Kronoterm WP2 LF-202S Operation manual

Instructions for Use and Installation
Of the Heat Pump for Heating DHW
WP2 LF-202S
WP2 LF-302S
The manual has to be handed over to the end user after installation.
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ENG

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Manual for use and installation - Version 06 / Status 6.2017
Printed in Slovenia, copyright: Kronoterm d.o.o.
This document is copyrighted. Any use outside the provisions of the copyright law without the
permission of Kronoterm d.o.o. is illegal and punishable by law. All previous versions of this
document are void. We reserve the right to make changes and mistakes in print.

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1 Index
1Index 2
2Important information 4
2.1 Symbols 4
2.2 General warnings and instructions 4
2.3 Safety warnings and instructions 5
2.4 Obligations of the manufacturer 8
2.5 Obligations of the installer during installation 8
2.6 Customer support and service 8
2.7 Obligations of the user 8
2.8 Factory testing 9
2.9 Storage 9
2.10 Transport 9
2.11 Delivery package 10
3Technical description 10
3.1 General 10
3.2 Components 11
3.3 Operating principle 13
4The position of connections and dimensions 14
5Installation of the device 15
5.1 Minimal clearance from the device 16
5.2 Levelling of the device 17
5.3 Hydraulic connection 17
5.4 Installation of air ducts. 19
5.5 Connection for water condensate 21
5.6 Connecting the pipe heat conductor 22
5.7 Installation of the temperature sensor for the external controller 25
5.8 Electrical connection 26
5.8.1 The electrical connection of the additional heat source and external switch 26
6Commissioning of the device 27
6.1 Filling the device with water 27
6.2 Inspections before commissioning 27
6.3 Connecting the device to the electrical supply 28
6.4 Commissioning of the device 28
7Controller 29
7.1 Controls 29
7.2 The program and parameters 30
7.3 Settings for programmes and parameters 31
7.3.1 Setting the water temperature 31
7.3.2 Switching between various operation programmes 31
7.3.3 Display and settings of parameters 31
7.3.4 Programme “Antifreeze” P.0 31
7.3.5 Programme “Normal” P.1 31
7.3.6 Programme “Res. Source” P.3 31
7.3.7 Programme “Automatic” P.5 32
7.3.8 Programme “Photovoltaic-PV” P.6 32
7.3.9 Programme “External signal” P.7 32
7.3.10 Parallel operation of the device’s generator and electric heater (only automatic
programmes P.5, P.6 and P.7): 32
7.3.11 Programme “Overheating-antilegionella” 33
7.3.12 Programme “Quick heating” of water 33
8Warnings and errors 34
8.1 Warnings 34

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8.2 Errors 34
9Disposal 35
10 Care and maintenance 35
11 Disturbances in the operation 35
12 Electrical wiring diagram 35
13 Technical data 37
14 Legend of data label 38

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2 Important information
The manual describes the process of installation and maintenance of the device. The
installation and maintenance can only be performed by qualified personnel. Read the manual
carefully before the installation, this way you will be informed about the intended use,
functionality and process of handling the device.
The manual has to be handed over to the end user after installation.
In case the product shall be given to a third person for use, the manual has to be
handed over to them as well.
Definitions:
An informed person is a person who reads this manual.
A qualified person has a certificate of expert qualifications.
The authorised technician is trained and authorised by the manufacturer to perform
maintenance and servicing of the device.
The user uses the device according to its use.
The installer is a person professionally trained for performing hardware and/or electro-
installation work and mounting of the device.
Incorrect use of the device can lead to damage of the device, property or injury to the user.
For limiting risks, the important information in this manual is highlighted with symbols.
2.1 Symbols
Various levels of danger can occur while performing installation, maintenance and use.
Warnings in the manual will guide you to properly and safely handle the device by avoiding
eventual dangers and ensure correct operation of the device.
These symbols mark various risks for the user or the device.
DANGER: Risk of situations which can lead to serious physical injuries.
WARNING: Risk of situations which can lead to minor physical injuries.
CAUTION: Risk of situations which can lead to damage or malfunction of the
device.
This symbol marks information for the user.
NOTE: A notice which holds important information regarding the device,
requirements and the manufacturer.
2.2 General warnings and instructions
NOTE
Read the instructions for use and installation before installation.
NOTE
Any remaking or replacement of original components of the device eliminates
the manufacturer’s guarantee for safe and functional operation. In the case of
undesignated and incorrect use of the device, the manufacturer is not
responsible for the consequences and will not acknowledge claims for
damages in these cases. The user is solely responsible for injuries and
damages on the device itself or on other objects resulting from undesignated
and incorrect use of the device.

