Viessmann VITOCAL 151-A Quick guide

Installation and service instructions
for contractors
VIESMANN
Vitocal 151-A
Type AWOT(-M)-E-AC/AWOT(-M)-E-AC-AF 151.A
Air source heat pump, monoblock version for heating and cooling operation, with
1 integrated heating/cooling circuit
VITOCAL 151-A
6171817 GB 11/2021 Please keep safe.

2
Please follow these safety instruc-
tions closely to prevent accidents
and material losses.
Safety instructions explained
Danger
This symbol warns against the risk
of injury.
!Please note
This symbol warns against the risk
of material losses and environmen-
tal pollution.
Note
Details identified by the word "Note"
contain additional information.
The outdoor unit contains easily flamma-
ble refrigerant in safety group A3
according to ISO 817 and
ANSI/ASHRAE Standard 34.
Target group
These instructions are exclusively inten-
ded for qualified contractors.
■Work on the refrigerant circuit with
flammable refrigerant in safety group
A3 may only be carried out by author-
ised heating contractors. These heat-
ing contractors must be trained in
accordance with EN 378 Part 4 or
IEC 60335-2-40, Section HH. The cer-
tificate of competence from an industry
accredited body.
■Brazing/soldering work on the refriger-
ant circuit may only be carried out by
contractors certified in accordance with
ISO 13585 and AD 2000, Datasheet
HP 100R. And only by contractors
qualified and certified for the processes
to be carried out. The work must fall
within the range of applications pur-
chased and be carried out in accord-
ance with the prescribed procedures.
Soldering/brazing work on accumulator
connections requires certification of
personnel and processes by a notified
body according to the Pressure Equip-
ment Directive (2014/68/EU).
■Work on electrical equipment may only
be carried out by a qualified electrician.
■Before initial commissioning, all safety-
relevant points must be checked by the
particular certified heating contractors.
The system must be commissioned by
the system installer or a qualified per-
son authorised by the installer.
Safety instructions
Safety instructions
6171817

3
Regulations to be observed
■National installation regulations
■Statutory regulations for the prevention
of accidents
■Statutory regulations for environmental
protection
■Statutory requirements for pressure
equipment:
Pressure Equipment Directive
2014/68/EU
■Codes of practice of the relevant trade
associations
■Relevant country-specific safety regu-
lations
■Applicable regulations and guidelines
for operation, service, maintenance,
repair and safety of cooling, air condi-
tioning and heat pump systems con-
taining flammable and explosive refrig-
erant.
Safety instructions for working on the system
The outdoor unit contains flammable
refrigerant R290 (propane C3H8). If
there is a leak, the escaping refrigerant
may form a flammable or explosive
atmosphere in the ambient air. A safety
zone is defined in the immediate vicinity
of the outdoor unit, in which special
rules apply when working on the appli-
ance.
Working in the safety zone
Danger
Risk of explosion: Escaping refrig-
erant may form a flammable or
explosive atmosphere in the ambi-
ent air.
Take the following measures to pre-
vent fire and explosion in the safety
zone:
■Keep ignition sources away, e.g. naked
flames, hot surfaces, electrical devices
not free of ignition sources, mobile
devices with integrated batteries (e.g.
mobile phones, fitness watches, etc.).
■Permissible tools:
All tools for working in the safety zone
must be designed and explosion pro-
tected in accordance with the applica-
ble standards and regulations for
refrigerant in safety groups A2L and
A3, e.g. brushless machines (cordless
screwdrivers), extraction equipment,
disposal containers, installation aids,
vacuum pumps, conductive hoses,
mechanical tools of non-sparking
material, etc.
Note
The tools must also be suitable for the
pressure ranges in use.
Tools must be in perfect maintenance
condition.
■The electrical equipment must meet
the requirements for areas at risk of
explosion, zone 2.
■Do not use flammable materials, e.g.
sprays or other flammable gases.
■Discharge static: Before beginning
work, touch earthed objects, such as
heating or water pipes.
Safety instructions
Safety instructions (cont.)
6171817

