COSMOGAS ECOTWIN User manual

62403833 - R03 12-04-2021_UK
INSTALLATION, USE AND MAINTENANCE MANUAL
ECOTWIN
HEAT PUMP

1 - GENERAL SAFETY WARNINGS..............................................................................4
1.1 - National installation laws........................................................................................................... 4
2 - GENERAL INFORMATIONS.....................................................................................5
2.1 - Overview of the models ............................................................................................................ 5
2.2 - Accessories............................................................................................................................... 5
2.3 - Distributor ................................................................................................................................. 6
2.4 - Key to symbols used................................................................................................................. 6
2.5 - Maintenance ............................................................................................................................. 6
2.6 - Disposal .................................................................................................................................... 6
3 - HYDRAULIC CONNECTIONS..................................................................................7
4 - MAIN COMPONENTS...............................................................................................9
5 - OPERATION ...........................................................................................................12
5.1 - Intended use and function....................................................................................................... 12
5.2 - Available head to the heating / cooling system ....................................................................... 13
5.3 - Ecotwin with one heating/cooling circuit and DHW................................................................. 16
5.3.1- Conguration for one heating/cooling circuit and DHW .............................................................17
5.4 - Ecotwin with one heating/cooling circuit, DHW and a bu󰀨er tank........................................... 18
5.4.1- Conguration for one heating/cooling circuit, DHW and a bu󰀨er tank........................................19
5.5 - Ecotwin with one heating/cooling circuit, DHW, a bu󰀨er tank and a boiler ............................. 20
5.5.1 - Conguration for one heating/cooling circuit, DHW, a bu󰀨er tank and a boiler .........................21
5.6 - Ecotwin with double heating/cooling circuit, DHW, a bu󰀨er tank and a boiler......................... 22
5.6.1 - Conguration for double heating/cooling circuit, DHW, a bu󰀨er tank and a boiler ....................23
6 - INSTALLATION .......................................................................................................25
6.1 - Opening the package.............................................................................................................. 25
6.2 - GS indoor unit dimensions...................................................................................................... 25
6.3 - Minimum clearance distances of GS indoor unit..................................................................... 25
6.4 - Minimum clearance distances of STM outdoor unit ................................................................ 26
6.6 - Warnings before installation.................................................................................................... 28
6.7 - Choosing the installation location of GS indoor unit ............................................................... 28
6.8 - Choosing the installation location of STM outdoor unit........................................................... 28
6.8.1 - Mounting the appliance .............................................................................................................29
6.8.2 - STM outdoor unit condensate drain installation ........................................................................29
6.8.3 - Installation in cold and snowy areas .........................................................................................30
6.9 - Heating/Cooling supply and return.......................................................................................... 30
6.10 - Radiant panel systems (or low temperature) ........................................................................ 31
6.11 - Domestic hot and cold water ................................................................................................. 31
6.12 - Antilegionella......................................................................................................................... 31
6.13 - Distances between indoor and outdoor unit.......................................................................... 32
6.14 - Wall mounting of the GS indoor unit ..................................................................................... 33
6.15 - Installation of the safety kit in the GS indoor unit.................................................................. 34
6.16 - Refrigerant connections ........................................................................................................ 35
6.16.1 - Connections for the refrigerant gas circuit...............................................................................36
6.16.2 - Checking the tightness of the refrigerant circuit ......................................................................38
6.16.3 - Evacuation of the air from the refrigerant circuit and release the refrigerant ..........................38
6.16.4 - Refrigerant addition according to the length of the refrigerant circuit......................................39
6.17 - Electrical connections: general information .......................................................................... 39
6.17.1 - Electrical supply connection of GS indoor unit ........................................................................42
6.17.2 - Electrical supply connection of STM outdoor unit ...................................................................42
7 - START UP...............................................................................................................45
7.1 - Before starting......................................................................................................................... 45
7.1.1 - User instructions........................................................................................................................45
7.1.2 - Filling the heating / cooling circuit .............................................................................................45
7.2 - Emergency operation ............................................................................................................. 45
7.3 - Start up ................................................................................................................................... 46
CONTENTS

