STIEBEL ELTRON HPA-O 4 CS Plus User manual

OPERATION AND INSTALLATION
Air | water heat pump
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CONTENTS
SPECIAL INFORMATION
OPERATION
1. General information �����������������������������������������3
1.1 Other relevant documents ������������������������������������� 3
1.2 Safety instructions����������������������������������������������� 3
1.3 Other symbols in this documentation ����������������������� 4
1.4 Units of measurement ������������������������������������������ 4
1.5 Standardised output data �������������������������������������� 4
2. Safety����������������������������������������������������������4
2.1 Intended use������������������������������������������������������ 4
2.2 Safety instructions����������������������������������������������� 4
3. Appliance description ���������������������������������������5
3.1 Minimum software versions����������������������������������� 5
3.2 Operational characteristics ������������������������������������ 5
3.3 Function ����������������������������������������������������������� 5
4. Settings �������������������������������������������������������6
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 Standard delivery������������������������������������������������ 7
8.2 Accessories�������������������������������������������������������� 7
9. Preparations ��������������������������������������������������7
9.1 Sound emissions������������������������������������������������� 7
9.2 Minimum clearances�������������������������������������������� 8
9.3 Preparation of the installation location ��������������������� 8
9.4 Installing the supply lines������������������������������������� 10
9.5 WPM heat pump manager ������������������������������������ 10
9.6 Buffer cylinder �������������������������������������������������� 10
9.7 Preparing the electrical installation ������������������������ 11
10. Installation�������������������������������������������������� 11
10.1 Transport ��������������������������������������������������������� 11
10.2 Siting �������������������������������������������������������������� 11
10.3 Flow and return connection ���������������������������������� 12
10.4 Fitting the push-fit connectors������������������������������� 12
10.5 Heating water connection������������������������������������� 13
10.6 Oxygen diffusion������������������������������������������������ 13
10.7 Filling the heating system ������������������������������������ 13
10.8 Minimum flow rate ��������������������������������������������� 13
10.9 Setting the flow rate on the heating side������������������ 14
10.10 External second heat source ��������������������������������� 14
10.11 High limit safety cut-out for area heating system�������� 14
11. Electrical connection��������������������������������������� 15
11.1 Terminal area���������������������������������������������������� 15
12. Commissioning ��������������������������������������������� 16
12.1 Checks before commissioning�������������������������������� 16
12.2 Operation with an external second heat source���������� 16
12.3 Initial start-up��������������������������������������������������� 16
13. Settings ����������������������������������������������������� 17
13.1 Silent mode ������������������������������������������������������ 17
14. Shutdown ��������������������������������������������������� 18
14.1 Standby mode ��������������������������������������������������� 18
14.2 Power interruption ��������������������������������������������� 18
15. Maintenance ������������������������������������������������ 18
16. Troubleshooting �������������������������������������������� 18
16.1 Checking the IWS DIP switch settings ���������������������� 18
16.2 LEDs (IWS)�������������������������������������������������������� 20
16.3 Reset button ����������������������������������������������������� 20
16.4 Fan noise ��������������������������������������������������������� 20
17. Specification ������������������������������������������������ 21
17.1 Dimensions and connections ��������������������������������� 21
17.2 Wiring diagram ������������������������������������������������� 22
17.3 Application limit ������������������������������������������������ 24
17.4 Output diagrams HPA-O 3 CS Plus��������������������������� 25
17.5 Output diagrams HPA-O 4 CS Plus��������������������������� 26
17.6 Output diagrams HPA-O 6 CS Plus��������������������������� 27
17.7 Output diagrams HPA-O 8 CS Plus��������������������������� 29
17.8 Data table �������������������������������������������������������� 30
GUARANTEE
ENVIRONMENT AND RECYCLING

