Bosch Compress 5800i AW User manual

6721858460 (2023/06) IE
Installation Instructions
Indoor unit for air to water heat pump
Compress 5800i AW
0010038628-001
CS5800iAW 12 M SST

Table of contents
Compress 5800i AW – 6721858460 (2023/06)
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 Product Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Standard delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Information about the indoor unit. . . . . . . . . . . . . . . . . . 4
2.4 Dimensions and minimum clearances . . . . . . . . . . . . . . 4
2.5 Product Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6 Roof panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.7 Regulations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.8 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.8.1 Required system components. . . . . . . . . . . . . . . . . . . . . 8
2.8.2 Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.8.3 Room controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Preparing for installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 Placement of the indoor unit . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.1 Quality requirements for the heating water . . . . . . . . . . 9
3.3 Minimum volume and execution of the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 Check size of expansion vessel . . . . . . . . . . . . . . . . . . . 12
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Transport and storage . . . . . . . . . . . . . . . . . . . . . . . . . .12
4.2 Moving the appliance to the installation place . . . . . . .13
4.3 Remove the front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.4 Installation checklist . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.5 Sizing the gas DHW circulation lines . . . . . . . . . . . . . . . 15
4.6 Installation of accessories . . . . . . . . . . . . . . . . . . . . . . .15
4.6.1 External connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.2 Safety thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.3 Summary alarm (with accessory module) . . . . . . . . . .15
4.7 Installation with cooling mode. . . . . . . . . . . . . . . . . . . . 15
4.7.1 Installation with non-condensing cooling mode. . . . . .15
4.7.2 Mounting the condensation sensor. . . . . . . . . . . . . . . .16
4.7.3 Condensing cooling mode with fan convectors . . . . . . 16
5 Hydraulic connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Pipe connections, general . . . . . . . . . . . . . . . . . . . . . . .17
5.3 Connect the indoor unit to the heat pump . . . . . . . . . .17
5.4 Connect the indoor unit to the heating system. . . . . . . 18
5.5 Connect the indoor unit to the tap water . . . . . . . . . . . 19
5.6 Heat pump, indoor unit and heating system filling . . . .20
6 Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 Safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.2 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.3 CAN-BUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
6.4 EMS-BUS for accessories . . . . . . . . . . . . . . . . . . . . . . . 22
6.5 Installation of the temperature sensor . . . . . . . . . . . . . 22
6.6 Flow temperature sensor T0 . . . . . . . . . . . . . . . . . . . . . 22
6.7 Outdoor temperature sensor T1 . . . . . . . . . . . . . . . . . . 22
6.8 External inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.9 Establishing the power supply connection. . . . . . . . . . 23
6.9.1 Main supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.9.2 Cable feeds in the indoor unit . . . . . . . . . . . . . . . . . . . . 23
6.9.3 Terminal connections in electric box . . . . . . . . . . . . . . 24
6.9.4 Terminal connections in electric box . . . . . . . . . . . . . . 25
6.9.5 Terminal connections of accessories in electric
box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.9.6 Connections XCU-THH (XCU HY) module . . . . . . . . . . . 28
7 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1 Commissioning checklist. . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 Commissioning of the control panel . . . . . . . . . . . . . . . 29
7.3 Heat pump, indoor unit and heating system
ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.4 Adjusting the operating pressure of the heating
system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.5 Operating temperatures . . . . . . . . . . . . . . . . . . . . . . . . 30
7.6 Adjusting the Electrical auxiliary heater . . . . . . . . . . . . 31
7.7 Function test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.7.1 Overheating protection (OHP) . . . . . . . . . . . . . . . . . . . 31
8 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1 Particle filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.2 Service of expansion vessel . . . . . . . . . . . . . . . . . . . . . 32
8.3 Draining of appliance. . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.4 Shut down the heating system . . . . . . . . . . . . . . . . . . . 33
9 Environmental protection and disposal . . . . . . . . . . . . . . . . . 33
10 Technical information and reports . . . . . . . . . . . . . . . . . . . . . 33
10.1 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . 33
10.2 Hydraulic configuration . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.2.1 Explanations to the hydraulic configuration. . . . . . . . . 34
10.2.2 Heating circuit without mixer . . . . . . . . . . . . . . . . . . . . 35
10.2.3 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . 36
10.2.4 Performance charts for circulation pumps. . . . . . . . . . 37
10.3 Wiring diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
10.3.1 Wiring diagram XCU-THH (XCU HY) module. . . . . . . . . 38
10.3.2 Power supply indoor unit, standard . . . . . . . . . . . . . . . 40
10.3.3 Cable plan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
10.3.4 Measurements from temperature sensors . . . . . . . . . . 41

