Thermann X Hybrid 220 User guide

INSTALLER'S
MANUAL
Heat Pump Water Heaters
Installation Details
Warranty
Model
Thermann X Hybrid Heat Pump 220
Thermann X Hybrid Heat Pump 300

2
Thermann Installer's Manual
Heat Pump Water Heaters
SPECIAL INFORMATION
-The appliance may be used by children over 8years of age and persons with reduced
physical, sensory or mental capabilities or a lack of experience and expertise, pro-
vided that they are supervised or they have been instructed on how to use the ap-
pliance safely and have understood the potential risks. Children must never play with
the appliance. Children must never clean the appliance or perform user maintenance
unless they are supervised.
-Observe all applicable national and regional regulations and instructions.
-Observe the minimum clearances (see chapter "Installation/ Preparations/ Siting the
appliance").
-Observe the requirements concerning the installation room (see "Specification/ Data
table").
-The appliance is supplied with a flexible power cable without plug. In the case of a
permanent connection, the appliance must be able to be separated from the power
supply by an isolator that disconnects all poles with at least 3mm contact separa-
tion. Contactors, circuit breakers or fuses can be used for this. This type of isolator
must be installed in the fixed electrical installation according to the regulations. For
Australia: Ensure that the appliance can be separated from the power supply by a
suitable isolator. Contactors, circuit breakers, fuses or general purpose electrical wir-
ing plugs can be used for this. The type of isolator must be installed according to the
electrical installation regulations.
-Observe the safety measures to prevent contact with dangerous live currents.
-Observe the MCB/fuse protection required for the appliance (see chapter "Specifica-
tion/ Data table").
-If the power cable is faulty, replace it with a new one. The power cable must only be
replaced (for example if damaged) by a qualified contractor.
-The appliance is pressurised. During the heat-up process, expansion water will drip
from the safety valve.
-Activate the valves at least every 6 months to prevent them from becoming blocked,
e.g. by limescale deposits.
-Drain the appliance as described in "Installation/ Maintenance and cleaning/ Drain-
ing the cylinder".
-A T&P valve or a cold water expansion control valve, or both, must be installed. Ob-
serve all applicable national and regional regulations and instructions.
-The maximum pressure in the cold water supply line must be at least 20% below the
lowest response pressure of all installed safety valves. Otherwise a pressure reducing
valve is required. If this is the case, install a pressure reducing valve in the cold water
supply line. The pressure reducing valve must be set to 540kPa if a safety valve is in-
stalled; otherwise to 700kPa.
-Fit the drain pipe of the safety valve with a constant downward slope and in a room
free from the risk of frost.
-Size the drain pipe so that water can drain off unimpeded when the safety valve is
fully opened.
-The safety valve drainage aperture must remain open to atmosphere.

3
OPERATION
General information
The chapter "Installation" is intended for qualified contractors.
Note
Read these instructions carefully before using the appliance and retain them for future reference.
Pass on the instructions to a new user if required.
Safety instructions
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.
Symbols, type of risk
Symbol Type of risk
Injury
Electrocution
Burns
(burns, scalding)
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-serious or minor injury.
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 environmental pollution)
Appliance disposal
 This symbol indicates that you have to do something. The action you need to take is described step by
step.
Units of measurement
Note
All measurements are given in mm unless stated otherwise.
!
!

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Thermann Installer's Manual
Heat Pump Water Heaters
INSTALL ATION
Safety
Only a qualified contractor should carry out installation, commissioning, maintenance and repair of the ap-
pliance.
General safety instructions
We guarantee trouble-free function and operational reliability only if original accessories and spare parts
intended for the appliance are used.
Instructions, standards and regulations
Note
Observe all applicable national and regional regulations and instructions.
Take note of the appliance type plate and chapter "Specification".
Appliance description
The heat pump drive unit is located in the upper section of the appliance. The hot water cylinder is located
in the lower section of the appliance.
Standard delivery
The following are delivered with the appliance:
-Condensate drain bend
-2 straight G1 to G3/4 pipe adaptors
-T&P valve G1/2
-Reducer from R3/4 male thread to G1/2 female thread
Required accessories
Various safety assemblies are available to protect the appliance against impermissible excess pressure and
limit the output delivery temperature.
Additional accessories
-Condensate pump (if the condensate cannot be drained off with a naturally occurring fall)
Incorrect use
The following are not permitted:
-Operating the appliance when the casing is open
-Filling the appliance with a refrigerant other than the one detailed in chapter "Specification/ Data table"
-Heating liquids other than potable water
Observe the list of requirements regarding the installation room and non-permissible installation sites (see
chapter "Installation site").
Preparation
Transport
!
CAUTION Injury
 Observe the weight of the appliance.
 Use suitable transport aids (e.g. sack truck, hand trolley) and enough personnel for transportation.