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NOTE
The installation of the device has to be performed in accordance with the
manual; otherwise the manufacturer does not acknowledge the warranty.
NOTE
It is necessary to consider all technical data and instructions in this manual
as well as all warnings and notes during planning, design, installation and use
of the device.
DANGER
Failure to comply with the manual and good practise while connecting the
device to the power supply can lead to serious injury or death.
WARNING
This device is intended for home use. Use of the device in hotels, stores,
farms, light industry and other public buildings is permitted to experts or
specially trained staff.
WARNING
Connecting the device to the power source can only be performed by a
qualified installer.
2.3 Safety warnings and instructions
WARNING
The device cannot be installed on a location where air is polluted with toxic
agents which could damage the device (stables, warehouses with dangerous
substances, outdoors, etc.)
WARNING
The inlet pipe of the device has to be fitted with a safety valve with a nominal
pressure of 0.6 MPa (6 bar) which prevents pressure raising in the water
heater above the nominal pressure.
WARNING
Transportation of the device is allowed in upright position. In case the device
is laid on the side, it is necessary to consider the instructions on the package
or in this manual.
WARNING
The buffer tank for DHW is intended for storing drinking water, this is why the
water has to be in accordance with the national regulations on drinking water
in force; otherwise, damage to the device and a termination of the warranty
can arise.
WARNING
If there is no water in the buffer tank for DHW, the device must not be in
operation.

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WARNING
The connecting cable has a standard plug suitable for a standard socket (16
A; 230 V ac). This socket has to have its own power supply directly from the
main electrical cabinet. Other devices must not be connected to the same
line.
WARNING
The water from the device is emptied through the inlet pipe of the DHW buffer
tank. For this reason, it is advisable to install a special link or discharge valve
between the safety valve and the inlet pipe.
WARNING
For ensuring proper functioning of the safety valve, the valve has to be
checked regularly. Clean the lime scale if necessary and make sure the safety
valve is not blocked.
WARNING
Water can drip from the drainage pipe of the overflow, the pipe must be
subjected to outdoor air . If you fit the valve with a pipe, it must be facing
downward so the water inside cannot freeze.
WARNING
It is prohibited to play with the device. Children are not allowed to clean the
device without supervision.
WARNING
The device can be operated independently only by persons who are familiar
with the safe operation of the device and understand possible hazards of its
operation. Children older than 8 and people with reduced physical and mental
capacities and lacking experience and knowledge can only operate the device
under the supervision of an informed person.
WARNING
It is prohibited to move, shift, clean and service the device while in operation.
WARNING
Children are not allowed to clean the device and perform maintenance without
supervision.
WARNING
Before installation and any further adjustments to the device, it is necessary
to consider the instructions for safe use and maintenance.
WARNING
Installation has to be performed in accordance with regulations and
instructions of the manufacturer. It has to be performed by a professionally
trained person.