Explanation of symbols and safety instructions
3
Compress 5800i AW – 6721858460 (2023/06)
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
Theinfosymbol indicatesimportant information wherethere 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
The indoor unit is intended for use in closed heating systems in
residential buildings.
Any other use - including the use exclusively for heating domestic hot
water without connection to a heating system - is considered improper
use. Any resulting damages are excluded from liability.
HInstallation, commissioning and service
The product may only be installed, brought into operation and
maintained by trained personnel.
▶ Use only original spare parts.
HElectrical work
Electrical work must only be carried out by electrical installation
contractors.
Before starting electrical work:
▶ Isolate all poles of the mains voltage and secure against
reconnection.
▶ Make sure the main voltage is disconnected.
▶ Before touching live parts: Wait at least 5 minutes to discharge the
capacitors.
▶ Observe the wiring diagrams of other system components as well.
HConnection to supply mains
Means to safely disconnect the unit from supply mains must be
incorporated.
▶ Install a safety switch that disconnects all poles from supply mains.
The safety switch shall be an over voltage category III appliance.
HSupply cord
If the supply cord is damaged, it must be replaced by the manufacturer,
its service agent or similarly qualified persons in order to avoid a hazard.
HConnection to the water supply
This unit is designed to be permanently connected to the water supply.
The connection must not be established with a hose set.
The maximum inlet pressure of the water is 10 bar.
The minimum permissible inlet pressure of the water is 2 bar.
HHandover to the user
When handing over, instruct the user how to operate the heating system
and inform the user about its operating conditions.
▶ Explain how to operate the heating system and draw the user's
attention to any safety relevant action.
▶ In particular, point out the following:
– Modificationsand repairsmustonlybecarriedout byanapproved
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.
▶ Leavetheinstallationinstructionsandthe operatinginstructions with
the user for safekeeping.
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)

Product Information
Compress 5800i AW – 6721858460 (2023/06)
4
2 Product Information
2.1 Standard delivery
Fig. 1 Standard delivery
[1] Indoor unit
[2] Particle filter
[3] Connect-Key K30RF
[4] Outside temperature sensor
[5] Documentation
2.2 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: Please select a unique language-country combination from
attribute “Language-Country” @ <LanguagePart>..
2.3 Information about the indoor unit
The indoor units CS5800iAW 12 M are intended for connection to AW
OR-S and AW OR-T heat pumps.
CS5800iAW 12 M has an integrated booster heater, DHW cylinder and a
small size buffer cylinder.
2.4 Dimensions and minimum clearances
There should be at least 50 mm between the indoor unit's sides and
other fixed installations (walls, sinks, etc.). Ideal positioning is by an
external wall or a partition wall.
Fig. 2 Minimum distance (mm)
0010049779-001
1 2
3
54
0010038921-003
_
>
800 600
_
>
4001782
_
>
50

Product Information
5
Compress 5800i AW – 6721858460 (2023/06)
Fig. 3 Dimensions (mm)
0010038640-002
1782
600
_
>
50

Product Information
Compress 5800i AW – 6721858460 (2023/06)
6
Fig. 4 Dimensions, connections, top view
0010038642-002
152,3
86,8
217,8
386,5
308
422,1
514,5
600
47,6
83,8
155,4
600

Product Information
7
Compress 5800i AW – 6721858460 (2023/06)
2.5 Product Overview
Fig. 5 Product overview, front and top view
[1] Manual purge valve
[2] Electric heater
[3] Buffer cylinder
[4] Heat carrier pump PC0
[5] Manometer
[6] Drain valve heating water (CH)
[7] Manual purge valve
[8] Expansion vessel
[9] Heating system primary pump PC1
[10] Type plate*
*The type plate of the indoor unit can be found inside the appliance. It
contains information on the part number and serial number and also the
date of manufacture of the device.
0010049961-001
1
2
3
5
4
7
8
9
10
6

Product Information
Compress 5800i AW – 6721858460 (2023/06)
8
2.6 Roof panel
Fig. 6 Product overview top view
[1] Flow to heating system
[2] DHW outlet connection
[3] Cold water inlet connection
[4] Heat transfer medium out (to the heat pump)
[5] Heat transfer medium in (from heat pump)
[6] Label for pipe connections
[7] Return from heating system
[8] DHW circulation connection (accessory)
2.7 Regulations
Follow the directives and regulations given below:
• Local provisions and regulations of the electricity supplier and
corresponding special rules
• National building regulations
•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)
•EN60335-2-40 (Particular requirements for electrical heat pumps,
air-conditioners and dehumidifiers)
•PED, 2014/68/EU (Pressure equipment directive)
2.8 Accessories
2.8.1 Required system components
The following components are not included in the standard delivery but
are required for the initial startup and operation of the system.
Heating system:
• Automatic air vent valve [VL1]
• Magnetite filter/separator (not necessary if the system only consists
of newly installed underfloor heating)
• Equipment for filling of heating and DHW system
• Non-return valve if the cooling mode is to be used.
2 3
4
5
7
1
0010038584-004
8
6

