Oilon ESi 6-17 User manual

M8010 2204EN
25 January 2022
Installation and operation manual
ESi 6-17, EMi 22-43, ELi 60-90 ÄssäControl
Installation and
operation manual
ESi 6-17, EMi 22-43, ELi 60-90
ÄssäControl

Contents
1 Introduction
1.1 Safety notice and warnings........................................................................ 3
1.2 Transportation............................................................................................. 5
1.3 Product description..................................................................................... 5
1.4 System structure and operation..................................................................6
1.5 Optional accessories...................................................................................9
2 Installation
2.1 Before installation......................................................................................11
2.2 Bivalent operation: use with supplementary heating................................ 11
2.3 Installation site requirements.................................................................... 11
2.4 Removing the packaging and inspecting the contents............................. 12
2.5 Removing transportation supports............................................................13
2.6 HVAC installation...................................................................................... 14
2.6.1 Brine circuit and fill and bleed unit installation......................................... 15
2.6.2 Filling and bleeding the brine circuit.........................................................15
2.6.3 Connecting the heat pump to a storage tank........................................... 17
2.6.4 Heating circuit connections.......................................................................17
2.6.5 Filling and bleeding the storage tank and the heating circuits..................18
2.6.6 Domestic hot water connections...............................................................18
2.6.7 Speed control for heating circuit pumps...................................................19
2.6.8 HVAC checklist......................................................................................... 20
2.7 Electrical installation and external sensors...............................................20
2.7.1 Supply connections...................................................................................21
2.7.2 Heating circuit and storage tank sensors................................................. 21
2.7.3 Outdoor temperature sensor.....................................................................22
2.7.4 Room temperature sensor (optional)........................................................22
2.7.5 Load guard................................................................................................23
2.7.6 Electrical installation checklist.................................................................. 24
2.8 Combining several heat pumps................................................................ 24
3 Commissioning
3.1 Preparations.............................................................................................. 25
3.2 First start checklist....................................................................................25
3.3 Typical problems during commissioning...................................................25
4 Operation
4.1 The ÄssäControl system...........................................................................27
4.2 Operating the touchscreen....................................................................... 27
4.3 Changing the language.............................................................................28
4.4 Quick functions..........................................................................................28
4.4.1 Room temperature change....................................................................... 28
4.4.2 Room temperature change with room temperature measurement
active......................................................................................................... 29
4.4.3 Hot water intensification – temporary boost to hot water output...............29
M8010 2204EN 1 (75)

4.4.4 At home and Away................................................................................... 30
4.4.5 Timers........................................................................................................31
4.4.6 Measurements...........................................................................................32
4.4.7 Heating curves.......................................................................................... 33
4.4.8 Boiler settings: storage tank settings........................................................34
4.4.9 Accessories............................................................................................... 36
4.5 Menu functions..........................................................................................37
4.6 Menu functions: Other settings.................................................................37
4.6.1 Heating circuit min and max temperature.................................................38
4.6.2 Backup device settings: options for backup heater.................................. 39
4.6.3 Partial power settings............................................................................... 39
4.6.4 Summer functions..................................................................................... 39
4.6.5 Magna geo control: brine circuit pump settings........................................40
4.6.6 Extra heat settings: control for external heat sources.............................. 40
4.6.7 Compressor rotation (optional)................................................................. 41
4.7 Cooling (optional)......................................................................................41
4.7.1 Free cooling.............................................................................................. 42
4.7.2 Flexible cooling......................................................................................... 43
5 Maintenance
5.1 Maintenance and care.............................................................................. 45
5.2 Typical problems during operation........................................................... 45