3ecotwin
COSMOGAS
CONTENTS
7.4 - Choosing the heating / cooling mode...................................................................................... 46
8 - USE.........................................................................................................................47
8.1 - Display .................................................................................................................................... 47
8.2 - Settings ................................................................................................................................... 49
8.2.1 - ZONE 1 ....................................................................................................................................50
8.2.2 - ZONE 2 ....................................................................................................................................52
8.2.3 - DHW .........................................................................................................................................55
8.2.4 - DHW storage.............................................................................................................................56
8.2.5 - NIGHT ......................................................................................................................................57
8.2.6 - LEGIONELLA ............................................................................................................................57
8.2.7 - VACATION.................................................................................................................................58
8.2.8 - USER ........................................................................................................................................59
8.2.9 - WORKING MODE .....................................................................................................................60
8.2.10 - BACK-UP ................................................................................................................................61
8.2.11 - WATER PUMPS ......................................................................................................................62
8.2.12 - ELECTRIC LOCK....................................................................................................................63
8.2.13 - OTHER OPTIONS...................................................................................................................64
8.2.14 - REAL TIME DATA....................................................................................................................66
8.2.15 - Info ..........................................................................................................................................67
8.2.16 - Home page..............................................................................................................................67
9 - DIAGNOSTICS........................................................................................................68
10 - MAINTENANCE ....................................................................................................72
10.1 - General warnings.................................................................................................................. 72
10.2 - Maintenance protocol............................................................................................................ 72
10.3 - Check the water pressure in the system and there are no leaks .......................................... 73
10.4 - Check the good condition of the safety valve ....................................................................... 73
10.5 - Check and clean the safety exhaust valve system ............................................................... 73
10.6 - Check the good condition of the safety and control devicees............................................... 73
10.7 - Check the good conditions of the electrical system .............................................................. 73
10.8 - Check the operation of the main switch ................................................................................ 73
10.9 - Check the temperature adjustment in heating and DHW...................................................... 73
10.10 - Check the good conditions and operation of the vent valves present................................. 73
10.12 - Check that the evapocondensing battery is clean .............................................................. 73
10.13 - Check there are no leaks in the refrigerant circuit .............................................................. 73
10.14 - Check the good conditions of the electrical connections .................................................... 73
10.15 - Check the status of the fan ................................................................................................. 73
10.16 - Check the control devices................................................................................................... 73
10.17 - Check the operating pressures of the refrigerant circuit ..................................................... 74
10.18 - Refrigerant circuit repairs.................................................................................................... 74
10.19 - Filling the refrigerant circuit................................................................................................. 74
10.20 - Replace the pump............................................................................................................... 74
10.21 - Cleaning the lter ................................................................................................................ 74
10.22 - Refrigerant accumulation in outdoor unit ............................................................................ 74
10.23 - Draining the heating circuit ................................................................................................. 74
10.24 - Remove the casing and access to the internal components of the GS unit........................ 75
10.25 - Remove the casing and access to the internal components of the STM ............................ 75
10.26 - Wiring diagram.................................................................................................................... 76
11 - TECHNICAL DATA................................................................................................. 80
12 -EU CONFORMITY DECLARATION....................................................................... 82
13 - PRODUCT FICHE.................................................................................................83