Preparing for installation
9
Compress 5800i AW – 6721858460 (2023/06)
A non-return valve may be necessary to prevent self-circulation in the
heating system. This can mainly arise in the following situations:
▶ Heating system with radiators.
▶ The indoor unit is installed below the heating system (basement or
multi-story building).
▶ The outdoor unit is installed on the same height or below the indoor
unit.
Hot tap water:
• Non-return valve for incoming cold water
• Pressure relief valve cold water
Heat pump:
• Manual valve [VC4] between the indoor unit and the heat pump. The
valve is used when filling and venting the system. It is not allowed to
completely disconnect the heat pump from the indoor unit, therefore
only one valve is required.
2.8.2 Optional accessories
The following accessories can be added on and are not required for
operation of the system.
• Room controller
• Connect-Key K30RF wireless module
• Thermostatic valve hot water
• DHW circulation pump
• Safety thermostat for under floor heating
• Condensation sensor for non -condensing cooling mode
2.8.3 Room controller
For higher system efficiency, it is recommended to integrate room
controllers instead of thermostatic radiator valves in the heating system.
The room controller provides feedback that will automatically adjust the
heating curve to control the room temperature. This ensures that the
heat pump will only operate when there is heating or cooling demand.
3 Preparing for installation
▶ Run the connector pipes for the heating system and cold water/DHW
in the building up to the installation location of the indoor unit.
▶ Mount and align adjustable feet provided so that the indoor unit is
level.
3.1 Placement 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.
• The ambient temperature around the indoor unit shall be between
+10 °C and +35 °C.
3.2 Water quality
3.2.1 Quality requirements for the heating water
The quality of the fill and top-up water is an essential factor for increased
efficiency, functional reliability, long service life and for maintaining the
operational readiness of a heating system.
Unsuitable water can damage the heat exchanger or cause a fault in the
heat generator or DHW supply!
Unsuitable or contaminated water can lead to sludge formation,
corrosion or scaling. Unsuitable antifreeze or hot water additives
(inhibitors or anti-corrosion agents) can damage the heat generator and
heating system.
▶ Only fill the heating system with potable water. Do not use well or
groundwater.
▶ Determine the water hardness of the filling water, before filling the
system.
▶ Flush the heating system prior to filling.
▶ If magnetite (iron oxide) is present, anti-corrosion measures are
required and the installation of a magnetite separator and a de-airing
valve in the heating system is recommended.
▶ The limit values in table 2 must not be exceeded, even if national
directives contain higher limits.
Table 2 Boundary conditions for potable water (filling water)
▶ Check the pH value after > 3 months of operation. Ideally at the first
service.
Table 3 pH value ranges after > 3 months of operation
▶ Treat the fill and top up water according to the instructions in the
following section.
Depending on the hardness of the filling water, the system water volume
and the maximum heat output of the heat generator, water treatment
may be required to avoid a damage in water heating installations, due to
the formation of lime scale.
Water quality Unit Value
Conductivity μS/cm ≤ 2500
pH ≥ 6,5... ≤ 9,5
Chloride ppm ≤ 250
Sulphate ppm ≤ 250
Sodium ppm ≤ 200
Material of heat
generator
Heating water pH value range
Copper brazed
heat exchangers
•Untreated potable water
•Fully softened water
7.51) – 10.0
1) If pH value is < 8.2 an on-site test for ferrous corrosion is necessary
• Low-salt operation < 100 μS/
cm
7.01) – 10.0

Preparing for installation
Compress 5800i AW – 6721858460 (2023/06)
10
Requirements on the fill and top-up water
Fig. 7 Heat generators < 50 kW-100 kW
[x] Total hardness in °dH
[y] Maximum possible water volume over the service life of the heat
source in m3
[1] Above the curve, only use desalinated fill and top-up water, with a
conductivity of ≤ 10 μS/cm
[2] Below the curve, untreated fill and top-up water according to
drinking water regulation can be used
For systems with a specific system water content >40 l/kW, water
treatment is mandatory. If there are several heat generators in the
heating system, then the system water volume must be related to the
heat generator with the lowest output.
Table 4 Water hardness unit conversion
A recommended and approved method for water treatment is
desalination of the fill and top-up water to a conductivity of ≤ 10 μS/cm.
Prevention of corrosion
In most cases, corrosion plays only a minor role in heating systems.
However, a precondition for this is that the system is a corrosion-sealed
water heating installation. This means that there is practically no access
of oxygen to the system during operation.
Continuousintroductionof oxygenleads tocorrosion andcanthuscause
rusting and rust sludge formation. Sludge formation can not only cause
blockages and therefore a diminished heat supply but also deposits
(similar to lime scale deposits) on the hot surfaces of the heat exchanger.
The amount of oxygen introduced by the fill- and top-up water are
generally very small and can therefore be ignored.
To avoid oxygenation, connection pipes must be diffusion-tight!
The use of rubber hoses should be avoided.
The intended connection accessories should be used in the installation.
During operation, pressure maintenance with regard to oxygen ingress
and in particular the function, correct sizing and correct setting (pre-
charge pressure) of the expansion vessel is of highest importance.
Check the pre-charge pressure and function annually.
Furthermore, the function of automatic air vents should also be checked
during maintenance.
It is also important to check and document the top-up water quantities
via a water meter. Larger and regularly required water top-up quantities
indicate insufficient pressure maintenance, leaks or continuous oxygen
input.
Antifreeze
Unsuitable antifreeze can damage the heat exchanger or cause a fault in
the heat source or DHW supply.
Unsuitable antifreeze can damage the heat source and heating system.
Only use antifreeze as listed in the document 6720841872, which
contains antifreeze products approved by us.
▶ Only use antifreeze according to the specifications of the
manufacturer, e.g with regard to the minimum concentration.
▶ Follow the instructions of the manufacturer of the antifreeze about
regular checking of the concentration and corrective measures.
▶ The use of antifreeze reduces the efficiency.
Heating water additives
Unsuitable heating water additives can cause damage to the heat source
and heating system or cause a fault in the heat source or DHW supply.
The use of a heating water additive, e.g. corrosion inhibitor, is only
allowed, if the manufacturer of the heating water additive certifies its
suitability for all materials in the heating system.
▶ Only use heating water additives in accordance with the instructions
of its manufacturer about concentration, regular checking of the
concentration and corrective measures.
Sealants in the heating water can cause deposits in the heat generator,
therefore it is not advisable to use it.
Suitable water treatment products (inhibitors/cleaners) can be
obtained from the following manufacturers:
Follow the guidance of BS7593:20191) for treatment of water in
domestic hot water heating systems.
Table 5
Quality requirements for the heating water
The quality of the fill and top-up water is an essential factor for increased
efficiency, functional reliability, long service life and for maintaining the
operational readiness of a heating system.
Unsuitable water can damage the heat exchanger or cause a fault in the
heat generator or DHW supply!
Unsuitable or contaminated water can lead to sludge formation,
corrosion or scaling. Unsuitable antifreeze or hot water additives
Water hardness unit conversion
°dH °e °fH ppm mmol/l
1°dH= 1 1,25 1,8 17,8 0,1783
1°e= 0,798 1 1,4 14,3 0,142
1°fH= 0,56 0,7 1 10 0,1
1 ppm
CaCO3
(USA)
0,056 0,07 0,1 1 0,01
1mmol/l= 5,6 7,02 10 100 1
0010048707-001
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
2,80
3,00
0 5 10 15 20 25 30
x
y
< 50 kW
< 100 kW
1
2
1) Only applicable in the United Kingdom
ADEY www.adey.com
FERNOX www.fernox.com
SENTINEL www.sentinelprotects.com/uk