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SPECIAL INFORMATION | OPERATION
General information
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 resulting risks. Children must never play with
the appliance. Children must never clean the ap-
pliance or perform user maintenance unless they
are supervised.
- The connection to the power supply must be in
the form of a permanent connection. Ensure the
appliance can be separated from the power sup-
ply by an isolator that disconnects all poles with
at least 3mm contact separation.
- Maintain the minimum clearances to ensure trou-
ble-free operation of the appliance and facilitate
maintenance work.
- Maintenance work, such as checking the electri-
cal safety, must only be carried out by a qualified
contractor.
- We recommend regular inspection (to establish
the current condition of the system), and main-
tenance by a qualified contractor if required (to
return the system to its original condition).
- Following disconnection from the power supply,
parts of the appliance may remain energised
for 2 minutes until the inverter capacitors have
discharged.
- Never interrupt the heat pump power supply,
even outside the heating season. Otherwise, sys-
tem frost protection is not guaranteed.
- If the heat pump and frost protection are
completely switched off, drain the system on the
water side.
OPERATION
1. General information
The chapters "Special Information" and "Operation" are intended
for both the user 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 these instructions on to a new user if required.
1.1 Other relevant documents
Instructions for the WPM heat pump manager
Operating and installation instructions for connected
indoor unit
Operating and installation instructions for mounting
bracket used
Operating and installation instructions for system
components
Commissioning checklist for heat pump
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.
 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.
 Read these texts carefully.
Symbol Meaning
Material losses
(appliance damage, consequential losses and environmen-
tal pollution)
Appliance disposal
 This symbol indicates that you have to do something. The ac-
tion you need to take is described step by step.
1.4 Units of measurement
Note
All measurements are given in mm unless stated oth-
erwise.
1.5 Standardised output data
Explanations to determine and interpret the specified standardised
output data.
1.5.1 EN 14511
The output data specifically mentioned in text, 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 meet the
conditions found at the installation site of the system user.
Depending on the chosen test method and the extent to which
this method deviates from the test conditions defined in the first
paragraph of this section, any deviations can have a considerable
impact.
Further 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.
A confirmation of the specified output data can only be obtained
if the test conducted for this purpose is also performed in ac-
cordance with the test conditions defined in the first paragraph
of this section.
2. Safety
2.1 Intended use
The appliance is designed for room heating and cooling within
the application limits given in the specification.
This 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 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 currently applicable regulations during installation and
commissioning.
- Operate the appliance only when fully installed and with all
safety equipment fitted.
- Protect the appliance from dust and dirt ingress 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. Children must never clean the ap-
pliance or perform user maintenance unless they are
supervised.
!
WARNING Injury
 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 required for oper-
ating the heat pump:
HPA-O3CSPlus| HPA-O4CSPlus| HPA-O8CSPlus
- WPM: 390.09
- MFG: V.14
- FES: 417.05
HPA-O6CSPlus
- WPM: 390.12
- MFG: V.14
- FES: 417.07
3.2 Operational characteristics
The appliance is an air | water heat pump that operates as a heat-
ing heat pump for outdoor installation. Heat is extracted from the
outdoor air at a low temperature level, and is then transferred to
the heating water at a higher temperature. The heating water can
be heated up to a flow temperature of 60°C.
This appliance has further operational characteristics:
- Suitable for underfloor heating systems.
- Preferred for low temperature heating systems.
- Extracts heat from the outdoor air even at outside tempera-
tures of -20°C.
- Corrosion-protected, external casing made from hot-dipped
galvanised sheet steel plus stove-enamelled finish.
- Filled with non-combustible safety refrigerant.
Note
The appliance may only be used in conjunction with the
following products:
- Hydraulic module HM(S) (Trend) (BE)
- Cylinder and hydraulic module HSBB200(S)(BE)
- Integral cylinder HSBC 200 (S) (BE)
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. Any hoarfrost is
automatically defrosted. The resulting water flows out of the ap-
pliance via the free condensate drain and seeps away into the
gravel bed.
!
Material losses
In 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 operation without
a buffer cylinder, observe chapter “Menu/ Menu descrip-
tion/ SETTINGS/ HEATING/ STANDARD SETTING/ BUFF-
ER OPERATION” in the WPM installation instructions. This
prevents damage to the heat pump as a result of unfa-
vourable conditions.
Note
In winter, icicles can form on the bottom of the conden-
sate drain. This does not interfere with the operation
of the appliance, provided the condensate can drain off
unimpeded.
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 source may flow through the heat pump. Please note
that the return temperature must be no higher than 60°C.
3.3.2 Cooling
!
Material losses
The heat pump is not suitable for continuous, year-round
cooling.
 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.
 Take suitable measures to prevent the formation of
condensate.
Note
The HM(S) (Trend) (BE) is equipped for both area and
fan cooling.
The HSBB 200 (S) (BE) and HSBC 200 (S) (BE) can provide
area cooling.
Rooms are cooled by reversing the heat pump circuit. Heat is
extracted from the heating water. The evaporator transfers this
heat to the outdoor air.
Area cooling requires the installation of the FET remote control
unit in a reference room to capture the relative humidity and the
room temperature as part of dew point monitoring.
Fan cooling requires the installation of the FE7/ FET remote con-
trol unit in a reference room to capture the room temperature. In
addition, a buffer cylinder needs to be installed.
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).