5
!
Material losses
The appliance has a high centre of gravity and low overturning moment.
 Safeguard the appliance against falling over.
 Only set the appliance down on an even base.
!
Material losses
The appliance casing is not designed to withstand strong forces. Incorrect handling can lead to material
losses of considerable extent.
 Observe the information on the packaging.
Only remove the packaging shortly before the installation.
Where possible, do not unpack the appliance until it has arrived in the installation room.
For transport and handling leave the appliance in its packaging and on the pallet. This enables brief horizontal
transport and provides places to hold on to during transport.
If the appliance has to be unpacked before transportation, we recommend using a hand trolley. Pad the con-
tact surfaces to avoid damaging the appliance. Secure the appliance using a strap. Pad between the strap and
the appliance and avoid overtightening the strap. Where stair wells are narrow, you can carry the appliance
by the handles on the sack truck or trolley and the foot of the appliance.
Vehicular transport
!
Material losses
The appliance must generally be stored and transported vertically.
On tarmac, asphalt, bitumen or otherwise paved roads you may transport the appliance horizontally over a
maximum distance of 160km. Strong shocks are not permissible.
!
Material losses
If transported horizontally, the appliance must always be laid on the shaded side of the box.
The appliance must not remain in a horizontal position for more than 24hours.
If the appliance was transported horizontally, leave it to rest in a vertical position for at least one hour
before commissioning.
 Observe the information on the packaging.
D0000034797
1
1
1 Recessed grips
Transport from vehicle to installation room
The cardboard box has reinforced handholds (recessed grips). You can use these recessed grips, as well as
the pallet at the lower end, to carry the appliance into the installation room. Take note of the weight of the
appliance and ensure a sufficient number of personnel is available for handling the appliance.

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Thermann Installer's Manual
Heat Pump Water Heaters
Storage
If it is necessary to store the appliance for a prolonged period before installation, observe the following in-
formation:
-Only store the appliance in a vertical position. Never store the appliance horizontally.
-Store the appliance in a location that is dry and largely dust-free.
-Protect the appliance from coming into contact with corrosive substances.
-Ensure the appliance is not subjected to shocks or vibrations.
Installation location
!
Material losses
Observe the following list of requirements regarding the installation site.
-Install the appliance where it will be as little exposed to strong direct wind, extreme rain, sun or snow
as possible, but will still be well ventilated. Unhindered air intake and air discharge should be possible. If
necessary, protect the appliance against the elements with a canopy, base and deflectors.
-The installation site must be free from flammable, highly combustible gases and substances, as well as
high levels of dust.
-The application limits for the heat pump and hot water cylinder must be maintained (see chapter "Speci-
fication/ Data table").
-The substrate of the installation site must be level and have sufficient load bearing capacity. Take note
of the weight of the appliance with a full hot water cylinder (see chapter "Specification/ Data table").
A floor with insufficient load bearing capacity is in danger of collapse. If the appliance is not level, there
may be a risk of appliance damage.
-In the case of indoor installation, the size of the installation room must correspond to the application lim-
its of the appliance (see chapter "Specification/ Data table").
-Observe the safety clearances and protection zones.
-Always leave sufficient space to provide access for installation, maintenance and cleaning. Observe the
minimum clearances (see "Preparations/ Siting the appliance").
-Ensure the operation of other equipment in the installation room is not impaired.
-To keep the water pipe lengths as short as possible, we recommend installing the appliance close to the
kitchen or bathrooms.
-To prevent adverse effects from operating noise, never install the appliance close to bedrooms.
!
Material losses
Never install or draw off supply air from locations with aggressive atmospheres. This may damage the
appliance.
 Check the wider environment around the planned installation location. Check for anything which
may have an adverse effect on the installation location or the appliance air supply.
Examples of unacceptable locations
Atmospheres containing ammonia Sewage works, pigsties
Substances which block the evaporator Air containing oil or grease; dust (cement, flour, etc.)
Note: If the air contains hairspray (e.g. in hairdressing salons), the appliance should be
operated with shorter maintenance intervals.
Saline environments Coastal installations (<200m from the coast) can reduce component service life.
Atmospheres containing chlorine or chloride Swimming pools, salt works
Atmospheres containing thermal water
Areas in proximity to high frequency ma-
chines
Inverters for large motors, radar, etc.
Note
The output data given for this appliance has been determined in accordance with the relevant standard
at an intake temperature of 15°C. Below 15°C, the efficiency of the appliance decreases.
Note
You can improve the efficiency of the appliance by utilising the waste heat from other appliances to
heat the hot water cylinder, e.g. boilers, tumble dryers or freezers.

