Nibe AP-BW30 User manual

We reserve the right to make technical changes.
83053706dUK – Translation of the operating manual
Operating Manual UK
Brine / Water
Professional
Heat pumps
NIBE AP-BW30

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NIBETM AP-BW30 We reserve the right to make technical changes 83053706dUK – Translation of the operating manual
Please read rst
This operating manual provides important information
on the handling of the unit. It is an integral part of the
product and must be stored so that it is accessible in the
immediate vicinity of the unit. It must remain available
throughout the entire service life of the unit. It must be
handed over to subsequent owners or users of the unit.
In addition to this operating manual, you must also have
the operating manual for the heating and heat pump
regulator and the operating manual for your heat pump.
Read the operating manual before working on or
operating the unit. This applies in particular to the
chapter on safety. Always follow all instructions
completely and without restrictions.
It is possible that this operating manual may contain
instructions that seem incomprehensible or unclear. In
the event of any questions or if any details are unclear,
contact the factory customer service department or the
manufacturer’s local partner.
Since this operating manual was written for several
different models of the unit, always comply with the
parameters for the respective model.
This operating manual is intended only for persons
assigned to work on or operate the unit. Treat all
constituent parts condentially. The information
contained herein is protected by copyright. No part of
this manual may be reproduced, transmitted, copied,
stored in electronic data systems or translated into
another language, either wholly or in part, without the
express written permission of the manufacturer.
Symbols
The following symbols are used in the operating manual.
They have the following meaning:
Information for operators.
Information or instructions for qualied
personnel.
DANGER!
Indicates a direct impending danger
resulting in severe injuries or death.
WARNING!
Indicates a potentially dangerous situation
that could result in serious injuries or
death.
CAUTION!
Indicates a potentially dangerous situation
that could result in medium or slight
injuries.
ATTE NTION .
Indicates a potentially dangerous situation, which
could result in property damage.
NOTE.
Emphasized information.
€ENERGY SAVING TIP
Indicates suggestions that help to save energy,
raw materials and costs.
Reference to other sections of the operating
manual.
Reference to other documents of the
manufacturer.

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Inhaltsverzeichnis
INFORMATION FOR USERS AND QUALIFIED
PERSONNEL
PLEASE READ FIRST..................................................................2
SYMBOLS .....................................................................................2
INTENDED USE..........................................................................4
DISCLAIMER................................................................................4
EC CONFORMITY .....................................................................4
SAFETY .........................................................................................4
CUSTOMER SERVICE ................................................................5
WARRANTY / GUARANTEE ....................................................5
DISPOSAL ....................................................................................5
OPERATING PRINCIPLE OF HEAT PUMPS..........................5
AREA OF UTILISATION............................................................5
HEAT METERING .......................................................................6
OPE R ATI ON ................................................................................6
CARE OF THE UNIT..................................................................6
MAINTENANCE OF THE UNIT ..............................................6
Cleaning and flushing of unit components........................7
MALFUNCTIONS.......................................................................7
INSTRUCTIONS FOR QUALIFIED PERSONNEL
SCOPE OF DELIVERY......................................................7
INSTALL ATION ..........................................................................8
Installation area.....................................................................8
Transport to installation location......................................8
Installation..............................................................................9
INSTALLATION OF THE HYDRAULIC CONNECTIONS10
Buffer tank ...........................................................................10
Domestic water heating.....................................................10
Domestic hot water tank ..................................................10
Installing the housing..........................................................12
ELECTRICAL CONNECTIONS .............................................14
INSTALLATION OF THE CONTROL ELEMENT ...............16
FLUSHING AND FILLING THE UNIT..................................16
flushing and filling the heat source...................................17
flushing and filling the heating circuit ..............................17
INSULATING THE HYDRAULIC CONNECTIONS ..........19
COMMISSIONING ...................................................................19
DISMANTLING .........................................................................19
TECHNICAL DATA / SCOPE OF DELIVERY
AP-BW30-37-69, AP-BW30-29H–56H ...........................20
PERFORMANCE CURVES
AP-BW30-37........................................................................22
AP-BW30-45 .......................................................................23
AP-BW30-58........................................................................24
AP-BW30-69........................................................................25
AP-BW30-29H.....................................................................26
AP-BW30-56H ....................................................................27
DIMENSIONAL DRAWINGS AND INSTALLATION PLANS
AP-BW30-37 to AP-BW30-69
Dimensional drawings - moving dimensions...................28
Dimensional drawings with housing ................................29
AP-BW30-29H to AP-BW30-56H
Dimensional drawings - moving dimensions...................30
Dimensional drawings with housing ................................31
INSTALLATION PLAN
AP-BW30-37 to 69, AP-BW30-29H to AP-BW30-56H32
AP-BW30-37 to 69, AP-BW30-29H- to 56H .................33
TERMINAL DIAGRAM.............................................................34
AP-BW30-37 to 69
,
AP-BW30-29H to 56H ....................... 34
CIRCUIT DIAGRAMS
AP-BW30-37
,
AP-BW30-45 ................................................... 35
AP-BW30-58
,
AP-BW30-69
,
AP-BW30-56H..................... 38
APPENDIX
EC DECLARATION OF CONFORMITY............................. 44