4
■Do not remove, block or bridge safety
equipment.
■Do not make any changes:
Do not modify the outdoor unit, inlet/
outlet lines, electrical connections/
cables or the surroundings. Do not
remove any components or seals.
Working on the system
■Switch off the power supply to the
indoor unit and outdoor unit, e.g. at a
separate fuse or mains isolator. Check
that the system is no longer live.
Note
In addition to the control circuit there
may be several power circuits.
Danger
Contact with live components can
result in severe injuries. Some
components on PCBs remain live
even after the power supply has
been switched off.
Prior to removing covers from the
appliances, wait at least 4 minutes
until the voltage has completely
dropped out.
■Safeguard the system against recon-
nection.
■Wear suitable personal protective
equipment when carrying out any work.
Danger
Hot surfaces and fluids can result in
burns or scalding. Cold surfaces
may cause frostbite.
■Prior to servicing or maintenance
tasks, switch off and allow the
equipment to cool down or warm
up.
■Do not touch hot or cold surfaces
on the appliance, fittings or pipe-
work.
!Please note
Electronic assemblies can be dam-
aged by electrostatic discharge.
Before beginning work, touch
earthed objects, such as heating or
water pipes, to discharge any static.
Work on the refrigerant circuit
R290 refrigerant (propane) is an air dis-
placing, colourless, flammable, odour-
less gas which forms explosive mixtures
with air.
Refrigerant drained must be properly
disposed of by authorised contractors.
Perform the following measures before
beginning work on the refrigerant circuit:
■Check the refrigerant circuit for leaks.
■Ensure very good ventilation especially
in the floor area and sustain this for the
duration of the work.
■Secure the area surrounding the work
area.
■Inform the following persons of the
type of work to be carried out:
–All maintenance personnel
–All persons in the vicinity of the sys-
tem.
■Inspect the area immediately around
the heat pump for flammable materials
and ignition sources:
Remove all flammable materials and
ignition sources.
■Before, during and after the work,
check the surrounding area for escap-
ing refrigerant using an explosion-proof
refrigerant detector suitable for R290.
This refrigerant detector must not gen-
erate any sparks and must be suitably
sealed.
Safety instructions
Safety instructions (cont.)
6171817

5
■A CO2 or powder extinguisher must be
to hand in the following cases:
–Refrigerant is being drained.
–Refrigerant is being topped up.
–Soldering or welding work is being
carried out.
■Display signs prohibiting smoking.
Danger
Escaping refrigerant can lead to fire
and explosions that result in very
serious injuries or death.
■Do not drill or apply heat to a
refrigerant circuit filled with refrig-
erant.
■Do not operate Schrader valves
unless a fill valve or extraction
equipment is attached.
■Take measures to prevent electro-
static charge.
■No smoking! Prevent naked
flames and sparks. Never switch
lights or electrical appliances on
or off.
■Components that contain or con-
tained refrigerant must be label-
led, and stored and transported in
well ventilated areas in accord-
ance with the applicable regula-
tions and standards.
Danger
Direct contact with liquid and gas-
eous refrigerant can cause serious
damage to health, e.g. frostbite
and/or burns. There is a risk of
asphyxiation if it is breathed in.
■Prevent direct contact with liquid
and gaseous refrigerant.
■Wear personal protective equip-
ment when handling liquid and
gaseous refrigerant.
■Never breathe in refrigerant
vapours.
Danger
Refrigerant is under pressure:
Mechanical loading of lines and
components can cause leaks in the
refrigerant circuit.
Do not apply loads to the lines and
components, e.g. by supporting or
placing tools.
Danger
Hot and cold metallic surfaces of
the refrigerant circuit may cause
burns or frostbite if skin contact is
made.
Wear personal protective equip-
ment to protect against burns or
frostbite.
!Please note
When refrigerant is being removed,
hydraulic components may freeze.
Drain heating water from the heat
pump beforehand.
Danger
Damage to the refrigerant circuit
can cause refrigerant to enter the
hydraulic system.
After completion of the work, vent
the hydraulic system correctly.
When doing so, ensure the area is
sufficiently ventilated.
Safety instructions
Safety instructions (cont.)
6171817