Preparing for installation
11
Compress 5800i AW – 6721858460 (2023/06)
(inhibitors or anti-corrosion agents) can damage the heat generator and
heating system.
▶ Only fill the heating system with potable water. Do not use well- or
groundwater.
▶ Determine the water hardness of the filling water, before filling the
system.
▶ Flush the heating system prior to filling.
▶ If magnetite (iron oxide) is present, anti-corrosion measures are
required and the installation of a magnetite separator and a de-airing
valve in the heating system is recommended.
For German market:
▶ The fill and top-up water must meet the requirements of the German
Drinking Water Ordinance (TrinkwV).
For markets outside Germany:
▶ The limit values in table 6 must not be exceeded, even if national
directives contain higher limits.
Table 6 Boundary conditions for potable water
▶ Check the pH value after > 3 months of operation. Ideally at the first
service.
Table 7 pH value ranges after > 3 months of operation
▶ Treat the fill and top-up water according to the instructions in the
following section.
Depending on the hardness of the filling water, the system water volume
and the maximum heat output of the heat generator, water treatment
may be required to avoid a damage in water heating installations, due to
the formation of lime scale.
Requirements on the fill and top-up water for heat generators made
of aluminium and Heat pumps.
Fig. 8 Heat generators < 50 kW-100 kW
[x] Total hardness in °dH
[y] Maximum possible water volume over the service life of the heat
source in m3
[1] Above the curve, only use desalinated fill and top-up water, with a
conductivity of ≤ 10 μS/cm
[2] Below the curve, untreated fill and top-up water according to
drinking water regulation can be used
For systems with a specific system water content >40 l/kW, water
treatment is mandatory. If there are several heat generators in the
heating system, then the system water volume must be related to the
heat generator with the lowest output.
A recommended and approved method for water treatment is
desalination of the fill and top-up water to a conductivity of ≤ 10 μS/cm.
Instead of water treatment, system separation with a heat exchanger,
directly after the heat generator, can be provided.
Prevention of corrosion
In most cases, corrosion plays only a minor role in heating systems.
However, a precondition for this is that the system is a corrosion-sealed
water heating installation. This means that there is practically no access
of oxygen to the system during operation. Continuous introduction of
oxygen leads to corrosion and can thus cause rusting and rust sludge
formation. Sludge formation can not only cause blockages and therefore
a diminished heat supply but also deposits (similar to lime scale
deposits) on the hot surfaces of the heat exchanger.
The amount of oxygen introduced by the fill- and top-up water are
generally very small and can therefore be ignored.
To avoid oxygenation, connection pipes must be diffusion-tight!
The use of rubber hoses should be avoided. The intended connection
accessories should be used in the installation.
During operation, pressure maintenance with regard to oxygen ingress
and in particular the function, correct sizing and correct setting (pre-
charge pressure) of the expansion vessel is of highest importance.
Check the pre-charge pressure and function annually.
Furthermore, the function of automatic air vents should also be checked
during maintenance.
It is also important to check and document the top-up water quantities
via a water meter. Larger and regularly required water top-up quantities
indicate insufficient pressure maintenance, leaks or continuous oxygen
input.
Antifreeze
Water quality Unit Value
Conductivity μS/cm ≤ 2500
pH ≥ 6,5... ≤ 9,5
Chloride ppm ≤ 250
Sulphate ppm ≤ 250
Sodium ppm ≤ 200
Material of heat
generator
Heating water pH value range
Ferrous,Copper,
copper brazed
heat exchangers
•Untreated potable water
•Fully softened water
7.51) – 10.0
1) If pH value is < 8.2 an on-site test for ferrous corrosion is necessary
• Low-salt operation < 100 μS/
cm
7.01) – 10.0
Aluminium •Untreated potable water 7.51) – 9.0
• Low-salt operation < 100 μS/
cm
7.01) – 9.0
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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
2,80
3,00
0 5 10 15 20 25 30
x
y
< 50 kW
< 100 kW
1
2

