STIEBEL ELTRON HPA-O 05.1 CS Premium Specification sheet

OPERATION AND INSTALLATION
Air source heat pump
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CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������3
1.1 Relevant documents_____________________________________________ 3
1.2 Safety instructions_______________________________________________ 3
1.3 Other symbols in this documentation _______________________ 4
1.4 Information on the unit_________________________________________ 4
1.5 Units of measurement __________________________________________ 4
1.6 Standardised output data ______________________________________ 4
2. Safety����������������������������������������������������������4
2.1 Intended use______________________________________________________ 4
2.2 General safety instructions ____________________________________ 4
3. Appliance description ���������������������������������������5
3.1 Minimum software versions___________________________________ 5
3.2 Properties _________________________________________________________ 5
3.3 Function ___________________________________________________________ 5
4. Settings �������������������������������������������������������5
5. Maintenance and care ���������������������������������������6
6. Troubleshooting ����������������������������������������������6
INSTALLATION
7. Safety����������������������������������������������������������7
7.1 General safety instructions ____________________________________ 7
7.2 Instructions, standards and regulations ____________________ 7
8. Appliance description ���������������������������������������7
8.1 Accessories________________________________________________________ 7
9. Preparation ���������������������������������������������������7
9.1 Sound emissions_________________________________________________ 7
9.2 Safety clearances as required by the safety concept _____ 8
9.3 Minimum clearances____________________________________________ 9
9.4 Preparing the installation location__________________________ 10
9.5 Installing the supply lines_____________________________________ 10
9.6 Siting ______________________________________________________________ 10
9.7 WPM heat pump manager ____________________________________ 13
9.8 Buffer cylinders _________________________________________________ 14
9.9 Preparing the electrical installation ________________________ 14
10. Installation�������������������������������������������������� 15
10.1 Transport _________________________________________________________ 15
10.2 Heating water connection_____________________________________ 15
10.3 Flow and return connection __________________________________ 15
10.4 Fitting the push-fit connectors_______________________________ 15
10.5 Oxygen diffusion________________________________________________ 16
10.6 Filling the heating system ____________________________________ 16
10.7 Condensate drain _______________________________________________ 18
10.8 External second heat generator _____________________________ 18
10.9 High limit safety cut-out for area heating system________ 18
11. Electrical connection��������������������������������������� 18
11.1 Terminal area____________________________________________________ 18
11.2 Ribbon heater ___________________________________________________ 21
12. Commissioning ��������������������������������������������� 21
12.1 Checks before commissioning________________________________ 21
12.2 Using the appliance with an external second heat
generator_________________________________________________________ 22
12.3 Ensuring a minimum flow rate ______________________________ 22
13. Settings ����������������������������������������������������� 23
13.1 Activating spread control _____________________________________ 23
13.2 Heating curve adjustment ____________________________________ 24
13.3 Reduced night mode (Silent mode) _________________________ 24
13.4 Other settings ___________________________________________________ 25
14. Appliance handover���������������������������������������� 25
15. Appliance shutdown ��������������������������������������� 25
15.1 Standby mode ___________________________________________________ 25
15.2 Power interruption _____________________________________________ 25
16. Maintenance ������������������������������������������������ 25
17. Troubleshooting �������������������������������������������� 26
17.1 Checking the IWS DIP switch settings ______________________ 26
17.2 Light emitting diodes (LEDs)__________________________________ 27
17.3 Reset button _____________________________________________________ 27
17.4 Resetting the high limit safety cut-out _____________________ 28
17.5 Fan noise _________________________________________________________ 28
18. Specification ������������������������������������������������ 29
18.1 Dimensions and connections _________________________________ 29
18.2 Wiring diagram _________________________________________________ 30
18.3 Application limit ________________________________________________ 32
18.4 Output diagrams ________________________________________________ 33
18.5 Data table ________________________________________________________ 36
GUARANTEE
ENVIRONMENT AND RECYCLING

SPECIAL INFORMATION
General information
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SPECIAL INFORMATION
- The appliance may be used by children aged8
and older and persons with reduced physical,
sensory or mental capabilities or a lack of ex-
perience and know-how, provided that they
are supervised or they have been instructed
on how to use the appliance safely and have
understood the potential risks. Children must
never play with the appliance. Cleaning and
user maintenance must not be carried out by
children without supervision.
- The connection to the power supply must
be in the form of a permanent connection.
Ensure the appliance can be separated from
the power supply by an isolator that discon-
nects all poles with at least 3mm contact
separation.
- Maintain the minimum clearances to ensure
trouble-free operation of the appliance and
facilitate maintenance work.
- Only qualified contractors may perform main-
tenance work, such as electrical safety checks.
- We recommend regular inspection (to es-
tablish the current condition of the system),
and maintenance by a qualified contractor if
required (to return the system to its original
condition).
- Following disconnection from the power sup-
ply, parts of the appliance may remain ener-
gised for 2minutes until the inverter capaci-
tors have discharged.
- Never interrupt the power supply, even out-
side the heating season. The system's active
frost protection is not guaranteed if the power
supply is interrupted.
- If the heat pump is completely switched OFF
and there is a risk of frost, drain the system
on the water side.
OPERATION
1. General information
The chapters "Special information" and "Operation" are intended
for both users and qualified contractors.
The chapter "Installation" is intended for qualified contractors.
Note
Read these instructions carefully before using the appli-
ance and retain them for future reference.
Pass on these instructions to a new user if required.
1.1 Relevant documents
Instructions for the WPM heat pump manager
Operating and installation instructions for system
components
Appliance commissioning checklist
1.2 Safety instructions
1.2.1 Structure of safety instructions
!
KEYWORD Type of risk
Here, possible consequences are listed that may result
from failure to observe the safety instructions.
f Steps to prevent the risk are listed.
1.2.2 Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
1.2.3 Keywords
KEYWORD Meaning
DANGER Failure to observe this information will result in serious
injury or death.
WARNING Failure to observe this information may result in serious
injury or death.
CAUTION Failure to observe this information may result in non-seri-
ous or minor injury.
!

