DOMUSA TEKNIK FUSION COMBI W 50 User manual

FUSION COMBI W 50
FUSION COMBI F 80
HYBRID MODULE
EN | INSTALLATION AND OPERATING INSTRUCTIONS

Thank you for choosing a DOMUSA TEKNIK heat pump accessory. You
have chosen the FUSION model from the DOMUSA TEKNIK product line.
This is an all-in-one hydraulic accumulation module, which in combination
with a DUAL CLIMA R heat pump and provide the adequate level of comfort
for your home, provided that the hydraulic installation is correctly performed.
This document constitutes an essential part of the product and must be
delivered to the end user. Please carefully read the warnings and advice
contained in this manual, as they provide important information regarding
the safety of the installation, as well as use and maintenance.
The installation of this appliance should be carried out only by qualified
personnel, in accordance with the regulations in force and following the
manufacturer’s instructions.
Both the start-up and any maintenance operation of this appliance should be
carried out only by the Official Technical Assistance Services of DOMUSA
TEKNIK.
Incorrect installation of this product may cause damage to people, animals
and objects, for which the manufacturer shall not be held liable.
At the end of its useful life, the product must be taken to a selected collection
point for electrical and electronic equipment or must be returned to the
distributor at the time of purchasing a new equivalent appliance. For more
detailed information on the collection schemes available, contact either the
collection facilities of the local authority or the distributor where the purchase
was made.

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FUSION COMBI W 50/FUSION COMBI F 80
INDEX
1 SAFETY WARNINGS ................................................................................................................. 4
1.1 SAFETY SYMBOLS ....................................................................................................................................... 4
1.2 OTHER SYMBOLS........................................................................................................................................ 4
1.3 USAGE AND INSTALLATION WARNINGS ............................................................................................................. 5
1.4 PERSONAL SAFETY WARNINGS........................................................................................................................ 5
2 LIST OF COMPONENTS............................................................................................................. 6
3 INSTALLATION INSTRUCTIONS ................................................................................................ 8
3.1 LOCATION AND WALL MOUNTING (ONLY FOR FUSION COMBI W50 MODEL) ........................................................... 9
3.2 HYDRAULIC INSTALLATION.......................................................................................................................... 10
3.3 DRAINAGE THE TANK................................................................................................................................. 12
3.4 ASSEMBLY AND CONNECTION OF THE CONTROL PANEL........................................................................................ 12
3.5 ELECTRICAL CONNECTION........................................................................................................................... 15
3.5.1 Connecting the circulation pumps of the installation (BC, BF) ............................................................... 15
3.5.2 Connecting the module with the DUAL CLIMA R heat pump and the boiler............................................ 15
3.5.3 INSTRUCCIÓN DE CONEXIÓN ELÉCTRICA CON UNA CALDERA CON MANTENIMIENTO DE TEMPERATURA MÍNIMA DE CALDERA . 17
3.6 CONNECTING ROOM THERMOSTATS ............................................................................................................... 18
3.6.1 Connecting a 3-wired switched room thermostat for Heating/Cooling ................................................... 18
3.6.2 Connecting two room thermostats (one for heating and the other for cooling) ...................................... 20
3.6.3 Connecting a 2-wired two room thermostats for two zones (manual mode) .......................................... 21
3.6.4 Connecting one room thermostat ....................................................................................................... 22
4 OPERATION .......................................................................................................................... 23
4.1 HEAT PUMP CONFIGURATION....................................................................................................................... 23
4.2 BOILER ONLY MODE SWITCH ....................................................................................................................... 23
5 ELECTRICALSCHEME.............................................................................................................. 24
6 DIAGRAMS AND MEASUREMENTS ........................................................................................... 25