OPERATION
Settings
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4. Settings
The system is operated exclusively with the WPM heat pump man-
ager. The heat pump manager is installed in the products required
as accessories (see chapter “Installation/ Appliance description/
Accessories”).
 Please observe the instructions for the heat pump manager.
5. Maintenance and care
!
Material losses
Maintenance work, such as checking the electrical safety,
may only be carried out by a qualified contractor.
A damp cloth is sufficient for cleaning all plastic and sheet metal
parts. Never use abrasive or corrosive cleaning agents.
 Protect the appliance from dust and dirt ingress during
building work.
!
Material losses
Keep the air discharge and intake apertures free from
snow and leaves.
We recommend regular inspection (to establish the current con-
dition of the system), and maintenance by a qualified contractor
if required (to return the system to its original condition).
6. Troubleshooting
Fault Cause Remedy
There is no hot
water or the
heating system
stays cold.
No power at the appli-
ance.
Check the fuses/MCBs in your
fuse box/distribution panel. Re-
place the fuses/reset the MCBs
if required. Notify your qualified
contractor if the fuses/MCBs
blow/trip again.
Condensate
collects on the
outside of the
appliance and on
the air grille.
The heat pump is extract-
ing heat from the outdoor
air to heat the building.
This can cause the hu-
midity 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 tempera-
tures above the freezing
point, the time between
two defrost cycles is in-
creased, thereby improv-
ing 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 contractor
(see chapter “Installation/ Trou-
bleshooting/ Fan noises”).
If you cannot remedy the fault, notify 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*
26�03�01�1736
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.
HPA-O 3 CS Plus| HPA-O 4 CS Plus
The tested appliance conforms to IEC 61000-3-3.
HPA-O 6 CS Plus | HPA-O 8 CS Plus
The tested appliance conforms to IEC 61000-3-12.
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. When the temperature in the buffer cylinder falls to below
+5°C, the heat pump is automatically started subject to the out-
side temperature.
8.1 Standard delivery
The following are delivered with the appliance:
- Wiring diagram
8.2 Accessories
8.2.1 Required accessories
- T-support SK 2 or wall mounting support WK 1
With integral emergency/booster heater
- Hydraulic module HM(S) (Trend), cylinder and hydraulic
module HSBB 200 (S) or integral cylinder HSBC 200 (S)
Without integral emergency/booster heater
- Hydraulic module HMSTrendBE, cylinder and hydraulic
module HSBB200SBE or integral cylinder HSBC200SBE
8.2.2 Further accessories
- Remote control for heating systems FET
- Remote control for heating systems FE7
- High limit safety cut-out for area heating system STB-FB
- Cover CH1
9. Preparations
!
D0000060163
The appliance is designed for installation on a T-support or wall
mounting support. Observe the minimum clearances. If the appli-
ance is installed in an open space, protect the air intake side. Do
this by erecting a wall to shield it against the wind. A gravel bed
is an essential requirement for both installation versions.
9.1 Sound emissions
The appliance is louder on the air intake and air discharge sides
than on the two enclosed sides. Observe the following information
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.
- Sound propagation can also be reduced by installing closely
spaced palisade fencing around the appliance.
 Ensure that the air intake direction is the same as the domi-
nant wind direction. Air should not be blown out against the
wind.
 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.
 Avoid installation between reflective building walls. Reflect-
ing building walls can increase the noise level.

INSTALLATION
Preparations
8|HPA-O CS Plus www.stiebel-eltron.com
9.2 Minimum clearances
≥2000
≥500
≥200 ≥300
≥1000
≥800
D000005758191�00�00�0036
 Never install the appliance in a recess. Two sides of the ap-
pliance must remain exposed.
 Maintain the minimum clearances to ensure trouble-free op-
eration of the appliance and facilitate maintenance work.
9.3 Preparation of the installation location
 Observe chapter "Sound emissions".
 Ensure that the appliance is accessible from all sides.
9.3.1 Condensate drain
!
WARNING Injury
At temperatures below freezing point, ice may form.
 Do not allow the gravel bed or surrounding area to
slope downwards towards paths.
!
Material losses
The foundations of the building must have a damp proof
membrane.
Note
 Never use grit for the gravel bed.
Example: Gravel bed under T-support SK 2
>800 100
300
a
D0000063484
1
1 Drainage pipe
Heat pump a
HPA-O 3 CS Plus 700
HPA-O 4 CS Plus 700
HPA-O 6 CS Plus 830
HPA-O 8 CS Plus 830
 Lay a drainage pipe under the appliance to drain moisture
away from the building.
 Create a gravel bed below the condensate drain of the
appliance.

INSTALLATION
Preparations
www.stiebel-eltron.com HPA-O CS Plus | 9
Example: Gravel bed under wall mounting support WK 1
>800
≥300
a
b
D0000065666
1
1 Drainage pipe
Heat pump a b
HPA-O 3 CS Plus 900 865
HPA-O 4 CS Plus 900 865
HPA-O 6 CS Plus 1000 995
HPA-O 8 CS Plus 1000 995
 Lay a drainage pipe under the appliance to drain moisture
away from the building.
 Create a gravel bed below the condensate drain of the
appliance.
9.3.2 Siting
Example: T-support SK 2
B
C
A
1
3
2150150
D0000063486
1 Air intake side
2 Air discharge side
3 Main wind direction
Heat pump A B C
HPA-O3CSPlus 850 500 408
HPA-O4CSPlus 850 500 408
HPA-O6CSPlus 980 500 408
HPA-O8CSPlus 980 500 408
!
Material losses
The T-support may bend if the heat pump is subject to
any lateral load.
 Do not exert any pressure on the sides of the heat
pump.
 Observe the static limits of the T-support used.
To cover the supply lines, you can install a cover hood.
Note
You can install the cover hood either vertically or hori-
zontally.
 Observe the installation instructions for the cover
hood.
200
200 190-400
D0000084661