5.3 Alarms....................................................................................................... 47
5.4 ÄssäControl maintenance functions......................................................... 48
5.4.1 Manual control.......................................................................................... 48
5.4.2 Input and output states.............................................................................49
5.4.3 Running information..................................................................................51
5.4.4 Hot water temperature limiter................................................................... 51
5.4.5 Position valve settings: settings for control valves................................... 52
5.4.6 Partial / full power: switching between monovalent and bivalent
operation....................................................................................................53
5.4.7 Resistor control: control method for external heat source........................ 53
5.4.8 Temperature gauges.................................................................................54
5.4.9 External alarm...........................................................................................54
5.4.10 Soft starter alarms.................................................................................... 55
5.4.11 Super heat circuit control: desuperheater control options........................ 55
5.4.12 Boiler maximum limits...............................................................................55
5.4.13 Cooling (optional)......................................................................................55
5.4.14 Return factory settings: resetting the heat pump......................................57
6 Technical data
6.1 Technical data...........................................................................................58
6.2 Heat pump dimensions............................................................................. 59
6.3 Electrical data............................................................................................63
6.4 Performance data......................................................................................64
6.5 Brine circuits............................................................................................. 66
6.6 Heating circuits..........................................................................................67
6.7 EU product data, ESi................................................................................68
6.8 EU product data, EMi............................................................................... 70
6.9 EU product data, ELi................................................................................ 73
2 (75) M8010 2204EN

1 Introduction
1.1 Safety notice and warnings
Read these instructions carefully before installation, commissioning, operation, or
maintenance of the device. The given instructions must be followed. Throughout this
manual, the following three symbols are used to point out very important information:
Be careful. The DANGER symbol indicates a possible danger of bodily
harm or lethal injury.
Pay attention. The CAUTION sign indicates a possible danger of
damage to the device, components or surroundings.
Note indicates tips, hints, and other essential information.
Keep these instructions as well as the electrical diagrams available near the device.
Installation, commissioning, or service of the appliance is to be carried
out by authorized and trained personnel only, adhering to all local
regulations and requirements.
Wear proper hearing protection and personal protective equipment,
such as protective footwear, gloves, and safety goggles when
necessary.
Electrical safety
Once powered on, some of the unit’s components carry a hazardous
voltage. Always pay attention to electrical safety when working with or
near electrical components.
Before any maintenance or servicing, switch off electricity using the
main switch and ensure that there is no voltage present in the unit’s
components.
M8010 2204EN 3 (75)

Refrigerant
Refrigerant leaking from an open or broken circuit may cause
asphyxiation, severe frost damage, arrhythmia, or neurological
symptoms. If you suspect a refrigerant leak, leave the area immediately,
and seek fresh air. Help and warn others.
Safety devices
Do not bypass, disable, or damage any of the unit’s pressure switches
or other safeguards with tools, by accessing the system’s software, or
by any other means.
Bypassing the unit’s safeguards may lead to equipment failure, damage to property or
injury to people.
Lifting and handling
The weight of the unit presents a crush hazard. Use safe work methods
when lifting and handling the unit.
During lifting, do not walk or work under the heat pump or any other
suspended load.
Other considerations
To avoid slipping, keep floor surfaces dry, and seal off or report any
leaks that you detect.
The heat pump does not contain any user-serviceable parts.
The manufacturer shall not be liable for any defects in the equipment
resulting from improper installation or any costs arising thereof.
Only certified technicians who have received the appropriate training for
installing Oilon and Lämpöässä heat pumps may use the heat pump’s
maintenance functions.
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1.2 Transportation
During lifting, do not walk or work under the heat pump or any other
suspended load.
Transport the heat pump in an upright position.
● If the heat pump needs to be tilted to pass through a doorway, do not tilt the unit
beyond 45°.
● If the heat pump needs to be tilted beyond 45°, detach the compressor unit.
Use a pallet jack or similar machine to transfer the heat pump. Lift the unit from the
bottom.
1.3 Product description
ESi, EMi, and ELi ground source heat pumps are especially suited for use as the
primary source of heating for new and renovated residential buildings and holiday
homes. To ensure trouble-free operation, each heat pump undergoes configuration,
testing, and a test run at the factory.
As E series heat pumps do not include a built-in storage tank, a separate storage tank
is required. The size and construction of the storage tank is selected based on the
application.
Type plate
The heat pump’s type plate is located under the heat pump’s top cover. The unit’s
serial code is marked on the type plate.