OPERATION
Safety
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1.3 Other symbols in this documentation
Note
General information is identified by the adjacent symbol.
f Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
Appliance disposal
f This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
1.4 Information on the unit
Symbol Meaning
Refrigerant with low flammability
1.5 Units of measurement
Note
All measurements are given in mm unless stated oth-
erwise.
1.6 Standardised output data
Information on determining and interpreting the specified stand-
ardised output data.
1.6.1 EN 14511
The output data specifically mentioned in texts, diagrams and
technical datasheets has been calculated according to the test
conditions of the standard shown in the heading of this section.
However, there is a deviation from this norm in the output data for
air/water inverter heat pumps at source temperatures of > -7°C,
as this concerns partial load values. The associated percentage
weighting in the partial load range can be found in EN14825 and
EHPA quality label regulations.
Generally, the test conditions stated above will not fully match the
conditions found at the installation site of the system user.
Depending on the chosen test method and the extent to which
this method differs from the test conditions defined in the first
paragraph of this section, any deviations can be considerable.
Additional factors that have an influence on the test values are the
measuring equipment, the system configuration, the age of the
system and the flow rates.
Confirmation of the specified output data can only be obtained if
the test conducted for this purpose is also performed in accord-
ance with the test conditions defined in the first paragraph of this
section.
2. Safety
2.1 Intended use
Observe the application limits listed in chapter "Specification /
Data table".
The appliance is intended for domestic use. It can be used safely
by untrained persons. The appliance can also be used in non-do-
mestic environments, e.g. in small businesses, as long as it is
used in the same way.
Any other use beyond that described shall be deemed inappropri-
ate. Observation of these instructions and of instructions for any
accessories used is also part of the correct use of this appliance.
2.2 General safety instructions
Observe the following safety instructions and regulations.
- Only qualified contractors may carry out the electrical work
and installation of this appliance.
- The qualified contractor is responsible for adherence
to all applicable regulations during installation and
commissioning.
- The appliance should only be operated once it is fully in-
stalled and all safety equipment has been fitted.
- Protect the appliance from dust and dirt during building
work.
!
WARNING Injury
The appliance may be used by children over 8 years of
age and persons with reduced physical, sensory or men-
tal capabilities or a lack of experience and expertise,
provided that they are supervised or they have been
instructed on how to use the appliance safely and have
understood the potential risks. Children must never play
with the appliance. Cleaning and user maintenance must
not be carried out by children without supervision.
!
WARNING Injury
f For safety reasons, only operate the appliance with
the casing closed.
!

OPERATION
Appliance description
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3. Appliance description
3.1 Minimum software versions
The following minimum software versions are necessary for op-
eration of the heat pump:
- WPM: 449.05
- FES: 502.03
3.2 Properties
This appliance is an air source heat pump designed for outdoor
installation. Heat is extracted from the outdoor air at a low tem-
perature level, and is then transferred to the heating water at a
higher temperature. The heating water can be heated to a flow
temperature of up to 75°C.
The appliance is equipped with an electric emergency/booster
heater (NHZ). To safeguard heating operation and the provision
of high DHW temperatures, the electric emergency/booster heat-
er is activated as an emergency heater if the dual mode point is
undershot in mono mode operation. If the same thing happens in
mono energetic operation, the electric emergency/booster heater
is activated as a booster heater.
This appliance has further operational characteristics:
- Suitable for underfloor and radiator heating systems.
- It will continue to extract heat from outdoor air even at an
outside temperature of -25°C.
- Corrosion-protected, external casing made from hot-dipped
galvanised sheet steel plus stove-enamelled finish.
- Comprises all components and safety equipment required for
operation.
- One element of the safety concept is a safety valve built into
the appliance. In the event of a leak, this safety valve pre-
vents refrigerant from entering the heating circuit.
Note
For centralised control of the heating system, you would
need the WPM heat pump manager.
3.3 Function
3.3.1 Heating
Heat is extracted from the outdoor air via the heat exchanger
(evaporator) on the air side. The evaporated refrigerant is com-
pressed by a compressor. This process requires electrical ener-
gy. At this point, the refrigerant is at a higher temperature level.
A further heat exchanger (condenser) transfers the heat to the
heating circuit. The refrigerant then expands again and the cycle
restarts from the beginning.
At air temperatures below approx. 7°C, the humidity in the air
condenses as hoarfrost on the evaporator fins. This hoarfrost is
automatically defrosted. Water created by this defrosting process
collects in the defrost pan and is drained off.
!
Material losses
During the defrost cycle, the fan is switched OFF and
the heat pump circuit is reversed. The heat required for
defrosting is drawn from the buffer cylinder. For opera-
tion without a buffer cylinder, observe chapter "Menu/
Menu description/ SETTINGS/ HEATING/ STANDARD
SETTING/ BUFFER OPERATION" in the WPM installation
instructions. Otherwise the heating water freezes under
unfavourable conditions.
The heat pump automatically reverts to heating mode at the end
of the defrost cycle.
Material losses
In dual mode operation, return water from the second
heat generator may flow through the heat pump. Please
note that the return temperature must be no higher than
65°C.
3.3.2 Cooling
Material losses
The heat pump is not suitable for continuous, year-round
cooling.
f Observe the application limits (see chapter “Specifi-
cation/ Data table”).
Material losses
In cooling mode, condensate can form when the dew
point temperature is undershot.
f Take suitable measures to prevent the formation of
condensate.
Rooms are cooled by reversing the heat pump circuit. Heat is
extracted from the heating water and the evaporator transfers
this heat to the outdoor air.
Area cooling and fan cooling require the installation of a remote
control unit (FET) in a reference room to capture the relative hu-
midity and the room temperature as part of dew point monitoring.
With fan cooling, it is also necessary to install a buffer cylinder.
Heat pump application limit
The heat pump is switched OFF if the outside temperature falls
below the selected lower application limit for cooling (LIMITCOOL-
ING parameter).
4. Settings
The system is operated exclusively via the WPM heat pump man-
ager.
f Please observe the instructions for the heat pump manager.