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NIBETM AP-BW30 We reserve the right to make technical changes 83053706dUK – Translation of the operating manual
Intended use
The unit may be used only for the intended purpose.
This means:
•For heating.
•For domestic water heating.
•For cooling (active + passive through external
hydraulics)
The unit may be operated only within its technical
parameters.
Overview “Technical data / scope of delivery”.
NOTE.
Notify the responsible power supply company of
the use of a heat pump or heat pump system.
Disclaimer
The manufacturer is not liable for losses resulting from
any use of the unit which is not its intended use.
The manufacturer’s liability also expires:
•If work is carried out on the unit and its
components contrary to the instructions in this
operating manual.
•If work is improperly carried out on the unit and
its components.
•If work is carried out on the unit which is not
described in this operating manual, and this
work has not been explicitly approved by the
manufacturer in writing.
•If the unit or components in the unit have been
altered, modied or removed without the explicit
written consent of the manufacturer.
EC conformity
The unit bears the CE mark of conformity.
EC declaration of conformity
Safety
The unit is safe to operate for its intended use. The
construction and design of the unit conform to current
state of the art standards, all relevant DIN/VDE
regulations and all relevant safety regulations.
Every person who performs work on the unit must
have read and understood the operating manual prior
to starting any work. This also applies if the respective
person has already worked with such a unit or a similar
unit or has been trained by the manufacturer.
Every person who performs work on the unit must
comply with the applicable accident prevention and
safety regulations. This applies in particular to the
wearing of personal safety gear.
DANGER!
Risk of fatal injury due to electric shock!
All electrical connections must be carried
out by qualied electricians only.
Before opening the unit, disconnect the
system from the power supply and prevent
it from being switched back on!
WARNING!
Only qualied personnel (trained heating,
cooling and refrigerant engineers and
electricians) may carry out work on the
unit and its components.
WARNING!
Observe safety labels on and in the unit.
WARNING!
Unit contains refrigerants!
Leaking refrigerant could result in
personal injury or material damage.
Therefore:
– Switch off unit
– Thoroughly ventilate installation room
– Notify the manufacturer’s authorised
service centre
ATTE NTION
For safety reasons:
Never disconnect the unit from the power
supply, unless the unit is being opened.

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Customer service
For technical information please contact your local
heating engineer or the manufacturer’s local partner.
Overview “Customer service”.
Warranty / Guarantee
For warranty and guarantee conditions, please refer to
the purchase documents.
NOTE.
Please contact your dealer about all matters
concerning warranties and guarantees.
Disposal
When decommissioning the old unit, always comply with
local applicable laws, directives and standards concerning
the recovery, recycling and disposal of materials and
components of cooling units.
“Dismantling”.
Operating principle of heat
pumps
Heat pumps operate on the same principle as a
refrigerator: same technology, only with reversed
benets. The refrigerator extracts heat from foods,
which is released into the room through ns on the back.
The heat pump extracts heat from our environment:
air, earth or ground water. The extracted heat is
conditioned in the unit and supplied to the heating water.
Even when it is extremely cold outside, the heat pump
draws enough heat to heat a house.
Example: drawing of a brine/water heat pump with oor
heating:
4/4= usable energy
approx. 3/4= environmental energy
approx. 1⁄4= external electrical
energy
Area of utilisation
Taking into consideration the ambient conditions, limits
of application and the applicable regulations, every heat
pump can be utilised in new or existing heating systems.
Overview “Technical data / scope of delivery”.