This product is CE-marked.
M8010 2204EN 5 (75)

1.4 System structure and operation
Ground source heating system
Ground source heat pump system ver. 1
Principle drawing of a ground source heating system.
1: brine circuit (horizontal ground loop, borehole or lake/pond system); 2: ground source heat pump;
3: heating circuits (radiator heating or floor heating); 4: domestic hot water heating; 5: passive cooling
(optional).
A ground source heat pump can extract thermal energy (heat) from soil, bedrock, or a
body of water. Of the total energy required for heating, a heat pump collects more than
75% from natural sources. Running the heat pump and the various system components
requires electricity, which means that the remaining 25 percent is electrical power
consumed by the process of extracting thermal energy.
A ground source heat pump system has three main components: the brine circuit,
the compressor unit (the actual heat pump), and the heating circulation. The three
circulations are isolated from each other, which means that none of the fluids used
(brine, refrigerant, and water) are mixed together at any part of the process. Instead,
heat is transferred between the fluids using plate heat exchangers.
Brine circuit
When the sun heats up the earth, thermal energy is stored in the soil, the bedrock,
and in bodies of water. To extract this heat, the ground source heat pump circulates a
cold mixture of water and ethanol (brine) inside a long loop of pipe embedded in the
earth (the brine circuit). As the brine passes through the brine circuit, its temperature
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increases by a few degrees. The brine is then pumped into a heat exchanger inside the
heat pump: the evaporator. In the evaporator, thermal energy is transferred from the
brine to low-pressure refrigerant, evaporating the refrigerant.
In vertical systems, a deep well is bored into the bedrock. In horizontal systems, an extensive coil of
plastic pipe (PEM 40/10) is buried to a depth of 1–1.2 meters or more or submerged in a body of water
(minimum depth: 3 meters).
The brine solution includes ethanol to prevent it from freezing. After being pumped through the brine
circuit, the temperature in the brine to the evaporator is approximately 0 ºC, but can be higher in the
summer and lower in the winter.
The compressor unit
From the evaporator, the refrigerant vapor is transferred into the compressor which
compresses the vapor to a high pressure. At this stage of the process, the refrigerant’s
temperature increases to over 100 ºC. After the compressor, the refrigerant is referred
to as hot gas.
Hot gas is transferred from the compressor to heat exchangers (desuperheater and
condenser). Heating water from the storage tank circulates through these heat
exchangers, taking thermal energy from the hot gas. As the refrigerant releases its
thermal energy, the water heats up, and the refrigerant cools down, condensing into a
liquid.
The liquid refrigerant is transferred through a filter drier into the expansion valve,
where the pressure of the liquid refrigerant decreases. The refrigerant is transferred
into the evaporator, and the cycle starts over from the beginning.
Desuperheater
As heat is extracted from the hot gas, its temperature decreases to a point where the
refrigerant starts to condense into liquid. This point is close to the temperature required
for space heating (typically around 35–55 ºC). However, after the compressor, the
temperature in the hot gas is approximately 120 ºC, which means that it must first cool
down. Instead of letting the heat dissipate, it can be extracted with a desuperheater.
The extracted superheat can then be used to bring pre-heated domestic hot water to
its final temperature.
Note that EMi 22P and EMi 43P models have no desuperheater; instead, all thermal
energy is transferred to the heating water via the condenser.
Storage tanks, heating circuits, and domestic hot water
It is possible to connect multiple storage tanks for storing the thermal
energy produced by the heat pump. These storage tanks vary in size
and construction.
Cool water from the bottom of the storage tank circulates through the compressor
unit which heats up the water. Once heated, the water returns to the tank at a higher
level. The water in the hot water storage tank circulates through the building’s heating
system, which consists of one or more heating circuits.
