Bosch Compress 7400i AW 5 OR Assembly instructions

6721840487 (2021/10) IE
Installer Guide
Air to water heat pump
Compress 7400i AW
5 OR | 7 OR

Table of contents
Compress 7400i AW – 6721840487 (2021/10)
2
Table of contents 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 canbe 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 norisk to
people or property.
Additional symbols
Table 1
1.2 General safety instructions
These installation instructions are intended for plumbers, heating
system installers and electricians.
▶ Read all installation instructions (heat pump, control system etc)
carefully before installation.
▶ Follow safety and warning instructions.
▶ Follow national and regional regulations, technical regulations and
guidelines.
▶ Document all work that has been performed.
HIntended operation
This heat pump is intended to be used in a closed
heating system for households. All other use is
considered unsuitable. Any damage that is caused by
such usage is excluded from liability.
HInstallation, commissioning and service
The heat pump may only be installed, brought into
operation and maintained by authorised personnel.
1 Explanation of symbols and safety instructions . . . . . . . . . . . 2
1.1 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . 2
2 Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2 Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . 5
3.3 Type plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.4 Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.5 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.5.1 Dimensions of heat pump models 5 OR, 7 OR . . . . . . . . 6
3.6 Clearances during setup . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Preparing for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Installation locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 For drainage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3 Minimum volume and execution of the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1.1 Transport fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.2 Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3 Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.4 Mounting method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.4.1 Assembly of the heat pump . . . . . . . . . . . . . . . . . . . . . . . 9
5.5 Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.5.1 Water connecting pipe. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.5.2 Connection of heat pump to the indoor unit. . . . . . . . . 10
5.5.3 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.6 Installing side panels and cover. . . . . . . . . . . . . . . . . . . 12
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Installation of accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1 Heating cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8 Environmental protection and disposal . . . . . . . . . . . . . . . . . 16
9 Technical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9.1 Specifications – heat pump (alternating current) . . . . 16
9.2 Operating range of heat pump without auxiliary
heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.3 Refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9.4 Wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.4.1 Wiring diagram for transformer, alternating
current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.4.2 Wiring diagram for transformer, 1-/3-phase . . . . . . . . 21
9.4.3 Measurements for temperature sensor . . . . . . . . . . . . 22
9.5 Information on refrigerant . . . . . . . . . . . . . . . . . . . . . . . 22
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
3
Compress 7400i AW – 6721840487 (2021/10)
▶ Use only original spare parts.
HElectrical work
Electrical work may only be performed by authorised
electrical installers.
Before commencing work:
▶ Disconnect mains voltage on all poles and ensure it
cannot reconnect.
▶ Check to ensure that the power is disconnected.
▶ Also check the connection diagram for other parts
of the system.
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:
– Alterations 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 notbe 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 properties in power grids for public distribution)
•EN 12828 (heating systems in buildings - Design and installation of
water-based heating systems)
•EN 1717 (Protection of potable water against pollution in potable
water installations)
•EN 378 (Refrigerating systems and heat pumps - Safety and
environmental requirements)
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 system separation 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!
Debrisfromthe systemcan damagethe applianceand reduceefficiency.
▶ 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.
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
ADEY 01242 546700
www.adey.com
FERNOX 0330 100 7750
www.fernox.com
SENTINEL 01928 704330
www.sentinelprotects.com/uk

Regulations
Compress 7400i AW – 6721840487 (2021/10)
4
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 above the limit curve in 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.
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
Compress 7400i AW – 6721840487 (2021/10)
3 Product description
3.1 Scope of delivery
Fig. 2 Scope of delivery
[1] Heat Pump
[2] Cover and side panels
[3] Tripod feet
3.2 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: www.bosch.ie.
3.3 Type plate
The data plate is located on the rear side of the heat pump. It contains
information on the output, part number and serial number and also the
date of manufacture. The product designation AirO S Hydro is also
specified on the data plate.
12
30010029636-001