4COSMOGAS
Ecotwin
1 - GENERAL SAFETY WARNINGS
Installation, changes
The gas appliance must be installed, calibrated or modied
by qualied installer, in compliance with national and local
regulations, as well as the instructions in this manual.
Incorrect installation or poor maintenance can cause
damage or injury to persons, animals or objects, for which
the manufacturer cannot be deemed liable.
A water temperature higher than 51°C can also cause
permanent damage to people, animals and objects. Above
all, children, the older people and people with disabilities
must be protected against potential risks of scalds, by
inserting devices that limit the temperature of the DHW.
It is forbidden to leave any parts of the packaging or any
replaced parts within the reach of children.
Before performing any cleaning or maintenance operations,
disconnect the appliance from the power supply, water and
gas supply, using the appropriate devices.
After having performed any cleaning or maintenance
operations, make sure that all internal parts of the appliance
are dry before reconnecting the electric power supply.
This appliance is not intended for use by persons (including
children) with reduced physical, sensory and mental
capabilities or a lack of experience or knowledge, unless
they are supervised or have been instructed on use of the
appliance by a person responsible for their safety.
This manual is an integral and essential part of the
product and must be kept carefully by the user for future
consultation. If the appliance needs to be transferred or if
you should move and leave the unit to another user, always
ensure that this manual remains with the new user and/or
installer.
Any options or kits added later must be original Cosmogas
products.
This appliance must be intended only for the use for which it
has been expressly declared: central heating/cooling water
for closed circuits intended for central heating/cooling of
rooms for civil and domestic use, production of domestic
hot water for civil use.
Any contractual and non-contractual liability on the part
of the manufacturer is excluded for damage caused by
installation errors or usage errors and, in all cases, following
a failure to comply with the instructions given by the
manufacturer or with applicable national and/or local laws.
For safety reasons and to safeguard the environment, the
packaging components must be disposed of in the relevant
separate waste collection centres.
R410A refrigerant
This appliance contains uorinated greenhouse gases
covered by the Kyoto Protocol: the installation must
be carried out by an installer / company authorized in
accordance with the European regulation EU 517/2014.
Vapors are heavier than air and can cause asphyxiation by
reducing the amount of oxygen.
Liqueed gas: contact with liquid can cause frostbite and
serious eye damage.
Product classication: this product is not classied as
a “dangerous preparation” according to the European
Community regulations.
If the R410A refrigerant is mixed with air, it can cause
pressure peaks in the refrigeration pipes and generate an
explosion or other hazards.
Refrigerant and piping:
Use only R410A refrigerant liquid to ll the system.
Use tools and piping components specially designed for
use with R410A refrigerant liquid.
Use phosphorus deoxidized copper pipes for transporting
the refrigerant.
Store the refrigerant connection pipes away from dust and
humidity (risk of damage to the compressor).
Do not use charging cylinders.
Protect the components of the heat pump, including
insulation and structural elements. Do not overheat the
pipes: the brazed elements can cause damage.
Contact of the refrigerant uid with a ame can cause
emanations of toxic gases.
Refrigerant leaks:
1. Shut o󰀨 the appliance.
2. Open windows.
3. Do not use open ames.
4. Avoid any contact with the refrigerant.
5. Identify the probable leak and correct the problem
immediately.
In case of failure
In the event of a fault and / or malfunction of the appliance,
deactivate it, refraining from any attempt to repair. Contact a
professionally qualied technician only. If components need
to be replaced for repairs, they must be original spare parts
only. Failure to comply with this may compromise the safety
of the appliance.
Qualied installer.
A ‘qualied installer’ means a person with specic technical
skill in sector of central heating system components and
production of domestic hot water for sanitary and civil uses,
electric installations, and systems for the use of combustible
gas. Such people must have the skills envisaged by the law.
Technical drawings
All the drawings shown in this manual relating to electrical,
hydraulic or gas installation systems must be understood to
be purely illustrative. All the safety devices, auxiliary devices
and the diameters of the electrical, hydraulic and gas pipes
must always be checked by a qualied installer, to make sure
they satisfy the applicable laws and regulations.
1.1 - National installation laws
Respect the national regulations, provisions, directives and
laws in force.

5ecotwin
COSMOGAS
2 - GENERAL INFORMATIONS
2.1 - Overview of the models
2.2 - Accessories
The appliance is supplied with the following accessories:
GS UNIT
Quantity N°. Description Figure
N°. 1 ROOM TEMPERATURE TR
N°. 1 DHW TEMPERATURE SENSOR TW
N°. 1 HEATING/COOLING TEMPERATURE SENSOR TC
N°. 1 TV1 SENSOR HEATING/COOLING CIRCUIT
N°. 1 TV2 SENSOR HEATING/COOLING CIRCUIT
N°. 5 SENSOR EXTENSION CABLES
N°. 1 SAFETY KIT
GS/STM XX
6 = Heat pump with modulating heat output between 1,98 and 6,2 kW
9 = Heat pump with modulating heat output between 4,33 and 10,1 kW
13 = Heat pump with modulating heat output between 4,2 and 12,6 kW
STM:Heat pump for outdoor installation, central heating/cooling and
DHW production.
GS:Hydronic module for indoor installation, central heating/cooling and
DHW production with bu󰀨er tank .
STM UNIT
Quantity N°. Description Figure
N°. 1 CONDENSATE DRAIN CONNECTION