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FUSION COMBI W 50/FUSION COMBI F 80
1SAFETY WARNINGS
1.1 Safety symbols
All safety messages indicate a potential risk of breakdown or damage. Follow the instructions carefully
to avoid accidents or damage.
DANGER
Warns of operations or situations of imminent danger, which, if not avoided, can cause
severe injury or even death
1.2 Other symbols
The following symbols are used in instructions to draw attention to important information.
NOTE: Indicates the risk of breakdown and damage to property or people.
ATTENTION: Indicates important additional information that may be related to the correct
operation of the module

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FUSION COMBI W 50/FUSION COMBI F 80
1.3 Usage and installation warnings
The FUSION COMBI module should be installed by personnel authorised by the Ministry of Industry,
in compliance with the laws and regulations in force in the matter. The precautions detailed here cover
very important issues, so please be sure to follow them accordingly.
Please carefully read this instruction manual and keep it in a safe, easily accessible place.
shall not be held liable for any damage that may occur due to failure to follow these instructions.
The FUSION COMBI storage module can only be installed in combination with a heat pump from the
DUAL CLIMA R line from DOMUSA TEKNIK. The Fusion Combi module, in combination with a DUAL
CLIMA R heat pump, is suitable for use in both heating and cooling installations, and can be combined
with fan coils, underfloor heating/cooling and low-temperature radiators. It should be connected to a
heating/cooling system and to a hot water distribution network that is compatible with its performance
and power.
This appliance should only be used for the purpose for which it has been expressly designed. Any other
use is considered unsuitable and therefore hazardous. The manufacturer shall not be considered liable
under any circumstances for damage caused by unsuitable, erroneous or improper use.
Remove all the packaging and check that the contents are complete. In case of doubt, do not use the
appliance and refer to the supplier. Keep the packaging elements out of reach of children, as they can
be dangerous.
Improper installation or placement of equipment or accessories may cause electrocution, short circuit,
leakage, fire, or other damage to the equipment. Use only accessories or optional equipment
manufactured by DOMUSA TEKNIK and specifically designed to work with the products presented in
this manual. Do not modify, replace or disconnect any safety or control device without first consulting
the manufacturer or the Official Technical Assistance Service of DOMUSA TEKNIK.
When it is decided not to use the equipment anymore, the parts likely to constitute potential sources
of danger should be properly decommissioned.
1.4 Personal safety warnings
Always wear suitable personal protection equipment (protective gloves, safety glasses, etc.) when
carrying out installation and/or maintenance operations in the unit.
Do not touch any switch with wet fingers. Touching a switch with wet fingers may cause electric shock.
Before accessing the electrical components, fully disconnect the power supply.
Do not touch water pipes or internal parts during and immediately after operation. Pipes and internal
parts may be excessively hot or cold, depending on the use of the unit.
The hands may be burned by cold or heat in case of improperly touching pipes or internal parts. To
avoid injury, wait until the pipes and internal parts return to their normal temperature. Alternatively, if
access is required, be sure to wear appropriate safety gloves.

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FUSION COMBI W 50/FUSION COMBI F 80
2LIST OF COMPONENTS
FUSION COMBI W 50
1. Steel storage tank, with thermal
insulation, 50L.
2. Heating/cooling pump circuit 1.
3. Heating/cooling flow circuit 1.
4. Heating/cooling Flow circuit 2.
5. Drain/drain socket.
6. Heating/cooling return circuit 1.
7. Heating/cooling return circuit 2.
8. Return to boiler.
9. Return to DUAL CLIMA R Heat Pump.
10. Inlet from boiler.
11. Entrance from DUAL CLIMA R Heat Pump.
12. DUAL CLIMA R Heat Pump control panel.
13. Boiler only operation switch.
14. Connection strip.

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FUSION COMBI W 50/FUSION COMBI F 80
FUSION COMBI F 80
1. System drain valve.
2. Connection strip.
3. Steel storage tank, with thermal insulation, 80L.
4. Heating/cooling pump circuit 1.
5. DUAL CLIMA R Heat Pump control panel.
6. Boiler only operations switch.
7. Heating/cooling Flow circuit 1.
8. Inlet from boiler.
9. Entrance from DUAL CLIMA R Heat Pump.
10. Heating/cooling Flow circuit 2.
11. Return to boiler.
12. Heating/cooling return circuit 1.
13. Return to Heat Pump DUAL CLIMA R.
14. Heating/cooling return circuit 2.