7
Sound emissions
The sound emissions are louder on the air intake and air discharge sides of the appliance than on the closed
sides.
 Never direct the air intake or air discharge towards noise-sensitive rooms of the house, e.g. bedrooms.
Note
For details on sounds emissions, see chapter "Specification/ Data table".
Siting the appliance
 Carefully undo the cardboard packaging at the clips.
D0000034797
1
1 Cardboard packaging clips
The appliance is secured to the pallet with metal brackets and screws. The metal brackets are hooked on to
the feet underneath the floor plate of the appliance.
1. 2.
D0000034798
1
1 Metal bracket fixing screw
 Remove the fixing screws of the metal brackets from the pallet.
 Push the metal brackets a little towards the cylinder centre to unhook them from the appliance feet.
 Pull the metal brackets out from underneath the appliance.
!
Material losses
Take note of the appliance's weight and centre of gravity.
 Slightly tip the appliance and carefully roll the appliance off the pallet.
 Position the appliance in the final installation site.

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Thermann Installer's Manual
Heat Pump Water Heaters
!
Material losses
The appliance must be positioned vertically to avoid damage.
The feet under the floor plate of the appliance are height-adjustable.
 Level the appliance horizontally using the height-adjustable feet.
D0000039043
Minimum clearances
 Maintain the minimum clearances.
≥150
≥350
≥400
≥400
≥500
D0000029620
Installation
!
WARNING Injury
Incorrect installation can lead to serious injury or material losses.
Before any work, ensure sufficient clearances for the installation.
Handle sharp-edged components carefully.
Water connection
!
Material losses
Carry out all water connection and installation work in accordance with regulations.
!
Material losses
The corrosion protection provided by the anode can only be guaranteed when the electrical conduc-
tivity of the domestic hot water is within the limits stated in the chapter "Specification/ Data table".

9
The following material combinations are approved for metal pipework installations:
Cold water inlet hot water outlet
Copper pipe Copper pipe
Steel pipe Steel pipe or copper pipe
 Thoroughly flush the pipework before connecting the appliance. Foreign bodies, such as abraded plastic
or metal, rust, sand or sealant can impair the operational reliability of the appliance.
!
Material losses
To protect the connections against corrosion the water connection must be made with flat gaskets.
The use of hemp on connections is not permissible.
 Install the hot water outlet line and the cold water inlet line (see chapter "Specification/ Dimensions and
connections").
Hot water circulation
A hot water circulation is not allowed.
Safety equipment
A T&P valve or a cold water expansion control valve must be installed. Observe the applicable local and re-
gional regulations.
T&P valve (850kPa)
D0000063547
1 2
1 T&P valve
2 Reducer from R3/4 male thread to Rp1/2 female thread
 If specified, install a type-tested T&P valve with reducer, using the corresponding connection on the
appliance.
The response pressure of the valve must be below or equal to the permissible operating pressure of the hot
water cylinder. The valve protects the appliance against impermissible pressure or temperature rises. The
diameter of the cold water supply line must be no greater than the diameter of the valve.
 Ensure that the expansion water escaping from the valve can drip into a drain, e.g. a funnel, tundish.
Ensure the drain cannot be shut off.
 Size the drain pipe so that water can drain off unimpeded when the safety valve is fully opened.
 Ensure that the drain hose of the safety valve is open to atmosphere.
 Fit the safety valve drain pipe with a constant downward slope and in a location free from the risk of
frost.
Cold water expansion control valve (700kPa)
 If specified, install a type-tested 700kPa expansion control valve in the cold water supply line.
The safety valve protects the appliance against impermissible excess pressure. The diameter of the cold water
supply line must be no greater than the diameter of the safety valve.
 Ensure that the expansion water escaping from the safety valve can drip into a drain, e.g. a tank or
funnel.
Ensure the drain cannot be shut off.
 Size the drain pipe so that water can drain off unimpeded when the safety valve is fully opened.
 Ensure that the safety valve drain pipe is open to atmosphere.
 Fit the drain pipe of the safety valve with a constant downward slope and in a room free from the risk of
frost.