INSTALLATION
Preparations
10|HPA-O CS Plus www.stiebel-eltron.com
200
300-400
200
D0000084662
Example: Wall mounting support WK 1
Note
To prevent disturbance due to structure-borne noise
transmission, never install the wall mounting support
on the external walls of living areas or bedrooms.
 Install the wall mounting support on a garage wall,
for example.
Note
Condensate drips from the appliance onto the floor.
 Observe the minimum clearance below the appli-
ance (see chapter "Preparations/ Minimum clear-
ances").
≥200
2
31
D0000057582
1 Heating flow
2 Heating return
3 Wall mounting support
 Observe the static limits of the wall mounting support used.
To cover the supply lines, you can install a cover hood.
 Observe the installation instructions for the cover hood.
200
200 190-400
D0000084663
9.4 Installing the supply lines
The supply lines are all electric cables plus the heating flow and
return lines.
- To facilitate connection to the appliance, we recommend
using flexible supply pipes/cables in the case of outdoor
installation.
 Use only weatherproof cables, e.g. NYY.
 Protect the flow and return lines against frost with sufficient
thermal insulation. Provide thermal insulation in accordance
with applicable regulations.
 Also protect all supply lines/cables against humidity, damage
and UV radiation by means of a conduit.
 Protect all pipe fixings and external wall ducts with anti-vi-
bration insulation.
9.5 WPM heat pump manager
A WPM heat pump manager is required to operate the appliance.
This controls the entire heating system. The heat pump manager
is installed in the products defined as required accessories (see
chapter "Installation/ Appliance description/ Accessories").
9.6 Buffer cylinder
!
Material losses
A buffer cylinder with diffusion-proof insulation is es-
sential to enable cooling by means of fan convectors. An
emergency/booster heater must be connected.
Note
When providing cooling via an underfloor heating system
no buffer cylinder is required.
A buffer cylinder is recommended 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.
 When operating without a buffer cylinder, observe the de-
tails specified in chapter "Minimum flow rate with individual
room control by means of FET/ FE7 in systems without buffer
cylinder".
Note
For operation without a buffer cylinder, we recommend
installing an electric emergency/booster heater (DHC).
An emergency/booster heater is installed in some of the
products required as accessories (see chapter “Installa-
tion/ Appliance description/ Accessories”).
 If you do not install an emergency/booster heater,
for fault-free operation activate the WW LEARNING
FUNCTION parameter in the WPM heat pump man-
ager.

INSTALLATION
Installation
www.stiebel-eltron.com HPA-O CS Plus|11
9.7 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 voltage.
 Observe the type plate.
!
Material losses
 Provide separate fuses for the two power circuits
(for the appliance and the control unit).
Note
The appliance includes an inverter for the variable speed
compressor. In case of a fault, inverters can cause DC
residual currents. If RCDs are provided, they have to be
type B AC/DC-sensitive.
A DC residual current can block type A RCDs.
 Make sure that the appliance power supply is dis-
connected from the fuse board/distribution panel.
The electrical data is provided in chapter “Specification”. You re-
quire a J-Y (St) 2x2x0.8mm² cable as a BUS cable.
 Lay the relevant pipe cross-sections. Observe the applicable
national and regional regulations.
HPA-O 3 CS Plus | HPA-O 4 CS Plus
Fuse protec-
tion
Assignment Cable cross-section
1x B 16 A Compressor
(single phase)
2.5 mm² for routing through a wall
1.5 mm² when routing on a wall or in an
electrical conduit on a wall
1x B 16 A Control unit 1.5 mm²
HPA-O 6 CS Plus | HPA-O 8 CS Plus
Fuse protec-
tion
Assignment Cable cross-section
1x B 25 A Compressor
(single phase)
4.0 mm² for routing through a wall
2.5 mm² when routing on a wall or in an
electrical conduit on a wall
Alternative:
1x B 16 A Compressor
(single phase)
4.0 mm² for routing through a wall
2.5 mm² when routing on a wall or in an
electrical conduit on a wall
1x B 16 A Control 1.5 mm²
 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.
The cable cross-section must be designed for the maximum pos-
sible operating current of the appliance (see “Specification/Data
table”).
10. Installation
10.1 Transport
!
Material losses
Protect the appliance against heavy impact during
transport.
You can transport the appliance in various ways:
 When carrying, hold on to the narrow sides (transverse
sides) under the base plate.
 Slide a robust pipe through the holes at the bottom of the
appliance frame to create a handle.
D0000071298
If the appliance needs to be tilted during transport only do so
for a short time on one of its longitudinal sides. The longer the
appliance is tilted, the greater the distribution of refrigerant oil
in the system.
 Wait approx. 30minutes before starting the appliance after it
has been tilted.
10.2 Siting
 When siting the appliance, observe the air discharge direc-
tion (see chapter "Preparations/ Sound emissions").
 Mount the appliance on the T-support or wall mounting sup-
port. Observe the installation instructions for the mounting
bracket used.

