Bosch CS5800iAW 180 MCP User manual

6 721 852 928 (2023/04) UK/IE
Installation and Maintenance Instructions
Pre plumbed cylinder
0010045491-001
CS5800iAW 180 MCP, CS5800iAW 210 MP and CS5800iAW 250 MP

Table of contents
Pre plumbed cylinder – 6 721 852 928 (2023/04)
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
3 Product Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1.1 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1.2 180 SL Dimensions and minimum clearances. . . . . . . . 4
3.1.3 210L and 250L Dimensions and minimum
clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.4 180 SL connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1.5 210L and 250L connections. . . . . . . . . . . . . . . . . . . . . . 8
3.1.6 Product overview 180 SL . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Product identification . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.1 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Standard accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.1 Required system components. . . . . . . . . . . . . . . . . . . . 11
3.3.2 Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Pre-Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Placement of the indoor unit . . . . . . . . . . . . . . . . . . . . . 11
4.2 Mains supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.1 Electrical supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2.2 Explanations for the hydraulic configuration . . . . . . . . 12
4.3 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3.1 Quality requirements for the heating water . . . . . . . . . 12
4.3.2 Water quality for potable water (DHW). . . . . . . . . . . . . 13
4.4 Minimum volume and execution of the heating
system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Check size of expansion vessel (central heating
side) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.6 Pressure relief pipework . . . . . . . . . . . . . . . . . . . . . . . . 14
4.7 Discharge Arrangement (DHW). . . . . . . . . . . . . . . . . . . 15
4.8 Cleaning primary systems . . . . . . . . . . . . . . . . . . . . . . . 16
4.8.1 Flushing the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Transport and storage . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2 Moving the appliance to the installation place . . . . . . . 17
5.3 Fastening the cylinder to the ground. . . . . . . . . . . . . . . 18
5.4 Installation checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.5 Installation of accessories . . . . . . . . . . . . . . . . . . . . . . . 18
5.5.1 Safety thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.6 Remove covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6 Hydraulic connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 Insulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.2 Pipe connections, general . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Connect the indoor unit to the heat pump . . . . . . . . . . 21
6.4 Connect the indoor unit to the heating system. . . . . . . 22
6.5 Connect the indoor unit to the mains water supply . . . . 22
6.6 Heat pump, indoor unit and heating system filling . . . . 23
7 Electrical connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.1 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.2 Cable types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3 Cable routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3.1 Power cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
7.3.2 Control and sensor cables. . . . . . . . . . . . . . . . . . . . . . . 24
7.4 Access to control box. . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.5 Replacing/connecting the power cables . . . . . . . . . . . 26
7.5.1 Removal/replacement of 230V supply cables . . . . . . . 27
7.5.2 Connection of 230V supplies at the XCU-SEH unit . . . . 27
7.5.3 Connection of 230V accessories at the XCU-SEH
unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.5.4 Overview of connectors in the XCU-SEH area . . . . . . . 28
7.6 Connection of control and sensor cables. . . . . . . . . . . 29
7.6.1 Installation/replacement of low voltage cables . . . . . . 29
7.6.2 CAN-BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.6.3 Installation of the temperature sensor . . . . . . . . . . . . . 30
7.6.4 Outdoor temperature sensor T1. . . . . . . . . . . . . . . . . . 30
7.6.5 Flow temperature sensor T0 . . . . . . . . . . . . . . . . . . . . . 30
7.6.6 External connections in XCU-THH area for control
& sensor cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.7 Replace cover and final checks. . . . . . . . . . . . . . . . . . . 31
8 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1 Commissioning checklist. . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Commissioning of the control panel. . . . . . . . . . . . . . . 31
8.3 Heat pump, indoor unit and heating system
ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.4 Operating temperatures . . . . . . . . . . . . . . . . . . . . . . . . 33
8.5 Function test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.5.1 Overheating protection (OHP) . . . . . . . . . . . . . . . . . . . 33
8.6 Finishing commissioning. . . . . . . . . . . . . . . . . . . . . . . . 33
8.6.1 Appliance/product guarantee. . . . . . . . . . . . . . . . . . . . 33
9 Inspection and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 34
9.1 Particle and magnetite filter . . . . . . . . . . . . . . . . . . . . . 34
9.2 DHW expansion vessel & PRVs . . . . . . . . . . . . . . . . . . . 34
9.3 Draining of appliance. . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.4 Shut down the heating system . . . . . . . . . . . . . . . . . . . 35
10 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10.1 Operating and fault displays . . . . . . . . . . . . . . . . . . . . . 35
