operating pressure must be kept at roughly 0.2–0.5 bar
above the pre-charge pressure of the nitrogen cushion in
the expansion vessel. The pre-charge pressure is 0.7–
1.0 bar as a rule.
3bar Maximum charging pressure at maximum heating water
temperature: must not be exceeded (the pressure relief
valve will open).

Operation
AWE – 6721835317 (2021/09)
18
▶ Calculate the difference TC3–TC0.
▶ Check whether the difference corresponds to the delta value set for
heating mode.
If the temperature differential is too large:
▶ Vent the heating system.
▶ Clean filters / strainers.
▶ Check pipe dimensions.
Temperature differential in the heating system
▶ Set the output at the heating pump PC1 so that the following
difference is achieved:
▶ With underfloor heating system: 5 K.
▶ With radiators: 8 K.
7Operation
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.
8 Maintenance
DANGER
Electrical shock!
▶ Before working on the electrics, the main power supply must be
switched off.
DANGER
Risk of electric shock!
Opening the installer module may cause injury by electric shock.
▶ Do not open the installer module to replace a component. If the
installer board or one of its components need to be replaced, remove
the installer module completely and replace by a new one.
NOTICE
Deformation due to heat!
If the temperature is too high, the insulation (EPP) in the indoor unit
deforms.
▶ When carrying out brazing work in the heat pump, protect the
insulation with a heat resistant cloth or damp cloth.
▶ Only use original spare parts!
▶ Refer to the spare parts list when ordering spare parts.
▶Replaceremovedgasketsand O-rings with new ones.
The tasks described below must be carried out during an inspection.
Display activated alarm
▶ Check the alarm log (instructions for the control device).
Function test
▶ Carry out function check (Chap. 6.4).
8.1 Particle filter
The filter prevents particles and contamination from entering the heat
pump. Over time, the filter can become blocked and must be cleaned.
To clean the filter, the system does not need to be emptied. The filter and
shut-off valve are integrated.
Cleaning the strainer
▶ Close the valve (1).
▶ Unscrew the cap (manually) (2).
▶ Take out the strainer and clean it by running water over it or by
pressure cleaning.
▶ Reinstall the strainer. For proper assembly, make sure that the guide
bumps fit into the recesses in the valve.
Fig. 16 Cleaning the strainer
▶ Screw the cap back on (tighten handtight).
▶ Open the valve (4).
Check the magnetite indicator
After installation and startup the magnetite indicator must be checked at
more frequent intervals. If a lot of magnetic dirt is clinging to the
magnetic bar in the particulate filter and that dirt frequently causes an
alarm related to the poor flow (e.g., low or poor flow, high flow supply or
HP alarm) an approved magnetite filter must be installed to avoid regular
draining of the indicator. The magnetic filter must be installed in addition
to the mesh filter and be placed in the secondary circuit after the
hydraulic separation. A filter also increases the longevity of components
in the heat pump as well as the remaining parts of the heating system.
When installing a magnetic filter, consideration should be made for the
product specific impact on the pressure drop on the system.
8.2 Replacing components
If you intend to replace a component and the indoor unit needs to be
emptied and refilled to do this, carry out the following steps:
1. De-energise the heat pump and indoor unit.
2. Make sure that that automatic air vent valve VL1 is open.
3. Close the valves to the heating system; particle filter SC1 and VC3.
4. Connect a hose to the drain valve VA0 and route the other end to a
drain. Open the valve.
5. Wait until no more water flows into the drain.
6. Replace components.
1.
2.
2.
1.
12
34
6 720 805 915-01.1I