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FUSION COMBI W 50/FUSION COMBI F 80
3INSTALLATION INSTRUCTIONS
The FUSION COMBI hydraulic module can only be installed in combination with a heat pump from the
DUAL CLIMA R line supplied by DOMUSA TEKNIK and an existing heating boiler. Therefore, for their
operation, these devices should be connected to each other, both hydraulically and electrically. In this
section, the necessary operations for said connection are described in detail.

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FUSION COMBI W 50/FUSION COMBI F 80
3.1 Location and wall mounting (only for FUSION COMBI W 50 model)
It is recommended to install a drain in the outlet provided for this in the upper part of the module, to
prevent the appearance of siphons in the installation.
It will be essential to allow access from the front, so it should not be installed in front of any
obstacle that makes such access impossible.
Wall fixing system:
Although the FUSION COMBI W 50 module is supplied from the factory, foreseeing its installation
with the DUAL CLIMA R heat pump and boiler outlets from the top, the FUSION COMBI W 50
module can be mounted with said outlets on the bottom of the module. To do this, the module has
hangers at both ends. Once the module is hung on the wall, if necessary, turn the front cover and
position it in the new position.
NOTE: It is recommended to install a plunger in the upper outlet (5) and a drain cock in
the lower one.

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FUSION COMBI W 50/FUSION COMBI F 80
3.2 Hydraulic installation
The hydraulic installation should be carried out by qualified personnel, in compliance with the current
installation regulation and considering the following recommendations:
•For the hydraulic connection between the FUSION module and the DUAL CLIMA heat
pump, use two conveniently insulated tubes to connect the IBC and RBC sockets of the
module (see “Diagrams and Measurements” ) with the flow and return sockets of the heat
pump, respectively.
•All water circuit piping be insulated to prevent condensation during operation in cooling
mode and reduction of cooling and heating capacity, as well as to prevent freezing of outside
pipes during winter. The minimum insulation thickness of the pipes should be 19 mm (0.039
W/mK), preferably comprising a closed cell insulation or a vapor barrier. In outdoor areas
exposed to the sun, the insulation must be protected from the effects of degradation.
•Drain valves and suitable devices should be fitted for the correct removal of air from the
circuit during the filling stage.
•• A filter must be installed in the water circuit of the heat pump, in order to avoid
obstructions or narrowing caused by dirt in the installation. The filter MUST be installed prior
to filling the installation and on the return branch of the machine with water, to avoid the
entry of dirty water into the heat exchanger (condenser). It is recommended to insert
this filter between two cut-off valves, in order to be able to clean it without
emptying the installation. The type of filter installed must be adapted to the particular
characteristics of each installation (type and material of the water pipes, type of water used,
volume of water in the installation, etc.). The water filter should be checked and cleaned, if
necessary, at least once a year, although in new installations it is recommended to check it
in the first months after commissioning.
The FUSION COMBI hydraulic module is an accessory that should be installed in combination with a
DUAL CLIMA R and an existing boiler heat pump for its correct operation. Therefore, in addition to
the recommendations described above, it must comply with those indicated in the heat pump
installation manual.
ATTENTION: The DUAL CLIMA R heat pump incorporates a 2-liter expansion tank as
standard. Due to the total amount of water in the heating / air conditioning
installation, if necessary, this capacity should be increased by installing
another supplementary expansion vessel.
ATTENTION: A pipe with a diameter suitable for the installation must be used so that the
minimum flow is reached in the hydraulic circuit.
ATTENTION: Before connecting the heat pump, a thorough internal cleaning of the pipes
of the hydraulic installation must be carried out.