6
Installation
Frost protection
!Please note
Freezing can cause damage to the
heat pump.
■Thermally insulate all the
hydraulic lines.
■In order to activate the frost pro-
tection function, electrically con-
nect the heat pump before filling
the secondary circuit. Switch on
the power supply. Switch on the
ON/OFF switch on the indoor unit.
■Only fill the secondary circuit with
suitable fill water in accordance
with VDI 2035, not with media
containing antifreeze.
Connecting cables
Danger
With short electrical cables, should
there be leakage in the refrigerant
circuit, gaseous refrigerant may
reach the inside of the building.
Min. length of the electrical con-
necting cables between the indoor
and the outdoor unit: 3 m
Repair work
!Please note
Repairing components that fulfil a
safety function can compromise the
safe operation of the system.
■Replace faulty components only
with genuine Viessmann spare
parts.
■Do not undertake any repairs on
the inverter. Replace the inverter if
there is a defect.
Auxiliary components, spare and
wearing parts
!Please note
Spare and wearing parts that have
not been tested together with the
system can compromise its func-
tion. Installing non-authorised com-
ponents and making non-approved
modifications or conversions can
compromise safety and may invalid-
ate our warranty.
For replacements, use only original
spare parts supplied or approved by
Viessmann.
Safety instructions
Safety instructions (cont.)
6171817

7
Safety instructions for operating the system
What to do if refrigerant escapes
Danger
Escaping refrigerant can lead to fire
and explosions that result in very
serious injuries or death. There is a
risk of asphyxiation if it is breathed
in.
■Ensure very good ventilation
especially in the floor area of the
outdoor unit.
■No smoking! Prevent naked
flames and sparks. Never switch
lights or electrical appliances on
or off.
■Evacuate any people from the
danger zone.
■From a safe position, switch off
the electricity supply for all system
components.
■Remove ignition sources from the
danger zone.
■Let the system user know that no
ignition source may be brought
into the danger zone for the dura-
tion of the repair.
■Repair work must be carried out
by an authorised contractor.
■Only recommission the system
after it has been repaired.
Danger
Direct contact with liquid and gas-
eous refrigerant can cause serious
damage to health, e.g. frostbite
and/or burns. There is a risk of
asphyxiation if it is breathed in.
■Prevent direct contact with liquid
and gaseous refrigerant.
■Never breathe in refrigerant
vapours.
If water escapes from the appliance
Danger
If water escapes from the appliance
there is a risk of electric shock.
Switch off the heating system at the
external isolator (e.g. fuse box,
domestic distribution board).
Danger
If water escapes from the appli-
ance, there is a risk of scalding.
Never touch hot heating water.
What to do if the outdoor unit ices up
!Please note
A build-up of ice in the condensate
pan and in the fan area of the out-
door unit can cause damage to the
equipment.
Please note the following:
■Do not use mechanical items/aids for
the removal of ice.
■Before using electrical heating applian-
ces, check the refrigerant circuit for
leaks with a suitable measuring device.
–The heating appliance should not be
a source of ignition.
–The heating appliance must meet the
requirements of EN 60335-2-30.
■If ice regularly builds up on the outdoor
unit (e.g. in areas where frost and
heavy fog occur frequently), install fan
ring heating (accessories) that is suita-
ble for refrigerant R290 and/or an elec-
tric ribbon heater in the condensate
pan (accessories or factory-fitted).
Safety instructions
Safety instructions (cont.)
6171817

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Safety instructions for storage of the outdoor unit
The outdoor unit is charged at the fac-
tory with refrigerant R290 (propane).
Danger
Escaping refrigerant can lead to fire
and explosions that result in very
serious injuries or death. There is a
risk of asphyxiation if it is breathed
in.
Store the outdoor unit in the follow-
ing conditions:
■An explosion prevention plan must be
in place for storage.
■Ensure there is sufficient ventilation at
the storage location.
■Temperature range for storage: –25 °C
to 70 °C
■Only store the outdoor unit in its ex-
factory protective packaging.
■Protect the outdoor unit against dam-
age.
■The maximum number of outdoor units
that may be stored in one place is
determined by local conditions.
Safety instructions
Safety instructions (cont.)
6171817