OPERATION
Maintenance and care
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5. Maintenance and care
Material losses
Only qualified contractors may perform maintenance
work, such as electrical safety checks.
A damp cloth is sufficient for cleaning all plastic and sheet metal
parts. Never use abrasive or corrosive cleaning agents.
Regularly check the condensate drain (visual inspection). Remove
any contaminants and blockages immediately.
1.
2.
1
D0000037831
1 Inspection port
Material losses
Keep the air discharge and intake apertures free from
snow and leaves.
Remove any leaves or other foreign bodies from the evaporator
fins periodically.
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance by a qualified contractor
as required (to restore the system to the ideal condition).
6. Troubleshooting
Fault Cause Remedy
There is no hot
water or the
heating system
remains cold.
No power at the appliance. Check the fuses/ MCBs in
your fuse box/ distribution
board. Replace the fuses/
reset the MCBs if required.
Notify your qualified
contractor if the fuses/
MCBs blow/trip again after
switching the system back
on.
Water is leaking
from the appli-
ance.
The condensate drain may be
blocked.
Clean the condensate drain
as described in "Mainte-
nance and care".
The heater gets
warm, but the
rooms are not
heated to the
required temper-
ature.
The dual mode temperature is
set too low.
Increase the dual mode
temperature to e.g. 0°C.
The building is a new build
and is in the screed drying
phase.
Increase the dual mode
temperature to +5°C.
After 1 to 2 years the dual
mode temperature can be
reset to e.g. -3°C.
Fault Cause Remedy
There is a loss of
pressure in the
heating system.
Water drips from the safety
valve.
Use the inspection port
to check whether water
is passing from the safety
valve hose into the conden-
sate pan. Call your quali-
fied contractor.
Condensate is
collecting on the
outside of the
appliance.
The heat pump extracts heat
from the outdoor air in order
to heat the building. This can
cause the humidity in the
outdoor air to accumulate as
dew or frost on the cooled
heat pump casing. This is not
a defect.
The fan runs
when the
compressor is
switched OFF.
At outside temperatures below
10°C, the fan is regularly
started at the lowest speed
when the compressor is idle.
This prevents the evaporator
and fan from freezing or icing
up due to water draining
off. At temperatures above
the freezing point, the time
between two defrost cycles is
increased, thereby improving
overall efficiency.
The appliance
produces rhyth-
mic scraping or
grinding noises.
Ice has formed on the air
grille, on the fan blades or in
the air routing.
Call your qualified contrac-
tor (see chapter "Installa-
tion/ Troubleshooting/ Fan
noise").
Note
Even when the condensate is draining away correctly, it
is not unusual for water to drip from the appliance onto
the floor.
If you cannot remedy the fault, contact your qualified contractor.
To facilitate and speed up your request, provide the number from
the type plate. The type plate is located at the front top, on the
right or left-hand side of the casing.
Sample type plate
Montageanweisung beachten! Dichtheit geprüft! Made in Germany
*xxxxxxxxxxxxxxxxxx*
D0000107757
1
1 Number on the type plate