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Compress 5800i AW – 6721858460 (2023/06)
12
Unsuitable antifreeze can damage the heat exchanger or cause a fault in
the heat source or DHW supply.
Unsuitable antifreeze can damage the heat source and heating system.
Only use antifreeze listed in the document 6720841872, which
contains antifreeze products approved by us.
▶ Only use antifreeze according to the specifications of the
manufacturer, e.g with regard to the minimum concentration.
▶ Follow the instructions of the manufacturer of the antifreeze about
regular checking of the concentration and corrective measures.
Heating water additives
Unsuitable heating water additives can cause damage the heat source
and heating system or cause a fault in the heat source or DHW supply.
The use of a heating water additive, e.g. corrosion inhibitor, is only
allowed, if the manufacturer of the heating water additive certifies its
suitability for all materials in the heating system.
▶ Only use heating water additives in accordance with the instructions
of its manufacturer about concentration, regular checking of the
concentration and corrective measures.
Heating water additives, e.g. corrosion inhibitors, are only required in
the case of constant oxygen permeation, which cannot be prevented
through other means.
Sealants in the heating water can cause deposits in the heat generator,
therefore it is not advisable to use it.
Water quality for potable water (DHW)
The integrated domestic hot water cylinder is constructed to heat and
store potable water. Follow country-specific regulations, directives and
standards for potable water. The water quality in the cylinder has to
comply with the framework of the EU directive 2020/2184.
To protect the DHW system against increased lime scale and resulting
service work on domestic hot water tanks:
Table 8 Recommendation for hard domestic water
3.3 Minimum volume and execution of the heating
system
Normally the energy for the defrost cycle is drawn form the buffer
cylinder and the heating system, but in small systems with low flow the
controller may switch to draw energy from the DHW cylinder instead.
Even the electrical heater may be activated to ensure a proper defrost.
3.4 Check size of expansion vessel
Characteristic diagram for expansion vessel (17 l)
The following graph can be used to estimate whether the installed
expansion vessel will be sufficient or whether an additional expansion
vessel will be required (not for underfloor heating).
For the curves shown, the following parameters were taken into account:
• 1 % water seal in the expansion vessel or 20 % of the rated volume in
the expansion vessel
• Working pressure differential of the pressure relief valve of 0.5 bar
• Pre-charge pressure of the expansion vessel corresponds to the
static system height above the appliance.
• Max. operating pressure: 3 bar
Fig. 9 Curves for the expansion vessel (17 l)
Legend to fig. 9:
I Pre-charge pressure 0.5 bar
II Pre-charge pressure 0.75 bar (default setting)
III Pre-charge pressure 1.0 bar
IV Pre-charge pressure 1.2 bar
V Pre-charge pressure 1.3 bar
A Operating capacity of the expansion vessel
B Additional expansion vessel required
T Flow temperature
V System content in litres
▶ If results are borderline: determine precise vessel size in accordance
with country-specific regulations.
▶ Ifthe intersectionis on therightbeside the curve:install anadditional
expansion vessel.
4 Installation
CAUTION
Risk of injury!
During transport and installation there is a risk of crushing injury. During
maintenance, internal parts of the appliance may become hot.
▶ The installer is obliged to wear gloves during transport, installation
and maintenance.
NOTICE
Risk of material damage!
Particles in the pipework of the heating system can damage the heat
pump system.
▶ Installation of a particle filter is mandatory for all systems.
4.1 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.
Water hardness Recommendation
≥ 15°dH/25°fH/2,5 mmol/l Set DHW temperature < 55 °C
≥ 21°dH/37°fH/3,7 mmol/l Install a water treatment system
0010043330-001
500400200 300
100
0 700600
40
30
50
60
70
T [°C]
VA[l]
A
IV
III
II I
V
B