M8010 2204EN 7 (75)

Heat pump Storage tank, 2 sections
Heat pump and storage tank with two sections ver. 1
Pos. Item
1 Evaporator
2 Compressor
3 Desuperheater
4 Condenser
5 Expansion valve
6a Upper storage tank section
6b Lower storage tank section
7 Domestic hot water coils
8 Domestic cold water inlet
9 Domestic hot water outlet
Heat pump Storage tank, 1 section
Heat pump and storage tank with one section ver. 1
Pos. Item
1 Evaporator
2 Compressor
3 Condenser
4 Expansion valve
5 Domestic hot water coils
6 Domestic cold water inlet
7 Domestic hot water outlet
The heat pump features desuperheater technology which maximizes the benefits and
utilization of a heat pump in overall heating. For optimal results, a storage tank with two
sections separated with a baffle should be used.
The top part of the storage tank, or, the upper storage tank, is heated with superheat
energy: thermal energy extracted by the desuperheater. The desuperheater provides
heating water at a very high temperature. The high-temperature layer in the tank is
reserved for heating domestic hot water to its final temperature. If required, high-
temperature output from the upper tank can be used in the heating system. This can be
useful especially in radiator systems.
The lower section of the storage tank, or, the lower storage tank, is used to store
warm water for the building’s central heating. The heat pump’s condenser heats up the
section to a flow temperature level required by the heating circuits. The temperature
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in the section is regulated based on a heating curve. In normal heating conditions,
the temperature in the section depends on the current need for heating (‘floating
condensing’ operation).
Heat distribution can be arranged using water circulation (floor heating or hot water
radiators) or through air heating. The best coefficient of performance can be achieved
with floor heating, since the lower the temperature of the heat transfer, the better the
coefficient of performance.
Domestic hot water heating
Domestic hot water is heated by drawing domestic cold water through a coil or coils
inside the storage tank. In tanks with two sections, the domestic water is pre-heated
in a coil in the lower section, and brought to its final temperature in the tank’s upper
section.
Usually, domestic hot water needs to be heated to a higher temperature than the water
circulating in the heating circuits. Thanks to the two-stage heat transfer enabled by
superheating technology, the larger lower section used for space heating can be kept
at a lower temperature, since domestic hot water is heated up to its final temperature in
the smaller upper section, where the temperature is kept higher. This allows operating
temperatures to be kept as low as possible, improving the system’s annual coefficient
of performance.
E series heat pumps are well-suited for buildings with low demand for domestic hot
water. In such cases, a storage tank with only one section is used, and the heat pump’s
superheating system is not connected.
Using existing tanks
In renovated residential buildings, the heat pump can be connected to an existing
storage tank, provided that the tank is in good condition and is suitable for use
with a ground source heat pump. The heat pump’s superheating system will not be
connected.
1.5 Optional accessories
The ÄssäCooling system
A passive cooling system can be connected to the brine circuit. The brine in the circuit
passes through an additional heat exchanger. The heat exchanger releases cooling
energy to indoor air. The heat exchanger can be a radiant cooling unit installed inside
an air duct or an indoor unit (fan coil unit).
The ÄssäControl system features multiple solutions for cooling control, available as
accessories.
The ÄssäCooling product family includes both wall-mounted and ceiling mounted
indoor units for cooling with the necessary installation accessories included. Passive
cooling is a very economical option, since the only operating costs are associated with
running the system’s circulation pump and fans.
M8010 2204EN 9 (75)

ÄssäSolar solar collector
ÄssäSolar is a solar collector that can be connected to almost any E series ground
source heat pump. Solar heating is an environmentally friendly supplementary energy
source for space heating and domestic hot water heating. ÄssäSolar utilizes energy
extracted from solar radiation, resulting in more economical and environmentally
friendly energy production. ÄssäSolar can be used in both single-family homes and
larger buildings.
External heat sources
Several different supplementary external heat sources can be connected to the ground
source heating system, such as electric immersion heaters and electric or oil-fired
boilers.
By default, the system supports control of one external supplementary heat source.
Control for up to 4 external heat sources is available as an optional accessory.
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2 Installation
2.1 Before installation
The manufacturer shall not be liable for any defects in the equipment
resulting from improper installation or any costs arising thereof.