Product description
Compress 7400i AW – 6721840487 (2021/10)
6
3.4 Product overview
Fig. 3 Product overview
[1] Electronic expansion valve VR1
[2] Electronic expansion valve VR0
[3] Four-way valve
[4] Pressure switch/pressure sensor
[5] compressor
[6] Inverter
Description applies for all sizes.
3.5 Dimensions
3.5.1 Dimensions of heat pump models 5 OR, 7 OR
Fig. 4 Dimensions and connections of heat pump models 5 OR-7 OR,
rear
Fig. 5 Dimensions of heat pump models 5 OR-7 OR, view from top
1
2
3
4
65
352
99
76
405
1380
836
593
583 478
510
ø10,5
934
0010031841-002

Preparing for installation
7
Compress 7400i AW – 6721840487 (2021/10)
3.6 Clearances during setup
Fig. 6 Clearances during setup
[*] The clearance can be reduced on one side.This may however lead
to a higher noise level.
[A] Installation clearances of heat pump.
4 Preparing for installation
4.1 Installation locations
▶ Place the heat pump outdoors on a flat stable surface.
▶ When setting up the heat pump, make sure it can be accessed at all
times in order to carry out maintenance work. If access is restricted,
e.g. due to installation on a roof, suitable measures must be taken to
ensure that maintenance work can still be carried out without
additional time expenditure or costly assembly aids.
▶ Bear in mind the sound propagation of the heat pump when placing
it, particularly in view of avoiding of noise nuisance to neighbours.
▶ Whenever possible, do not place the heat pump in front of rooms
sensitive to noise.
▶ Do not place the heat pump in a corner where it is flanked bywalls on
3 sides. This can increase the noise level and soiling of the
evaporator.
Fig. 7 Avoid setting up in locations surrounded by walls
▶ With a freestanding installation (not near the building):
– Do not install the heat pump so the intake side faces directly south
to avoid the effects of the sun on the air temperature sensor.
– Use a wall wall or similar object to protect the intake side.
Fig. 8 Free standing heat pump
▶ Whenever possible, set up the heat pump so that the front is not
directly facing the wind.
▶ Position the outdoor unit of the heat pump so that no snow or water
from the roof drips or slides onto it. If this cannot be avoided, a
protective roof must be installed.
If a protective roof is installed above the heat pump, bear in mind that it
must be possible to lift the thermal insulation material of the heat pump
up and off.
▶ Withthe models 5OR–7 OR,makesurethere is a clearanceof atleast
500 mm between the roof and heat pump.
▶ If the roof can be removed, the minimum clearance above the heat
pump for all models is 400 mm.
4.2 For drainage
Remove condensate via a frost-free drain of the heat pump, possibly
equipped with pipe trace heating. The drain must slope sufficiently to
prevent water from accumulating in the pipe.
The condensate can be routed to either a gravel bed, a stone box or into
a rainwater gully.
H 努1200 H 努1200
努2000
努400 努400
努2000 努2000
努 800) 努 500)
努2000
努2000 努2000
A

Installation
Compress 7400i AW – 6721840487 (2021/10)
8
Fig. 9 Condensate pipe in gravel bed
[1] Concrete foundations
[2] Shingle 300 mm
[3] Condensate tube 32 mm
[4] Gravel bed
4.3 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 inthe final phase of
the defrosting process.
• ≥6m
2floor area required for heat pump 5 OR – 7 OR.
To ensure maximum energy savings and avoidauxiliary heater operation,
the following configuration is recommended:
• ≥ 30 m2floor area for heat pump 5 OR – 7 OR.
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 OR – 7 OR.
To ensure maximum energy savings and avoidauxiliary heater operation,
the following configuration is recommended:
• ≥ 4 radiators with 500 W rating for heat pump 5 OR – 7 OR.
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 OR – 7 OR.
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 OR – 7 OR = ≥ 50 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.
5 Installation
NOTICE
Damage to the heat pump due to water!
Electrical connections and electronics can be damaged if they are
exposed to water. The outer casing is a prerequisite for meeting the heat
pump's IP rating.
▶ The heat pump must not be stored outdoors without its side panels,
front plate and roof.
▶ Mount side panels, front plate and roof without delay after all
connections are done.
5.1 Transport
The heat pump must always be transported and stored in an upright
position. It can be tilted provisionally, but not laid flat.
The heat pump must not be stored at temperatures below – 20 °C.
The heat pump can be carried by the belt handles.
2
4
3
1
900 mm