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FUSION COMBI W 50/FUSION COMBI F 80
Hydraulic diagram of two circuits, one for cooling and the other for heating.
Hydraulic diagram of two circuits, one for underfloor heating / cooling (with thermostatic mixing
valve max. 45ºC) and the other with radiators.
ATTENTION: The flow and return outlets of the DUAL CLIMA R heat pump and the boiler
must be hydraulically connected to the FUSION COMBI module in the
corresponding outlets indicated on the module (see diagram).
ATTENTION: For the installation of an underfloor heating circuit, it is essential to install a
temperature limiter or a mixing valve at a temperature ≤45ºC at the inlet
of the circuit

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FUSION COMBI W 50/FUSION COMBI F 80
3.3 Drainage the tank
To drain the tank of the FUSION COMBI W 50 module, it is recommended to install a shut-off valve
in the socket (5) at the bottom of the tank. The FUSION COMBI F 80 model has a drain cock at the
bottom. It is recommended to connect a flexible hose to the drain cock and lead it to a drain.
3.4 Assembly and connection of the control panel
The control panel is supplied inside the heat pump and must be mounted on the front of the FUSION
COMBI. hydraulic module. To do this, open the module door and access the remote control support
located on its back. For its correct assembly, carefully follow the following steps:
1. Open the front cover of the FUSION COMBI module, using a flat screwdriver to make a slight
lever.
2. Rest the front cover of the FUSION COMBI module on a table or flat surface that is not rough so
that it does not scratch the paint.
3. Attach the control panel, extracted from the DUAL CLIMA R heat pump, at the rear of the front in
the hole of the control-holder bracket and press lightly.

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FUSION COMBI W 50/FUSION COMBI F 80
4. Tighten the four screws finger-tight until the control panel is fixed. It is not necessary to use a
wrench, it is sufficient to adjust by hand.
5. Insert the connector that incorporates the cable at its end with the connector on the back of the
control panel. A sufficiently long cable length must be provided inside the module, in such a way
that it is possible to open the front of the equipment without having to disconnect said cable and
facilitate any maintenance operation inside.
6. Before starting the heat pump, the control panel must be connected to the external machine. To do
this, pass the cable supplied inside the heat pump (located together with the probe harness) to the
inside of the FUSION COMBI module, follow the instructions in the DUAL CLIMA R heat pump

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FUSION COMBI W 50/FUSION COMBI F 80
instruction manual A. The hydraulic module and the heat pump have a series of cable glands,
through one of which said cable can be inserted into the equipment
The cable supplied with the heat pump is 5 metres long. Where necessary, it can be extended up to a
maximum distance of 100 metres (section between 0.5÷1.25 mm2).
DANGER: While working on the system Be sure to disconnect both the module and
the heat pump from the electrical supply. To do this, you can disconnect
the supply from the main network checking that boththe FUSION COMBI
hydraulic module and the heat pump are completely disconnected.
ATTENTION: Provide enough length of cable inside the module in order to facilitate the
opening of the front cover.