Installation of accessories
19
AWE – 6721835317 (2021/09)
7. Open the fill valve VW2 and admit water into the pipe leading to the
heat pump.
8. Continue filling until only water emerges from the hose at the drain
and the outdoor unit no longer contains air bubbles.
9. Close the drain valve VA0 and continue filling the system until the
reading at the pressure gauge GC1 is 2 bar.
10.Close the fill valve VW2.
11.Connect the power supply to the heat pump and indoor unit.
12.Remove the hose from the drain valve VC0.
13.Clean the particle filter SC1.
14.Close the valves VC3 and SC1 to the heating system.
15.Check the pressure after a while and add more via the fill valve VW2
if the pressure is below the required pressure.
9 Installation of accessories
9.1 EMS-BUS for accessories
The following applies to accessoriesthat are connected to the EMS-BUS
(see also the installation instructions for the respective accessories):
▶ IfseveralBUSunitsareinstalled,theremustbeaminimumspacingof
100 mm between them.
▶ If several BUS units are installed, connect them in series or in a star
configuration.
▶ Use cable with a minimum cross-section of 0.5 mm2.
▶ In case of external inductive interferences (e.g. from PV systems),
use screened cables. Only earth the shielding to the casing on one
side.
▶ Connect the cable on the installation module to terminal EMS-BUS.
If a component is already connected to the EMS terminal, establish the
connection in parallel to the same terminal according to fig. 17.
Fig. 17 EMS connection on the installer module
9.2 External connections
Max. load at the relay outputs: 2 A, cos If the load is higher, it is
necessary to install an intermediate relay.
• Output VC0 switches when changing over between heating and DHW
mode and is used if a buffer storage tank is installed.
• Relay output PK2 is active in cooling mode. Possible application
areas:
– Changing between cooling/heating for fan convectors. The
control device of the fan convector must feature the relevant
function.
– Pump control in a separate circuit which is exclusively intended
for cooling mode.
– Control of underfloor heating circuits in damp areas.
– If the setting "Switch off PC1 in DHW mode" has been set to "No",
PK2 also switches when defrosting. This function serves as a
backdraught shutter for fan convectors.
9.3 Maximum sensor
In some countries a high limit safety cut-out is required in underfloor
heating circuits. The high limit safety cut-out is connected to the
installation module at the external input 1–3 (Fig. 34). Adjusting the
function for the external input (instructions for control device).
9.4 Installation of the domestic hot water cylinder
If the domestic hot water cylinder is installed lower than the heat pump
(e.g. in the cellar), a natural circulation can occur that leads to heat loss
in the cylinder.
▶ Install a non-return valve in the circuit to prevent natural circulation if
the installation height of the domestic hot water cylinder is below the
heat pump.
Fig. 18 Hot water cylinder
[1] Non-return component
The connection instructions are in the cylinder documentation.
EMS NSC/IP
0010012105-002
CW1
TW1
1

Installation of accessories
AWE – 6721835317 (2021/09)
20
When using a DHW cylinder (circuit flow cylinder) in the heating system,
an automatic air vent valve must be mounted on the cylinder. This also
applies to twin wall cylinders.
When using a circuit flow cylinder in the heating system, an automatic air
vent valve must be installed at the inlet to the cylinder with a micro-
bubble separator.
9.5 DHW cylinder temperature sensor TW1
When a DHW cylinder is connected and TW1 is connected to the system,
this is automatically actuated upon starting.
▶ Connect the hot water temperature sensor TW1 on the installation
module in the control device to terminal TW1.
9.6 Diverter valve VW1
System solutions with a domestic hot water cylinder require a diverter
valve (VW1). Connect the diverter valve VW1 on the installation module
in the indoor unit to terminal VW1.
Fig. 19
[A] To the domestic hot water cylinder
[B] To the heating system (or buffer cylinder)
[AB] From the indoor unit
Fig. 20 Contact closed, connection A open
During domestic hot water heating, the contact is closed and connection
A is open.
Fig. 21 Contact open, connection B open
In heating mode, the contact is opened and connection B is open.
If the 3-way diverter valve has a Molex plug, only terminals 2, 3 and 6 are
assigned.
Make the following connections on the installation module:
▶N– Connection to terminal N, VW1 on the installation module
▶Y– Connection to terminal 53, VW1 on the installation module
▶L– Connection to terminal 54, VW1 on the installation module
Fig. 22 Molex plug
If the 3-way diverter valve has a cabled connection, make the following
connections on the installation module:
▶N– Connection to terminal N, VW1 on the installation module
▶Y– Connection to terminal 53, VW1 on the installation module
▶L– Connection to terminal 54, VW1 on the installation module
Fig. 23 Cabled connection
9.7 Domestic hot water cylinder, solar thermal heating
A domestic hot water cylinder for solar thermal heating is available as an
accessory. Installation and handling instructions are supplied with the
domestic hot water cylinder.
001002031-002
2
6
3
L
N
Y
L
Y
Black
Blue
Brown
0010041016-001
N