11 Environmental protection and disposal . . . . . . . . . . . . . . . . . 35
12 Data Protection Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
13 Technical Specifications/Logs . . . . . . . . . . . . . . . . . . . . . . . . . 36
13.1 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . 36
13.2 Wiring diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
13.2.1 Wiring diagram of appliance . . . . . . . . . . . . . . . . . . . . . 37
13.2.2 Cable plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
13.2.3 Measurements from temperature sensors . . . . . . . . . . 38
13.3 Hydraulic configuration. . . . . . . . . . . . . . . . . . . . . . . . . 38
13.3.1 Heating circuit without mixer . . . . . . . . . . . . . . . . . . . . 39
13.3.2 Explanation of symbols . . . . . . . . . . . . . . . . . . . . . . . . . 41
13.3.3 Performance charts for circulation pumps. . . . . . . . . . 42
14 Benchmark Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Explanation of symbols and safety instructions
3
Pre plumbed cylinder – 6 721 852 928 (2023/04)
1 Explanation of symbols and safety instructions
1.1 Explanation of symbols
Warnings
In warnings, signal words at the beginning of a warning are used to
indicate the type and seriousness of the ensuing risk if measures for
minimizing danger are not taken.
The following signal words are defined andcan be used in this document:
DANGER
DANGER indicates that severe or life-threatening personal injury will
occur.
WARNING
WARNING indicates that severe to life-threatening personal injury may
occur.
CAUTION
CAUTION indicates that minor to medium personal injury may occur.
NOTICE
NOTICE indicates that material damage may occur.
Important information
The info symbol indicates important information where there isno 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.
Anyotheruseis consideredas notintended.Liabilitywillnotbe 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.
HElectrical work
Electrical work must only be carried out by a competent person in
relation to the electrical safety requirements of the relevant UK
regulations.
▶ Before starting electrical work;
– Ensure that the electricity supply is safely Isolated and secured to
prevent inadvertent re-connection.
Information on safe isolation can be found in the Health and
Safety Executive guidance HSG85.
– Using test equipment approved to GS38 to confirm that the
electricity supply is disconnected.
– Before touching live parts: Wait at least five minutes to discharge
the capacitors.
▶ Refer to the manufacturer’s information when installing non
Worcester components and systems to the Worcester appliance.
HConnection to supply mains
▶ There are two mains supply cables to this product
▶ Means to safely disconnect the unit from supply mains must be
incorporated.
Connection to the water supply (cold main)
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 (relative pressure).
The minimum permissible inlet pressure of the water is 1,5 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:
– Modificationsandrepairsmustonlybecarriedoutbyanapproved
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.
▶ Leavetheinstallationinstructions and theoperating instructionswith
the user for safekeeping.
2Regulations
Installation
The pre-plumbed cylinder is specifically designed to be installed in
conjunction with an air source heat pump.
Unvented cylinders are a controlled service as defined in the latest
edition of the building regulations and should only be carried by a
competent qualified installer.
The relevant regulations are:
England and Wales - Building Regulation Part G Section G3
Scotland - Technical Standard Section 4
Northern Ireland - Building Regulations Part F
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
Pre plumbed cylinder – 6 721 852 928 (2023/04)
4
After installation the Benchmark log book and included commissioning
sheets must be completed and left along with these instructions with the
householder for future reference.
Any water distribution and central heating installation must comply with
the relevant recommendations of the current version of Regulations and
British Standards listed below:
Building Regulations
IEE Requirements for Electrical Installations (BS 7671)
Water Regulations
Manual Handling Operations Regulations.
British Standards
Where no specific instruction is given, reference should be made to the
relevant British Standard codes of Practice.
• BS7074:1
– Code of practice for domestic and hot water supply
• BS7593
– Treatment of water in domestic hot water central heating systems
•BS6798
•BS5449
• BS5540:1
• BS5540:2
• CP331:3
•BS8558
•BS7671
– IET Wiring Regulations
Health and Safety Document No. 635
3ProductInformation
3.1 Scope of delivery
3.1.1 Scope of delivery
Fig. 1 Standard delivery
1. Indoor unit with pre-assembled filling link* (dotted outlined
enlargement)
Accessory pack
2. Hardware pack
3. Strap to lift the cylinder
4. Expansion vessel for domestic water 18L
5. Outdoor temperature sensor
6. Documentation
7. ErP label
8. Connect-Key K30
*The filling link is used only for installation and re pressuring, store the
braided hose close to indoor unit after system filling
Table 2 Model name, description
3.1.2 180 SL Dimensions and minimum clearances
• The following details cover the installation, service and maintenance
clearances for the product.
Note the dimensions and minimum clearances in the figures for all three
directions carefully. Note also the position of the door if installed in a
cupboard.
Model Name Cylinder Size/ Description
CS5800iAW 180 MCP 180 Litre Slim line (180 SL)
CS5800iAW 210 MP 210 litre (210 L)
CS5800iAW 250 MP 250 litre (250 L)
0010048061-001
1
2
5
3
4
7
6
8
Accessory pack (box)