INSTALLATION
Safety
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INSTALLATION
7. Safety
Only a qualified contractor should carry out installation, commis-
sioning, maintenance and repair of the appliance.
7.1 General safety instructions
We guarantee trouble-free function and operational reliability only
if original accessories and spare parts intended for the appliance
are used.
7.2 Instructions, standards and regulations
Note
Observe all applicable national and regional regulations
and instructions.
The appliance conforms to IEC 61000-3-12.
The appliance meets the specified standard, as long as it is oper-
ated in accordance with EN61000-3-11:2000 para.4a.
8. Appliance description
The appliance offers frost protection for the connection lines. The
integral frost protection circuit starts the circulation pump in the
heat pump circuit automatically at a condenser temperature of
8°C, and thereby ensures circulation in all water-carrying sec-
tions. If the temperature inside the buffer cylinder drops, the heat
pump starts automatically no later than when the temperature
falls below +5°C.
8.1 Accessories
8.1.1 Required accessories
- Heat pump manager WPM
8.1.2 Additional accessories
- Hydraulic module HM(S)
- Hydraulic module HM(S) Trend
- Integral cylinders HSBC 200 (S)(GB)(BE)
- Integral cylinders HSBC 300 cool
- Cylinder and hydraulic module HSBB 200 (S)(GB)(BE)
- Remote control FET
- Remote control FE7
- Ribbon heater HZB 1
- Ribbon heater HZB 2
- High limit safety cut-out for
area heating system
STB-FB
- Heating circuit pump UP 25/7.5 PCV
- T-support SK 1
- Wall mounting bracket WK 2
- Mounting bracket MK 1
- Connection set AS-WP 1
- Connection set AS-WP 2
9. Preparation
!
D0000060163
The appliance is designed for siting in front of a wall. Observe the
minimum clearances. If the appliance is installed in an open space
or on a roof, protect the air intake side. Do this by erecting a wall
to shield it against the wind.
9.1 Sound emissions
The appliance is louder on the air intake and air discharge sides
than on the two enclosed sides. Take the following information
into account when selecting the installation location.
Note
For details regarding the sound power level, see chapter
"Specification / Data table".
- Lawn areas and shrubs help reduce the spread of noise.
- Noise propagation can also be reduced through dense pali-
sades or similar.
f Ensure that the entire appliance frame is in full contact with
the substrate. Uneven substrates can increase sound emis-
sions.
f Ensure that the air intake direction is the same as the main
wind direction. Air should not be drawn in against the wind.
f Ensure that the air intake and air discharge are never direct-
ed towards noise-sensitive rooms of the house, e.g.bed-
rooms, or neighbouring houses.
f Avoid installation on large, echoing floor areas, e.g.tiled
floors.
f Avoid installation between reflective building walls. Reflect-
ing building walls can increase the noise level.

INSTALLATION
Preparation
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9.2 Safety clearances as required by the safety
concept
!
WARNING Injury
Refrigerant is heavier than air. In the case of leaks, es-
caping refrigerant can enter rooms beneath the instal-
lation site through open windows. If refrigerant escapes
from the appliance, it sinks and displaces the air. There
is risk of suffocation.
f Install the appliance at an adequate distance from
light wells.
f Ensure that the appliance is not installed in front of or above
supply air, extract air or other ventilation equipment.
In order to comply with the appliance's safety concept, safety
clearances to light wells must be observed.
Installation on foundation, light well at ground level
≥1000
≥1000
D0000091448
f Ensure that the minimum clearances to light wells are ob-
served.
Installation on foundation, light well above ground level
≥100≥100
≥150
D0000093454
f Ensure that the minimum clearances to light wells are ob-
served.
Installation on a mounting bracket
Note
The safety clearances to the light wells apply to the fol-
lowing mounting brackets:
- MK1 mounting bracket
- T-support SK1
- Wall mounting support
WK 2
≥1000 ≥1000
D0000091931
≥1000 ≥1000
≥150
D0000093526
f Ensure that the minimum clearances to light wells are ob-
served.

INSTALLATION
Preparation
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9.3 Minimum clearances
Note
f If the appliance is installed close to light wells, it is
essential that you observed the safety clearances to
those light wells (see chapter "Safety clearances as
required by the safety concept").
≥2000
≥500
≥300
≥1000
≥800
D0000028299
f Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
D0000096921
f Never install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
!
Material losses
Please note that both the flow of outdoor air into the
appliance, and the flow of exhaust air from the appliance
must be unimpeded.
If the air intake and discharge of the appliance are ob-
structed by surrounding objects, this may cause a thermal
short circuit.
9.3.1 Minimum clearances with cascades
≥500 ≥500
≥1000
D0000078118
≥300
≥300
D0000078119
≥300 ≥300
≥250≥250
1
2
2
D0000078120
3
1 Main wind direction
2 Air discharge
3 Wall or wind protection