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WARNING
The device must not be obstructed, objects must not be laid up against it.
Free access to the device must be provided at all time. If during the operation
of the device the water temperature exceeds 85 °C, the service department
has to be notified.
WARNING
It has to be made sure that the device does not endanger anybody. Access
to the device has to be denied to children and persons who are not informed
about the operation of the device.
WARNING
The device must not be placed in a room where it cannot be removed. Later
walling or setting up of other obstacles next to the device is forbidden.
WARNING
The servicing and maintenance of the device can only be performed by a
person authorised by the manufacturer. In case of a malfunction, first contact
the installer who installed the device.
WARNING
The device must never be cleaned with cleaning agents containing sand,
soda, acid or chlorides because these might damage the surface of the
device.
WARNING
The device contains the coolant R134a, which is classified as a greenhouse
gas according to the Kyoto protocol. This is why operating the device is only
allowed to persons authorised for working with the coolant as defined by the
national legislation in force. While performing works on the device, it is
necessary to prevent the coolant to leak into the atmosphere.
DANGER
Connecting the devices power cable must be performed by a qualified
electrician. During the procedure the device must not be live. The cord has to
be accessible and the socket must be of such type which enables the cord to
be pulled out in a simple manner.
CAUTION
To avoid danger, a damaged power cable can only be replaced by the
manufacturer or an authorised installer.

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2.4 Obligations of the manufacturer
The manufacturer guarantees that the device is in accordance with current European directives
and standards. The device is marked with the mark CE and it has all the necessary
documentation.
We reserve the right to make changes to the manual without prior notice.
As manufacturer, we do not take responsibility for the consequences in the following cases:
Non-compliance with the manual for the installation of the device.
Non-compliance with the manual for the device.
Wrong and/or inadequate maintenance of the device.
2.5 Obligations of the installer during installation
The installer is responsible for installing and commissioning the device in accordance with the
following requirements:
To thoroughly study the instructions for use and installation accompanying the device
before installation.
To install the device in accordance with the instructions and national legislation, policies
and standards in force.
To perform the first commission and eliminate all eventual irregularities found during
commission.
To train the user for operating the device and settings.
To alert the user to regularly maintain the device for keeping the device functioning
properly throughout its entire lifespan.
To instruct the user about the operation of the whole system.
To give the user all the documentation accompanying the device.
2.6 Customer support and service
The manufacturer of the device provides customer support and service during the warranty
period.
When filing a service claim, provide the following information:
The precise product code.
Serial number.
Year of manufacture.
All needed information is provided on the label printed on the device.
NOTE
In case of any change or replacement of original parts, forced or incorrect use of
the device, the warranty is terminated. Eventual costs arising from the service
procedure are fully covered by the user.
During the warranty period service and maintenance can only be performed by the
manufacturer or authorised service provider. Otherwise, the warranty is
terminated.
2.7 Obligations of the user
The user must ensure uninterrupted and efficient operation of the device by considering the
following instructions:
Thoroughly study the instructions for installation and use accompanying the device.
Installation and commissioning of the device have to be performed by a qualified and
authorised person.
Allow the authorised contractor for commissions or ask him to thoroughly explain the
functioning and how to operate the device.

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Ensure regular inspections and maintenance of the device by the authorised
maintenance worker.
These instructions for installation and use must be kept in a suitable dry place close to
the device.
2.8 Factory testing
For ensuring the high quality standard, every device is tested in production for the following:
Tightness of the cooling cycle.
Water-tightness.
Air-tightness.
Electrical safety.
Functionality.
2.9 Storage
The device has to be stored in a dry and clean place. The allowed storing temperature is
between 10 °C and 45 °C, for a short period (up to 24h) also up to 55 °C.
2.10Transport
The device packed in a cardboard packaging can be transported in the vertical or horizontal
position. In a horizontal position, the device can only be tilted to the right (seen from the front
side) as defined on the cardboard packaging.
CAUTION
Horizontal transport in the cardboard packaging is allowed only up to a distance of
150 km.
If the device is transported without a cardboard packaging, it has to be properly protected.
When transporting the device in horizontal position, the device can be tilted to the side, as
marked on the picture:

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The pump is not allowed to be tilted forward or backward for more than 30 °.
CAUTION
Horizontal transport without packaging is allowed only during final positioning in
the building and not during transport from supplier to customer.
CAUTION
While moving the device, it has to be disconnected from the power supply.
WARNING
The device contains shock-sensitive components, care has to be taken not to
cause impacts during transferring or that the pump does not fall.
WARNING
The mass of the device exceeds the allowed mass for one person to lift. All
responsibility for eventual injuries or damage to property or the device is taken by
the user.
CAUTION
The device can only be transported in a horizontal position if it is placed on its right
side (in the direction where the connections are visible). Placing the device in other
horizontal positions is strictly prohibited.
2.11Delivery package
Delivery package:
1. Heat pump
2. Pipe for water condensation drainage.
3. Instructions for Use and Installation
3 Technical description
3.1 General
The heat pump is a device intended for efficient heating of DHW in residential or small business
spaces. In heating the DHW, the device simultaneously cools the room where the air is
returned to and heat for heating water has been taken from. The device heats the DHW as
well as cools the room. Here we have to stress that it will only cool the room when there will
be a simultaneous need for heating DHW.
NOTE
For maximal efficiency and economical use, we advise to use air from rooms where
waste heat is generated for heating DHW (boiler rooms, laundries, kitchens,
basements, pantries ...)

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3.2 Components
B D
A
C
F
E
G
H
I
M
J
K
A
Air intake Φ180
B
Air outlet Φ180
C
Device generator casing
D
Fan
E
Compressor
F
Evaporator
G
Controller
H
Buffer tank for DHW (boiler)
I Anti-corrosion anode
J
Heat exchaanger (heating
water)
K
Condenser
M
Electric heater
The device consists of the device generator (compressor, evaporator, fan ...) and buffer tank
for DHW. The casing of the generator is made of expanded polypropylene (EPP) which also
functions as heat and noise insulation for the generator. The casing has two connections for
air channels which offer remote air intake and outlet from other rooms or the surroundings via
pipe connection. The DHW buffer tank has a built-in heat exchanger which can be connected
to an external fossil fuel, biomass or solar collector DHW.
Buffer tank for DHW
The buffer tank for DHW is an enamelled container insulated with polyurethane and protected
with sheet metal. The buffer tank for DHW is a standard fitted water heat exchanger for
connection to the DHW when choosing an alternative or additional heat source. The interior of

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the buffer thank for DHW has a built-in anti-corrosion anode (Mg) which prevents rusting of the
buffer tank in the event of damage to the enamel.
Electric heater
The device is standard fitted with an electrical heater of 1.5 kW which serves as additional or
backup heat source.
Antifreeze sensor
The device’s controller has an air temperature sensor which performs a safety shut-down of
the device for a minimum of 30 minutes in case the temperature of the air flowing through the
evaporator of the device is lower than +5 °C.
Safety thermostat
The device has a safety thermostat which is set to 90 °C. This means if the water temperature
inside the buffer tank for DHW exceeds this limit, the electrical connection to the device will be
terminated and the device will cease to operate. You have to contact the authorised installer
for a renewed commissioning of the device to check and eliminate the cause of the safety shut
down of the device.
CAUTION
When heating with DHW or solar collectors, the water in the buffer tank can be
heated above 95 °C which will trigger a shut-down of the safety thermostat. In this
case the thermostat has to be manually reset. For a renewed commissioning of
the thermostat it is necessary to call the authorised installer.
Controlling the water temperature in the buffer tank for DHW
An advanced controller with the label OPTITRONIC is responsible for controlling water heating
to the desired temperature.
Depending on the set desired temperature of water, the controller turns the operation of the
compressor and fan on or off; in certain cases it also turns on or off the electric heater or
circulation pump of the DHW. The maximal temperature setting for heating water is 65 °C. If
the water in the buffer tank exceeds 90 °C, the controller turns off all heat sources connected
to it.
The minimal water temperature in the buffer tank for DHW is 7 °C.
High-pressure protection for the cooling system
To prevent high pressure in the cooling system and associated damage the device has a built-
in high-pressure safety switch which turns off the device in case of high pressure.
Operating conditions
The temperature of the surroundings in normal operation must be between +5 °C and +35 °C.
The air must be clean, the relative moisture at +35 °C must not exceed 50 %. At lower air
temperatures the relative moisture can be higher. With devices installed at high altitudes, lower
air pressure can cause degraded performance of the device.