Product Information
5
Pre plumbed cylinder – 6 721 852 928 (2023/04)
CAUTION
Risk of damage to product or property
The product will overheat if the clearance space around the product is
restricted by objects.
▶ Do not restrictthis spacewith theadditionof cupboards,shelvesetc.
next to or around the product.
▶ This product contains electrical components, do not store any
combustible materials on or next to the product, such as clothes,
towels, paper or plastic bags.
Fig. 2 Cylinder depth and height specifications (mm) and front, rear
and height clearances limitation (180 Litre Slim line)
Fig. 3 Cylinder width specifications (mm) and lateral clearances
limitation (180 Litre Slim line)
Fig. 4 Lateral clearance limitation and door frame minimum width
when installing in a cupboard with front door (180 Litre Slim
line)
0010046216-001
645.4
1708
≥600
≥200
≥50
(if fixed wall)
(if door in front)
≥50
0010046215-00
≥150
474
≥150
653 (including pump connector plug)
645
50
≥
50
≥
0010049304-001
Minimum required door width
≥655
Minimum overall width
≥774
Minimum overall depth
≥745.4
≥150
≥150

Product Information
Pre plumbed cylinder – 6 721 852 928 (2023/04)
6
3.1.3 210L and 250L Dimensions and minimum clearances
• The following details cover the installation, service and maintenance
clearances for the product.
Note the dimensions and minimum clearances in the figures for all three
directions carefully. Note also the position of the door if installed in a
cupboard.
CAUTION
Risk of damage to product or property
The product will overheat if the clearance space around the product is
restricted by objects.
▶ Do not restrictthis space with the addition of cupboards, shelves etc.
next to or around the product.
▶ This products contains electrical components, do not store any
combustible materials on or next to the product, such as clothes,
towels, paper or plastic bags.
Fig. 5 Cylinder depth and height specifications (mm) and front, rear
and height clearances limitation (210 litre base drawing - note
height differences to 250 litre)
Fig. 6 Cylinder width specifications (mm) and lateral clearances
limitation (both 210 and 250 litre, 210 litre base drawing)
Fig. 7 Lateral clearance limitation and door frame minimum width
when installing in a cupboard with front door (both 210 and
250 litre)
0010049196-001
747
Height
≥600
≥200
≥50
(if fixed wall)
table above
TANK SIZE HEIGHT
210
250
1561
1806
(if door in front)
≥50
0010049195-001
≥150
≥150
674 (including pump connector plug)
574
745
50
≥
50
≥
0010049306-001
≥150
≥150
Minimum overall depth
≥847
Minimum overall depth
≥874
Minimum required door width
≥680

Product Information
7
Pre plumbed cylinder – 6 721 852 928 (2023/04)
3.1.4 180 SL connections
Fig. 8 Connections dimensions for the 180sl cylinder
0010049234-001

Product Information
Pre plumbed cylinder – 6 721 852 928 (2023/04)
8
3.1.5 210L and 250L connections
Fig. 9 Connections dimensions for 210l and 250l cylinder
0010049319-001

Product Information
9
Pre plumbed cylinder – 6 721 852 928 (2023/04)
3.1.6 Product overview 180 SL
Fig. 10 Left and right view of 180 litre Pre-Plumbed Cylinder
0010044647-001
1
15
12
11
10
3
4
5
6
9
14
16
22
24
20
21
23
25
26
27
28
29
34
35
36
39
1*
2
7
8
14
13
1417
1418
19
30
31
32
33
37
18
38
*Remove the lling
link after the system
is lled

Product Information
Pre plumbed cylinder – 6 721 852 928 (2023/04)
10
Fig. 11 Enlarged view right-hand component cluster
Fig. 12 Enlarged view of left component cluster
Fig. 13 Enlarged view of e-heater with covers removed
1. DHW (Domestic Hot Water) outlet connection
– (1* equivalent DHW outlet connection position on the 210 and
250 litre versions of the Pre-Plumbed Cylinder)
2. Temperature sensor DHW top (TW2)
3. DHW circulation connection (optional)
4. Control unit UI800 CS
5. Control box
6. Heat transfer medium out (return to the heat pump)
7. Temperature sensor return temperature to heat pump TC0
8. Manual purge vent (behind the pipe)
9. Pressure sensor heating circuit JC0
10.Pressure gauge connection
11.Diverter valve
12. PRV (Pressure Relief Valve) heating circuit, 3 bar
13. Heat carrier pump PC0
14. Temperature sensor DHW bottom (TW1), behind the pump
15. Particle filter (filter with magnet)
16. 2nd Heating zone return (optional)
17. Return from the heating system
18. Mounting bracket
19. TPRV (Temperature & Pressure Relief Valve) DHW, 10 bar/90°C
20. Cold water inlet - inlet safety group
21. Pressure reducing valve, 3.5 bar - inlet safety group
22. Balanced cold feed - Inlet safety group
23.PRV (PressureReliefValve)DCW (Domestic ColdWater),6bar- Inlet
safety group
24. DHW expansion vessel connection - Inlet safety group
25.Tundish
26. Data plate
23
21
25
24
22
0010044648-001
20
19
0010044649-001
14
11
9
7
10
12
13
8
0010049512-001
35,a)
35,b)
35,c)