Any pipe installation associated with the heat pump may be performed
by qualified and trained personnel only.
Check the following before installation:
1. All the necessary hoses and sensors have been delivered.
2. There is sufficient clearance around the heat pump, and the heat pump has been
properly leveled.
3. The connections on top of the unit are intact.
4. The main fuse and the heat pump fuse has the correct rating (see Technical data).
5. The brine circuits and the heating circuits have been appropriately installed.
After installation, go through the installation checklist to avoid potential
problems.
2.2 Bivalent operation: use with supplementary heating
In certain cases, the heat pump’s heating capacity needs to be supplemented actively
with an electric immersion heater installed in the storage tank. A typical example is the
high temperature required by radiator systems.
If the heat pump is used with supplementary heating, the heating system must be
sized and adjusted so that the return water temperature is always below +55 °C. The
building’s electrical system needs to be equipped with priority relays (see section Load
guard).
Activate supplementary heating from the Maintenance menu.
2.3 Installation site requirements
Install the unit and the associated equipment in a warm, dry place.
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The unit’s installation site should have a floor drain. The site’s floor should be inclined
so that any runoff from the unit leads towards the drain.
Place the unit on a stable, steady base that can carry the entire weight of the heat
pump and a full storage tank, see the tank volume in the technical data. Mount the unit
securely in a vertical position onto its own leveling feet. Level the machine using the
machine’s leveling feet.
Fire insulation is not required.
Space requirements
The minimum height of the heat pump is approximately 145 cm with the adjustable feet
installed. Note that transportation supports add approximately 8 cm to the full height of
the unit.
At the back of the unit, there are connection hoses that extend 5–20 cm above the
unit’s top cover.
● Leave at least 80 cm of clearance in front of the unit.
● Leave at least 50 cm of clearance above the unit for the necessary connections.
E series space requirements ver. 1
Pos. Item
GSHP Ground source heat pump
ST Storage tank
Model A B C O X F Y V
ESi 400/50* 50 50 700* 2300* 700 1500* 200
EMi 400/50* 50 50 700* 3200* 700 2000* 200
ELi 400/50* 50 50 700* 3600** 700 2500* 200
* 400 mm reserved for brine circuit pipes (if required).
** The minimum width depends on the storage tank selected.
2.4 Removing the packaging and inspecting the contents
1. Remove the plastic wrapping and corner padding from around the product.
2. Check that the heat pump has not suffered any damage during transit. If you detect
any damage, notify the carrier immediately. It is advisable to take photos of the
damage.
3. Check the delivery contents immediately. If there are accessories missing, notify
the dealer within 5 days of delivery.
The heat pump’s accessory package includes the following:
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Accessory included in delivery ESi EMi ELi
Valve actuator X X X
4-way valve (if the tank has two sections
separated with a baffle) or
3-way valve (if the storage tank has only
one section)
X  
Brine circuit pump X  
Outdoor temperature sensor X X X
Flow temperature sensor X X X
Storage tank temperature sensors (2
pcs.) X X X
Adjustable feet (4 pcs.) X X X
Brine circuit fill and bleed unit X  
Filling bottle (inside the unit) X  
Safety valve X  
The unit’s plastic top cover can be removed by lifting the cover from the edges.
Heat pump cover removal ver. 1
2.5 Removing transportation supports
During lifting, do not walk or work under the heat pump or any other
suspended load.
Two lengths of wood have been screwed onto the bottom of the unit to provide support
during transport.
M8010 2204EN 13 (75)

1. Screw the adjustable feet (in the accessory
package) to the bottom of the heat pump.
2. Unscrew the fastening screws from the wooden
transportation supports.
3. Finish by lifting the heat pump off of the transportation supports with a pallet jack or
similar machine.
2.6 HVAC installation
When making HVAC connections, refer to the piping diagrams supplied with the unit.
More detailed instructions are provided in the following sections.
The heat pump’s circuit connections are located on top of the heat pump, see the
figures below.
There is a copy of the diagram under the heat pump’s plastic cover
plate.