INSTALLATION
Installation
12|HPA-O CS Plus www.stiebel-eltron.com
10.3 Flow and return connection
!
Material losses
For cooling with fan convectors, the heating flow and
heating return lines must be provided with vapour dif-
fusion-proof insulation.
 Take the position of the heating flow and return from the fol-
lowing diagram:
D0000058375
1
2
1 Heating flow
2 Heating return
 Connect the heat pump to the heating circuit. Check for
tightness.
Cooling with a buffer cylinder
 Install an immersion/contact sensor in the heating flow,
downstream of the buffer cylinder.
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.
 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.
 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: 27.5±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-
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.
26�03�01�0693
3
1
24
1 Retainer
2 Screw cap
3 Gap between screw cap and main body
4 Main body
26�03�01�0693
Pipe Ø 22 mm
Depth of insertion A 33.3 mm
!Material losses
Pipe ends must be deburred.
 Always use a pipe cutter to trim pipes.
 Push the pipe through the O-ring into the push-fit connector
until it reaches the prescribed insertion depth.
 Tighten the screw cap by hand against main body as far as it
will go. This locks the push-fit connection.
Undoing the push-fit connection
If the push-fit connectors later need to be undone, proceed as
follows:
 Turn the screw cap anti-clockwise until a there is a narrow
gap of approx. 2mm. Press the retainer back with your fin-
gers and hold on to it.
 Pull out the inserted pipe.
26�03�01�0693

INSTALLATION
Installation
www.stiebel-eltron.com HPA-O CS Plus|13
10.5 Heating water connection
The heat pump heating system must be connected by a qualified
contractor in accordance with the water installation diagrams,
which are part of the technical guides.
 Before connecting the heat pump, flush the pipework thor-
oughly with suitable water. Foreign bodies (e.g. welding
pearls, rust, sand, sealant, etc.) can impair the operational
reliability of the heat pump.
 Connect the heat pump on the heating water side. Check for
tightness.
 Ensure that the heating flow and return are connected
correctly.
 Provide thermal insulation in accordance with applicable
regulations.
 When sizing the heating circuit, observe the internal pressure
differential (see chapter “Specification / Data table”).
10.6 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).
 In the event of oxygenation, separate the heating system be-
tween the heating circuit and the buffer cylinder.
!
Material losses
The products of corrosion (e.g.rusty sludge) can settle
in the heating system components and result in a lower
output or fault shutdowns due to reduced cross-sections.
10.7 Filling the heating system
10.7.1 Water quality
Carry out a fill water analysis before the system is filled. This
analysis may, for example, be requested from the relevant water
supply utility.
To avoid damage as a result of scaling, it may be necessary to
soften or desalinate the fill water. The fill water limits specified
in chapter "Specification/ Data table" must always be observed.
 Recheck these limits 8-12 weeks after commissioning, after
every refill and as part of the annual system service.
Note
 Never add inhibitors or other additives to the fill
water.
Note
The appliance offers frost protection for the connection
lines in regular operation.
In the event of prolonged power failure or when shutting
down, drain the DHW side of the appliance.
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.
 Add a suitable concentration of ethylene glycol to
the fill water.
 Please note that antifreeze changes the density and
viscosity of the fill water.
Note
With a conductivity >1000μS/cm, desalination treatment
is recommended in order to prevent corrosion.
Note
Suitable appliances for water softening, as well as for
filling and flushing heating systems, can be obtained via
trade suppliers.
10.7.2 Filling the heating system
 Fill the heating system on the heating side.
10.7.3 Venting the heating system
The appliance has an automatic air vent valve.
D0000063489
1
1 Automatic air vent valve
 Remove the hood and the EPS cover (see chapter "Trouble-
shooting/ Checking the IWS DIP switch settings").
 Vent the pipework by turning the grey cap on the automatic
air vent valve.
 Close the automatic air vent valve after the venting process.
 Reattach the EPS cover and hood on the appliance.
10.8 Minimum flow rate
The minimum flow rate and the defrost energy must always be
assured (see chapter “Specification/ Data table”).