Pre-Installation
11
Pre plumbed cylinder – 6 721 852 928 (2023/04)
27. Flow to heating system
28. Circulation pump heating circuit PC1
29.2nd Heating zone flow (optional)
30.Flow temperature sensor heating circuit T0
31.Doublecheckvalvewith isolation valve,gauge port andpre-mounted
blanking cap
32.External filling link (braided metal hose with wing nuts) (*Remove
after the system is filled)
33. Isolation valve with pre-mounted blanking cap
34.Pressure gauge
35.Electrical heater 3kw (covered)
– 35a)Temperature safety switch for electrical heater - cable entry
at the front of the heater
– 35b) Temperature sensor flow primary flow from heat pump-Tc1-
cable entry at rear of the heater
– 35c) Power supply cable entry at the rear of the heater
36. Drain valve (cylinder)
37. Heat transfer medium in (from heat pump)
38.Drain Valve CH (Central Heating) system
39.Buffer vessel
3.2 Product identification
Data plate
The data plate contains performance data, approval data and the serial
number of the product.
The position of the data plate can be foundin theproductoverviewin this
chapter.
The G3 relevant symbols mean the following
Maximum pressure for space heating (bar)
Volume of domestic hot water cylinder (L)
3.2.1 Declaration of Conformity
The design and operating characteristics of this product comply with the
British, European and supplementary national requirements.
TheUKCAandCE markingsdeclarethat the product
complies with all the applicable British and
European legislation, which is stipulated by
attaching these markings.
You can request the complete text of the Declaration of Conformity from
the UK address indicated in this document.
3.3 Standard accessories
3.3.1 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]
• Expansion vessel
Hot tap water:
• Thermostatic valve hot 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.
3.3.2 Optional accessories
The following accessories can be added on and are not required for
operation of the system.
• Room controller
• Magnetite separator (system filter)
• Thermostatic valve hot water (required for DHW temperatures above
65 °C)
• DHW circulation pump
• Safety thermostat for under floor heating
• Non-return valve for the heating system
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
4Pre-Installation
NOTICE
Risk of damage to system or product!
Before installation
▶ All the following Pre-Installation sections must be read and
requirements met before starting product or ancillary equipment
installations.
▶ Run the connector pipes for the heating system and cold water/DHW
in the building up to the installation location of the indoor unit.
▶ This product is only suitable for installing internally within a property
at a suitable location onto a flat, fixed rigid surface at least the same
size as the product and capable of supporting the product weight.
▶ Product must be fixed to the floor using supplied mounting brackets.
▶ The system must be sealed and not open vented.
4.1 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.
• Themaximum pipelength between theheat pump andtheindoorunit
depends on the heat pump size as well as on the pipe diameter see
section 6.2
• The ambient temperature around the indoor unit shall be between
+10 °C and +35 °C.
• The unit must not be installed in a bathroom/wet room or outdoors
No surface protection is required against heat transfer from the product.

Pre-Installation
Pre plumbed cylinder – 6 721 852 928 (2023/04)
12
4.2 Mains supply
4.2.1 Electrical supply
• There must be two electrical supplies to the appliance: control unit
and heater. It must be possible to isolate each supply.
• Supply: 230V AC - 50 Hz (each)
• This product must not be connected to a three phase supply.
• The wiring between the product and the electrical supply must
comply with the latest IET wiring regulations that apply to wiring to
Class 1 fixed equipment.
• The appliance incorporates low energy DC modulating pumps. If an
RCD is required, it must be minimum type A. Type AC must not be
used. This applies only to the control unit (not the heater).
• The product must be earthed.
• Cable 1 (control unit): Heat resistant PVC 3-core flexible cable
1.0mm2 to H05V2V2-F.
• Cable 2(heater): Heat resistant PVC 3-core flexible cable 2.5mm2 to
H05V2V2-F.
• Additional equipment wired to the product must comply with the
latest IET wiring regulations.
4.2.2 Explanations for the hydraulic configuration
4.3 Water quality
4.3.1 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 3 must not be exceeded, even if national
directives contain higher limits.
Table 3 Boundary conditions for potable water (filling water)
▶ Check the pH value after > 3 months of operation. Ideally at the first
service.
Table 4 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
Fig. 14 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
General
XCU-THH (XCU
HY)
Installer module integrated into the indoor unit
UI800 User interface
CR10 Room controller (accessories)
T1 Outside temperature sensor
PW2 DHW circulation pump (accessories)
TW1 DHW temperature sensor
Heating circuit without mixing valve
PC1 Circulation pump for heating circuit
MC1 Safety thermostat
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
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