INSTALLATION
Preparation
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9.3.2 Installation in coastal areas
1
3
4
2
>500 m
D0000088568
1 Main wind direction
2 Building, wall or wind protection
3 Appliance
4 Air discharge
f Ensure that the air intake direction is the same as the main
wind direction. If the main wind direction is from the sea (>
2% salinity), ensure that the installation is at least 500m
from the sea.
9.4 Preparing the installation location
!
WARNING Injury
The discharged cold air can cause condensation to be
formed in the vicinity of the air discharge.
f Ensure that no risk of slipping due to wet conditions
or ice formation occurs on adjacent footpaths and
driveways at low temperatures.
f Observe chapter "Sound emissions".
f Ensure that the appliance is not installed in front of or above
supply air, extract air or other ventilation equipment.
f Ensure that the appliance is accessible from all sides.
f Ensure that the substrate is level, even, solid and permanent.
f Ensure that the appliance is installed no more than 4m
above a safety valve. The appliance is equipped with a safety
valve with a response pressure of 2.5bar (see chapter “Fill-
ing the heating system/ Safety concept”).
f Provide a recess (space) in the base to enable supply lines to
be routed into the appliance from below.
9.5 Installing the supply lines
!
WARNING Injury
f Seal all supply line entries into the building to en-
sure that they are watertight.
The supply lines are all electric cables plus the flow and return
lines.
f Also protect all supply lines against humidity, damage and
UV radiation by means of a conduit.
f Use only weatherproof cables, e.g. NYY.
f Protect the flow and return lines against frost with sufficient
thermal insulation. The thermal insulation must be at least
twice as thick as the diameter of the pipe. Provide thermal
insulation in accordance with applicable regulations.
f Protect all pipe fixings and external wall ducts with anti-vi-
bration insulation.
Note
When routing the condensate hose, observe chapter "In-
stallation/ Condensate drain".
9.6 Siting
f When siting the appliance, observe the air discharge direc-
tion.
f Position the appliance on the prepared substrate or on a
suitable support.
9.6.1 Installation on foundation or MK 1 mounting bracket
Note
Allow the conduits for the supply lines to protrude slightly
above the foundations. Ensure that no water can enter
the conduits.
Foundations with recess
750
A
100
410
200
75
140
4
5
1
3
2
D0000034133
A 1300
1 Air intake
2 Air discharge
3 Main wind direction
4 Supply line recess
5 Condensate drain recess (minimum diameter 70mm)
f Ensure that the foundations offer the necessary recess.

INSTALLATION
Preparation
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Installation on foundations
4
12
5
AB
C
3
D0000028297
A 100
B 300
C Depth of frost line
1 Heating flow
2 Heating return
3 Condensate drain conduit
4 Foundation
5 Gravel bed
Note
To secure the appliance against toppling over, it can also
be fixed to the foundations with screws.
f Use the accessories with which the appliance was
secured to the transport pallet.
D0000064201
f Hook two brackets respectively into the lateral slots on the
front and back. Ensure you are using the correct brackets for
the left and right hand slots respectively.
f Position the brackets so that the groove on the bracket is
hooked into the appliance.
f Secure the appliance to the foundations using the brackets
and suitable rawl plugs and screws. Do not use the screws
with which the appliance was secured to the transport pallet.
MK1 mounting bracket
Note
The mounting bracket cannot be used in combination
with the connection sets (AS-WP1 and AS-WP2).
7
6
1
A
8
3
12
4
5
B
D0000060818
A Depth of frost line
B 245
1 Heating flow
2 Heating return
3 Conduit for supply line
4 Foundation
5 Mounting bracket
6 Gravel bed
7 Condensate drain conduit
8 Condensate drain

INSTALLATION
Preparation
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9.6.2 Installation on strip foundation
Strip foundation
B
C
A
1
3
2100100
D0000063486
A 1160
B 650
C 490
1 Air intake side
2 Air discharge side
3 Main wind direction
f Erect a strip foundation at ground level.
f Lay the condensate drain pipe.
f Fill in with gravel up to the top edge of the strip foundation.
Installation on strip foundation
12
6
A
B
5
4
3
D0000100623
A 300
B Depth of frost line
1 Heating flow
2 Heating return
3 Strip foundation (edge block)
4 Rubble
5 Condensate drain conduit
6 Gravel bed
Note
To secure the appliance against toppling over, it can also
be fixed to the foundations with screws.
f Use the accessories with which the appliance was
secured to the transport pallet.
D0000064201
f Hook two brackets respectively into the lateral slots on the
front and back. Ensure you are using the correct brackets for
the left and right hand slots respectively.
f Position the brackets so that the groove on the bracket is
hooked into the appliance.
f Secure the appliance to the foundations using the brackets
and suitable rawl plugs and screws. Do not use the screws
with which the appliance was secured to the transport pallet.

INSTALLATION
Preparation
www.stiebel-eltron.com HPA-O 05.1-07.1 CS Premium|13
9.6.3 T-support SK1
Note
f Install a ribbon heater when mounting on the wall
bracket or T-support (see chapter "Electrical connec-
tion/ Ribbon heater").
A
B
8
5
7
3
4
2
1
6
9
10
C
D0000050006
A Depth of frost line
B 300
C 1160
1 Heating flow
2 Heating return
3 Conduit for supply line
4 Foundation
5 T-support
6 Gravel bed
7 Condensate drain conduit
8 Condensate drain
9 Ribbon heater
10 Cover
f Observe the structural limits of the T-support used.
f See the dimensioned connection drawing for the correct
spacing between holes (see chapter "Specification/ Dimen-
sions and connections").
9.6.4 Wall mounting support WK 2
Note
f Install a ribbon heater when mounting on the wall
bracket or T-support (see chapter "Electrical connec-
tion/ Ribbon heater").
Note
To prevent disturbance due to structure-borne noise
transmission, never install the wall mounting bracket on
the external walls of living areas or bedrooms.
f Install the wall mounting bracket on a garage wall,
for example.
≥300
1
2
3
5
6
4
A
D0000058719
A 1160
1 Heating flow
2 Heating return
3 Condensate drain
4 Ribbon heater
5 Condensate drain conduit
6 Wall mounting bracket
f Observe the structural limits of the wall mounting bracket
used.
f See the dimensioned connection drawing for the correct
spacing between holes (see chapter "Specification/ Dimen-
sions and connections").
9.7 WPM heat pump manager
A WPM heat pump manager is required to operate the appliance.
This controls the entire heating system.
f Observe the WPM installation instructions during installation.