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3.3 Operating principle
5
6
48
3
10
1
2
9
1 Compressor 6 Fan
2 Condenser 8 Temperature sensor for the expansion valve
3 Dehydrator 9 Electric heater
4 Expansion valve 10 Buffer tank for DHW (boiler)
5 Evaporator
The cooling system of the device is a closed circuit system with the heat exchange liquid
R134A. At lower pressure and temperature (i.e. 10 °C) the coolant is evaporated in the
evaporator and thus removes heat from the air. Afterwards, the compressor compresses
the coolant to a higher pressure, this results in the raising of the coolant temperature to a
level higher than the water temperature in the buffer tank for DHW. The coolant then
releases the heat in the condenser into the water and condenses as a result. With the
expansion of the coolant the pressure and temperature in the coolant fall to their initial
level, completing the circular process. This process is repeated throughout the device’s
operation.

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4 The position of connections and dimensions
WP2 LF
-
202S
WP2 LF
-
302S
A [mm]
85 85
B [mm]
263 263
C [mm]
638 728
D [mm]
800 983
E [mm]
1057 1390
F [mm]
1387 1720
G [mm]
1700 2030
H [mm]
840 840
I [mm]
1597 1927
J [mm]
1252 1584
K [mm]
1790 2105
1
Cold water connection G1”
2
Heat exchanger connection - return G1”
3
Heat exchanger connection - supply pipe G1”
4
Circulation connection G3/4”
5
Hot water connection G1”
6
Screen
7
Flange
8 Air connection - Φ180
9 Connection for water condensate drainage - Φ16
10
Heat exchanger temperature sensor duct
11
Electrical connections

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5 Installation of the device
The lowest ceiling height in the room with the heat pump WP2 LF202S is 1900 mm; with the
heat pump WP2 LF-302S it is 2200 mm. The device is designed to take the heat from the
surrounding air or suck the air through air channels and blow it into the adjoining rooms or
surroundings. The device can be installed in the following ways:
Picture 1: Drawing air from the adjoining room and releasing it back into it (i.e. drying clothes).
Picture 2: Drawing air from the same room and releasing it back into it.
Picture 3: Drawing air from the adjoining room and releasing it back into it (i.e. pantry cooling).
Picture 4: Drawing air from the adjoining room and releasing it into the surroundings.

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The most common installation of the device enables it to draw air from rooms with a lot of
excess heat. A part of heat is drawn from this air and then released into the surroundings. The
air in kitchens, washing or sanitary rooms often has unpleasant odours, this is why it is released
into the surroundings. Here we must be careful to equalise the air flows and pressures in the
rooms; this has to be taken care of by the responsible ventilation design engineer.
CAUTION
The device cannot be installed on a location where air is polluted with toxic agents
which could damage the device (stables, warehouses with dangerous substances,
outdoors ...)
5.1 Minimal clearance from the device
The device can be installed in a room with installed air ducts or without them. This influences
the minimal clearance of the device from the walls; these depend on the direction of air intake
and outlet (chapter 5.4).
D
B
AC
AC
Picture 5: Minimal clearance from the walls
Air intake
Φ180
Air outlet
Φ180
A [mm] B [mm] C [mm] D [mm]
Without
bend
With bend
on the
outlet
Without
bend
With bend
on the
outlet
On the
side
On the
side
1000 250 90 90 200 / 250** 70
On the
side
Above 60 60 1000 250 200 / 250** 70
Above On the
side
1000 250 200 200 200 70
Above Above 60 60 /* 250 200 70
*If both air ducts are turned upwards, it is necessary to prevent the outlet and intake air to mix; this could lead to a
so-called “short-circuit” between outlet and intake air which significantly lowers the device’s performance. This is
why we recommend adding a bend on the outlet air connection and turn the outlet air away from the intake air.
**If the air connection of the intake air has a bend.