Pre-Installation
13
Pre plumbed cylinder – 6 721 852 928 (2023/04)
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 5 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.
Continuous introduction ofoxygen 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
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 wateradditives 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 6
4.3.2 Water quality for potable water (DHW)
The integrated domestic hot water cylinder is constructed to heat and
store potable water. Follow country-specific regulations and standards
forpotablewater.The waterqualityin thecylinder hastocomply withthe
framework of EU directive 2020/2184.
Use in hard water areas:
In areas where temporary water hardness exceeds 200ppm (11.2°dH),
consideration should be given to reducing the dhw temperature to 50-
55° C*. Additionally consideration may need to be given to the fitting of a
scale prevention device. In such circumstances, the advice of the local
water authority should be sought.
*Ensure legionella protection with the settings on the HMI!
Water mains pressure:
• Minimum mains water pressure, for maximum performance refer to
section 13.1 "Technical specifications".
• Maximum mains fed water static pressure is 10 bar.
Water hardness unit conversion
°dH °e °fH ppm mmol/l
1°dH= 11,25 1,8 17,8 0,1783
1°e= 0,798 1 1,4 14,3 0,142
1°fH= 0,56 0,7 110 0,1
1 ppm
CaCO3
(USA)
0,056 0,07 0,1 1 0,01
1mmol/l= 5,6 7,02 10 100 1
1) Only applicable in the United Kingdom
ADEY www.adey.com
FERNOX www.fernox.com
SENTINEL www.sentinelprotects.com/uk

Pre-Installation
Pre plumbed cylinder – 6 721 852 928 (2023/04)
14
4.4 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.
4.5 Check size of expansion vessel (central heating side)
Characteristic diagram for expansion vessel
Table 7 Capacities of expansion vessel
4.6 Pressure relief pipework
CAUTION
Scalding risk from hot water or steam!
▶ The pressure relief valve (PRV) and temperature & pressure relief
valve (TPRV) are appliance safety devices and may discharge hot
water or steam when activated.
▶ The outlet pipe should be sited in such a way that it does not cause a
hazard or an obstruction when discharging, for example above a
window, entrance door or other public access way.
▶ The point of termination should provide a visual indicator in case the
PRV/TPRV discharges.
• The pressure relief discharge pipe [1 or 3] should be run in pipe
which has a diameter of at least 15mm, that is made of copper or a
material that will withstand PRV/TPRV discharge temperatures and
pressures, and which complies with BS 5254 or BS EN 1451.
• Plastic pipework must be properly supported with a maximum of
300mm between supports to prevent sagging.
• ThePRVdischargepipe mustruncontinuouslydownwardsaway from
the appliance to a safe point of discharge.
• The pressurereliefshould dischargeawayfromanyelectrical orother
hazard, preferably to an external drain or soak-away.
• The pipe [1 or 3] should be finished with a partial bend, to face the
external wall (as shown) to ensure safe discharge of hot water.
• In all normal circumstances a PRV discharge pipe installation as
described above sufficiently meets all but the most exceptional
circumstances.
– Where the PRV discharge pipe could be susceptible to damage,
vandalism, freezing etc that could cause either a blockage or
restriction in the ability to discharge safely then a tundish should
be considered. The tundish should be sited in a position where
damage to the property or injury to occupants cannot occur from
any spillage or discharge.
Fig. 15 Pressure relief pipework
[1] Discharge pipe (turned back onto external wall example)
[2] Outside wall
[3] Discharge pipe (into drain or gully example)
[4] External drain
Safety valve
setting (bar)
3.0
Vesselcharge
and initial
system
pressure
(bar)
0.5 1.0 1.5
Total water
content of
system
(litres)
Select an expansion vessel with a nominal volume not
less than given below (litres)
25 2.1 2.7 3.9
50 4.2 5.4 7.8
75 6.3 8.2 11.7
100 8.3 10.9 15.6
125 10.4 13.6 19.5
150 12.5 16.3 23.4
175 14.6 19.1 27.3
200 16.7 21.8 31.2
225 18.7 24.5 35.1
250 20.8 27.2 39.0
275 22.9 30.0 42.9
300 25.0 32.7 46.8
Multiplying
factors for
other system
volumes
0.0833 0.109 0.156
1
2
3
4
2
3
4
1
2
6720818077-38.1Wo