9
1. Information Disposal of packaging ............................................................................ 12
Symbols ................................................................................................. 12
Intended use .......................................................................................... 12
Product information ................................................................................ 13
■Layout and functions .......................................................................... 13
■System examples ............................................................................... 14
■Spare parts lists .................................................................................. 14
2. Preparing for installation Requirements for on-site connections ................................................... 15
■Outdoor unit ........................................................................................ 16
3. Installation sequence Installing the outdoor unit ....................................................................... 17
■Transport ............................................................................................ 17
■Installation information ........................................................................ 19
■Installation location ............................................................................. 21
■Minimum clearances ........................................................................... 24
■Draining condensate via a soakaway ................................................. 24
■Draining condensate via waste water system .................................... 25
■Floorstanding installation .................................................................... 25
■Wall mounting ..................................................................................... 29
■Connecting the hydraulic connection lines ......................................... 30
■Checking the transport bracket ........................................................... 31
Positioning the indoor unit ..................................................................... 32
■Transport ............................................................................................ 32
■Requirements for the installation room ............................................... 32
■Minimum clearances ........................................................................... 34
■Minimum room height ......................................................................... 34
■Pressure points ................................................................................... 35
■Relocating the ON/OFF switch ........................................................... 35
Connecting the secondary circuit ........................................................... 36
■Preparing connections on the heating water side ............................... 36
■Preparing the connections on the DHW side ...................................... 36
■Connecting the secondary side .......................................................... 37
■Aligning the indoor unit ....................................................................... 39
■Temperature limiter ............................................................................. 39
■Contact humidistat .............................................................................. 40
■Operation without outdoor unit ........................................................... 40
Indoor unit: Removing the front panels .................................................. 41
Electrical connection .............................................................................. 42
■Preparing the electrical connections ................................................... 42
■Overview of electrical terminal areas .................................................. 43
■Opening electrical terminal areas ....................................................... 43
■Indoor unit: Routing cables to the terminal area ................................. 45
■Notes regarding the connection values .............................................. 46
■Upper PCB: Bus connections and sensors ........................................ 47
■Bottom PCB: 230 V~ function components and digital inputs ............ 49
■HPMU electronics module: Accessory 230 V~ and BUS connection . 51
■Integrating a heat pump into a CAN bus system ................................ 53
■Outdoor unit: Electrical terminal area on the underside of the appli-
ance .................................................................................................... 55
■Indoor/outdoor unit CAN bus communication cable (accessories) ..... 55
■Fitting the programming unit ............................................................... 57
Power supply ......................................................................................... 58
■Central power supply for types ... SP ................................................. 58
■Heat pump control unit power supply ................................................. 59
■Instantaneous heating water heater power supply ............................. 60
■Compressor power supply: Outdoor unit 230 V~ ................................ 61
■Compressor power supply: Outdoor unit 400 V~ ................................ 62
■Power supply with power-OFF: Without on-site load disconnect ....... 63
Index
Index
6171817