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FUSION COMBI W 50/FUSION COMBI F 80
3.5 Electrical connection
In order to manage the operation of the water circulation pumps of the Heating/Cooling system by
means of thermostats or programmable thermostats installed in the home, the FUSION COMBI all-
in-one hydraulic module should be connected to the general electricity supply network, for which
purpose a terminal strip is available. In turn, all the electrical components of the installation (circulation
pumps, thermostat, and DUAL CLIMA R heat pump) should also be connected to this strip.
The hydraulic installation of the FUSION COMBI module should be carried out by qualified personnel,
in compliance with the current installation regulations on the matter. The electrical installation should
be connected in a way that facilitates the complete insulation and disconnection of the module to carry
out maintenance operations in a safe manner.
The FUSION COMBI hydraulic module is prepared for connection to 230 V ~ 50 Hz in terminals 1, 2
and ground of the terminal strip (see “ Electrical diagram ”). The power supply terminals are located
inside the machine, by opening its front door.
The hydraulic module has a series of cable ducts in its roof, through which the cables can be inserted
inside the equipment. Cables exposed to external weather conditions should be protected by chutes or
protective pipes or should be of a suitable category for use outdoors (H07RN-F hoses or higher). In
turn, it is advisable to keep the high-voltage cables at a minimum distance of 25 mm (general supply,
diverter valves, support resistors, circulation pumps, etc.) from the low-voltage cables (control panel
cable, temperature probes, room probes, etc.), driving them through independent pipes.
It is essential to also connect the DUAL CLIMA R heat pump to the electrical supply as indicated in
the “Connection to the general electrical supply” section of the DUAL CLIMA R heat pump manual.
DANGER: Whenever working on the electrical installation, make sure that both the
module and the DUAL CLIMA R heat pump are disconnected from the
mains.
3.5.1 Connecting the circulation pumps of the installation (BC, BF)
The FUSION TRIO hydraulic module can manage the operation of up to 2 circulating pumps installed
in the heating and cooling circuits of the Heating and Cooling system, respectively. To do so, these
pumps should be electrically connected to the terminal strip located inside the module. The activation
and deactivation of the pumps will be carried out through the signals received from the thermostats
connected to the module strip.
The circulation pump of the Heating circuit BC must be connected to terminals 3-4 of the module
terminal strip and the circulation pump of the Cooling circuit BF must be connected to terminals 5-6
(see "Electrical Diagram"). In case of installing the same pump for the two heating and cooling hydraulic
circuits, one of the pump cables must be connected to terminal 3and the other must be connected to
2 terminals 4 and 6, adding an electrical bridge between them. Do not forget to connect the ground
cable of the pumps to the ground terminal of the terminal block. The hydraulic module has a series of
cable glands, through which the pump cables can be inserted into the equipment.
3.5.2 Connecting the module with the DUAL CLIMA R heat pump and the boiler
The FUSION COMBI module integrates signals from room thermostats and activation of heating
support, through the boiler, which must be sensed by the DUAL CLIMA R heat pump. For this,
electrical cables with a minimum section of 0.5 must be passed mm2 from the DUAL CLIMA R heat
pump terminal strip to the inside of the FUSION COMBI module. The following figures describe how
to connect all the signals necessary for correct operation.

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FUSION COMBI W 50/FUSION COMBI F 80
First of all, it is necessary to remove the jumpers in the room thermostat connection of the DUAL
CLIMA R heat pump.
Once the bridges have been removed, all the connections specified below must be made:
Route a three-wire electrical hose from terminal H, Cand COM of the DUAL CLIMA R heat pump
terminal strip to terminals 12, 13 and 14 of the terminal strip inside the FUSION COMBI module ( see
" Connection diagram "). The module has a series of cable glands, through which said cables can be
inserted into the equipment.
Subsequently, connect with two cables the E2L and Nconnection terminals of the DUAL CLIMA R
heat pump terminal strip with terminals 15 and 16 of the terminal strip inside the FUSION COMBI
module (see " Wiring diagram ").
Finally, interconnect the input terminals of the existing boiler room thermostat with the connection
terminals No. 10 and 11 (TAcald) of the FUSION COMBI module terminal strip (see "Connection
diagram"). In this way, the DUAL CLIMA R heat pump will be able to activate the heating service
demand of the boiler in backup or auxiliary mode.
The following connection diagram describes how to make the necessary connections for correct
operation between the DUAL CLIMA R heat pump, the FUSION COMBI Module and the boiler.