Pre-Installation
15
Pre plumbed cylinder – 6 721 852 928 (2023/04)
4.7 Discharge Arrangement (DHW)
Fig. 16 Diagram of a typical discharge pipe arrangement (extract from
Building Regulation G3)
[1] Safety device (e.g. temperature relief valve)*
[2] Metal discharge pipe (D1) from temperature relief valve to
tundish*
[3] Discharge pipe (D2) from tundish with continuous fall
[4] Fixed grating
[5] Trapped gulley
[6] Tundish*
*The positions (1), (2) and (6) are already pre-installed on PPCy
Connect the Tundish and route the discharge pipe. The discharge
pipework mustbe routed in accordance withPart G3of schedule1 of the
Building Regulations. The information that follows is not exhaustive and
if you are in doubt you should seek advice.
The two safety valves will only discharge water under fault conditions.
When operating normally water will not be discharged.
The tundish should be vertical, located in the same space as the
unvented hot water storage system and be fitted as close as possible and
within 600mm of the safety device e.g. the temperature relief valve.
(all the above is already preplumbed)
The discharge pipe (D2) from the tundish should terminate in a safe
place where there is no risk to persons in the vicinity of the discharge
and:
• Be at least one pipe size larger than the nominal outlet size of the
safety device unlessits total equivalent hydraulic resistance exceeds
that of a straight pipe 9 m long i.e. discharge pipes between 9 m and
18 m equivalent resistance length should be at least two sizes larger
than the the nominal outlet size of the safety device, between 18 and
27 m at least 3 sizes larger, and so on. Bends must be taken into
account in calculating the flow resistance. Refer to Fig. 16, Table 8
and the worked example.
An alternative approach for sizing discharge pipes would be to follow
British specification standards for design installation, testing and
maintenance of services supplying water for domestic use within
buildings and their curtilages.
• Have a vertical section of pipe at least 300 mm long, below the
tundish before any elbows or bends in the pipework.
• Be installed with a continuous fall.
• It is preferable for the discharge to be visible at both the tundish and
the final point of discharge but where this is not possible or
practically difficult there should be clear visibility at one or other of
these locations. Examples of acceptable discharge arrangements
are:
– Ideally below the fixed grating and above the water seal in a
trapped gulley.
– Downward discharges at a low level; i.e. up to 100 mm above
external surfaces such as car parks, hard standing, grassed areas
etc. are acceptable providing that where children play or
otherwise come into contact with discharges, a wire cage or
similar guard is positioned to prevent contact whilst maintaining
visibility.
– Discharges at a high level; e.g. in to metal hopper and metal down
pipe with the end of the discharge pipe clearly visible (tundish
visible or not) or onto a roof capable of withstanding high
temperature discharges of water and 3 m from any plastic
guttering systems that would collect such discharges (tundish
available).
– Where a single pipe serves a number of discharges, such as in
blocks of flats, the number served should be limited to not more
than 6 systems so that any installation can be traced reasonably
easily. The single common discharge pipe should be at least one
pipe size larger than the largest individual discharge pipe to be
connected. If unvented hot water storage systems are installed
where discharges from safety devices may not be apparent i.e. in
dwellings occupied by blind, infirm or disabled people,
consideration should be given to the installation of an
electronically operated device to warn when discharge takes
place.
NOTICE
▶ The discharge may consist of scalding water and steam. Asphalt,
roofing felt and non-metallic rainwater goods may be damaged by
such discharges.
▶ It is only acceptable to discharge into a soil pipe if certain conditions
stipulated in the G3 regulations are met.
0010017083-001
600 mm
maximum
300 mm
minimum
1
2
6
34
5