10
■Power supply with power-OFF: With on-site load disconnect ............ 64
■Mains power supply in conjunction with self-consumption ................. 65
Closing the indoor unit ........................................................................... 65
■Indoor unit: Fitting the front panel ....................................................... 66
4. Commissioning, inspec-
tion, maintenance
Steps - commissioning, inspection and maintenance ............................ 67
5. Troubleshooting Message display on the programming unit ............................................ 94
Fault messages ..................................................................................... 95
Warning messages ................................................................................ 113
Further messages .................................................................................. 117
■Service messages .............................................................................. 117
■Status messages ................................................................................ 117
■Information .......................................................................................... 118
6. Indoor unit maintenance Overview of electrical terminal areas .....................................................121
Removing the programming unit and electronics module ......................121
■Removing the HMI programming unit ................................................. 121
■Removing the HPMU electronics module .......................................... 121
■Removing the EHCU electronics module ........................................... 122
Overview of internal components .......................................................... 124
Draining indoor unit on the secondary side ........................................... 124
Removing hydraulic components and EPP insulating parts .................. 124
■Overview of torque settings for assembly ...........................................125
■Removing the expansion vessel ......................................................... 126
■Removing the instantaneous heating water heater ............................ 127
■Removing the sensors ........................................................................ 129
■Removing the circulation pump head ................................................. 132
Status display, internal circulation pump ................................................132
Checking the temperature sensors ........................................................133
■Viessmann NTC 10 kΩ (blue marking) ............................................... 134
Checking the pressure sensors ............................................................. 135
Checking the fuse .................................................................................. 135
7. Outdoor unit maintenance Overview of electrical components ........................................................ 136
Checklist for maintenance work .............................................................136
Overview of internal components .......................................................... 141
Refrigerant circuit flowchart ................................................................... 143
■Heating mode ..................................................................................... 143
■Cooling mode ..................................................................................... 144
Extracting the refrigerant ....................................................................... 145
Testing pressure resistance ................................................................... 146
Filling the refrigerant circuit ....................................................................146
Draining the outdoor unit on the secondary side ................................... 147
Removing the hydraulic components .....................................................148
■Removing the float air vent valve with quick-action air vent valve ......148
■Removing the ball valve with filter ...................................................... 149
Checking the temperature sensors ........................................................150
■NTC 10 kΩ (no marking) .....................................................................151
Checking the pressure sensors ............................................................. 152
Checking the fuses ................................................................................ 152
8. Commissioning/service
reports
................................................................................................................153
9. Specification ................................................................................................................154
10. Appendix Commissioning order .............................................................................164
Final decommissioning and disposal ..................................................... 164
Index
Index
6171817

11
11. Certificates Declaration of conformity ....................................................................... 166
12. Keyword index ................................................................................................................167
Index
Index (cont.)
6171817

12
Please dispose of packaging waste in line with statu-
tory regulations.
Symbols
Symbols in these instructions
Symbol Meaning
Reference to other document containing
further information
1.
Step in a diagram:
The numbers correspond to the order in
which the steps are carried out.
Warning of material losses and environ-
mental pollution
Live electrical area
Pay particular attention.
■Component must audibly click into place.
or
■Acoustic signal
■Fit new component.
or
■In conjunction with a tool: Clean the sur-
face.
Dispose of component correctly.
Dispose of component at a suitable collec-
tion point. Do not dispose of component in
domestic waste.
The steps in connection with commissioning, inspec-
tion and maintenance are found in the "Commission-
ing, inspection and maintenance" section and identified
as follows:
Symbol Meaning
Steps required during commissioning
Not required during commissioning
Steps required during inspection
Not required during inspection
Steps required during maintenance
Not required during maintenance
Symbols on the heat pump
Symbol Meaning
Warning of flammable materials
(ISO 7010 - W021)
Observe the operating manual
(ISO 7000 - 0790)
Observe the instructions for use/operating
instructions (ISO 7000 - 1641)
Service indicator:
Refer to the operating manual
(ISO 7000 - 1659)
Intended use
The appliance is only intended to be installed and
operated in sealed unvented heating systems that
comply with EN 12828, with due attention paid to the
associated installation, service and operating instruc-
tions.
Depending on the version, the appliance can only be
used for the following purposes:
■Central heating
■Central cooling
■DHW heating
The range of functions can be extended with additional
components and accessories.
Information
Disposal of packaging
6171817
Information