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Thermann Installer's Manual
Heat Pump Water Heaters
Pressure reducing valve
The maximum pressure in the cold water supply line must be at least 20% below the lowest response pres-
sure of all installed safety valves. Otherwise a pressure reducing valve is required. If this is the case, install a
pressure reducing valve in the cold water supply line. The pressure reducing valve must be set to 540kPa if
a safety valve is installed; otherwise to 700kPa.
Drain valve
 Install a suitable drain valve at the lowest point in the cold water supply line.
Thermal insulation
 Insulate the hot water line and valves against heat loss and to improve energy efficiency in accordance
with locally applicable regulations.
 Insulate the cold water supply line to prevent condensate forming.
Hot water outlet
WARNING Burns
The water in the hot water cylinder can be heated to temperatures in excess of 60°C. There is a risk
of scalding at outlet temperatures in excess of 43°C.
In Australia and New Zealand, observe regulations in accordance with AS/NZS3500.4:
 Install a temperature limiter in all systems intended for personal hygiene, e.g. tempering valve,
thermostatic mixing valve.
Condensate drain
Install a condensate drain hose to drain off the condensate that is created.
 Connect the condensate drain bend included in the standard delivery to the condensate drain
connection.
 Connect a condensate drain hose to the condensate drain bend.
!
Material losses
Ensure condensate cannot back up.
 Use a condensate drain hose with a diameter greater than the diameter of the condensate drain
bend.
 Ensure the condensate drain hose is not kinked.
 Route the condensate drain hose with a continuous fall.
The condensate drain must be open to atmosphere.
 Use a suitable condensate pump if there is insufficient fall. Take the building characteristics into account.
Condensate pan heater
!
Material losses
If the temperature at the installation site could continuously (1-2 days) fall below freezing, install a
condensate pan heater. The condensate pan heater is not part of the standard delivery.
When the compressor is running, install a load-dependent relay to switch on the condensate pan heater after
a delay. The condensate pan heater must have an external power supply.
Electrical connection
WARNING Electrocution
The appliance is supplied with a flexible power cable without plug. In the case of a permanent connec-
tion, the appliance must be able to be separated from the power supply by an isolator that disconnects
all poles with at least 3mm contact separation. Contactors, circuit breakers or fuses can be used for
this. This type of isolator must be installed in the fixed electrical installation according to the regulations.
For Australia: Ensure that the appliance can be separated from the power supply by a suitable isolator.
Contactors, circuit breakers, fuses or general purpose electrical wiring plugs can be used for this.
The type of isolator must be installed according to the electrical installation regulations.
WARNING Electrocution
Carry out all electrical connection and installation work in accordance with national and regional reg-
ulations.

11
WARNING Electrocution
Ensure that the appliance is earthed.
WARNING Electrocution
Observe the safety measures to prevent contact with dangerous live currents.
WARNING Electrocution
Coming into contact with live components presents a threat to life. Disconnect the appliance from
the power supply before carrying out work inside the appliance. Prevent the power supply from being
switched on while you are working on the system.
WARNING Electrocution
Insufficient earthing can lead to electrocution. Ensure the appliance is earthed according to locally
applicable requirements.
WARNING Electrocution
If the power cable is faulty, replace it with a new one. The power cable must only be replaced (for ex-
ample if damaged) by a qualified contractor.
!
Material losses
The specified voltage must match the mains voltage. Observe the type plate.
!
Material losses
Observe the MCB/fuse protection required for the appliance (see chapter "Specification/ Data table").
!
Material losses
Never connect the appliance to the power supply before the hot water cylinder is filled.
The appliance is supplied with a flexible connecting cable without plug.
 If the connecting cable is not long enough, you may detach from the appliance and replace with a longer
suitable cable, or extend connection as permitted by regional and national regulations (eg. use of a junc-
tion box).
 When routing the new connecting cable, ensure that it is waterproof as it passes through the existing
cable grommet. Connect the cable properly inside the appliance.
Standard connection (without external signal transmitter)
X0
2
L
L
N
N
PE
PE
1
1
2
X3
2
3
3
1
1
2
L
N
PE GNYE
BU
BN
D0000050560
BN Brown
BU Blue
GNYE Green/yellow
Separate power supply to the impressed current anode
At the factory, the appliance is fitted with rechargeable batteries that ensure the power supply to the impressed
current anode in the case of a power failure. If regular interruptions to the power supply are not anticipated,
the rechargeable batteries will require no maintenance.
Every three years, a qualified contractor must replace the batteries for the impressed current anode in the
following cases:
-The impressed current anode is not separately connected to a continuous power supply and a switching
contact regularly interrupts the power supply to the appliance.
-The security of supply is inadequate.