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NIBETM AP-BW30 We reserve the right to make technical changes 83053706dUK – Translation of the operating manual
Heat metering
In addition to proof of the unit’s efciency, the
EEWaermeG also requires heat metering (hereafter
referred to as HQR). Heat metering is mandatory for
air/water heat pumps. Heat metering for brine/water
and water/water heat pumps only have to be installed
for a ow temperature ≥ 35 °C. The heat metering must
record the total thermal energy released (heating and
domestic hot water) in the building. In heat pumps with
heat metering, the analysis is carried out by the regulator.
The regulator displays the thermal energy discharged in
the heating system in kWh.
Operation
Your decision to purchase a heat pump or a heat
pump system is a long-term contribution to protecting
the environment through low emissions and reduced
primary energy use.
To ensure that your heat pump or heat pump system
operates efciently and ecologically, the following are
especially important:
€ENERGY SAVING TIP
Avoid unnecessarily high ow temperatures.
A lower ow temperature on the hot water side
increases the efciency of the system.
€ENERGY SAVING TIP
Preferably use purge ventilation. Compared to
continuously open windows, it is better to air
rooms by fully opening windows for a short
period, two to three times a day (so-called
“rapid” or “purge” ventilation); this reduces
energy consumption and your heating bill.
You can operate and control the heat pump system
with the control element of the heating and heat pump
regulator.
NOTE.
Make sure that the control settings are correct.
Operating manual of the heating and heat pump
regulator.
Care of the unit
The outer surfaces of the unit can be cleaned with a
damp cloth and standard cleaning products.
Do not use cleaning or care products that contain
abrasives, acids and/or chlorine. Such products would
destroy the surfaces and could also damage the technical
components of the unit.
Maintenance of the unit
The cooling circuit of the heat pump requires no regular
maintenance.
According to EU regulation (EC) 842/2006 of May 17,
2006, leak inspections and maintenance of a log book
are required for certain heat pumps!
The criteria for conducting leak inspections and
maintaining a log book are based on the hermetic
impermeability of the cooling circuit and the refrigerant
capacity of the heat pump! No log book is required for
heat pumps with a refrigerant capacity of < 3kg. With all
other heat pumps, the log book is included with all other
delivered materials.
Log book for heat pumps, Section “Information
on use of the log book”.
The components of the heating circuit and the heat
source (valves, expansion vessels, circulating pumps,
lters, dirt traps) should be inspected and cleaned
as needed - at the very least annually - by qualied
personnel (heating or cooling system tters).
It is best to arrange a maintenance agreement with a
heating installation company. The company will arrange
for the required maintenance at regular intervals.

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CLEANING AND FLUSHING OF UNIT COMPONENTS
CAUTION!
Unit components may be cleaned
and ushed only by customer service
personnel authorised by the manufacturer.
Use only liquids recommended by the
manufacturer.
Flushing of the liqueer with chemical
cleaning agents must be followed by
neutralisation of residue and intensive
ushing with water. Always observe the
technical data of the manufacturer of the
heat exchanger.
Malfunctions
In the event of a fault, you can read out the cause of the
fault from the diagnostic program of the heating and heat
pump regulator.
Operating manual of the heating and heat pump
regulator.
WARNING!
Only customer service personnel
authorised by the manufacturer may
carry out service and repair work on the
components of the unit.
Overview “Customer service”.
Scope of delivery
Example of scope of delivery:
Size 1:
As delivered:
1 Heat pump = complete indoor unit
2 Transport frame
3 Facing panels placed to the side (5 panels)
4 Insulation panel, which is then pushed under the
baseplate (sound insulation)
5 Pre-tted adjustable feet (4)
6 Spacer blocks (4), which can be unscrewed after
installation
7 Extra box with accessories (indoors)
8 Prole rails
Complete the following rst:
Check the delivery for outwardly visible signs of
damage…
Check that nothing is missing from the scope of
supply…
Any defects or incorrect deliveries must be
reported immediately.
NOTE.
Note the unit model.
Overview “Technical data / scope of delivery”.

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NIBETM AP-BW30 We reserve the right to make technical changes 83053706dUK – Translation of the operating manual
Installation
Observe the following when performing all work:
NOTE.
Always comply with the applicable local accident
prevention regulations, statutory regulations,
ordinances, guidelines and directives.
WARNING!
The heat pump or heat pump system
may only be installed and assembled by
qualied personnel!
NOTE.
Observe the sound levels of the respective
model.
Overview “Technical data / scope of delivery”,
“Sound” section.
INSTALLATION AREA
ATTE NTION
Install the heat pump only indoors.
The installation room must be frost-free and
dry.
WARNING!
Please note and follow the respective
relevant local standards, directives and
regulations applicable, especially the
minimum volume necessary depending
on the refrigerant capacity of the relevant
heat pump system (EN 378-1).
Refrigerant Limit
R 134a 0.25 kg/m³
R 404A 0.48 kg/m³
R 407C 0.31 kg/m³
R 410A 0.44 kg/m³
Overview “Technical data / scope of delivery”,
“General unit data” section.
Minimum volume = Refrigerant capacity [kg]
Limit [kg/m³]
NOTE.
If several heat pumps of the same type
are installed, only one heat pump must be
considered.
If several heat pumps of different types are
installed, the heat pump with the largest
refrigerant capacity must be considered.
TRANSPORT TO INSTALLATION LOCATION
Before transporting the heat pump to the nal
installation location the packaging and wooden
frame can be dismantled.
To do this, remove the facing panels on the long
sides, undo the wooden boards and remove the
two machine screws (M8) in each of the sides.
You can now lift the unit with the help of a pallet
truck or fork lift truck and transport it to its nal
installation location.
NOTE.
The unit has ground clearance for easy access
from all sides
NOTE.
The baseplate is 76 cm wide, so that the heat
pump can be transported through a standard
door opening.