Installation
9
Compress 7400i AW – 6721840487 (2021/10)
5.1.1 Transport fitting
The heat pump is equipped with a transport fitting (screw) which is
clearly identified by a red marking. The transport fitting prevents the
heat pump from being damaged in transit. Unscrew transport fitting.
Fig. 10 Transport fitting
[1] Transport fitting
[2] Red marking
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 checklist below provides a general
description of the installation process.
1. Install and fix the heat pump on a solid surface.
2. Install condensate tube of the heat pump and possibly the pipe trace
heating.
3. Connect heat pump to the indoor unit.
4. Connect CAN-BUS cable to heat pump and indoor unit.
5. Connect power supply of the heat pump.
6. Mount side panels and cover of heat pump.
5.4 Mounting method
5.4.1 Assembly of the heat pump
CAUTION
Risk of trapping or injury!
The heat pump may tilt if it is not fixed correctly.
▶ Fix the heat pump to the floor.
NOTICE
Installation problems/faults if installed on sloping surface!
This will hamper the assembly of the side panels and cover.
The condensate drainage and functionality will be impaired.
▶ Make sure that the inclination of the heat pump in the horizontal and
vertical direction is no more than 1%.
▶ Screw the heat pump to the subsurface using suitable screws.
▶ Align the heat pump horizontally using the adjustable feet.
Fig. 11 Fastening the heat pump
[1] Adjustable feet
[2] 4 pieces M10 X120 mm (not included in scope of delivery)
[3] Level subsurface with sufficient load bearing capacity, e.g.
concrete foundations
5.5 Connection
5.5.1 Water connecting pipe
NOTICE
Damage due to risk of frost!
If the condensate freezes and cannot be routed away from the heat
pump, the evaporator may be damaged.
▶ Always install pipe trace heating if ice is likely to form in the
condensate hose.
Remove condensate via a frost-free drain of the heat pump, possibly
equipped with pipe trace heating. The drain must slope sufficiently to
prevent water from accumulating in the pipe.
The condensate can be routed to either a gravel bed, a stone box or into
a rainwater gully.
▶ Route 32 mm plastic pipe from the condensate connection to a drain.
▶ Connection of pipe trace heating Chapter 7.1.
1
2
1 2
1 2
3
3

Installation
Compress 7400i AW – 6721840487 (2021/10)
10
Fig. 12 Condensate tube connections, valid for all sizes
[1] Condensate line in rainwater gully
[2] Condensate line in gravel bed/stone box
[3] Connection for condensate tube
5.5.2 Connection of heat pump to the indoor unit
NOTICE
Material damage due to excessively high starting torque!
If connections are tightened too tightly, the heat exchanger may be
damaged.
▶ When installing the connection, the tightening torque should be no
more than 150 Nm.
Short pipe runs outdoors reduce heat losses. Use of pre-insulated pipes
is recommended.
▶ Use pipes in accordance with Chapter 7.1.
▶ Connect flow to the indoor unit at the heat transfer medium outlet of
the heat pump ([1], Fig. 13).
▶ Connect return from the indoor unit at the heat transfer medium inlet
of the heat pump ([2], Fig. 13).
▶ Tighten connections of the heat transfer medium pipes with a
starting torque of 120 Nm. Direct the force downwards (Fig. 13)
to avoid lateral loading of the condenser.
If the connection does not seal properly, the joint can be tightened
with a starting torque of up to 150 Nm. If the connection is still not
tight, this indicates that the gasket or connected pipe is damaged.
Fig. 13 Connections of heat carrying medium pipes, valid for all sizes
[1] Heat transfer medium outlet (to the indoor unit) DN25
[2] Heat transfer medium inlet (from the indoor unit) DN25
5.5.3 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.
It must be possible to safely interrupt the power supply to the device.
▶ If power is not supplied to the heat pump via the indoor unit, install a
separate safety switch that completely de-energizes it. 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.
▶ Connect the heat pump according to the wiring diagram. No
additional consumers may be connected.
▶ Ensure to install residual current device based on normative
requirements in each country.Werecommend to use residual current
device type B.
▶ When changing the PCB, note the colour coding.
CAN-BUS
NOTICE
The system will be damaged if the 12 V- and the CAN-BUS
connections are confused!
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 circuit board.
The heat pump and indoor unit are connected to each other by a
communication line, the CAN-BUS.
321
1
2