12
Thermann Installer's Manual
Heat Pump Water Heaters
Failure to observe this point puts the appliance at risk of damage.
The need to replace the batteries can be avoided by connecting the impressed current anode separately to a
continuous power supply. This continues to protect the hot water cylinder against corrosion if the rest of the
appliance is switched off, e.g. by a controlled power supply.
 Remove the appliance cover (see chapter "Cleaning and maintenance/ Removing the appliance cover").
D0000056083
12
1 Strain relief
2 Terminal X0
 Prepare the cables in such a way that each cable terminates with a wire ferrule.
 Push the cables through one of the cable entries in the appliance casing.
 Route leads through the strain relief.
 Remove the jumper which leads from X0/N to X0/2 in the delivered condition.
 Remove the jumper which leads from X0/L to X0/1 in the delivered condition.
X0
2
L
L
N
N
PE
PE
L
N
PE GNYE
BU
BN
1
1
2
X3
2
3
3
1
1
2
L1 / L2 / L3
N
A
B
D0000059152
A Power supply provided by power supply utility or energy management system for switching the
load (compressor)
B Power supply to impressed current anode and PCB
BN Brown
BU Blue
GNYE Green/yellow
 Connect the cables for the separate impressed current anode power supply to X0/1 and X0/2.
!
Material losses
The power supply to the impressed current anode must be continuously ensured.
Connection with external signal transmitter
Note
This type of connection must only be carried out by a qualified electrician.
Note
The appliance has a second, higher set temperature which is preset at the factory. This is activated in
the event of an external switching signal. Set temperature2 takes priority over the standard set tem-
perature while there is an external switching signal.
An external signal transmitter for switching a separate set hot water temperature (set temperature2) can be
connected to terminal X3/1-2. In the delivered condition, terminal X3/1-2 is not assigned. If this terminal is
connected at the voltage stated in the specification (see "Permissible voltage range, external signal transmit-
ter") (L to X3/1, N to X3/2), the appliance activates set temperature2.
Following a one-off activation (signal is present for at least 1minute), set temperature2 applies for at least
20minutes. Set temperature2 is ranked higher than set temperature1. When the relevant set hot water tem-
perature has been reached, the compressor switches off and remains off for a minimum idle time of 20minutes.

13
The following diagram illustrates the connections by means of a sample signal sequence from an external
signal transmitter.
Example :
Water temperature °C62
Set temperature1°C61
Set temperature2°C65
A
1
00510 15 20 25 30 35 40 45 50 55 60 65 70 75 t [min]
B11
0 2
0510 15 20 25 30 35 40 45 50 55 60 65 70 75 t [min]
D0000034613
A External signal
B Compressor
1 20 min. minimum runtime, set temperature2
2 20 min. minimum compressor idle time
 Remove the appliance cover (see chapter "Cleaning and maintenance/ Removing the appliance cover").
D0000056083
12
1 Strain relief
2 Terminal X3
 Prepare the cables in such a way that each cable terminates with a wire ferrule.
 Push the cables through one of the cable entries in the appliance casing.
 Route leads through the strain relief.
 Connect the cables to X3.
Example 1 : Power supply utility signal with its own phase
X0
2
L
L
N
N
PE
PE
L
N
PE GNYE
BU
BN
1
1
2
X3
2
3
3
1
1
2
L1 / L2 / L3
N
EVU
D0000059154
EVU Power supply utility
BN Brown
BU Blue
GNYE Green/yellow