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NOTE.
Keep the components enclosed in the scope of
delivery in a safe place until the assembly.
Always comply with the following safety information
during transport:
CAUTION!
Wear safety gloves.
WARNING!
Several people are required to transport
the unit. Do not underestimate the weight
of the unit.
Overview “Technical data / scope of delivery”,
“General unit data” section.
CAUTION!
Make sure to secure unit against slipping
during transport.
ATTE NTION
Never use components and hydraulic
connections on the unit for purposes of
transport.
Do not damage the hydraulic connections under
any circumstances.
ATTE NTION
Do not tilt the unit more than a maximum of 45°
(in any direction).
INSTALLATION
WARNING!
Several people are required to install the
unit.
NOTE.
Take into account the size of the unit.
Overview “Technical data / scope of delivery”,
“General unit data” section.
NOTE.
Always follow the installation plan for the
respective model. Note the size and minimum
clearances.
Installation plan for respective model.
ATTE NTION
The heat pump must be installed on a rm,
horizontal surface. Make sure that the foundation
is designed for the weight of the heat pump.
Do not use a rigid foam boiler pedestal!
Overview “Technical data/scope of delivery”,
“General unit data” section.
NOTE.
Set up the unit so that the operating side is
accessible at all times!
ATTE NTION
Do not tilt the unit more than a maximum of 45°
(in any direction).
Lower the basic heat pump module on the 4 wooden
transport blocks in its nal installation location.
Now use the vibration-decoupling, adjustable
machine feet to align the unit horizontally. Ensure
the distance from the nished oor level to the top
of the heat pump baseplate is 170 mm. Lock this
setting by locking the nuts.
The four transport blocks (each with 2 universal
wood screws) must then be removed.

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NIBETM AP-BW30 We reserve the right to make technical changes 83053706dUK – Translation of the operating manual
ATTE NTION
Connect the unit to the heating circuit according
to the hydraulic diagram for the respective
model.
“Hydraulic connection” instructions.
ATTE NTION
The heat source system must be designed
according to the specications of the planning
manual.
Planning manual and “Hydraulic connection”
documents.
NOTE:
Check to make sure that the diameters and
lengths of the pipes for the heating circuit and
the heat source are sufciently dimensioned.
NOTE:
Circulating pumps, which pump the volume ow
through the heat pump, must be designed as
multi-stage pumps. They must at least provide
the minimum throughput rate required for your
model.
In the case of heat source pumps, the viscosity of
the brine liquid must also be taken into account!
Overview “Technical data / scope of delivery”,
“Heat circuit” and “Heat source” sections.
ATTE NTION
The hydraulic system must be equipped with
a buffer tank, the required volume of which
depends on the model of your unit.
ATTE NTION
When installing the connections, always secure
the connections on the unit against twisting, in
order to prevent damage to the components
inside the unit.
Installation of the hydraulic
connections
BUFFER TANK
The hydraulic connection of the heat pump requires a
buffer tank in the heating circuit. The required volume
of the buffer tank is calculated based on the following
formula:
VBuffer tank = minimum ow rate of heat circuit volume ow / hour
10
For the minimum ow rate of the heat circuit
volume ow, see overview “Technical data/
Scope of delivery”, “Heating circuit” section.
DOMESTIC WATER HEATING
The domestic water heating with the heat pump requires
an additional hot water circuit, parallel to the heating
circuit. When installing, make sure that the domestic hot
water charge is not fed through the buffer tank of the
heating circuit.
“Hydraulic connection” instructions.
DOMESTIC HOT WATER TANK
If the heat pump is to be used for domestic water
heating, you must integrate special domestic hot water
tanks in the heat pump system. Choose a storage volume
so that the required quantity of hot water is available
even during a power cut.
NOTE:
The heat exchanger surface of the domestic hot
water tank must be dimensioned so that the
heating capacity of the heat pump is transferred
with minimum spread.
We offer a variety of domestic hot water tanks for you
to choose from. They are optimised for use with your
heat pump.