6COSMOGAS
Ecotwin
2 - GENERAL INFORMATIONS
2.3 - Distributor
COSMOGAS srl
Via L. da Vinci 16
47014 - Meldola (FC) Italia
Tel. [phone]
Fax. [phone]
www.cosmogas.com
[email protected]
2.4 - Key to symbols used
WARNING!!!
Electric shock hazard Failure to comply with these warnings
may compromise the working order of the appliance or cause
serious damage or injury to persons, animals or objects.
WARNING!!!
Failure to comply with these warnings may compromise the
working order of the appliance or cause serious damage or
injury to persons, animals or objects.
PROHIBITION !!!
Generic hazard. Failure to comply with these warnings may
compromise the working order of the appliance or cause
serious damage or injury to persons, animals or objects.
Important indication symbol.
N/A : Not applicable.
2.5 - Maintenance
A regular annual maintenance check on the appliance is
advised for the following reasons:
- to maintain high e󰀩ciency and manage the central heating
system economically (with low fuel consumption);
- to achieve a high level of safety operation.
2.6 - Disposal
The crossed wheelie bin symbol means that the product
must not be thrown away in the ordinary rubbish bin (i.e. in
with “mixed urban rubbish”); it must be dealt with separately,
in order to undergo suitable operations for it to be reused
or threated, so that any substances that are dangerous for
the environment can be removed and safely disposed. This
will enable all the raw materials to be recycled. The user is
responsible for getting rid of the boiler at the end of its life,
delivering it to a recycling centre run by the local authority
or city hygiene companies, or, when he/she buys a new
appliance, giving the product that has been replaced to
the dealer, who is obliged to take it under the terms of EU
Directive 2012/19/EU. For further information regarding correct
decommissioning of these units, users can contact the public
service in charge or retailers.

7ecotwin
COSMOGAS
3 - HYDRAULIC CONNECTIONS
Figure 3-1 - Main components and connection diameters of the GS unit
Refrigerant connections
(gas line)
GS 06/09: ½”
GS 13: 5/8”
Refrigerant connections
(liquid line)
GS 06: 1/4”
GS 09: 3/8”
GS 13: 3/8”
Safety valve kit
Cable glands
Control panel
Heating / cooling
water outlet : 1”
Water inlet : 1”
Water outlet to
DHW tank: 1”
Electrical resistance
Digital thermostat (*)
Pump
Door
Electrical compartment
Electrical terminals
(*) Digital thermostat = DHW emergency thermostat: if it is enabled, at a certain setpoint (max 75 ° C), it activates the internal
pump and heats the domestic water to the setpoint. To use this thermostat refer to section 7.2.
WARNING !!! The digital thermostat can only be activated if there is a domestic hot water tank (Figure from
5-4 to 5-10).

8COSMOGAS
Ecotwin
3 - HYDRAULIC CONNECTIONS
Figure 3-3 - Main components and connection diameters of the STM13 unit
Figure 3-2 - Main components and connection diameters of the STM06 - STM09 unit
Electrical
connections cover
Refrigerant connection
(liquid line)
STM 06:1/4”
STM 09: 3/8”
Refrigerant connection
(gas line) : 1/2”
Valve cover
Valve cover
Refrigerant connection
(gas line) : 5/8”
Refrigerant
connection
(liquid line): 3/8”
Electrical
connections
cover
Air
Inlet
Air
Inlet
Air
Outlet
Air
Outlet

9ecotwin
COSMOGAS
Electrical
connections cover
Electrical
connections
cover
4 - MAIN COMPONENTS
Figure 4-1 - GS unit internal components
1 - Control panel
2 - Door
3 - Cover of electrical compartment
4 - Electrical compartment
5 - Fuse box
6 - 3-way valve
7 - Pump
8 - Electric heater
9 - Refrigerant expansion tank (STM 06/09)
10 - Casing
11 - Box connections
12 - Liquid line connection
13 - Safety kit
14 - Gas line connection
15 - Wall brachet
16 - Water ow switch
17 - Water connection
18 - T valve
19 - Plate heat exchanger bracket
20 - Water connection
21 - Template connections
22 - Cable glands connection
23 - Plate heat exchanger brachet
24 - Liquid line temperature sensor (TUP)
25 - Plate heat exchanger
26 - Supply temperature sensor (TUO)
27 - DHW temperature sensor (Tw)
28 - Circuit 1 temperature sensor (TV1)
29 - Circuit 2 temperature sensor (TV2)
30 - Heating/Cooling temperature sensor (Tc)
31 - Temperature sensor (Tr)
32 - High limit safety thermostat
33 - DHW safety thermostat (max 75°C)
35 - Return temperature sensor (TUI)
36 - Control board