INSTALLATION
Installation
14|HPA-O CS Plus www.stiebel-eltron.com
10.9 Setting the flow rate on the heating side
!
Note
We recommend installing an electric emergency/booster
heater.
An emergency/booster heater is installed in some of the
products required as accessories (see chapter “Installa-
tion/ Appliance description/ Accessories”).
The flow rate is set automatically via the self-regulating system
(see menu “COMMISSIONING/ HEATING/ SPREAD CONTROL/
STANDBY PUMP RATE” in the heat pump manager).
In heat pump mode a fixed spread between the heat pump flow
and return is set (see menu “COMMISSIONING/ HEATING/ SPREAD
CONTROL” in the heat pump manager).
The appliance is designed in such a way that no buffer cylinder
is required in conjunction with appropriately sized area heating
systems.
Installations with several heating circuits require a buffer cylinder
to be used.
Checking the flow rate
 Set parameter STANDBY PUMP RATE to 100%.
 Set buffer operation to OFF.
 If no buffer cylinder is installed, close all controllable heating
circuits.
 The current flow rate can be called up in the menu “INFO/
HEAT PUMP/ PROCESS DATA” under “WP WATER FLOW
RATE”.
 Compare the value with the specification (see chapter “Speci-
fication/ Data table”).
 If the specified flow rate is not met, take suitable measures
to achieve the flow rate.
 If no buffer cylinder is installed, reopen all controllable heat-
ing circuits.
 Reset the parameters to their original values.
10.9.1 Minimum flow rate with individual room control by
means of FET/ FE7 in systems without buffer cylinder
In the case of systems without buffer cylinder, in the menu “SET-
TINGS/ HEATING/ STANDARD SETTING”, set parameter “BUFFER
OPERATION” to “OFF”.
In such cases, one or more heating circuits in the heating system
must be left open. Ensure the minimum flow rate (see “Speci-
fication/ Data table”) by means of the correspondingly opened
heating circuits (see table “Design recommendation for underfloor
heating system in the lead room”).
Note
The table applies if individual room control is installed.
Sizing recommendation for the underfloor heating system in the
lead room:
Minimum flow
rate
Minimum water content of the
buffer cylinder or the open cir-
cuits
Composite pipework 16 x 2mm
/ clearance 10cm
Composite pipework 20 x 2.25mm
/ clearance 15cm
Lead room
floor area
Number of cir-
cuits
Lead room
floor area
Number of cir-
cuits
l/h lm² nxm m² nxm
HPA-O 3 CS Plus 400 16 21 3x70 21 2x70
HPA-O 4 CS Plus 400 16 21 3x70 21 2x70
HPA-O 6 CS Plus 600 19 21 3x70 21 2x70
HPA-O 8 CS Plus 600 19 21 3x70 21 2x70
Buffer cylinder always
required
Recommended buffer cylinder
volume, underfloor heating
system
Recommended buffer cylinder
volume, radiators
Activate the integral
emergency/booster
heater
HPA-O 3 CS Plus No 100 100 yes
HPA-O 4 CS Plus No 100 100 yes
HPA-O 6 CS Plus No 100 100 yes
HPA-O 8 CS Plus No 100 100 yes
 Install the open heating circuit(s) in the lead room (room
where the external programming unit of the heat pump con-
trol unit is installed, such as in the living room). The individ-
ual room can then be controlled either with the external pro-
gramming unit or indirectly by adjusting the heating curve or
the room influence.
10.9.2 Minimum flow rate for systems with a buffer cylinder
When using a buffer cylinder, in the menu “SETTINGS/ HEAT-
ING/ STANDARD SETTING”, set parameter “BUFFER OPERATION”
to “ON”.
10.10 External second heat source
With dual mode systems, connect the heat pump into the return
of the second heat source.
10.11 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.

INSTALLATION
Electrical connection
www.stiebel-eltron.com HPA-O CS Plus|15
11. Electrical connection
WARNING Electrocution
Before working on the appliance, isolate it from the
power supply at the terminal area.
Note
Please observe the instructions for the heat pump man-
ager.
Connection work must only be carried out by a qualified contractor
and in accordance with these instructions.
Permission to connect the appliance may need to be obtained from
the local power supply utility.
11.1 Terminal area
The terminals are located in the terminal area of the appliance.
Observe chapter "Preparing the electrical installation".
 For all connections, use appropriate cables in accordance
with local regulations.
Access to the terminal area
D0000058263
 Unscrew and remove the two screws.
 Slide the cover down.
 Remove the cover by pivoting it open to the right.
D0000058264
1
2
1 Terminal area
2 Strain relief
 Route cables and leads through the strain relief fittings.
 Terminate the screen at both ends of the bus cable.
 If you wish to use the following appliance functions, install
an electric emergency/booster heater. An emergency/booster
heater is installed in some of the products required as ac-
cessories (see chapter “Installation/ Appliance description/
Accessories”).
Appliance func-
tion
Effect of the electric emergency/booster
heater
Mono energetic
operation
If the dual mode point is undershot, the electric emer-
gency/booster heater safeguards both the heating opera-
tion and the delivery of high DHW temperatures.
Emergency mode Should the heat pump suffer a fault that prevents its con-
tinued operation, the heating output will be covered by
the electric emergency/booster heater.
Heat-up program
(only for underfloor
heating systems)
Where return temperatures are <25°C, the electric emer-
gency/booster heater must provide the necessary heat for
screed drying.
With these low system temperatures, the drying heat
must not be provided by the heat pump, otherwise the
frost protection of the appliance can no longer be guar-
anteed during the defrost cycle.
Pasteurisation
control
To heat up the water regularly to a temperature of 60°C
to protect against the growth of legionella bacteria, the
electric emergency/booster heater is started automatical-
ly when pasteurisation control is enabled.
 Connect the cables according to the following diagram.
 Earth the LV lead by inverting the screen over the cable
sheath and clamping it under the earth terminal.
Note
 Earth the LV lead either at the outdoor unit or at one
of the products defined as required accessories (see
chapter "Installation/ Appliance description/ Acces-
sories").
 Then check the function of the strain relief fittings.