INSTALLATION
Preparation
14|HPA-O 05.1-07.1 CS Premium www.stiebel-eltron.com
9.8 Buffer cylinders
!
Material losses
A buffer cylinder with diffusion-proof insulation is essen-
tial to enable cooling by means of fan convectors.
Note
If cooling is provided via an area heating system, the
buffer cylinder is not required.
We recommend the use of a buffer cylinder to ensure trouble-free
appliance operation.
The buffer cylinder provides hydraulic separation of the volume
flows in the heat pump circuit and heating circuit, and also serves
as an energy source for defrosting.
f If operating without a buffer cylinder, observe the details
in the chapter “Commissioning/ Ensuring a minimum flow
rate”.
9.9 Preparing the electrical installation
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with national and regional regulations.
WARNING Electrocution
The connection to the power supply must be in the form
of a permanent connection. Ensure the appliance can be
separated from the power supply by an isolator that dis-
connects all poles with at least 3mm contact separation.
This requirement can be met by contactors, isolators,
fuses, etc.
Material losses
The specified voltage must match the mains power sup-
ply. Observe the type plate.
Material losses
Provide separate fuses/MCBs for the three power circuits,
i.e. those of the appliance, the control unit and the elec-
tricemergency/booster heater.
Note
The appliance includes an inverter for the variable speed
compressor. In the event of an error, inverters can cause
DC residual currents. If RCDs are provided, they must be
type B AC/DC-sensitive.
A DC residual current can block type A RCDs.
f Ensure that the appliance power supply is discon-
nected from the distribution board.
The electrical data can be found in the chapter "Specification".
You require a screened J-Y (St) 2x2x0.8mm² cable as a bus cable.
f Use cables with the relevant cross-sections. Observe the ap-
plicable national and regional regulations.
Fuse protec-
tion
Assignment Cable cross-section
1x B 25A Compressor ≥ 2.5 mm²
Alternatively:
1x B 16 A Compressor ≥ 2.5 mm²
further details
below table
2x B 16 A Electric emergen-
cy/auxiliary heater
2.5mm²
1x B 16 A Control unit 1.5mm²
You can safeguard the compressor using the alternative, smaller
fuse protection.
f If you have selected a lower fuse protection for the compres-
sor, you will need to limit the maximum power consumption.
In the COMMISSIONING/ COMPRESSOR menu, adjust the-
MAXIMUM CURRENT parameter. Observe the information in
the commissioning instructions for the heat pump manager.
Output reduction in the case of 16A compressor fuse
protection
If you select 16A fuse protection, at flow temperatures below
55°C, the output is not reduced. At flow temperatures above 55°C
and the specified outside temperatures, the output is reduced.
Source temperature Flow temperature Output reduction
[°C] [°C] [%]
HPA-O 07.1 CS Premium
765 11
75 19
265 11
75 21
-7 75 4

INSTALLATION
Installation
www.stiebel-eltron.com HPA-O 05.1-07.1 CS Premium|15
10. Installation
Note
The device is designed in such a way that it can be po-
sitioned and connected without removing the cover or
side panels.
10.1 Transport
f When transporting the appliance, be aware of its centre of
gravity.
- The centre of gravity is in the area where the compressor is
located.
f Protect the appliance against heavy impact during transport.
f Use the recessed grips provided at the sides.
D0000071298
- If the appliance needs to be tilted during transport, this must
only be for a short time and it must only be tilted on one of
its longitudinal sides. When transporting the appliance, en-
sure the compressor is on the upper appliance side.
- The longer the appliance is tilted, the greater the distribution
of refrigerant oil inside the system.
f Wait approximately 30minutes before starting the appliance
after it has been tilted.
10.2 Heating water connection
!
Material losses
The heating system to which the heat pump is connected
must be installed by a qualified contractor in accordance
with the water installation drawings that are part of the
technical guide.
To facilitate connection to the heating system, push-fit connectors
are enclosed with the appliance (see chapter "Fitting the push-fit
connectors").
Vibration decoupling with flexible hoses is already implemented
in the unit.
f Before connecting the heat pump, flush the pipework thor-
oughly with suitable water. Foreign bodies, such as welding
pearls, rust, sand or sealant can impair the operational relia-
bility of the heat pump.
f When sizing the heating circuit, observe the internal pressure
differential (see chapter "Specification/ Data table").
10.3 Flow and return connection
Material losses
In cooling mode, condensate can form when the dew
point temperature is undershot.
f Take suitable measures to prevent the formation of
condensate.
26_03_01_1871
2
1
3
4
1 Heating flow
2 Heating return
3 Drain
4 Ventilation
f Connect the heat pump to the heating circuit. Check for tight-
ness.
f Ensure that the heating flow and return are connected cor-
rectly.
f Provide thermal insulation in accordance with applicable
regulations.
10.4 Fitting the push-fit connectors
Note
The plastic push-fit connectors are not suitable for instal-
lation in the DHW line or the solar circuit.
f Install the push-fit connectors only in the heating
circuit.
!Material losses
Tighten the screw cap of the push-fit connector by hand.
Never use a tool.
!
Material losses
To ensure the push-fit connector is held securely, pipes
with a surface hardness >225HV (e.g. stainless steel)
must have a groove.
f Using a pipe cutter, cut a groove (depth ap-
prox.0.1mm) at a defined distance from the end of
the pipe.
- Pipe diameter 22mm: 17±0.5mm
- Pipe diameter 28mm: 21±0.5mm
How the push-fit connectors work
The push-fit connectors are equipped with a retainer with stain-
less steel serrations and an O-ring for sealing. The push-fit con-