10 COSMOGAS
Ecotwin
4 - MAIN COMPONENTS
26
27
28
8
9
5
6
7
1
23
4
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
29
34
Figure 4-2 - STM 06 and STM 09 unit internal components
1 - Fan grid
2 - Outdoor fan
3 - Fan motor
4 - Front panel
5 - Air direction
6 - Brachet
7 - Motor support
8 - Angle
9 - 4-way valve
10 - Electrical box
11 - Electrical box cover
12 - Upper cover
13 - Bottom cover
14 - Evapo-condensing battery
15 - Partition
16 - Right panel
17 - Floor heater wire
18 - Junction box cover
19 - Partition
20 - Refrigerant connection
21 - Refrigerant connection
22 - Connection cover
23 - Compressor
24 - Foot
25 - Lower panel
26 - Expansion valve coil
27 - Electronic expansion valve (EEV)
28 - Compressor heater
29 - Outdoor temperature sensor
34 - Evapo-condensing battery temperature sensor

11 ecotwin
COSMOGAS
1
2
3
46
7
8
9
10
5
12
13
14
15
18
11
16
17
19
20 21 22
23 24
34
29
30
32
31
33
25
26
27
28
Figure 4-3 - STM 13 unit internal components
1 - Fan grid
2 - Front panel
3 - Air direction
4 - Outdoor fan
5 - Fan motor
6 - Brachet
7 - Motor support
8 - Angle
9 - Controller
10 - Upper cover
11 - Outdoor temperature sensor
12 - Evapo-condensing battery
13 - Partition
14 - Junction box cover
15 - Liquid separator
16 - Suction temperature sensor
17 - Compressor discharge temperature sensor
18 - Compressor
19 - Lower panel
20 - Valve plate
21 - Refrigerant connection
22 - Refrigerant connection
23 - Side cover
24 - Refrigerant connection cover
25 - Block connector
26 - Inductance
27 - Transformer
28 - Expansion valve controller
29 - Electronic expansion valve (EEV)
30 - Compressor heater
31 - Floor heater wire
32 - 4-way valve
33 - Expansion valve temperature sensor
34 - Evapo-condensing battery temperature sensor
4 - MAIN COMPONENTS

12 COSMOGAS
Ecotwin
5 - OPERATION
5.1 - Intended use and function
This product is a split heat pump, consisting of:
-STM: a reversible refrigerating outdoor unit, with inverter
controller, to be combined with the indoor unit by means of
refrigerant and electrical connections;
-GS: Hydronic module for indoor installation, central heating/
cooling and DHW production with tank.
Perform the adaptation between appliance and system
considering the available head values in Figure 5-1.
Temperature adjustments for heating, cooling and domestic
hot water are carried out by following the appropriate
procedures described in sections 8.2.1,8.2.2 and 8.2.3. The
appliances can be connected to a room thermostat for heating
regulation. Or, to rene the quality of the heating service, it is
possible to use an outdoor temperature sensor (outdoor reset)
to automatically adjust the supply temperature according to
the outdoor temperature (already present on the STM unit).
The air conditioner has a compressor that modulates the
speed according to the heat output. However, the maximum
speed is only guaranteed for an outdoor temperature below
14 ° C in heating and between 28 ° C and 41 ° C in cooling.
This appliance must be connected to a heating / cooling
system and to a domestic hot water net system, compatibly
with the characteristics, performance and power of the
appliance itself.
Before installation, it is necessary to thoroughly wash
the hydronic system, in order to remove any residues or
impurities that could compromise the proper functioning
of the appliance.
This appliance can be installed indoor.
This appliance must be installed in a place such that any
water leaks coming from it, from the connections between
the pipes or from the safety valve drain, cannot cause
damage to underlying materials or things.
Check in Figures 6-2 and 6-3 the minimum distances of
installation and future maintenance.
WARNING !!! Do not subject the indoor unit to
temperatures below 0.5 ° C and above 50 ° C.
It can be exposed to temperatures as low as -10 ° C (10
° C below zero) if the heating circuit is protected with
suitable antifreeze and electrically powered in such a way
as to allow the electric heater to intervene (detail “8” in
Figure 4-1). These protections only cover the device and
not the system.