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Thermann Installer's Manual
Heat Pump Water Heaters
Example 2 : Photovoltaic signal via on-site relay and phase routed out of the appliance
Note
The relay in the inverter must meet the following requirements:
-Potential-free relay (240VAC/ 24VDC, 1A) with N/O contact
-Adherence to safety regulations and standards for safety extra low voltage
-The switching output must be programmed so that the relay contact closes or opens if certain lim-
its (inverter output level) are exceeded or undershot.
If necessary, check with the inverter manufacturer whether the product meets the stated criteria.
X0
2
L
L
N
N
PE
PE
L
N
PE GNYE
BU
BN
1
1
2
1
X3
2
3
3
1
1
2
D0000059155
1 Inverter (floating contact)
BN Brown
BU Blue
GNYE Green/yellow
The inverter power feed is usually located at a central distribution point (e.g. in the main distribution board).
Assembling the appliance
Note
Refit the appliance cover after completing your work. See chapter "Maintenance and cleaning/ Fitting
the appliance cover".
Commissioning
Initial start-up
Note
Fill the hot water cylinder before switching on the power supply to the appliance.
The appliance is equipped with boil-dry protection to prevent operation if the hot water cylinder is not
completely full of water.
Note
Following an interruption of the power supply, compressor operation remains blocked for at least one
minute while the appliance initialises.
If the compressor subsequently fails to start, it may be blocked by additional safety devices (motor
overload relay, high pressure switch). This block can last between 1 and 10minutes.
Filling the hot water cylinder
Fill the hot water cylinder and vent the pipework by following the procedure below:
 Close the drain valve.
 Open all hot water draw-off points and the shut-off valve in the cold water supply.
 Close the hot water draw-off points as soon as water starts to emerge from them.
 Check the safety valve by leaving it open until water runs out.

15
Settings / function check
In the delivered condition, the appliance is set to a hot water temperature of >61°C.
 Switch the mains power ON.
Note
Following an interruption of the power supply, compressor operation remains blocked for at least one
minute while the appliance initialises.
If the compressor subsequently fails to start, it may be blocked by additional safety devices (motor
overload relay, high pressure switch). This block can last between 1 and 10minutes.
 Check the appliance function.
 Check the function of the safety assembly.
Appliance handover
 Explain the appliance function to users and familiarise them with its operation.
Example: The appliance is in "element boost" mode. The element boost heater switches off temporarily when
the temperature in the upper section of the cylinder reaches 67°C during heat-up. The heat pump has not yet
heated the lower section to 65°C and the "element boost heating" function has therefore not yet finished.
The "element boost heater" symbol is displayed until element boost heating has finished.
 Make users aware of potential dangers, especially the risk of scalding.
 Make users aware of critical environmental factors and requirements concerning the installation site.
 Inform users that water may drip from the safety valve during the heat-up process.
 Please note that the appliance is not protected against frost and corrosion when it is disconnected
from the power supply. At the factory, the appliance is fitted with rechargeable batteries that ensure
the power supply to the impressed current anode in the case of a power failure. The batteries must be
replaced by a qualified contractor every three years, if the power supply is regularly interrupted by a
switching contact or the security of supply is inadequate. We recommend a maintenance contract for re-
placing the batteries.
 Hand over these operating and installation instructions to users for safekeeping.
Recommissioning
Note
Following an interruption of the power supply, compressor operation remains blocked for at least one
minute while the appliance initialises.
If the compressor subsequently fails to start, it may be blocked by additional safety devices (motor
overload relay, high pressure switch). This block can last between 1 and 10minutes.
If the appliance is switched off due to an interruption to the power supply, no specific measures for restarting
are required once the power supply has been restored.
Appliance shutdown
!
Material losses
If you disconnect the appliance from the power supply, it is no longer protected against frost or cor-
rosion.
 Only disconnect the appliance from the power supply for longer periods if you are also draining
the hot water cylinder. See chapter "Maintenance/ Draining the appliance".
The appliance can only be switched off by interrupting the power supply.
 Disconnect the appliance from the power supply at the MCB/fuse in the domestic distribution board or
by unplugging from a general purpose outlet.