Installation
13
Compress 5800i AW – 6721858460 (2023/06)
4.2 Moving the appliance to the installation place
▶ Unscrew the bolts from the pallet and remove the brackets.
Fig. 10 Remove the bolts and the brackets
▶ Remove the front panel.
▶ Two persons are needed to lift the appliance from the pallet.
▶ Use the two brackets in the front and the long bracket in the back of
the appliance to lift it.
Fig. 11 Brackets for carrying
▶ Use a transport trolley to move the appliance to its installation place.
Fig. 12 Transport trolley with appliance
▶ Remove the screw indicated by a label at the back of the appliance
before finally placing it at the installation place. This will allow
dismounting of the side cover.
Fig. 13 Remove screw and label
Alternative method to carry the appliance
The wooden parts, metal brackets and straps from the outdoor unit
CS5800iAW can be reused to carry the indoor unit.
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0010049962-001
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1
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Compress 5800i AW – 6721858460 (2023/06)
14
Fig. 14 Wooden parts, metal brackets and straps
▶ Makesurethe text“IDU” on the woodenparts is facing upwards.Then
the cut-outs will fit over the feet on the indoor unit.
Fig. 15 Wooden part
▶ Place the wooden parts and metal brackets under the indoor unit and
attach the straps.
Fig. 16 Brackets and straps attached to indoor unit
NOTICE
Risk of damage!
The metal brackets and the wooden parts are not firmly attached to the
appliance, there is thus a risk that it can slide while carrying.
The bracket and wooden part are only intended for transporting the
appliance vertically, as there is a risk of loosing the stability due to high
center of gravity.
▶ Be at least two persons while carrying the appliance.
▶ Do not use the brackets and wooden parts for horizontal transport,
e.g staircase.
4.3 Remove the front
Fig. 17 Remove the front
4.4 Installation checklist
Each installation is unique. The following checklist provides a general
description of how the installation should be performed.
1. Install the fill valve.
2. Install the non-return valve (if the cooling mode is to be used).
3. Install the leakage drain hoses.
4. Connect heat pump to the indoor unit.
5. Connect the indoor unit to the heating system.
6. Install particle filter and magnetite separator (magnetite separator is
only optional for new building with only under-floor heating system).
7. Connect the tap water to the indoor unit and the pressure-relief valve.
8. Mount the outside temperature sensor and any room controller.
9. Connect the CAN-BUS cable to the heat pump and the indoor unit.
10.Install any accessories.
0010048275-001
0010048276-001
0010048277-001
0010038655-001
2.
3.
1.
4.

Installation
15
Compress 5800i AW – 6721858460 (2023/06)
11.Connect the EMS-BUS cable to accessories if needed.
12.Fill and vent the DHW cylinder.
13. Fill and vent the heating system before commissioning.
14.Establish the electrical connection of the system.
15.Commission the system.
16.Vent the heating system also during the commissioning.
4.5 Sizing the gas DHW circulation lines
If the following conditions are observed, an extensive calculation can be
omitted for one to four-family houses:
• DHW circulation, single and common lines with an internal diameter
of at least 10 mm
• DHW circulation pump DN 15 with a flow max. of at most 200 l/h and
a flow pressure of 100 mbar
• Length of the DHW lines max. 30 m
• Length of the DHW circulation line max. 20 m
• The temperature drop must not exceed 5 K
To easily observe these specifications:
▶ Install a control valve with thermometer.
To save electrical and thermal energy, do not run the DHW circulation
pump continuously.
4.6 Installation of accessories
Placement of the Connect-Key K30RF
You can find information on the Connect-Key K30RF, the WIFI
connection, establishing the connection with the Internet and
integrationof accessories in the correspondingappandinthepackaging
of the Connect-Key K30RF.
▶ Place the module in the holder ([1], figure 18). A LED will flash
when properly inserted.
Fig. 18 Connect-Key K30RF placement
4.6.1 External connections
Maximum load at relay outputs: 5A, 400W, cos At a higher load
an intermediate relay must be installed.
• Relay output PK2 is active in cooling mode. Possible application
areas:
– Changingbetweencooling/heatingforfancoils. This requiresthat
the fan convector's control unit has this feature.
– Pump control in a separate circuit which is exclusively intended
for cooling mode.
– Underfloor heating system control in damp rooms.
4.6.2 Safety thermostat
Insome countries, a safetythermostat isrequiredtobeinstalledinunder
floor heating circuits. The safety temperature limiter is connected to
external input 3. Set the operation for external input (control unit
manual).
It is recommended to use a safety thermostat with automatic reset.
If the switching temperature of the safety thermostat is set too low or the
thermostat is placed too close to the indoor unit, this may lead to a
temporary blockage of the heating circuit pump PC1 and the heat
sources after DHW charging.
▶ Set a temperature that is suited for the floor.
▶ Place the thermostat at least >1m from the indoor unit.
4.6.3 Summary alarm (with accessory module)
The appliance has no output for summary alarm. If there is a need for a
summary alarm this has to be accomplished by installing of an accessory
module MU100.
▶ Install the accessory module and do the settings for summary alarm
before commissioning of the system (manual for accessory
module).
4.7 Installation with cooling mode
4.7.1 Installation with non-condensing cooling mode
Aroomtemperature-dependentcontrolunitmust beinstalledforcooling
mode.
Installing room temperature-dependent control units with an integrated
condensation sensor increases the safety of cooling mode since the flow
temperature in this case is automatically controlled via the control unit in
accordance with the current dew point.
▶ Insulate all connections and pipes from condensation.
▶ Install a non-return valve.
▶ Installthe roomtemperature-dependentcontrolunit (instructions
for the respective room temperature-dependent control unit).
▶ Mount the condensation sensor.
▶ Make necessary settings for the cooling mode in the service menu,
section Heating circuit settings (instructions for control unit).
– Select Cooling or Heating and cooling.
– If necessary, set switch-on temperature, switch-on delay,
difference between room temperature and dew point and
minimum flow temperature.
0010040169-001
1