Installation
11
Compress 7400i AW – 6721840487 (2021/10)
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 PCB.
The"Term" changeover switch identifies the start andend ofCAN-BUS
loops. The I/O module board in the heat pump must be terminated.
Fig. 14 Termination CAN-BUS
Connecting the heat pump
A CAN-BUS signal cable with the minimum dimensions 4 x 0.75 mm2
and a maximum length of 30 m must be routed between the heat pump
and indoor unit.
▶ Release belt (Velcro fastener).
▶ Remove the lock of the control device.
▶ Feed the connecting lead through the cable conduits. Use tension
springs if required.
▶ Connect cable as shown in the wiring diagram.
▶ Tighten all cable fixings if required.
▶ Reattach the cover of the control device.
▶ Reattach the belt.
Fig. 15 Cable conduits and control device
[1] Cable conduit, power supply
[2] Cable conduit CAN-BUS
[3] Connection CAN-BUS
12
2
3

Installation
Compress 7400i AW – 6721840487 (2021/10)
12
5.6 Installing side panels and cover
CAUTION
Risk of injury!
There is a risk of hand injury if the fan is uncovered.
▶ The unit may not be commissioned without the front plate.
Fig. 16 Installing side panels and cover
1
2
1.
1. 2.
3.
2.
3.
1x
11x 21x 31x 41x 5
78910 6
0010029644-001
4x8x4x6x
11
6x 2x

Installation
13
Compress 7400i AW – 6721840487 (2021/10)
Fig. 17 Installing side panels and cover
3 4
9.
9.
5
8
4.
4.
6.
6.
6
7
8
9
5.
7.
8.
0010029645-001

Maintenance
Compress 7400i AW – 6721840487 (2021/10)
14
6 Maintenance
DANGER
Electrical shock!
The heat pump contains current-carrying components and the heat
pump capacitor must be discharged once the power supply has been
disconnected.
▶ Isolate the system from the supply.
▶ Wait at least five minutes before carrying out electrical work.
DANGER
Poisonous gas leakage!
The refrigerant circuit contains substances that can be transformed into
poisonous gas if they come into contact with air or open fire. Even in
small concentrations, these gases can cause respiratory failure.
▶ Leave the area immediately if the refrigerant circuit is leaking and
ventilate thoroughly.
NOTICE
Malfunction due to damage!
The electronic expansion valves are highly sensitive to impacts.
▶ Always protect the expansion valve from impacts and shock.
NOTICE
Deformation due to heat!
If the temperature is too high, the insulation material (EPP) in the heat
pump deforms.
▶ Remove as much insulation (EPP) as possible before carrying out
soldering work.
▶ When carrying out soldering work in the heat pump, protect the
insulation material with heat-resistant materials or a moist cloth.
Work on the refrigerant circuit must only be carried out by experts with
the relevant qualifications.
▶ Only use genuine spare parts!
▶ Refer to the spare parts list when ordering spare parts.
▶ Replace removed gaskets and O-rings with new ones.
The tasks described below must be carried out during an inspection.
Display activated alarm
▶ Check alarm log (controller manual).
Function test
▶ Perform function check (indoor unit installation instructions).
Install power cable
▶ Check the power cable for mechanical damage.
▶ Replace damaged cables.
7 Installation of accessories
7.1 Heating cable
A
B
C
1
2