16
Thermann Installer's Manual
Heat Pump Water Heaters
Troubleshooting
WARNING Electrocution
Troubleshooting must only be carried out by a qualified contractor. Prior to all work on the appliance,
isolate it from the power supply.
!
Material losses
If you disconnect the appliance from the power supply, it is no longer protected against frost or cor-
rosion.
 Only disconnect the appliance from the power supply for longer periods if you are also draining
the hot water cylinder.
 For work inside the appliance, remove the appliance cover (see chapter "Cleaning and maintenance/ Re-
moving the appliance cover").
 If necessary, remove the upper section of the casing jacket (see chapter "Maintenance and cleaning/ Re-
moving the casing ring").
Note
Refit the casing ring after completing the work. See chapter "Maintenance and cleaning/ Fitting the
casing ring").
Note
Following an interruption of the power supply, compressor operation remains blocked for at least one
minute while the appliance initialises.
If the compressor subsequently fails to start, it may be blocked by additional safety devices (motor
overload relay, high pressure switch). This block can last between 1 and 10minutes.
 See chapter "Troubleshooting" in the Owner's Guide.
Fault display in the programming unit
The "service/fault" symbol on the appliance programming unit indicates the occurrence of a fault when it
illuminates or flashes. If the symbol is still illuminated or flashing after 12hours, please contact the service
department.
A permanently illuminated "service/fault" symbol indicates that a fault has occurred, but the heat pump is
still heating. A flashing "service/fault" symbol indicates that a fault has occurred and the heat pump is no
longer heating.
"Service/
fault"
symbol
Possible causes of fault Note Remedy
illumi-
nated
The integral sensor is faulty. If the integral sensor is faulty, it is set to
the value of the cylinder top sensor, and
amount of mixed water is calculated
using this value. The appliance contin-
ues to deliver heat.
Contact the service department.
The cylinder top sensor is faulty. The appliance continues to deliver heat. Contact the service department.
Hot gas temperature sensor faulty The appliance limits the set tempera-
ture to 50°C.
Contact the service department.
Impressed current anode short
circuit or faulty protective anode
If the impressed current anode is faulty,
the appliance is not protected against
corrosion.
Contact the service department.
No communication between con-
troller and programming unit.
The controller carries on running inde-
pendently.
Contact the service department.
After 70 minutes of defrosting,
the evaporator temperature has
not yet reached 3°C. The com-
pressor is not working.
If the fault is continuously displayed, an
air intake temperature outside the ap-
plication limits may be the cause.
The fault is cleared automatically once the
evaporator temperature rises to 3°C.
flashes The cylinder top sensor and the
integral sensor are faulty. The ap-
pliance no longer delivers heat.
The appliance does not permit emer-
gency heating mode.
Contact the service department.
Air intake temperature sensor
faulty
Contact the service department. Activate
emergency heating mode.
Evaporator temperature sensor
faulty
Contact the service department. Activate
emergency heating mode.
The anode current is interrupted.
The appliance does not heat up.
The appliance does not permit emer-
gency heating mode.
Check the impressed current anode and the
wiring.

17
"Service/
fault"
symbol
Possible causes of fault Note Remedy
The appliance is locked out due to
being switched off frequently for
safety reasons (high pressure).
The safety pressure limiter has re-
sponded 5 times in 5hours.
Contact the service department. The appli-
ance can only be unlocked with a service pro-
gramming unit. Activate emergency heating
mode.
The appliance has ascertained
that the hot water cylinder has
not been heated for 13hours, de-
spite there being a demand.
The compressor is permanently locked
out.
Check whether there is excessively high, con-
tinuous hot water draw-off or if a hot water
circulation line is installed. Check whether
there is a fault in the refrigerant circuit. Con-
tact the service department. Activate emer-
gency heating mode. In the case of this fault,
the result of carrying out a reset by interrupt-
ing the power supply is that emergency heat-
ing mode can only be activated again after
13hours.
Evaporator temperature <-20°C;
air flow rate too low
The compressor is permanently locked
out.
Check whether the fan is faulty. Check whether
the evaporator is contaminated. Check wheth-
er the air intake or air discharge is blocked.
The compressor can only be unlocked by
means of a reset carried out by interrupting
the power supply. Check whether there is an
air flow rate after carrying out the reset by in-
terrupting the power supply.
As a qualified contractor you can bypass the compressor lockout time and reset several faults. Switch the
power supply OFF and back ON again via the fuse/MCB in the domestic distribution board.
If the "service/fault" symbol is flashing, you can continue to use the appliance temporarily by activating emer-
gency heating mode. Press and hold the "Rapid heat-up" button for two seconds. See chapter "Operation/
'Rapid heat-up' button/ Emergency heating mode".
There are some cases in which emergency heating mode cannot be activated. For example, if the hot water
cylinder is empty or temperature sensors are faulty, the appliance locks out the electric emergency/booster
heater.
Resetting the safety pressure limiter
The safety pressure limiter responds if the pressure in the refrigerant circuit exceeds the permissible maximum
value. If the safety pressure limiter responds 5 times in 5hours, compressor operation is blocked.
 Eliminate the cause of the increased pressure in the refrigerant circuit.
 Wait approx.5-15minutes for the appliance to equalise the pressure.
The appliance can only be unlocked with a service programming unit.
Resetting the high limit safety cut-out
If the hot water cylinder is overheated, the high limit safety cut-out switches off the electric emergency/
booster heater to protect the appliance.
D0000039352
1
1 Reset button for high limit safety cut-out
 Once the cause of the fault has been removed, press the reset button of the high limit safety cut-out on
the rod thermostat. To do so, remove the appliance cover.