Pre-Installation
Pre plumbed cylinder – 6 721 852 928 (2023/04)
16
The table below is based on copper tube. Plastic pipes may be of different bore and resistance. Sizes and maximum lengths of plastic should be
calculated using data prepared for the type of pipe being used.
Table 8 Sizing of copper discharge pipe “D2” for common temperature relief valve outlet sizes
Worked example:
The example below is for a G1/2 temperature relief valve with a
discharge pipe (D2) having 4 No. 22 mm elbows and length of 7 m from
the tundish to the point of discharge.
From Table 8:
Maximum resistance allowed for a straight length of 22 mm copper
discharge pipe (D2) from a G1/2 temperature relief valve is: 9.0 m
Subtract the resistance for 4 No. 22 mm elbows at 0.8 m each = 3.2 m
Therefore the maximum permitted length equates to 5.8 m which, is less
than the actual length of 7 m therefore calculate the next largest size of
discharge pipe (D2).
Maximum resistance allowed for a straight length of 28 mm copper
discharge pipe (D2) from a G1/2 temperature relief valve is: 18 m
Subtract the resistance for 4 No. 28 mm elbows at 1.0 m each = 4 m
Therefore the maximum permitted length equates to: 14 m
As the actual length is 7 m, a 28 mm (D2) copper pipe will be
satisfactory.
4.8 Cleaning primary systems
NOTICE
Risk of damage to system or appliance!
Debrisfromthe system candamage theappliance andreduceefficiency.
Failure to comply with the guidelines for the use of water treatment with
the appliance will invalidate the applianceguarantee and contravene the
Building Regulations.
▶ It is a requirement of the Building Services Compliance Guide which
is a second tier document to the Building Regulations to flush and
inhibit the primary water system in accordance with BS 7593.
▶ The Building Services Compliance Guiderecommendsthata primary
water cleanser is fitted to the system.
▶ The filter fitted to the appliance will help remove both magnetite and
non-magnetic debris.
NOTICE
Risk of damage to system or appliance!
▶ Salt based, artificially softened water that adjusts the pH value MUST
NOT be used to fill the system.
▶ Alternatively there are water softening/treatment products that do
not adjust or alter the pH levels of the water.
With these products it may not be necessary to provide an untreated
water by-pass to the primary water filling point of the heat system
Before cleaning the system:
▶ Ensure that the system and pipework is in good working order.
▶Where possible keep the existing appliance/circulating pump in
place when flushing the system before installing the new
appliance. Alternatively use an after market power flushing
system or similar to remove magnetite and other debris from the
central heating system.
– Even new central heating systems contain contaminants that
need to be removed before treatingthe system with inhibitor/anti-
freeze.
– When an appliance is installed onto a new system then it is
possibletouse theappliancewhilst cleaningthesystem.Asystem
filter must be fitted to the return to reduce the risk of
contaminants entering the appliance.
▶Follow the guidance of BS7593.
4.8.1 Flushing the system
Flushing the system using existing appliance/circulating pump or new
appliance.
Existing appliances/circulation pumps
▶ An existing appliance/circulating pump should be used to flush the
system before the new appliance is installed.
New appliances
▶ A new appliance must only be used to assist the cleaning of a newly
installed system.
▶ Fill the system with cold water and check for leaks.
▶ Open all drain cocks and drain the system.
▶ Close drain cocks and add a suitable flushing agent at the correct
strength for the system conditions in accordance with the
manufacturer‘s instructions.
▶ Mark the position of the lockshield valves and open them fully.
▶ Fully open all TRVs.
▶ Circulate the flushing agent before the appliance is fired up.
▶ Run the appliance/system at normal operating temperature as
directed by the manufacturer of the flushing agent.
▶ Drain and thoroughly flush the system to remove the flushing agent
and debris. Do not drain the system through the PRV of new
appliances.
Valve outlet size Minimum sizeof discharge
pipe D11)
1) see Fig. 16
Minimum size of discharge
pipe D2 from tundish
Maximum resistance
allowed, expressed as a
lengthofstraight pipe (i. e.
no elbows or bends)
Resistance created by
each elbow or bend
G1/2 15 mm 22 mm
28 mm
35 mm
up to 9 m
up to 18 m
up to 27 m
0.8 m
1.0 m
1.4 m
G3/4 22 mm 28 mm
35 mm
42 mm
up to 9 m
up to 18 m
up to 27 m
1.0 m
1.4 m
1.7 m
G1 28 mm 35 mm
42 mm
54 mm
up to 9 m
up to 18 m
up to 27 m
1.4 m
1.7 m
2.3 m

Installation
17
Pre plumbed cylinder – 6 721 852 928 (2023/04)
▶ It may be necessary to use a power flushing machine to aid the
cleansing procedure in some circumstances.
▶ Close the drain cocks and manual air vents.
For existing appliance/circulating pump actions.
▶ Add a suitable inhibitor to the system in accordance with the
manufacturers instructions.
▶ Fill the system to between 0.8 and 1.7 bar via a WRAS approved
filling loop (supplied with the appliance)
▶ Vent any air from the appliance and system.
For new appliance.
▶ Once the new appliance has been installed follow the guidance in
Filling the appliance and adding additive, see section Heating water
additives.
5 Installation
CAUTION
Risk of injury!
During transport and installation there is a risk ofcrushing injury. During
maintenance, internal parts of the appliance may become hot.
▶ The installer is obliged to wear gloves during transport, installation
and maintenance.
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 Moving the appliance to the installation place
Never lift the cylinder by the pipes. Lifting is only allowed via lifting
straps at the top the cylinder.
Two people are needed when unpacking, holding and moving the
cylinder. There is a risk of it falling over
Retain the brackets to secure the cylinder in place
As soon as the brackets are released, the cylinder must always be held
tightly or otherwise fixed in place.
▶ Remove the strapping tape, top cap and sleeve
▶ Hold the cylinder at the handles so that it can not fall over
▶ Unscrew the bolts from the pallet, holding the cylinder and remove
the brackets.
▶ Keep the brackets for the later fastening of the cylinder.
Fig. 17 Bracket removal: person 2 removes the brackets while person 1
holds the cylinder.
Fig. 18 Lifting the 180 SL and 210 L and 250 L cylinder. Tilt and touch
the cylinder before lifting. Person 1 pulls the cylinder closer
while person 2 supports the base. (210 L and 250 L have a
additional handhold in the underside base insert)
As soon as the brackets are released, the cylinder must always be held
tightly or otherwise fixed in place
Do not load the cylinder from the front
▶ Use a transport trolley to move the appliance to it installation place.
▶ Loaded from behind to avoid tipping over sideways and held
permanently
▶ attach additional straps to secure the safe hold on the trolley
0010049007-001
Person 1 Person 2
Person 1 Person 2
0010049015-001