Installation of accessories
15
Compress 7400i AW – 6721840487 (2021/10)
3
4
AA
5
C
A
6
A
7
C
A
A
NN
11
8
A
9
C
C
BB
10

Environmental protection and disposal
Compress 7400i AW – 6721840487 (2021/10)
16
8 Environmental protection and disposal
Environmental protection is one of the fundamental company policies of
the Bosch Group.
We regard quality of products, economy and environmental protection
as equal objectives. Environmental protection laws and regulations are
strictly adhered to.
To protect the environment, we use the best possible technology and
materials taking economic aspects into account.
Packaging
Where packaging is concerned, we participate in country-specific
recycling processes that ensure optimum recycling.
Allof our packagingmaterialsareenvironmentallycompatibleand can be
recycled.
Used appliances
Used appliances contain valuable materials that can be recycled.
Thevarious assembliescan beeasilydismantled. Synthetic materialsare
marked accordingly. Assemblies can therefore be sorted by composition
and passed on for recycling or disposal.
Old electrical and electronic appliances
This symbol means that the product must not be disposed
of with other waste, and instead must be taken to the waste
collection points for treatment, collection, recycling and
disposal.
The symbol is valid in countries where waste electrical and
electronic equipment regulations apply, e.g. "European Directive 2012/
19/EC on old electronic and electrical appliances". These regulations
define the framework for the return and recycling of old electronic
appliances that apply in each country.
As electronic devices may contain hazardous substances, it needs to be
recycled responsibly in order to minimize any potential harm to the
environment and human health. Furthermore, recycling of electronic
scrap helps preserve natural resources.
For additional information on the environmentally compatible disposal
of old electrical and electronic appliances, please contact the relevant
local authorities, your household waste disposal service or the retailer
where you purchased the product.
You can find more information here:
www.weee.bosch-thermotechnology.com/
9 Technical information
9.1 Specifications – heat pump (alternating current)
11
12
C
Unit 5 OR 7 OR
Air/water operation
Power output with A -10/W351) , 100% compressor speed kW 4.76 6.20
Power output with A -7/W351) , partial load kW 4.24 5.66
COP with A -7/W351) , partial load 3.02 3.08
Modulation range with A -7/W351) kW 1.5-5.0 1.9-6.8
Power output with A +2/W351), 100% compressor speed kW 5.48 7.29
Power output with A +2/W35 , partial load kW 2.53 2.54
COP with A +2/W35 , partial load 4.25 4.25
Modulation range with A +2/W35 kW 1.9-5.5 2.5-7.3
Power output with A +7/W351) , partial load kW 2.82 4.01
COP with A +7/W351) , partial load 5.01 5.01
Modulation range with A +7/W351) kW 2.1-7.6 4.0-7.9
Cooling capacity with A 35/W71) kW 4.44 5.66
EER with A 35/W71) 2.42 2.36
Cooling capacity with A 35/W181) kW 6.15 7.39
EER with A 35/W181) 2.98 2.86
Electrical details
Power supply 230 V 1N AC 50 Hz 230 V 1N AC 50 Hz
Protection index IP X4 IP X4
Fuse rating for supplying the heat pump directly via the building connection2) A 16 16
Maximum power consumption kW 3.2 3.6