INSTALLATION
Installation
16|HPA-O 05.1-07.1 CS Premium www.stiebel-eltron.com
nectors also have a "twist and secure" function. Simply turning
the screw cap by hand will secure the pipe in the connector and
push the O-ring against the pipe to seal it.
Making the push-fit connection
The connector must be in its relaxed position before the pipe is
inserted. In this position, there is a small gap between the screw
cap and main body.
D0000088519
1
2
3
4
1 Retainer
2 Screw cap
3 Gap between screw cap and main body
4 Main body
D0000088520
Pipe Ø 28mm
Depth of insertion A max. 44mm
!Material losses
Pipe ends must be deburred.
f Always use a pipe cutter to trim pipes.
f Push the pipe past the O-ring into the push-fit connector
until it reaches the prescribed insertion depth.
f Tighten the screw cap by hand against main body as far as it
will go. This secures the push-fit connection.
Undoing the push-fit connection
If the push-fit connectors later need to be undone, proceed as
follows:
f Turn the screw cap anti-clockwise until there is a narrow gap
of approx. 2mm. Press the retainer back with your fingers
and hold on to it.
f Pull out the inserted pipe.
D0000088521
10.5 Oxygen diffusion
!
Material losses
Do not use open vented heating systems. Use oxygen
diffusion-proof pipes in underfloor heating systems with
plastic pipework.
In underfloor heating systems with plastic pipes that are per-
meable to oxygen and in open vented heating systems, oxygen
diffusion may lead to corrosion on the steel components of the
heating system (e.g. on the indirect coil of the DHW cylinder, on
buffer cylinders, steel radiators or steel pipes).
f With heating systems that are permeable to oxygen, separate
the heating system between the heating circuit and the buff-
er cylinder.
!
Material losses
The products of corrosion (e.g. rusty sludge) can set-
tle in the heating system components, which may re-
sult in a lower output or fault shutdowns due to reduced
cross-sections.
10.6 Filling the heating system
10.6.1 Heating water quality
The heating system is filled with drinking water. To prevent dam-
age to the heating system, comply with the following limits.
Unit Value
Water hardness °dH ≤3
pH value 6.5-8.5
Chlorine mg/l < 30
You can find out the water hardness and the chlorine value of the
fill water from the local water supplier.
f Observe local requirements (e.g. VDI2035 in Germany).
We do not recommend desalinating the fill water, as this may
cause a negative change in the pH value. If you desalinate the fill
water, check the pH value 8-12weeks after installation and after
each refill.
f Do not add inhibitors or additives to the filling water.
Accessories for water softening
If you need to soften the fill water, you can use the following
product.
- Heating water softener HZEA
- HZEN replacement cartridge
f Recheck these limits 8-12weeks after commissioning, every
time the system is topped up and during the annual service.

INSTALLATION
Installation
www.stiebel-eltron.com HPA-O 05.1-07.1 CS Premium | 17
Appliance in low-occupancy buildings
During regular operation, the connection lines and the system are
protected by the frost protection function of the appliance.
If the appliance is disconnected from the power supply for a longer
period of time (decommissioning, prolonged power failure), drain
the appliance on the water side. Otherwise the appliance is not
protected against frost.
If it is not possible to detect power failures (for example if the
system is in a holiday home left vacant for extended periods of
time), the following protective measure can be taken.
f Add a suitable concentration of ethylene glycol to the fill
water. Observe the instructions for the antifreeze. Only use
antifreeze products which have been approved by us.
f Please note that antifreeze changes the density and viscosity
of the fill water.
Part number
MEG 10 Heat transfer medium as concentrate on
an ethylene glycol base
231109
MEG 30 Heat transfer medium as concentrate on
an ethylene glycol base
161696
10.6.2 Safety concept
!
WARNING Injury
A safety valve is built into the appliance. Only a safety
valve with the same opening pressure can guarantee the
correct functioning of the safety concept.
f Do not replace the safety valve with another valve
that has a different opening pressure.
f Always use original spare parts.
1
D0000090348
1 Safety valve
A safety valve is built into the appliance. If the opening pressure is
exceeded, the safety valve will open. The escaping medium passes
into the condensate pan via a built-in hose.
Opening pressure [bar] Tolerance [bar]
2.5 +0.15 -0.35
Note
Only safety valves with an opening pressure of 3 bar may
be installed in the heating system.
10.6.3 Filling the heating system
f Fill the heating system via the drain (see chapter "Specifica-
tion/ Dimensions and connections").
f After filling the heating system, check the connections for
leaks.
10.6.4 Venting the heating system
Air vent valve on the inverter
D000035306
1
1 Ventilation
f Vent the pipework by activating the ventilation.
Automatic air vent valve
The air vent valve is factory-fitted in the open position. The heating
system is ventilated automatically.
D0000090348
1
1 Air vent valve