18
Thermann Installer's Manual
Heat Pump Water Heaters
Motor overload relay
The motor overload relay will shut down the compressor in the event of excessive thermal load.
 Remove the cause.
After a short cooling period, the motor overload relay will restart the compressor automatically.
Maintenance
WARNING Electrocution
Prior to all work on the appliance, isolate it from the power supply.
Removing the appliance cover
D0000040621
 Undo the screw (Torx) that attaches the cover to the appliance.
 Push the cover upwards.
D0000040622
 Carefully remove the cover.
 Undo the plug-in connection in the electrical cable that runs to the battery pack on the back of the
fascia.
 Carefully lift away the appliance cover and undo the earth cable that runs from the appliance control
panel to the cover.
Note
Refit the appliance cover after completing your work. See chapter "Maintenance and cleaning/ Fitting
the appliance cover".
Removing the casing ring
Note
If you require more space to work inside the appliance, you can remove the casing ring on the upper
section of the appliance.

19
D0000034803
1
1 Fixing screws on casing ring
The casing ring is fastened with screws.
 Undo the fixing screws on the casing ring.
 Remove the condensate drain bend and pipe collar of the drain. Turn anti-clockwise to undo them.
!
Material losses
Inside the appliance, an earth cable is connected to the casing ring. Undo the earth cable in order to
be able to remove the casing ring.
D0000034814
The casing ring overlaps along the joint. A tab on one end clips into the recess at the other end of the casing
ring.
 Ease the casing ring apart, until it can be removed or slid downwards.
Note
Refit the casing ring after completing the work. See chapter "Maintenance and cleaning/ Fitting the
casing ring").
Cleaning the evaporator
!
WARNING Injury
The evaporator consists of numerous sharp-edged fins.
 Be careful when cleaning the evaporator and wear protective clothing, especially safety gloves.
In order to maintain the appliance performance as best as possible, check and clean the appliance evaporator
as often as necessary.
 Undo the screw that fastens the appliance cover to the top of the fascia.
 Remove the fascia and the appliance cover.
 Carefully clean the evaporator fins. Only use water and a soft brush for this. Never use acidic or alkaline
cleaning agents.

20
Thermann Installer's Manual
Heat Pump Water Heaters
Draining the cylinder
WARNING Burns
Hot water may escape when you drain the appliance.
To drain the hot water cylinder, e.g. when shutting the appliance down, proceed as follows.
 Isolate the appliance from the power supply.
 Close the shut-off valve in the cold water inlet line.
The hot water cylinder is drained via the cold water supply line.
 Open the drain valve installed in the cold water supply line (see chapter "Water connection"). If no drain
valve has been installed, undo the cold water supply line at the "Cold water inlet" connection.
 To vent the system, undo the hot water line connected to the "hot water outlet" connection.
Some residual water will remain in the bottom of the hot water cylinder.
Descaling the electric emergency/booster heater
Only descale the flange of the emergency/booster heater after disassembly. Never treat the inside of the hot
water cylinder or the impressed current anode with descaling agents. The electric emergency/booster heater
is screwed into the hot water cylinder of the appliance at a central point at the top.
D0000039351
1
1 Electric emergency/booster heater with protective anode
Valves
Regularly check the valves in the system (safety valve, pressure reducing valve, drain valve) to ensure the
operational reliability of the appliance. The amount of limescale deposits depends on the local water quality.
 Check all valves in the system and remove limescale deposits.
 Replace the valves if necessary.
 Check the function of the valves.
Condensate drain
 Check whether the condensate drain is clear of obstructions. Remove contaminants.
Replacing the power cable
WARNING Electrocution
The power cable must only be replaced (for example if damaged) by a qualified contractor.