13
Intended use presupposes that a fixed installation in
conjunction with permissible, system-specific compo-
nents has been carried out.
Commercial or industrial usage for a purpose other
than central heating/cooling or DHW heating shall be
deemed inappropriate.
Incorrect usage or operation of the appliance (e.g. the
appliance being opened by the system user) is prohibi-
ted and will result in an exclusion of liability. Incorrect
usage also occurs if the components in the heating
system are modified from their intended function.
Note
The appliance is intended exclusively for domestic or
semi-domestic use, i.e. even users who have not had
any instruction are able to operate the appliance
safely.
Product information
Layout and functions
Vitocal 151-A is a monoblock air source heat pump,
comprising 1 indoor unit with integral DHW cylinder
and 1 outdoor unit.
Refrigerant circuit
The refrigerant circuit works with refrigerant R290 (pro-
pane).
All components of the refrigerant circuit are located in
the outdoor unit, including the refrigerant circuit con-
troller with 2 electronic expansion valves. Subject to
operating conditions, compressor output is matched
via inverter control.
To provide room cooling, there is an electronically con-
trolled reversal of the refrigerant flow direction within
the refrigerant circuit.
Hydraulics
The indoor and outdoor units are connected to each
other hydraulically.
The hydraulic components for room heating and cool-
ing are located in the indoor unit. 1 high efficiency cir-
culation pump is installed to supply the heating/cooling
circuits.
Switching between room heating, DHW heating and
defrosting is done with the integrated 4/3-way valve.
The heat required to defrost the evaporator is provided
by the integrated buffer cylinder in the indoor unit. The
overflow valve function to guarantee the minimum sys-
tem volume flow rate is also achieved via the 4/3-way
valve.
System without heating water buffer cylinder
The heat pump heats or cools 1 heating/cooling circuit
without mixer.
The flow temperature is controlled by modulating the
heat pump.
System with external heating water buffer cylinder
The heat pump heats up to 4 heating circuits: 1 heat-
ing circuit without mixer and up to 3 heating circuits
with mixer
DHW cylinder
A 190 l DHW cylinder is integrated in the indoor unit.
Instantaneous heating water heater
In the indoor unit, an instantaneous heating water
heater is built into the heating water flow from the out-
door unit. This instantaneous heating water heater
supports the heat pump in room heating and/or DHW
heating if the heating output of the heat pump is insuffi-
cient under certain conditions. In power-OFF mode or
a fault in the heat pump, this instantaneous heating
water heater can also be switched on as the sole heat
source, e.g. for frost protection of the system, including
the outdoor unit.
Heat pump control unit
The heat pump control unit built into the indoor unit
monitors and regulates the entire heating system.
The indoor and outdoor units communicate via CAN
bus.
Information
Intended use (cont.)
6171817
Information

14
Type plate
A
Fig. 1
AType plate and QR code for appliance registration
The QR code with designation "i" contains the
access data for the registration and product informa-
tion portal. This allows e.g. the 16-digit serial number
to be read out via the QR-Code.
Type overview
Type Heating/cooling cir-
cuits
Rated voltage Central in-
door unit
power sup-
ply
Conden-
sate pan
heating
Internal
hydraul-
ics
External
buffer cylin-
der
AWOT-E-AC 151.A 1 1 to 4 230 V~ 400 V~/
230 V~
400 V~ — —
AWOT-M-E-AC 151.A 1 1 to 4 230 V~ 400 V~/
230 V~
230 V~ — —
AWOT-M-E-AC 151.A SP 1 1 to 4 230 V~ 230 V~ 230 V~ X —
AWOT-E-AC-AF 151.A 1 1 to 4 230 V~ 400 V~/
230 V~
400 V~ —X
AWOT-M-E-AC-AF 151.A 1 1 to 4 230 V~ 400 V~/
230 V~
230 V~ —X
AWOT-M-E-AC-AF 151.A SP 1 1 to 4 230 V~ 230 V~ 230 V~ X X
Control unit/PCB, indoor unit
Outdoor unit
Instantaneous heating water heater
System examples
Available system examples: See
www.viessmann-schemes.com.
Spare parts lists
Information about spare parts can be found at
www.viessmann.com/etapp or in the Viessmann
spare part app.
Information
Product information (cont.)
6171817
Information

15
A B C D E F
B
C
D
E
FA
B
C
D
E
47
597
600
687
697
1397
1473
1556
1666
1748
1831
1900
1946
1951
86
163
245
355
438
520
AF
Fig. 2
ASecondary circuit flow (heating/cooling circuit 1 /
heating water buffer cylinder), connection Cu 28 x
1.0 mm
BCold water, connection Cu 22 x 1.0 mm
COutdoor unit flow (indoor unit heating water inlet),
connection Cu 28 x 1.0 mm
DOutdoor unit return (indoor unit heating water out-
let), connection Cu 28 x 1.0 mm
EDHW, connection Cu 22 x 1.0 mm
FSecondary circuit return (heating/cooling circuit 1/
heating water buffer cylinder), connection Cu 28 x
1.0 mm
Preparing for installation
Requirements for on-site connections
6171817
Installation