INSTALLATION
Commissioning
16|HPA-O CS Plus www.stiebel-eltron.com
!
Material losses
Strain relief fittings that are too tight may lead to a short
circuit.
 Never tighten them completely.
Connection
nc H L
N L1
X2X4X3
T
D0000058265
1
2
3
1X3 Compressor (inverter)
L1, N,
2X4 Control voltage
Power supply: L, N
3X2 Safety extra low voltage (BUS)
nc (not assigned)
High H
Low L
12. Commissioning
A WPM heat pump manager is required to operate the appliance.
All necessary adjustments prior to and during operation are made
on this device.
Only qualified contractors may make the settings in the heat pump
manager commissioning report, commission the appliance and
instruct the owner in its use.
Carry out commissioning in accordance with these operating and
installation instructions, and the instructions for the heat pump
manager. Our service department can assist with commissioning,
which is a chargeable service.
Where this appliance is intended for commercial use, the rules of
the relevant Operational Safety Ordinance must be observed at
commissioning. For further details, check with your local author-
ising body (e.g. TÜV).
12.1 Checks before commissioning
Before commissioning, check the following points (note the com-
missioning checklist):
12.1.1 Heating system
- Have you filled the heating system to the correct pressure
and closed the automatic air vent valve?
12.1.2 Temperature sensor
- Have you correctly positioned and connected the outside
temperature sensor and return temperature sensor (in con-
nection with a buffer cylinder)?
12.1.3 Power supply
- Have you correctly connected the power supply?
12.2 Operation with an external second heat source
The appliance is factory set for compressor operation with an elec-
tric emergency/booster heater. If the appliance is operated in dual
mode with an external second heat source, set the DIP switch to
"Compressor mode with external second heat source" (see chapter
"Troubleshooting/ Checking the IWS DIP switch settings").
12.3 Initial start-up
12.3.1 Heating curve adjustment
The efficiency of a heat pump decreases as the flow temperature
rises. Adjust the heating curve carefully. Heating curves that are
set too high result in the zone and thermostatic valves closing,
which may prevent the minimum flow rate required in the heating
circuit from being achieved.
 Please observe the instructions for the heat pump manager.

INSTALLATION
Settings
www.stiebel-eltron.com HPA-O CS Plus | 17
The following steps will help you to adjust the heating curve cor-
rectly:
- Fully open thermostatic or zone valves in a lead room (e.g.
living room and bathroom).
We do not recommend installing thermostatic or zone valves
in the lead room. Control the temperature for these rooms
via remote control.
- At different outside temperatures (e.g. –10°C and +10°C),
adjust the heating curve so that the required temperature is
set in the lead room.
Standard values to begin with:
Parameters Underfloor heating
system
Radiator heating
system
Heating curve 0.4 0.8
Controller dynamics 10 10
Comfort temperature 20°C 20°C
If the room temperature is not high enough in spring and autumn
(approx. 10°C outside temperature), go to the heat pump manager
menu under "SETTINGS / HEATING / HEATING CIRCUIT" and raise
the "COMFORT TEMPERATURE" parameter.
Note
If no remote control is installed, raising the "COMFORT
TEMPERATURE" parameter leads to a parallel offset of
the heating curve.
If the room temperature is not high enough when outside temper-
atures are low, increase the "HEATING CURVE RISE" parameter.
If you raise the "HEATING CURVE RISE" parameter, adjust the zone
valve or thermostatic valve in the lead room to the required tem-
perature when outside temperatures are high.
!
Material losses
Never reduce the temperature in the entire building by
closing all zone or thermostatic valves, but by using the
setback programs.
When everything has been implemented correctly, the system
can be heated to its maximum operating temperature and vented
once again.
!
Material losses
With underfloor heating systems, observe the maximum
permissible temperature for the system.
12.3.2 Other settings
 For operation with or without a buffer cylinder, observe the
information in the instructions for the WPM and param-
eter BUFFER OPERATION in menu SETTINGS/ STANDARD
SETTING.
If using the heat-up program
When using the heat-up program, observe the information in the
commissioning instructions for the heat pump manager (chapter
“PROGRAMS/ HEAT-UP PROGRAM”).
13. Settings
13.1 Silent mode
SILENT MODE is an operating mode for air/water heat pumps in
which the sound level of the heat pump is reduced.
 See the data table (see chapter “Specification/ Data table”)
for the sound power level when silent mode is deactivated.
You can reduce the fan speed and compressor output for a certain
time in the “COMMISSIONING/ SILENT MODE/ OUTPUTREDUC-
TION” menu.
Note
If you activate SILENT MODE, the maximum output at A-7/
W35 is reduced to 70% as standard.
This value can be increased further or reduced to the
specified minimum value as required.
Note
When silent mode is active, operating costs will be higher.
In silent mode 2, heating and DHW heating are provided
solely via the emergency/booster heater.
 See the table for the maximum appliance sound levels ac-
cording to the settings made in the “COMMISSIONING/ SI-
LENT MODE/ OUTPUTREDUCTION/ OUTPUT” menu.
Setting in the
WPM
Sound power
level
Heating
output
Output re-
stricted to
[%]
Maximum value
due to output
restriction
[dB(A)]
Maximum at
A-7/W35
[kW]
HPA-O 3 CS Plus 70 54 2.23
43 52 1.38
HPA-O 4 CS Plus 70 56 2.65
35 52 1.38
HPA-O6CSPlus 70 58 4,96
35 57 2,76
HPA-O 8 CS Plus 70 61 4.96
35 57 2.76
 In the “PROGRAMS/ SILENT PROGRAM1” menu, set the
times when the heat pump should switch to a quieter oper-
ating mode.