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The following steps are to be carried out on all 4
hydraulic connections of the heat pump:
Push the insulation elements included in the scope
of delivery onto the plate heat exchanger
Position the back panel of the heat pump on the
basic heat pump module
Connect the piece of pipe supplied to the threaded
ange and insulate it with the enclosed insulating
hose
Connect the connectors to the connection clip
included in the scope of supply to the corresponding
connection on the heat pump.
Use the insulating tape supplied to insulate the
connection clip. Use the enclosed fastening
materials to additionally x the insulation.
NOTE:
We recommend completing step after the
leak test.
NOTE:
The heat source and heating side must be
insulated from the heat pump; to this end we
recommend using the IPFK hydraulic connection
set in our range of products (not included in the
scope of delivery).
Install shut-off devices at the heating circuit.
Install shut-off devices at the heat source.
Place a bleeder at the highest point of the heat
source in the heat source outlet…
We recommend installing a dirt lter (screen size
0.9 mm) on the heat source inlet connection…
The hot water and heat source connections are
marked accordingly on the unit.
For the positioning of the connections, please
refer to the dimensioned drawing for the
respective model.

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INSTALLING THE HOUSING
NOTE.
Remove the protective lm from all facing panels.
NOTE.
The screws for installing the heat pump housing
are included in the scope of delivery.
Position the insulation included in the scope of
delivery under the baseplate.
NOTE.
Before screwing on the side panels, feed the patch
cable and + LIN bus cable through the rear panel!
see “electrical connection work”
Screw the two side panels onto the back panel using
3 screws for each:
Mount the prole rail onto the front of the unit,
between the two side panels, using 2 screws for
each side.
1 Prole rail
2 Screw
Align the facing with the baseplate as shown in the
following sketch
28
28
28
Secure and x the facing on the prole rail using the
fastening materials included in the scope of delivery
(2 x 10mm anchors and 2 x M8 hanger bolts). Twist
the hanger bolt into the oor up to the start of the
thread.
1 hanger bolt with anchor
Align the insulating board under the unit with the
middle of the unit (see ).
Fix the housing cover onto the rear panel (5 screws):
and the two side panels (2 screws each) onto the
front:

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The front panel can now be hung into the clips
provided at the bottom
and locked by means of the two quarter-turn
screws.
Glue the insulating half-shells included in the scope
of delivery around the pipe pieces in the rear panel.

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1 Electrical switch cabinet
Open the unit’s electrical switch cabinet:
Undo the 6 screws slightly, in order to unhook the
cover panel by lifting it slightly…
Several openings are provided at the back of the
unit for passing through the cables:
NOTE.
When laying the cable, ensure that unshielded
power supply cables and shielded cables (LIN
bus) are laid separately from each other.
NOTE.
LIN bus length may not be increased. However,
they can be shortened.
For further details, see “installation plan”
1 Electric cable penetration
2 Penetration, LIN bus and patch cable for
heatpump controller
Electrical connections
The following applies to all work to be done:
DANGER!
Risk of fatal injury due to electric shock!
All electrical connections must be carried
out by qualied electricians only.
Before opening the unit, disconnect the
system from the power supply and prevent
it from being switched back on!
WARNING!
During installation and while carrying out
electrical work, comply with the relevant
EN-, VDE and/or local safety regulations.
Comply with technical connection
requirements of the responsible power
supply company (if required by the latter)!
NOTE.
All cables must be fed through the openings in
the back panel!
The front panel is hung in at the bottom and is held
in place at the top by 2 quarter-turn screws.
1 Quarter-turn screws
Open the quarter-turn screws of the front panel by
turning them through 90° anticlockwise…
Lift out front panel and set aside in a safe place…

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The external electric cables to be provided must be fed
through the grommets cut out in the bottom of the rear
panel and then fed into the electrical switch cabinet by
means of the cable duct, which is integrated into the base-
plate of the heat pump.
1 Cable duct
The cables laid in the switch cabinet for the regulator
(patch cable, LIN bus) must be fed through the grommet
cut out in the bottom of the rear panel.
Make electrical connections according to the
terminal diagram…
“Terminal diagrams” for respective model.
CAUTION
Electrical connection work is only to be
carried out according to the terminal
diagram that applies to your model.
ATTE NTION
Ensure clockwise rotary eld of the load power
supply (compressor).
Operation with the incorrect rotary direction of
the compressor can cause serious, irreparable
damage to the compressor.
ATTE NTION
The power supply for the heat pump must be
equipped with an all-pole automatic circuit-
breaker with at least 3mm contact spacing to
IEC 60947-2.
Note the level of the tripping current.
Overview “Technical data / scope of delivery”,
“Electrics” section.
1 Control voltage connection
2 Compressor output connection
3 Regulator board
NOTE.
The control element of the heat and heat pump
regulator can be connected to a computer or
network using a suitable network cable, enabling
the heating and heat pump regulator to be
controlled remotely from there.
If such a connection is required, lay a shielded
network cable (category 6, with RJ-45
connector) up to the control element while
carrying out the electrical connection work.
After completion of all electrical installation work,
close the switch cabinet inside the unit.
Screw on the front panel of the unit if no further
installation work inside the unit is to be performed
immediately.