INSTALLATION
Electrical connection
18|HPA-O 05.1-07.1 CS Premium www.stiebel-eltron.com
10.7 Condensate drain
A condensate drain connector is factory-fitted to the defrost pan
to enable any condensate to drain off.
D0000107758
1
1 Condensate drain
f Observe chapter "Electrical connection/ Ribbon heater".
f If the appliance is sited on foundations, the condensate drips
freely into the condensate drain pipe.
f If the appliance is mounted on a bracket or T-support, attach
a condensate hose to the condensate drain.
f Protect the condensate hose against frost with sufficient
thermal insulation.
!
Material losses
Ensure the condensate hose is not kinked. Route the hose
with a slope.
f After routing the condensate hose, check that the condensate
can drain correctly.
10.8 External second heat generator
For dual mode systems, always connect the heat pump into the
return of the second heat generator (e.g. oil boiler).
10.9 High limit safety cut-out for area heating
system
!
Material losses
In order to prevent excessively high flow temperatures
in the area heating system causing damage in the event
of a fault, install a high limit safety cut-out to limit the
system temperature.
11. Electrical connection
Note
The leakage current of this appliance can be >3.5mA.
Since the unit is connected to the distribution board, the
leakage current from the unit and the residual currents
of the installation are recorded together during a residual
current test.
f Evaluate the percentage of leakage current from the
unit and the residual currents in the test result.
f Take into account the local and unit-specific condi-
tions at the test location, as well as any insulation
faults or other influencing factors.
Note
f Please observe the instructions for the heat pump
manager.
The connection must only be made by a qualified contractor and
in accordance with these instructions.
You must have permission to connect the appliance from the rel-
evant power supply utility.
11.1 Terminal area
WARNING Electrocution
f Before working on the appliance, isolate it from the
power supply at the control panel.
Note
The terminals are located in the terminal area of the ap-
pliance.
f Follow the instructions in the chapter "Preparation/ Prepar-
ing the electrical installation".
f For all connections, use appropriate cables in accordance
with local regulations.
Access to the terminal area
D0000035356

INSTALLATION
Electrical connection
www.stiebel-eltron.com HPA-O 05.1-07.1 CS Premium | 19
D0000035358
f Push the cover upwards.
D0000090349
1
2
1 Terminal area
2 Strain relief
f Route cables and leads through the strain relief fittings.
If space behind the appliance is limited, the terminal area can be
folded out.
D0000090351
f Undo the screw on the terminal area.
D0000035382
f Pivot the terminal area to the side.
D0000075146
f Fix the terminal area in place with the locking mechanism.

INSTALLATION
Electrical connection
20|HPA-O 05.1-07.1 CS Premium www.stiebel-eltron.com
XD02 connection: Electric emergency/booster heater (NHZ)
f Connect the electric emergency/booster heater:.
If the heating water temperature falls below 15°C while defrost-
ing, the emergency/booster heater is switched on. If on special
systems you can ensure that no defrosting will occur, you need
not connect the emergency/booster heater.
Additional functions of the emergency/booster heater:
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic op-
eration
If the dual mode point is undershot, the electric emer-
gency/booster heater safeguards both the heating oper-
ation and the provision of high DHW temperatures.
Emergency mode If the heat pump shuts down due to a fault, the heating
output is covered by the electric emergency/booster
heater.
Heat-up program
(only for underfloor
heating systems)
Where return temperatures are <25°C, the electric
emergency/booster heater must provide the necessary
heat for screed drying.
With such low system temperatures, the heat for screed
drying must not be provided by the heat pump, other-
wise the frost protection of the appliance can no longer
be guaranteed during the defrost cycle.
When the heat-up program has ended, the electric
emergency/booster heater can be disconnected if it is
not required for appliance operation.
Please note that during the heat-up program, emergency
mode is not available.
Pasteurisation
mode
The electric emergency/booster heater starts automat-
ically when pasteurisation mode is active. The DHW is
then regularly heated to 60°C to protect it against the
growth of legionella bacteria.
Terminal assignment
f Strip 10-11mm of insulation from the strands of the cables
for the electric emergency/auxiliary heater.
f Connect the cables according to the following diagram.
D0000090350
1
1 Earth terminal for screening the ELV lead
XD05 Safety extra low voltage (bus)
BUS High H
BUS Low L
BUS earth
BUS "+" (is not connected)
XD06 Connection for ribbon heater (Begl-Hz)
Output: L, N, PE
XD03 Control voltage (Strg)
ON
L
N
PE
XD02 Electric emergency/booster heater (DHC)
L, N, L, N, PE
Connected load Terminal assignment
3.0 kW L N PE
3.2kW L N PE
6.2kW L N L N PE
XD01 Compressor (WP)
L, N, PE
f Earth the ELV lead by inverting the screen over the cable
sheath and clamping it under the earth terminal.
f Then check that the strain relief fittings are working as in-
tended.
Closing the terminal area
D0000035356
1
2
1 Serrated washer
2 Screw
f Secure the cover with the screw and serrated washer.
f Connect the following components to the heat pump manag-
er in accordance with the technical guides:
- Circulation pump for the heat consumer side
- Outside temperature sensor
- Return sensor (only for operation with buffer cylinder)