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At least 1 m of space must be provided in front of the device for control and servicing purposes.
If the air is drawn from the room device is located, the volume of the room must be at least
30 m
3
.
5.2 Levelling of the device
CAUTION
During operation, the device has to be placed in a vertical position to prevent
eventual saturation of the water condensate.
Picture 6: Levelling of the device
The device has a level bottom. For correct installation, the device requires a level and solid
surface. We recommend making a pedestal for the device (1-2 cm high) and thus preventing
eventual water saturating the insulation of the buffer tank for DHW.
The surface on which the device is laid must be level. Thus we ensure the device is levelled
on all sides. Otherwise, unwanted overflow of condensate can occur in the collecting vessel.
5.3 Hydraulic connection
The hydraulic connection has to be installed in accordance with the national and local
regulations for connecting buffer tanks for DHW in force. The room the device is installed in
must have a drain on the floor below the level of the device in case of water leakage. The
following picture shows the correct hydraulic connection of the device.
If the heat conductor (for heated water) in the buffer tank for DHW will not be used for heating
water, it must be filled with antifreeze liquid to prevent corrosion in the conductor. Close the
filled conductor only on the bottom side (equalisation of pressure because of temperature
differences).

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CAUTION
Because different materials are used on the pipe installation, all connections on the
device (cold and hot water, circulation, heat conductor) have to be in galvanic
isolation; otherwise corrosion of connections can occur on the inner side of the
buffer tank for DHW. We recommend placing galvanic isolators made of red brass
the length of at least twice the diameter of the pipe on the connections.
CAUTION
The buffer tank for DHW is intended for storing drinking water, this is why the water
has to be in accordance with the national regulations on drinking water in force;
otherwise, damage to the device and a termination of the warranty can arise.
1 Closing valve 5 Expansion tank
2 Pressure reducing valve 6 Charging pipe
3 Check valve 7 Circulation pump
4 Safety valve 8 Device generator
1 2 3 1
4 5 6
1
7
3
1
1
8
Picture 7: Connecting the device to the water supply
Dimensions of the expansion tank:
Adjusting the safety valve [bar]
6
System pressure [bar]
3.0 3.5 4.0
Volume of buffer tank for DHW [L]
Expansion tank [L]*
200
5 8 12
270
8 8 12
* The actual size of the expansion tank has to be defined by the installer/design engineer
according to the extent of the system the device will be installed in.
CAUTION
When installing the device, an expansion tank has to be installed as well.
CAUTION
The inlet pipe of the device has to be fitted with a safety valve with a nominal
pressure of 0.6 MPa (6 bar) which prevents pressure raising in the buffer tank for
DHW more than 0.1 MPa (1 bar) above the nominal pressure.

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CAUTION
For normal operation of the expansion tank, it is necessary to perform proper
adjustments of the tank’s working pressure. The pressure is adjusted according to
the pressure of the water supply. The settings have to be checked every 6 months.
5.4 Installation of air ducts.
The device has connections for air ducts installed on the casing. The diameter of the
connection hole is φ180 mm which enables the connection of standard air ducts φ150 mm
(internal diameter) from our sales catalogue (hoses Isopipe or Centrotherm); you can also use
sewage pipes with the diameter of φ160 mm (internal diameter). In case of using pipes without
insulation, the pipes have to be insulated to prevent water condensation on the surface of the
pipe.
The construction of the casing enables turning the air connections upwards and sideways
enabling changing the direction of air intake and outlet. This way the device can be optimally
placed into the room (minimal clearance from the walls), the number of elements and air ducts
which cause additional air pressure drops and lessen the characteristics of the device can be
reduced.
To change the direction of air duct connections, it is necessary to remove the screws on the
cover of the device and remove the cover (
picture 8). After removing the cover, the air ducts can be pulled out upwards and turned with
the opening facing upwards or sideways.
Picture 8: Changing the direction of air duct connections
The openings of the air duct connections are turned to the side by default. In case of a
malfunction near the air connection it is recommended to turn the connection and thus enable
easier air flow through the device.
Imbus 4
Screwing torque max. 0.5
Nm
2
1
2
3
3