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Connection of patch cable and LIN bus cable to the
regulator (via the strain relief):
1 Patch cable to the network link
2 LIN bus to the regulator board in the unit
3 Patch cable to the regulator
board in the unit
If the work on the heat pump regulator has been
completed, the cover can be clipped onto the wall
bracket.
+=
NOTE.
A connection to a computer or a network can
be installed via the left bushing on the bottom
of the control element, thus allowing the heating
and heat pump regulator to be controlled
remotely. This requires that a shielded network
cable was laid up to the heat pump regulator
during the electrical connection work.
Operating manual for the heating and heat pump
regulator, version “Qualied heating engineers”,
“Web server” section.
NOTE.
The network cable can be exchanged at any
time. In order to be able to connect it, the
screen must rst be removed.
Flushing and lling the unit
ATTE NTION
The system must be absolutely free from air
before commissioning.
Installation of the control
element
NOTE.
Note the distance between the control element
and the unit.
For further details, see “installation plan”
Control element for wall-mounting
Fasten the wall bracket using the assembly materials
included in the scope of delivery.
There are 4 xing hooks on the back of the control
element.
Hang the control element on the wall bracket using
the 4 xing hooks and push down until it latches in-
to position.
1 Shielded terminal for LIN bus cable/strain relief
2 Strain relief

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Bleed the heat source.
FLUSHING AND FILLING THE HEATING CIRCUIT
WATER QUALITY OF THE FILL AND ADDITIONAL
WATER IN HOT WATER HEATING SYSTEMS ACCORDING
TO VDI 2035 PART I AND II
Use of modern, energy-efcient heat pump systems
is becoming increasingly widespread. Their ingenious
technology enables these systems to achieve very good
efciencies. The decreasing space available for heat
generators has led to the development of compact
units with increasingly smaller cross-sections and high
capacities. This means the complexity of the systems and
the material diversity are also increasing, which plays an
important role especially in their corrosion behaviour.
The heating water not only affects the efciency of the
system, but also the life of the heat generator and the
heating components of a system.
The guide values of VDI 2035 Part I and Part II must
therefore be complied with as minimum requirements
for proper operation of the systems. Our practical
experience has shown that the safest and most trouble-
free running of the systems is achieved with so-called
low-salt operation.
VDI 2035 Part I gives important information and
recommendations regarding scaling and its prevention in
heating and domestic hot water heating systems.
VDI 2035 Part II primarily deals with the requirements
for reducing heating water corrosion in hot water
heating systems.
PRINCIPLES OF PART I AND PART II
The occurrence of scaling and corrosion damage in hot
water heating systems is low, if
- proper planning and commissioning is carried out
- the system is closed in corrosion terms
- adequately dimensioned pressurising is integrated
- the guide values for the heating water are complied
with
- and regular servicing and maintenance are carried out.
FLUSHING AND FILLING THE HEAT SOURCE
Contamination and deposits in the heat source can cause
malfunctions.
ATTE NTION
Before ushing and lling the heat source the
drain pipe of the safety valve must be connected
Important: do not discharge into the drains
(anti-freeze mixture)!
NOTE.
Following antifreeze uids are approved for the
heat source circuit:
- Monopropylene Glycol
- Monoethylene Glycol
- Ethanol
- Methanol
ATTE NTION
With the use of (pipe-) materials, sealants and
ohter components, the compatibility of materials
with the antifreeze uids must be assured!
WARNING!
Methanol and ethanol emit ammable
and explosive gases. Furthermore, it is
important to always regard the saftey
regulations of antifreeze uids!
Proceed as follows:
Flush heat source system thoroughly.
Thoroughly mix the anti-freeze, available as an
accessory, with water with the required ratio.
Add only anti-freeze mixed with water to the heat
source.
ATTE NTION
The concentration of anti-freeze in the water
must be at the level specied for your model.
Overview “Technical data / scope of delivery”,
“Heat source” section.
Check the concentration of the anti-freeze in the
mixture…
Fill heat source with the anti-freeze mixture…