INSTALLATION
Shutdown
18|HPA-O CS Plus www.stiebel-eltron.com
14. Shutdown
!
Material losses
Never interrupt the heat pump power supply, even out-
side the heating season. Otherwise, system frost protec-
tion is not guaranteed.
The heat pump manager automatically switches the heat
pump to summer or winter mode.
14.1 Standby mode
To shut down the appliance, simply set the heat pump manager
to "Standby mode". This way the safety functions that protect the
system remain enabled, e.g. frost protection.
14.2 Power interruption
If the system is to be isolated from the power supply permanently,
please observe the following:
!
Material losses
 If the heat pump and frost protection are completely
switched off, drain the system on the water side.
15. Maintenance
WARNING Electrocution
 Prior to commencing any service or cleaning work,
isolate the appliance across all poles from the
power supply.
Following disconnection from the power supply, parts of
the appliance may remain energised for 2minutes until
the inverter capacitors have discharged.
!
Material losses
Keep the air discharge and intake apertures free from
snow and ice.
 Remove any leaves or other foreign bodies from the evapora-
tor fins periodically.
We recommend a regular inspection (to establish the current con-
dition of the system), and maintenance if required (to return the
system to its original condition).
16. Troubleshooting
WARNING Electrocution
Before working on the appliance, isolate it from the
power supply at the control panel.
Following disconnection from the power supply, parts of
the appliance may remain energised for 2 minutes until
the inverter capacitors have discharged.
Note
Please observe the instructions for the heat pump man-
ager.
If you cannot locate the fault using the heat pump manager, use
the controls on the IWS.
 Read the following sections on troubleshooting and carry out
the instructions.
16.1 Checking the IWS DIP switch settings
 Carry out the following steps to make the IWS accessible.
D0000063487
 Undo and remove the four screws on the sides of the hood.
 Remove the hood.
D0000063488
 Unscrew and remove the four screws on the top panel.
 Remove the top panel.

INSTALLATION
Troubleshooting
www.stiebel-eltron.com HPA-O CS Plus | 19
D0000063490
1
2
1
1
2
2
1 Screws to be unscrewed
2 Screws to be removed
 Unscrew and remove the screws.
D0000063530
 Completely remove the side panel by sliding it upwards.
 The IWS is located above the terminal area.
BA
D0000063997
1
2
3
4
1 Reset button
2 DIP switch (WP-Typ)
3 DIP switch (BA)
4 LEDs
16.1.1 DIP switch (WP-Typ)
With the DIP switch (WP-Typ), you can set the IWS to suit the
relevant heat pump type.
Factory setting
Compressor mode with electric emergency/booster heater
Note
An emergency/booster heater is installed in some of the
products required as accessories (see chapter “Installa-
tion/ Appliance description/ Accessories”).
WP - Typ
ON
1234
D0000057054
 Check whether the DIP switch is set correctly.
Compressor mode with external second heat source
!
Material losses
In this case, do not connect the electric emergency/boost-
er heater.
If the appliance is operated in dual mode with an external second
heat source, set the DIP switch as follows.
WP - Typ
ON
1234
D0000057055
16.1.2 DIP switch (BA)
Factory setting
BA
ON
1234
D0000051579

INSTALLATION
Troubleshooting
20|HPA-O CS Plus www.stiebel-eltron.com
16.2 LEDs (IWS)
BA
D0000063997
1
2
1 Reset button
2 LEDs
The following table shows the meaning of the LEDs on the IWS.
LED indicator Meaning
Red LED flashes Single fault. The appliance shuts down. The appli-
ance restarts after 10 minutes. The LED extinguish-
es.
Red LED illuminates Multiple faults occurred. The appliance shuts down.
The appliance only restarts following a reset on the
IWS. The internal fault counter will then be reset.
The appliance can be restarted after 10minutes.
The LED extinguishes.
Green LED (centre)
flashes
The heat pump is initialising.
Green LED (centre) illu-
minates
The heat pump was initialised successfully and the
connection with the WPM is active.
Faults indicated by the red LED:
- High pressure fault
- Low pressure fault
- Central fault
- Hardware fault on the IWS (see fault list)
16.3 Reset button
If the IWS was incorrectly initialised, you can reset the settings
with this button.
 For this, also observe chapter “Reinitialising the IWS” in the
heat pump manager instructions.
16.4 Fan noise
The heat pump extracts heat from the outdoor air. This causes
the outdoor air to cool down. At outside temperatures of 0°C to
8°C, the air may be cooled to below freezing point. If, under these
conditions, precipitation occurs in the form of rain or fog, ice may
form on the air grille, the fan blades or the air routing pipes. If the
fan comes into contact with this ice, noise develops.
How to remedy rhythmic scratching or grinding noises:
 Check whether condensate can drain freely from the
appliance.
 Check whether the design output and temperature are set
correctly. Ice formation is particularly pronounced when
a high heating output is called for at moderate outside
temperatures.
 Carry out a manual defrost, repeatedly if required, until the
fan runs free again. Observe the information in the heat
pump manager instructions and the “START DEFROST” pa-
rameter in the “COMMISSIONING/ COMPRESSOR” menu.
 At outside temperatures above + 1°C, switch the appliance
off for around 1hour or switch it over to emergency mode.
After this, the ice should have melted.
 Check whether the appliance is installed in line with the in-
stallation conditions.
 If noise occurs frequently, notify the service department.