16
Outdoor unit
600
1382
60
600
558
104
221
926
418
88
390
451
526
40
A
B
C
D
E
1144
705
A C DBE
Fig. 3
AOutdoor unit flow (heating water outlet): Plug-in
connection for Cu 28 x 1.0 mm
BOutdoor unit return (heating water inlet): Plug-in
connection for Cu 28 x 1.0 mm
CPower cable plug
DCAN bus communication cable plug (accessories)
ECondensate drain
Preparing for installation
Requirements for on-site connections (cont.)
6171817
Installation

17
Transport
Danger
The outdoor unit is filled with refrigerant R290
(propane): Mechanical loading can lead to leaks
in the refrigerant circuit. Where leaks of refriger-
ant occur, there is the risk of explosion or
asphyxiation.
■Prevent vibration during transport.
■Position the outdoor unit carefully after trans-
port.
■When being transported, protect the evapora-
tor on the rear side of the outdoor unit against
mechanical loading, e.g. with cardboard pack-
aging or bubble wrap.
■Equipment damaged in transit should not be
used.
!Please note
Shock, pressure and tensile loads can damage
the equipment.
■Do not load the appliance top, front and side
panels as well as the evaporator on the rear
side of the equipment.
■In order to avoid damage to the air outlet grill,
always fit the sack truck to the rear side of the
outdoor unit.
Do not damage the evaporator when doing so.
!Please note
Scratches on the surface coating will lead to cor-
rosion.
■Only remove the packaging from the outdoor
unit after transporting.
■Protect the outdoor unit against direct contact
with tools and transporting equipment, e.g.
using cardboard packaging or bubble wrap.
!Please note
Excessive tilting of the outdoor unit will lead to
equipment damage.
■Max. tilting angle: 45°
■Following transport, wait at least 30 min before
commissioning.
Handling using transport aids
Danger
If the transport aids are damaged, the outdoor
unit may fall. Should damage to the refrigerant
circuit occur, there is the risk of explosion or
asphyxiation.
■Check transport aids for damage before han-
dling.
■Note the weight of the outdoor unit: See chap-
ter "Weight of outdoor units".
Use the transport aids to lift and transport the outdoor
unit. Wear protective gloves.
The transport aids are each found in the mounting rail
under the outdoor unit. Because of the uneven weight
distribution, there are 4 transport aids on the right-
hand mounting rail.
Installation sequence
Installing the outdoor unit
6171817
Installation

18
2.
6x
6x
A
1.
Fig. 4
ATransport aid
Installation sequence
Installing the outdoor unit (cont.)
6171817
Installation

19
Removing the transport aids
After handling, remove all transport aids.
3. 6x
1.
2.
4x 4x
Fig. 5
Installation information
Floorstanding installation
Particularly in adverse climatic environments (minus
temperatures, snow and humidity) a distance to the
substrate of at least 300 mm is required.
■Secure the outdoor unit with supports for floorstand-
ing installation (accessories) onto a concrete founda-
tion.
Use ground anchors with a tensile force of at least
2.5 kN to secure the support to the foundation.
■If the supports cannot be used, site the outdoor unit
on a concrete foundation ≥ 250 mm high using anti-
vibration feet (accessories).
If the outdoor unit is installed under a snow-free awn-
ing, (e.g. a carport) a lower plinth can be used.
■Take into account the weight of the outdoor unit: See
chapter "Weight of outdoor units".
Wall mounting
■Use the wall mounting bracket set (accessories).
■The wall must meet the structural requirements.
Use suitable fixing materials, depending on the wall
structure.
Flat roof installation
Note
Due to the higher static loads (roof/wind load) and the
higher acoustic requirements for flat roof installation,
the structural calculations and sound concept require
input from specialist design engineers.
Installation sequence
Installing the outdoor unit (cont.)
6171817
Installation