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FUSION COMBI W 50/FUSION COMBI F 80
DANGER: Whenever working on the electrical installation, make sure that both the
module and the DUAL CLIMA R heat pump are disconnected from the
mains.
3.5.3 Instruction on electrical connection to a boiler with minimum boiler
temperature maintenance
If you have a boiler with minimum temperature maintenance and you only want it to be on when the
heat pump needs it as support or auxiliary, the electrical connections must be made as follows:

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FUSION COMBI W 50/FUSION COMBI F 80
3.6 Connecting room thermostats
The FUSION COMBI hydraulic module incorporates two connections on the terminal strip prepared
for the installation of up to 2 room chronothermostats or room thermostats (see "Electrical Diagram"),
which will allow managing up to 2 water circulation pumps to activate or stop the heating (BC) and /
or cooling (BF) service of the heating / air conditioning installation, turning them off when the desired
temperature is reached in the home and turning them on when it descends again. Through input 5-6
the Cooling pump BF will be activated and deactivated in the Cooling mode, and through input 3-4 the
heating pump BC will be activated and deactivated.
Terminals 7, 8and 9are supplied from the factory with a jumper connected to each one of them, so,
whatever the thermostat configuration to be installed, it will be necessary to remove the two jumpers
before connecting the room thermostat.
Depending on the type of thermostat used or the combination of these, up to 3 types of different room
thermostat configurations can be installed. The following sections describe in detail the operation and
installation of each of these configurations.
In turn, through terminals 12, 13 and 14 of the terminal strip, the thermostat signals can be connected
to the DUAL CLIMA R outdoor unit. In this way, the operating modes of the the heat pump, from the
place where the installed room thermostats are located. Through terminals 12-13 the Cooling mode
will be activated and deactivated, and through input 12-14 the Heating mode will be activated and
deactivated.
3.6.1 Connecting a 3-wired switched room thermostat for Heating/Cooling
In addition to selecting the desired temperature and periods of operation, this type of thermostat, if it
is of the programmable thermostat type, offers users the possibility of selecting the mode of operation
in the thermostat itself (Heating /Cooling ).
For its operation, this type of thermostat has 3 communication wires: one for the activation signal of
the Heating mode, one for the activation signal of the Cooling mode, and one for the common signal.
Depending on the status of each signal, the FUSION COMBI module will manage the activation of
each circulation pump (BC or BF), corresponding to each Heating or Cooling mode, as follows:
Terminals 7, 8 and 9 are supplied from the factory with a jumper wire connected to each of them, so
in order to install this type of thermostat, it will be necessary to remove both jumper wires and connect
the thermostat as described in the following figure:

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FUSION COMBI W 50/FUSION COMBI F 80
DANGER: Whenever working on the electrical installation, make sure that both the
module and the DUAL CLIMA R heat pump are disconnected from the
mains.

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FUSION COMBI W 50/FUSION COMBI F 80
3.6.2 Connecting two room thermostats (one for heating and the other for cooling)
In this type of configuration, two single room thermostats will be connected, one in terminals 7 and 9
(CRT Cooling thermostat) and one in terminals 7and 8(HRT Heating thermostat). Each of them
manages the operation of a different circulation pump (BC for Heating and BF Cooling). Therefore,
each thermostat should be of the type compatible with the operation for which it was installed. The
thermostat connected to the cooling input (CRT) should demand (closed circuit signal) when the room
temperature is higher than the desired temperature (setpoint temperature), and in turn, the thermostat
connected to the heating input (HRT) should demand (closed circuit signal) when the room
temperature is lower than the desired temperature (setpoint temperature).
The FUSION COMBI module will manage the activation of each circulation pump (BC or BF),
corresponding to each Heating or Cooling mode, as follows:
As indicated in the figure, in case of selecting the setpoint temperatures of the room thermostats in
such a way that both demand operation simultaneously, the control of the hydraulic module will start
operation in the “Manual” mode, that is, both circulation pumps will be activated simultaneously. To
avoid this situation, it is essential to make sure to correctly select the temperatures of each of
them, in such a way that they do not cross and to avoid that both thermostats are activated
at the same time.
Terminals 7, 8and 9are supplied from the factory with a jumper wire connected to each of them, so
in order to install the thermostats, it will be necessary to remove both jumper wires and connect the
thermostats as described in the following figure:
DANGER: Whenever working on the electrical installation, make sure that both the
module and the DUAL CLIMA R heat pump are disconnected from the
mains.