Hydraulic connections
Compress 5800i AW – 6721858460 (2023/06)
16
▶ Turn off the underfloor heating circuits in damp areas (e.g. bathroom
and kitchen), and if necessary control via relay output PK2.
4.7.2 Mounting the condensation sensor
NOTICE
Material damage due to moisture!
If the system is operated below the dew point in cooling mode, this
causes moisture to precipitate on adjacent materials (floor).
▶ Do not operate underfloor heating systems in cooling mode below
the dew point.
▶ Set the correct flow temperature.
Condensation sensors are mounted on the pipes of the heating system
and send a signal to the control unit as soon as they detect condensate
formation. Installation instructions are enclosed with the sensors.
The control unit deactivates the cooling mode as soon as it receives a
signal from the condensation sensors. Condensate forms in cooling
mode when the temperature of the heating system is below the
corresponding dew point temperature.
The dew point will vary depending on temperature and humidity. The
higher the humidity, the higher flow temperature is required to remain
above dew point and avoid condensation.
4.7.3 Condensing cooling mode with fan convectors
It is mandatory to install a non-return valve to use the cooling mode (
see required accessories chapter in 2.8.1).
NOTICE
Material damage due to moisture!
Without full insulation against condensation, moisture can attack
neighbouring materials.
▶ Provide all pipes and connections up to the fan convector with
condensation insulation.
▶ Use an insulating material designed for cooling systems with
condensate formation.
▶ Connect condensate pipes to the drain.
▶ Do not use a condensation sensor when in cooling mode below the
dew point.
▶ Do not use a room temperature-dependent control unit with
integrated condensationsensorwhen in cooling mode belowthe dew
point.
When exclusively fan convectors with a drain and insulated pipes are
used, the flow temperature can be reduced to 7 °C.
NOTICE
Thermal breach!
When the cooling mode is used below dew point, the resulting
condensation may damage other components of the appliance.
▶ To avoid thermal breach, the installer should insulate the thermal
pipes (see Fig. 19 "Pipes that require insulation, when the
cooling mode is used below dew point").
Fig. 19 Pipes that require insulation, when the cooling mode is used
below dew point
5 Hydraulic connections
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.
5.1 Insulation
NOTICE
Material damage due to frost and UV radiation!
In case of a power outage the water in the pipes may freeze.
The insulation may become brittle due to UV radiation and crack after
some time.
▶ Use insulation with a thickness of at least 19 mm for pipework and
connections outdoors.
▶ Install drain valves so that the water can be drained out of the lines to
and from the heat pump if it is not going to be used for some time or
if there is a risk of frost.
▶ Use UV and moisture-resistant insulation.
▶ Insulate the wall insertion.
▶ In buildings, use insulation with a thickness of at least 12 mm for
pipework. This is also important for safe and efficient DHW mode.
3
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Hydraulic connections
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Compress 5800i AW – 6721858460 (2023/06)
All heat-conducting pipework must be provided with suitable thermal
insulation according to applicable regulations.
Incooling mode, allconnectionsand lines mustbeinsulatedaccordingto
applicable standards to prevent condensation.
5.2 Pipe connections, general
Dimension the pipes according to the instructions (table 9).
▶ Avoid pipe joints in the heat transfer pipes to minimise pressure
drop.
▶ Use PEX pipes for all connections between the heat pump and indoor
unit.
▶ Use only material (pipes and connections) from the same PEX
distributor to avoid leakage.
▶ Pre-insulated AluPEX pipes are recommended since they make
installation easier and prevent gaps in the insulation. PEX or AluPEX
pipesalsodevibrate and insulateagainst noise transfer tothe heating
system.
If a different material than PEX is used, the following is required:
▶ Install a particulate filter intended for outdoor use on the heat pump
return line, directly on the heat exchanger.
▶ Insulate the particle filter as other connections.
▶ Devibrate the heat pumpconnection with a hose intendedfor outside
use and insulate it.
Fig. 20 Pipe length A
[1] Indoor unit, floor standing
[2] Heat Pump
Table 9 Pipe dimensions and maximum pipe lengths (one-way) for connecting a heat pump to indoor unit CS5800iAW 12 M
5.3 Connect the indoor unit to the heat pump
▶ Connect the flow line from the heat pump to the heat transfer
medium in. Install an automatic air vent valve (VL1) in this line.
▶ Connect the return line to the heat pump to the heat transfer medium
out. Install a valve (VC4) in this line. Install the fill valve (VW2) on the
same connection on the indoor unit.
1
2
A
0010039879-001
Heat
Pump
Heat transfer
fluid delta (K)1)
1) Minimum dT at rated power and maximum pipe length. A lower dT can be achieved with lower heat requirements or short pipe lengths.
Nominal flow
(L/min)
Δp (mbar)2)
2) For pipes between the heat pump and indoor unit.
AX20 inner Ø 15
(mm)
AX25 inner Ø 18
(mm)
AX32 inner Ø 26
(mm)
AX40 inner Ø 33
(mm)
Maximum pipe length [A, Figure 20] PEX (m)
44 15
3)
3) A flow rate of 15 l/min must be guaranteed on the primary side.
420 9 24 30
5 5 17,3 355 6 15 30
7 5 20,2 263 8 30
10 5 27,4 255 30 30
12 6 34,6 201 21 30