13 ecotwin
COSMOGAS
Figure 5-1 - Water ow and available head of the heating/cooling system
5.2 - Available head to the heating /
cooling system
The head available at the appliance connections is shown in
the table in Figure 5-1.
When sizing the system, the installer must take into account
these available head values to run the correct water ow.
Model
Minimum
water ow Available head
l/h kPa
6 1044 61
9 1548 63
13 2196 53
5 - OPERATION

14 COSMOGAS
Ecotwin
5 - OPERATION
330034_a
LEGEND of Figure 5-2:
1 - Fan
2 - Evapo-condensing battery
3 - Compressor
4 - 4-way valve
5 - Filter
6 - Expansion valve
7 - Outdoor connections of outdoor unit
8 - Outdoor connections of indoor unit
9 - Water pump
10 - Plate heat exchanger
11 - Outdoor temperature sensor
12 - Evapo-condensing battery temperature sensor
13 - High pressure switch
14 - Compressor discharge temperature sensor
15 - High pressure sensor
16 - Low pressure sensor
17 - Suction temperature sensor
18 - Refrigerant temperature sensor (TUP)
19 - Tc sensor (if there is a tank, connect it to the tank)
20 - Supply temperature sensor (TUO)
21 - Return temperature sensor (TUI)
22 - Heating system
23 - Liquid separator
24 - Liquid receiver
Figure 5-2 - Functional schematics

15 ecotwin
COSMOGAS
5 - OPERATION
LEGEND of Figure 5-3:
1 - Main electrical supply
10 - Outdoor unit
13 - Modbus communication
40 - Electrical supply for outdoor unit
44 - Safety kit (hydrometer, safety valve and automatic air vent
valve) (supplied with accessories)
45 - Heating supply
46 - Return
47 - DHW supply
48 - 3-way diverter valve DHW/cooling-heating
49 - GS unit pump
50 - Electrical resistance 230 V/50 HZ P = 3 kW
51 - Plate heat exchanger
52 - Refrigerant gas line
53 - Indoor unit
Figure 5-3 - Hydraulic diagram

16 COSMOGAS
Ecotwin
Figure 5-4 - Hydraulic diagram with one heating/cooling circuit and DHW
LEGEND of Figure 5-4 and 5-5:
1 - Main electrical supply
2 - Internal electrical resistance (3 kW)
3 - Electrical supply (Max 10A)
9 - DHW electrical resistance
10 - Outdoor unit
13 - Modbus communication
17 - Cooling demand
18 - Heating demand
20 - Circuit 1 sensor (TV1)
22 - Room temperature sensor (Tr)
23 - Heating/Cooling thermoregulation sensor (Tc)
24 - DHW temperature sensor (Tw)
27 - Filter
28 - Di󰀨erential by-pass valve
29 - Solar (optional)
30 - Domestic cold water
31 - Heating/Cooling system
32 - Bu󰀨er tank
33 - Auxiliary heat exchanger for solar or other
40 - Outdoor power supply
43 - Drain valve
53 - Indoor unit
5.3 - Ecotwin with one heating/cooling circuit and DHW
5 - OPERATION