20
If the outdoor unit is to be installed on a flat roof, in
addition to the requirements for floor and wall installa-
tion, the following planning measures to be taken into
account include:
■As the outdoor unit is located higher up when instal-
led on a flat roof, operating noise propagation is
more intense than when the unit is installed on the
ground. Roof surfaces are normally more reverber-
ant than areas on the ground.
To prevent noise nuisance, install the outdoor unit at
a sufficient distance from neighbouring buildings. If
required, provide suitable noise reduction measures.
Take into account sound reflection from the surfaces
of buildings when analysing sound propagation: See
technical guide.
■Provide on-site wind protection measures if required,
e.g. screens, walls, etc.
■Check to ensure that the installed height of the out-
door unit does not exceed the permissible building
height, e.g. as specified in outline planning restric-
tions.
■Provide easy, year-round access to the outdoor unit
for service and maintenance. Provide sufficient main-
tenance areas.
Install suitable protection equipment, e.g. anchorage
points.
■We recommend installing the heat pump on a steel-
reinforced concrete ceiling.
■Installation on flat roofs with a low weight per unit
area (e.g. roofs made from timber rafters or trapezoi-
dal sheet metal) is not permissible.
■With flat roof installation, considerable wind loads
may occur, depending on the relevant wind zone and
the height of the building. Have the substructure
designed according to DIN 1991-1-4 by a specialist
design engineer.
■The higher roof and wind loads must be taken into
account in the structural calculations and the fixture
system of the outdoor unit.
Siting
■In accordance with EN 378-3:2016, the outdoor unit
should only be installed in the open air.
■The refrigerant circuit in the outdoor unit contains
easily flammable refrigerant in safety group A3
according to ANSI/ASHRAE Standard 34.
Therefore a safety zone is defined in the immediate
vicinity of the outdoor unit, in which special require-
ments apply: See chapter "Safety zone".
■Observe the information regarding noise levels.
Sound emission regulations (TA-Lärm in Germany)
must be observed.
■When siting the heat pump, always take into account
the distances to neighbouring properties in accord-
ance with local building regulations.
■Do not install with the discharge side facing towards
the house wall or the main wind direction.
■During defrosting, cool vapour escapes from the out-
door unit air discharge vents. This vapour discharge
must be taken into consideration during installation
(choosing the installation location, orientation of the
heat pump).
■Provide wall outlets and protective conduits for the
hydraulic connection lines and electrical connecting
cables without moulded parts or changes of direc-
tion.
All wall outlets must be made gas-tight. This also
includes wall outlets that lie below ground level in
the safety zone.
■Provide equipment for the protection of the outdoor
unit against mechanical damage e.g. Impact damage
from footballs.
■Take environmental and weather influences into
account in the selection of the installation location,
e.g. flooding, wind, snow, ice damage, etc. Install
suitable protection equipment if required.
Siting in garages, multi-storey car parks and car
parking areas:
■Prior to installation, it must be established for the
case in question whether the installation is permissi-
ble under local garage and parking area regulations
(German regulations GaStellV, GaStplVO, BetrVO).
■Provide systems with refrigerants in safety group A3
with impact protection. This impact protection must
be designed so that a strike by a vehicle at the appli-
cable maximum speed does not result in damage to
the refrigerant circuit.
■Mark the outdoor unit safety zone with prohibition
notices to identify ignition sources.
■Siting in underground car parks is not permissible.
Siting in coastal areas: Distance < 1000 m
■In coastal areas salt and sand particles in the air
increase the likelihood of corrosion:
Site the heat pump where it is protected from direct
onshore wind.
■If required, provide a wind break on site. Observe the
minimum clearances to the heat pump: See the fol-
lowing chapter.
Weather influences
■Observe wind loads when installing the unit on sites
exposed to the wind.
■Fit the pipework exposed to the outdoor air outside
the support for floorstanding installation (accesso-
ries) with adequately thick thermal insulation in
accordance with the German Buildings Energy Act
(GEG): See the following table.
Pipework inter-
nal 7
Min. thickness of thermal insu-
lation layer with
λ = 0.035 W/(m·K)
≤ 22 mm 40 mm
> 22 mm 60 mm
λThermal conductivity
Installation sequence
Installing the outdoor unit (cont.)
6171817
Installation