Hydraulic connections
Compress 5800i AW – 6721858460 (2023/06)
18
Fig. 21 Connect the indoor unit to the heat pump
[1] Heat transfer medium in (from heat pump)
[2] Heat transfer medium out (to the heat pump)
[3] Filling equipment and fill valve VW2
[4] Flow line from the heat pump
[5] Return line to the heat pump
5.4 Connect the indoor unit to the heating system
1. Route drain hoses from the pressure relief valves into a frost
protected drain.
2. Connect the heating system return line. Install the particle filter
(SC1) and magnetite filter in this line.
3. Connect the heating system flow line.
1
0010038718-002
2
4 5
VC4
VW2
3
VL1
VC5

Hydraulic connections
19
Compress 5800i AW – 6721858460 (2023/06)
Fig. 22 Indoor unit connections to the heating system
[1] Heating system return line
[2] Heating system flow line
[*] It is mandatory to install a non-return valve to use the cooling
mode (see required accessories chapter in 2.8.1).
Fig. 23 Indoor unit backside
[1] Drain hose
5.5 Connect the indoor unit to the tap water
WARNING
Risk of system damage
If the function of the pressure-relief valve cannot be guaranteed,
excessive pressure occurs in the system.
▶ WARNING – Make sure that the pressure relief valve outlet is never
plugged or shut off.
WARNING
Risk of scalding!
If the installation requires DHW temperatures >65 °C (i.e for solar
thermal systems, combination with wood boilers or similar), a
temperature mixing device must be installed.
The pressure relief valve, the non-return valve for incoming cold water,
the fill valve and the DHW mixer must be installed in the tap water circuit
(not included in the scope of delivery).
▶ Install the pressure relief valve and cold water valve (VW3) with a
non-return valve for tap DHW.
▶ Pull the leakage drain water line from the pressure relief valve to a
frost protected outlet.
▶ Connect optional pump for domestic hot tap water (accessory).
▶ Connect domestic hot water out [1].
▶ Connect cold water in [2].
▶ The domestic tap water system must be protected from pollution at
the installation
TT
*
1
0010038735-005
2
SC1
1
0010049184-001

Hydraulic connections
Compress 5800i AW – 6721858460 (2023/06)
20
Fig. 24 Heat pump connections tap water
[1] Domestic hot water out
[2] Cold water inlet
5.6 Heat pump, indoor unit and heating system filling
NOTICE
The system will be damaged if it is powered up without water.
The system may be damaged if it is powered up without water.
▶ Fill the DHW cylinder and heating system before powering on the
heating system, and establish the correct pressure.
NOTICE
If the system is not correctly ventilated (purged), 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.
CAUTION
Health risk caused by pollution of drinking water !
Prior to tap water filling:
▶ Flush tank and tap water hydraulic.
▶ Perform tap water system tightness test.
Tightness test must be done with tap water only. Test pressure at warm
water side shall not exceed 10 bar.
Vent also by other ventilation valves 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 the venting valves.
At delivery the default position of the three-way valve VW1 is in middle
position.
Fig. 25 Indoor unit, heat pump and heating system
[1] Fill valve VW2
[2] Particle filter SC1
[3] Manual air vent valves
[4] Drain valve VA0
[*] The non-return valve is required for heating systems.
[**] Expansion vessel (external expansion vessel, if it is not
integrated)
This filling procedure is valid for all systems, also where the heat pump is
placed above the indoor unit. For a less complex system the procedure
may be simplified.
Step 1: Filling the heat pump and the DHW cylinder
1. Switch of the power to the heat pump and the indoor unit.
2. Ensure that all temperature regulation valves in the heating system
are fully open.
3. Close the valves to the heating system, VC3 and particle filter SC1,
and the valve VC4 between IDU and ODU.
4. Connect a hose to the drain valve VC5 and the other end to an outlet.
Open the valve.
5. Open the fill valve VW2 to fill the heat pump.
6. Continue filling until only water comes out of the hose by the drain
and there are no more bubbles in the heat pump.
7. Open the valve VC4.
8. Close the drain valve VC5 and the fill valve VW2.
9. Open the cold water valve VW3.
VW3
1 2
0010038743-002
VC2
PC1 TC1
T0 TC0
PC0
PW2
VW2
VC3
SC1
VW3
VA0
MD1
*)
VC4
VL1
VC5
VW1
**)
**)
3
2
1
3
0010040382-005
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