Installation
Pre plumbed cylinder – 6 721 852 928 (2023/04)
18
Fig. 19 Requirement for appliance transport with trolley: Danger of
tipping (left), danger of cylinder damage loading from the front
(middle) and appropriate transport permanently holding the
appliance (right)
5.3 Fastening the cylinder to the ground
Product positioning
▶ Ensure the filled product is mounted onto a flat, fixed rigid surface
capable of supporting the product weight.
▶ Ensureall aspectsof theinstallation areconsideredwhen positioning
the product, connecting pipework, maintenance access etc.
▶ Ensure the product is fixed to floor using the provided mounting
brackets.
5.4 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 PRV pipe work.
3. Connect heat pump to the indoor unit.
4. Connect the indoor unit to the heating system.
5. Install a magnetite separator (magnetite separator is only optional for
new building with only under-floor heating system).
6. Connect the mains water supply to the indoor unit and the pressure-
relief valve.
7. Mount the outside temperature sensor and any room controller
(room controller optional).
8. Connect the CAN-BUS cable to the heat pump and the indoor unit.
9. Install any accessories.
10.Connect the EMS-BUS cable to accessories if needed.
11.Fill and vent the DHW cylinder.
12. Fill and vent the heating system before commissioning.
13.Establish the electrical connection of the system.
14.Commission the system.
15.Vent the heating system also during the commissioning.
Product connections
NOTICE
Appliance - hydraulic connections
▶ Ensure all water pipework, to be connected, is isolated/drained and
follow all relevant safety precautions.
▶ Be careful of plastic and adjacent components when using a naked
flame on pipework.
▶ Check tightness of compression fittings on appliance before filling
the system.
Surplus water may be present inside the appliance due to factory testing.
5.5 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
integration of accessories in the corresponding app and in the packaging
of the Connect-Key K30RF.
▶ Place the module in the holder ([1], figure 20). A LED will flash
when properly inserted.
Fig. 20 Connect-Key K30RF placement
0010049016-001
Not
Permitted:
Lateral loading
and not held
Not
Permitted:
Front loading
risks cylinder
damage
Proper transport
loaded from behind
and held
permanently
1
0010048850-001

Hydraulic connections
19
Pre plumbed cylinder – 6 721 852 928 (2023/04)
5.5.1 Safety thermostat
Insome countries, asafetythermostatis requiredtobe installedin under
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 safetythermostat 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.
5.6 Remove covers
NOTICE
Transport protection covers
▶ Remove any internal transport packaging and protection covers from
the product where applicable.
6 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.
If Installation is done without a heating circuit, the pipes needs to be
capped.
▶ Put caps on the flow- and return pipes to the heating system.
6.1 Insulation
NOTICE
Material damage due to frost and UV radiation
In case of a power outage the water pipes 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 19mm 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.
▶ Ensure the drain valves are insulated.
▶ Use UV and moisture resistant insulation.
▶ Insulate the entire pipe length where it passes through the wall
▶ In buildings, use insulation with a thickness of at least 12mm 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.
6.2 Pipe connections, general
Dimension the pipes according to the instructions (table 9 and
table 10)
▶ 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
pipes also devibrate and insulate against noise transfer to theheating
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.
▶ Ensure the pipe has flexibility to prevent vibrations from the heat
pump connection with a hose intended for outside use and insulate it.
Fig. 21 Pipe length A
[A] pipe length of flow return line
[1] indoor unit
[2] Heat pump
0010048080-001
1
A
2

Hydraulic connections
Pre plumbed cylinder – 6 721 852 928 (2023/04)
20
Table 9 Pipe dimensions and maximum pipe lengths (one-way) for connecting a heat pump to indoor unit
Table 10 Pipe dimensions and maximum pipe lengths (one-way) for connecting a heat pump to indoor unit
copper pipes (dimensions according to EN 1057)
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)
p (mbar)2)
2) For pipes between the heat pump and indoor unt.
Outer Ø 15
(mm)
Outer Ø 22
(mm)
Outer Ø 28
(mm)
Outer Ø 35
(mm)
Inner Ø 13,6
(mm)
Inner Ø 20,2
(mm)
Inner Ø 26.2
(mm)
Inner Ø 32,6
(mm)
Maximum pipe length A (m), Figure 21
4 5 11,5 469 12 30
5 5 14,4 363 6 30
7 5 20,2 74 5 18 30
PEX pipes (dimensions according to EN 16893)
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)
p (mbar)2)
2) For pipes between the heat pump and indoor unit.
Outer Ø 25
(mm)
Outer Ø 32
(mm)
Outer Ø 40
(mm)
Inner Ø 20,4
(mm)
Inner Ø 26,2
(mm)
Inner Ø 32,4
(mm)
Maximum pipe length A (m), Figure 21
4 5 11,5 469 30
5 5 14,4 363 30
7 5 20,2 74 5 16 30