Connections, ESi
Pos. Connection Thread
1Flow from
condenser 3/4"
2 Return to condenser 3/4"
3Flow from
desuperheater 1/2"
4Return to
desuperheater 1/2"
5From evaporator to
brine circuit 1"
6From brine circuit to
evaporator 1"
If a desuperheater connection is used, plug the desuperheater pump’s power cable
to the connection box.
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Connections, EMi
Pos. Connection Thread
1Flow from
condenser 1 1/2" F
2 Return to condenser 1 1/2" F
3Flow from
desuperheater 3/4" F
4Return to
desuperheater 3/4" F
5From evaporator to
brine circuit 2" F
6From brine circuit to
evaporator 2" F
Connections, ELi
Pos. Connection Thread
1Flow from
condenser 2" F
2 Return to condenser 2" F
3Flow from
desuperheater 3/4" F
4Return to
desuperheater 3/4" F
5From evaporator to
brine circuit 2" F
6From brine circuit to
evaporator 2" F
2.6.1 Brine circuit and fill and bleed unit installation
Use special care when making the connections.
The connections for brine circuit are located on top of the unit, see section HVAC
installation.
1. Install the brine circuit pipes to flexible hoses on the top of the unit.
2. Install the fill and bleed unit to the brine circuit return line (brine to heat pump).
If cooling units are added to the system to a height above the heat pump, install
a membrane expansion vessel in the system.
● Install a bleed port to the highest point in the system.
● The filling bottle needs to be taken out of use by closing the shut-off valve
under the bottle, see the piping diagrams provided with the heat pump. (ESi
models only)
2.6.2 Filling and bleeding the brine circuit
Equipment and materials required:
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● Mixing container, 60 liters
● Submersible pump with filter, pump head approximately 30m
● Brine solution (water/ethanol mixture, 1:1, frost resistance: –16 °C
● Reinforced hose, 1" (2 pcs.), length approximately 3 m
● Connector, 3/4", female (for fill and bleed unit, 2 pcs, ESi only)
Before starting the process, check that the brine circuit has been appropriately
connected.
Fill and bleed unit ver. 1
Pos. Item
1Rearmost shut-off valve (brine circuit
connection)
2Foremost shut-off valve (brine circuit
connection)
3 Foremost ball valve (filling connection)
3a Expansion vessel port
4 Rearmost ball valve (filling connection)
5 T strainer
1. EMi and ELi: assemble the fill and bleed unit from individual valves.
In ESi heat pumps, the necessary valves are provided as an integrated unit.
2. Check that the foremost shut-off valve (2) in the unit is open.
3. Connect a reinforced hose between the foremost ball valve (3) and the submersible
pump. Open the ball valve (3).
4. Connect a reinforced hose between the rearmost ball valve (4) and the mixing
container. Open the valve (4).
5. Fill the mixing container with brine solution.
6. To bleed the filling hoses, open the rearmost shut-off valve (1) and start the pump.
Once the hoses have been bled, close the rearmost shut-off valve (1). This
allows the brine to circulate in the actual brine circuit.
7. Keep adding brine until the circuit has been filled.*
8. Leave the pump on, until the fluid is clear and no gurgling can be heard from the
pipes.
● Bleed the evaporator through the bleed nipple in the pipe between the brine
circuit and the evaporator.
● To ensure no air bubbles are left in the system and to avoid malfunctions
during startup, it is advisable to continue circulation for several hours.
9. Open the rearmost shut-off valve (1).
10. Close both ball valves (3 and 4).
Make sure that no pressure is left in the circuit.
11. Remove the fill hoses.
12. Screw the expansion vessel onto the port on top of the foremost ball valve (3a).
13. Remove the safety valve on top of the expansion vessel.
14. Fill the expansion vessel 3/4 full with brine solution.
15. Reinstall the safety valve in the expansion vessel.
16. Open the foremost ball valve (3) in the fill and bleed unit.
17. Close the shut-off valves with red handles (1 and 2) and the valve below the filling
bottle (if present). Remove and clean the mesh in the T strainer (5). Repeat, until
the strainer remains clean.