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NIBETM AP-BW30 We reserve the right to make technical changes 83053706dUK – Translation of the operating manual
A system log should be kept, in which the relevant
planning data is entered (VDI 2035).
DAMAGE THAT CAN OCCUR IN CASE OF NON-
COMPLIANCE
- Malfunctions and the failure of components (e.g. pumps,
valves)
- Internal and external leaks (e.g. from heat exchangers)
- Cross-section reduction and blockaging of components
(e.g. heat exchanger, pipes, pumps)
- Material fatigue
- Gas bubbles and gas cushion formation (cavitation)
- Negative effect on heat transfer (formation of coatings,
deposits) and associated noises (e.g. boiling noises,
ow noises)
LIMESCALE – THE ENERGY KILLER
Filling with untreated drinking water inevitably leads to
the precipitation of all calcium as scale. The consequence:
limescale deposits form on the heat transfer surfaces of
the heating. The efciency falls and the energy costs rise.
A rule of thumb is that 1 millimetre of limescale deposit
causes an energy loss of 10%. In extreme cases it can
even cause damage to the heat exchangers.
WATER SOFTENING TO VDI 2035 – PART I
If the water is softened before the heating is lled, in
accordance with the VDI 2035 guidelines, no scale
can form. This effectively and permanently prevents
limescale deposits and the resulting negative effects on
the entire heating system.
CORROSION – AN UNDERESTIMATED PROBLEM
VDI 2035, Part II, deals with the problem of corrosion.
Softening the heating water can prove to be insufcient.
The pH value can signicantly exceed the limit of 10.
pH values higher than 11 can set in, which even damage
rubber seals. The VDI 2035, Part 1 guidelines are
fullled, however, VDI 2035, Part 2 suggests a pH value
between 8.2 and maximum 10.
If aluminium materials are used, which is the case in
many modern heating systems, a pH value of 8.5 must
not be exceeded, because otherwise there is a threat
of corrosion – and aluminium is attacked without the
presence of oxygen. Therefore, apart from softening
the heating ll and additional water, the heating water
should also be appropriately conditioned. This is the
only way to comply with the VDI 2035 requirements and
the recommendations and installation instructions of the
heat pump manufacturer.
Part 2 of VDI 2035 also points out the reduction in total
salt content (conductivity). The risk of corrosion is far
lower if deionised water is used than is the case if the
system is operated with salty, i.e. softened water.
Even if the water has been softened beforehand, it
contains dissolved, corrosion-promoting salts, which act
as electrolytes due to the use of different materials in
the heating system and therefore accelerate corrosion
processes. This can ultimately result in pitting.
ON THE SAFE SIDE WITH LOW-SALT OPERATION
The problems listed above do not occur at all with
low-salt operation, as neither corrosive salts such as
sulphates, chlorides and nitrates nor alkalising sodium
hydrogen carbonate are in the heating water. The
corrosive properties of deionised water are very low
and in addition, fur cannot form in the boiler. This is the
ideal approach for closed heating circuits, in particular,
because low oxygen input into the heating circuit can
also be tolerated.
In general, when the system is lled with deionised
water, the pH value sets itself within the ideal range due
to „self-alkalinisation“. If necessary, a pH value of 8.2
can be very easily alkalised by adding chemicals. In this
way, optimum protection of the entire heating system is
achieved.
MONITORING
Analytical recording and monitoring of the relevant
water values and the added active conditioning
substances is of decisive importance. Therefore, they
should be monitored regularly using appropriate water
test equipment.
ATTE NTION
Before ushing and lling the heating circuit, the
drain pipe of the safety valve must be connected.
Flush heating circuit system thoroughly.
Fill heating circuit…
Bleed heating circuit.