Technical information
17
Compress 7400i AW – 6721840487 (2021/10)
Table 5 Specifications – heat pump (alternating current)
Table 6 Detailed sound pressure level, heat pump (alternating current)
Heat transfer medium
Minimum flow l/s 0.33 0.43
Internal pressure reduction kPa 7.8 10.5
Air and noise generation
Max. fan motor output (DC transformer) W 240 240
Maximum air current m³/h 3400 3400
Sound pressure level with a clearance of 1 m, load point according to 2013/811/EU dB(A) 42 42
Sound Power3) dB(A) 50 50
Max. sound power A7/W55 dB(A) 54 55
Max. sound power "quiet operation" A7/W55 dB(A) 49 51
Max. sound power A7/W35 dB(A) 55 55
Max. sound power "quiet operation" A7/W35 dB(A) 47 48
Max. sound power incl. tonality dB(A) 53 + 34) 55 + 34)
Max. sound power incl. tonality "quiet operation" dB(A) 49 + 04) 51 + 04)
General details
Refrigerant5) R410A R410A
Refrigerant charge kg 1.75 2.35
CO2(e) Tonne 3.65 4.91
Maximum temperature of flow, heat pump only °C 62 62
Installation altitude above sea level up to 2000 m above sea level
Dimensions (W x H x D) mm 940x1380x600 940x1380x600
Weight without walls and top cover kg 89 96
Weight with walls and top cover kg 113 120
1) Performance data in accordance with EN 14511
2) Fuse class gL/C
3) Sound power level in accordance with EN 12102
4) Tonality
5) GWP100 = 2088
Detailed sound pressure level (max.) 5 OR
Spacem123456810121416
Day Q=21)
1) No wall within a distance of 3m
dB (A) 48 42 38 36 34 32 30 28 26 25 24
Q=42)
2) Heat pump near the wall
dB(A)5145413937353331292827
Night Q=21) dB (A) 41 35 31 29 27 25 23 21 19 18 17
Q=42) dB(A)4438343230282624222120
Detailed sound pressure level (max.) 7 OR
Space m 1 2 3 4 5 6 8 10 12 14 16
Day Q=21) dB(A)5044403836343230282726
Q=42) dB (A) 53 47 43 41 39 37 35 33 31 30 29
Night Q=21) dB(A)4337333129272523212019
Q=42) dB (A) 46 40 36 34 32 30 28 26 24 23 22
Unit 5 OR 7 OR

Technical information
Compress 7400i AW – 6721840487 (2021/10)
18
9.2 Operating range of heat pump without auxiliary
heater
The heat pump switches off at approx. – 20 °C or +35 °C. The indoor
unit or an external heat source then take over the heating and DHW
heating. The heat pump restarts if the outdoor temperature exceeds
roughly – 17 °C or falls below +32 °C. In cooling mode the heat pump
switches off at roughly +45 °C and restarts at roughly +42 °C.
Fig. 18 Heat pump without auxiliary heater
[1] Maximum flow temperature (T0)
[2] Outdoor temperature (T1)
<3m
>3m
35
45
50
55
60
-30
T1[°C]
T0[°C]
30
25
20
15
10
-20 0-10 10 20 30 40
1
2

Technical information
19
Compress 7400i AW – 6721840487 (2021/10)
9.3 Refrigerant circuit
Fig. 19 Refrigerant circuit
[EC1] Heat exchanger (condenser)
[EL1] Evaporator
[ER1] Compressor
[JR0] Low pressure sensor
[JR1] High pressure sensor
[MR1] High pressure switch
[PL3] Fan
[TA4] Temperature sensor, drip pan
[TC3] Temperature sensor, heat transfer medium outlet
[TL2] Temperature sensor, air intake
[TR1] Temperature sensor, compressor
[TR3] Temperature sensor, condenser return (liquid), heating mode
[TR4] Temperature sensor, evaporator return (liquid), cooling
mode
[TR5] Temperature sensor, suction gas
[TR6] Temperature sensor hot gas
[VR0] Electronic expansion valve 2 (condenser)
[VR1] Electronic expansion valve 2 (evaporator)
[VR4] Four-way valve
MM
M
TT
TT
TT
TT
TT
TT
TR1
TR6
TR5
TR3TR4
JR1
PT
JR0
PS
MR1
TC3
TT
TL2
TT
TA4
VR0
VR1
VR4
ER1
PL3
EC1
EL1
PT

Technical information
Compress 7400i AW – 6721840487 (2021/10)
20
9.4 Wiring diagram
9.4.1 Wiring diagram for transformer, alternating current
Fig. 20 Wiring diagram for transformer, alternating current / three-phase current
[ER1] Compressor
[MR1] High pressure switch
[A] Inverter
[B] Mains voltage 230 V 1N~
[1] Power supply of I/O module
[2] MOD-BUS to I/O module
B
2
A
1
0010029641-001