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Note that if the valves are open, brine will be pushed out of the circuit.
18. Finish by making sure that both of the shut-off valves (1 and 2) are open.
*You can use the heat pump’s brine circuit pump to speed up the bleed process.
1. Make sure that the motor protection circuit breaker (QM1) has been disabled.
2. Make sure that the submersible pump and the unit’s internal brine pump rotate in the same
direction.
3. Turn the main switch (Q1) and control power switch (F10) to the ON position.
4. In the ÄssäControl Maintenance menu, select Manual control. Activate manual control, and select
Brine 1 On.
Once complete, disable manual control and return the switches and breakers to their original positions.
2.6.3 Connecting the heat pump to a storage tank
1. Connect the storage tank to the heat pump as indicated in the piping diagrams
supplied with the unit.
For the location of the appropriate ports on top of the heat pump, see section
HVAC installation.
2. If you connect the desuperheater circuit, change the desuperheater settings in the
Maintenance menu (Super heat circuit control).
For the relevant factory settings, refer to chapter Technical data.
3. If connecting several heat pumps to one storage tank, install a non-return valve and
a control valve for each heat pump.
2.6.4 Heating circuit connections
Make the heating circuit connections as indicated in the piping diagrams supplied with
the unit. Make all heating connections through the heating circuits, not through the
domestic hot water connection. This includes connections to heated towel racks and
duct heaters.
Storage tank fill valve unit
Install a bleed valve in the same branch as the fill valve unit. This branch may also
include an expansion tank.
Heating circuits
Heating circuit 1 (HD1) is the primary heating circuit, and should be reserved for
spaces where a higher flow temperature is required (such as for radiator heating in
living spaces). In case of a compressor malfunction the heat pump’s electric immersion
heater will be able to heat HD1 more efficiently.
Heating circuits 2 (HD2) and 3 (HD3) are optional secondary circuits. In radiator-
heated buildings, HD2 can be used as a supplementary floor heating circuit or a circuit
reserved for a different zone, such as wet areas.
Heating circuits can be regulated individually. Each circuit can also be disconnected
individually. As an example, you can switch off the heating in living spaces for the
summer, but leave the heating on in wet areas.
M8010 2204EN 17 (75)

Renovated buildings
Flush the building’s heating circuits thoroughly before connecting the ground source
heat pump. It is advisable to install a T strainer in each heating circuit.
2.6.5 Filling and bleeding the storage tank and the heating circuits
Keep the storage tank pressure below 1.5 bar throughout the filling
process. The manufacturer shall not be liable for any damage in the
event that the instructions presented below have not been followed.
Fill the storage tank with water through the fill valve unit included in the system. Before
filling, check that there is a bleed valve in the same branch as the fill valve unit. Make
sure that air has an unobstructed path to escape during filling; relying only on
the bleed valve or a safety valve is not sufficient.
1. Open the heating circuit fill valve.
2. Fill the circuit with water.
3. Bleed the storage tank (and, if necessary, the condenser and desuperheater line)
and the heating circuit until all air has escaped.
4. Leave storage tank pressure to a level of 1–1.2 bar.
● Max. storage tank pressure: 1.5 bar. Check the pressure from the storage
tank’s type plate.
● Max. domestic hot water circuit pressure: 9 bar.
2.6.6 Domestic hot water connections
It is not allowed to install external radiators or driers in the domestic hot
water circuit.
Make the domestic hot water connections as indicated in the piping diagrams supplied
with the unit.
● To avoid burns, install a mixing valve in the domestic hot water flow line.
● Install a non-return valve upstream from the domestic cold water inlet.
Domestic hot water recirculation (optional)
If the building features a domestic hot water recirculation system and the system has
a high temperature loss, it is advisable to install a supplementary heater (such as an
ÄssäStream in-line heater or a 30-liter ÄssäStream storage tank) in the flow line.
Optional accessories
● Regulating valve
● Actuator for the regulating valve
● Water temperature regulation (feature)
18 (75) M8010 2204EN