19
We reserve the right to make technical changes 83053706dUK – Translation of the operating manual NIBETM AP-BW30
Insulating the hydraulic
connections
NOTE.
Insulate the heating circuit and the heat source
according to relevant local standards and
guidelines.
Check all hydraulic connections for leaks. Perform
leak test…
Insulate all connections, vibration isolation,
connections and pipes of the heating circuit and the
heat source. Insulate the heat source so that it is
vapour-diffusion tight.
Commissioning
Thoroughly check the installation and work through
the items on the general checklist…
“General checklist”.
The installation inspection will prevent damage
to the heat pump system that could be caused by
improperly executed work.
Ensure that…
•the clockwise rotary eld of the load power
supply (compressor) is ensured.
•The heat pump installation and assembly is
according to the requirements in this operating
manual.
•The electrical installation work has been carried
out properly.
•The power supply for the heat pump must be
equipped with a three-phase automatic circuit-
breaker with at least 3mm contact spacing to IEC
60947-2. Note the level of the tripping current.
•The heating circuit and the heat source are
ushed, lled and bled thoroughly.
•All valves and shut-off devices of the heating
circuit are open.
•All valves and shut-off devices of the heat source
are open.
•All pipe systems and components of the system
are sealed.
Carefully ll out and sign the completion report for
heat pump systems…
The heat pump system will be commissioned by
customer service personnel authorized by the
manufacturer. There is a fee for commissioning!
Dismantling
DANGER!
Risk of fatal injury due to electric shock!
Electrical connections may be installed
only by qualied electricians.
Before opening the unit, disconnect the
system from the power supply and prevent
it from being switched back on!
WARNING!
Only qualied heating or cooling system
personnel are allowed to remove the unit
from the system and dismantle the unit.
ATTE NTION
The anti-freeze mixture of the heat source must
not be allowed to enter the sewer system.
Collect anti-freeze mixture and dispose of
properly.
ATTE NTION
Recycle or ensure proper disposal of unit
components, refrigerants and oil according
to the relevant regulations, standards and
guidelines.
REMOVAL OF THE BUFFER BATTERY
ATTE NTION
Before scrapping the heating and heat pump
regulator, remove the buffer battery on the
processor board. The battery can be pushed
out using a screwdriver. Dispose of battery and
electronic components in an environmentally
friendly way.

20
NIBETM AP-BW30 We reserve the right to make technical changes 83053706dUK – Translation of the operating manual
Device designation
Heat pump type Brine/Water ı Air/Water ı Water/Water • relevant ı — not relevant
Installation location Indoors ı Outdoors • relevant ı — not relevant
Conformity CE
Power data Heating power/COP at
B0/W35 Standard point as per EN14511 2 Compressors
1 Compressor
kW ı …
kW ı …
B0/W45 Standard point as per EN14511 2 Compressors
1 Compressor
kW ı …
kW ı …
B7/W35 Standard point as per EN14511 2 Compressors
1 Compressor
kW ı …
kW ı …
B0/W50 Standard point as per EN14511 2 Compressors
1 Compressor
kW ı …
kW ı …
Operating limits Heat circuit °C
Heat source °C
Additional operating points …
Noise Sound pressure level at 1m gap around the machine averaged (in free field) dB(A)
Sound power level as per EN12102 dB
Heat source Volumetric flow: minimum throughput ı nominal throughput ı maximum throughput l/h
Pressure loss in heat pump ∆p ı Volumetric flow bar ı l/h
Recommended brine circulating pump …
Total compression of the recommended pump at nominal brine volumetric flow bar ı l/h
Antifreeze Monoethylene glycol
Minimum concentration ı frostproof to % ı °C
Heat circuit Volumetric flow: minimum throughput ı nominal throughput ı maximum throughput l/h
Pressure loss in heat pump ∆p ı Volumetric flow bar ı l/h
Free compression of heat pump ∆p ı Volumetric flow bar ı l/h
Temperature spread for B0/W35 K
General device data Earth (see dimensional diagram for the size indicated) Size
Total weight kg
Extra weight of construction unit 1 kg
Extra weight of construction unit 2 kg
Connections Heat circuit …
Heat source …
Refrigerant Refrigerant type ı Filling capacity … ı kg
Electrics Voltage code ı All-pole circuit breaker for pump *) … ı A
Voltage code ı Control voltage circuit breaker *) … ı A
Voltage code ı Electrical heating element circuit breaker *) ı A
Heat pump Effect.power consumption in the normal point B0/W35 as per EN255: Power consumption. ı .Current consumption ı cosφ kW ı A ı …
Maximum machine current within the operating limits A
Starting current: direct ı with slow-starter A ı A
Protection type IP
Power of electrical heating element 3 ı 2 ı 1-phase kW ı kW ı kW
Components Circulating pump for heat circuit at nominal throughput: Power consumption ı Current consumption kW ı A
Circulating pump for heat source at nominal throughput: Power consumption ı Current consumption kW ı A
Setting range for motor protection switch of heat source circulating pump A
Passive cooling function Data only for devices with ID K: Cooling power at nominal volumetric flow rates (15 °C heat source, 25 °C hot water) kW
Safety devices Safety assembly for heat circuit ı Safety assembly for heat source in scope of supply: • yes — no
Heating and heat pump control in scope of supply: • yes — no
Electronic soft-starter integrated: • yes — no
Expansion vessels Heat source: Scope of supply ı Volume ı Supply pressure • yes — no ı l ı bar
Heat circuit: Scope of supply ı Volume ı Supply pressure • yes — no ı l ı bar
Overflow valve integrated: • yes — no
Vibration isolation Heat circuit ı Heat source in scope of supply: • yes — no
UK813198a
*) Observe local regulations n.n. = cannot be demonstrated
Technical data / scope of delivery