17 ecotwin
COSMOGAS
5 - OPERATION
Figure 5-5 - Wiring diagram with one heating/cooling circuit and DHW
5.3.1- Configuration for one heating/cooling
circuit and DHW
After creating the hydraulic system as shown in Figure 5-4 and the electrical
system as shown in Figure 5-5, congure the appliance as follows:
WARNING !!! The unit can operate without a tank on the heating/
cooling side if the amount of water circulating in the circuit is at least
equal to 10 l / kW of unit power.
For example, in the case of the Ecotwin 09 unit (heat output 10 kW), the
amount of water circulating in the system must be at least 10 l / kW = 100
liters.
1.- In the home page of the display, press the “Setting” icon ( detail “H” of
Figure 8-1);
2.- Enter the “USER” menù (section 8.2.8) and select “Permission level”;
3.- Enter the password “87654321” for the Installer level and press OK;
4.- Go back and enter the “WORKING MODE” menù (section 8.2.9);
5.- Using the green tick, enable the unit to produce domestic hot water,
heating and/or cooling;
6.- Go to second page of the menù and set “Heating / Cooling switch” to
“External signal control”. Switching takes place only via remote command
“17” for cooling or “18” for heating;
7.- Exit the “WORKING MODE” menù and press to the “WATER PUMPS”
icon;
8.- To congure the pump outputs so that the circuits work according to the
status of inputs “17” and “18”, it is necessary:
a.- Select “Working mode of circulation pump P0” and set it to “ON
Costantly”;
b.- Go to the next page and remove the check mark from “Bu󰀨er tank”,
disabling;
c.- Put the check mark in “P1 for heating operation” and, if previously
enabled, also enable “P1 for cooling operation” (pump P1 is not present,
but for ECOTWIN work, it must in any case be enabled);
9.- Exit from “WATER PUMPS” and select “DHW”;
10.- Set the DHW setpoint temperature in “Setpoint DHW” parameter;
11.- Exit this menù and enter to “ZONE 1” menù:
a.- If the cooling function is enabled, select “Set temp. for cooling (x ow
water temperature” and set the setpoint temperature;
b.- If you want to adjust the heating temperature via outdoor reset, tick
“Heating curve (HC1)” and complete the following parameters as
described in section 8.2.1;
c.- If the “Heating curve (HC1)” has not been selected, set the appropriate
set point temperature on the “Set temp. for heating (x ow water
temperature)”;
12.- Exit this menù and select “BACK-UP”;
13.- Tick on “Backup heating sources for sanitary hot water” so that the heat
pump can call resistance “9” if it is unable to bring the domestic hot water
tank to the required temperature within a certain number of minutes;
14.- Select “Priority for backup heating sources (HWTBH)” and set it to
“Lower than AH” (in this way priority is given to resistance “9” and then to
resistance “35” which is inside the heat pump);
15.- In the same way and with the same criterion, you can choose the
integration of alternative heating sources, setting the related parameters.
After this conguration, the unit is able to:
- Domestic hot water production in priority over heating / cooling;
- Be called in heating by closing contact “18”;
- Be called in cooling by closing contact “17”;
- Call the integrative resistance “9” (Figure 5-4) or the internal resistance
“35” (Figure 6-22) whenever the appliance fails to reach the domestic hot
water and / or heating set point within a certain period of time.

18 COSMOGAS
Ecotwin
5 - OPERATION
Figure 5-6 - Hydraulic diagram with one heating/cooling circuit, DHW and a bu󰀨er tank
LEGEND of Figure 5-6 and 5-7:
1 - Main electrical supply
2 - Internal electrical resistance (3 kW)
3 - Electrical supply (Max 10A)
4 - Electrical supply (Max 10A)
6 - Pump P1
9 - DHW electrical resistance
10 - Outdoor unit
11 - Heating electrical resistance
13 - Modbus communication
17 - Cooling demand
18 - Heating demand
20 - Circuit 1 temperature sensor (TV1)
22 - Room temperature sensor (Tr)
23 - Heating/Cooling thermoregulation sensor (Tc)
24 - DHW temperature sensor (Tw)
27 - Filter
29 - Solar (optional)
30 - Domestic cold water
31 - Cooling/heating system
32 - DHW bu󰀨er tank
33 - Auxiliary heat exchanger for solar or other
36 - Heating/cooling Bu󰀨er tank
40 - Outdoor unit power supply
43 - Drain valve
53 - Indoor unit
5.4 - Ecotwin with one heating/cooling circuit, DHW and a bu󰀨er tank

19 ecotwin
COSMOGAS
5 - OPERATION
Figure 5-7 - Wiring diagram with one heating/cooling circuit, DHW and a bu󰀨er tank
5.4.1- Conguration for one heating/cooling
circuit, DHW and a bu󰀨er tank
After creating the hydraulic system as shown in Figure 5-6 and the
electrical system as shown in Figure 5-7, congure the appliance as
follows:
1.- In the home page of the display, press the “Settings” icon ( detail
“H” of Figure 8-1);
2.- Enter the “USER” menù (section 8.2.8) and select “Permission level”;
3.- Enter the password “87654321” for the Installer level and press OK;
4.- Go back and enter the “WORKING MODE” menù (section 8.2.9);
5.- Using the green tick, enable the unit to produce domestic hot water,
heating and/or cooling;
6.- Go to second page of the menù and set “Heating / cooling switch”
to “External signal control”. Switching takes place only via remote
command “17” for cooling or “18” for heating;
7.- Exit the “WORKING MODE” menù and press to the “WATER
PUMPS” icon;
8.- To congure the pump outputs so that the circuits work according
to the status of inputs “17” and “18”, it is necessary:
a.- Select “Working mode of circulation pump P0” and set it to
“OFF with compr.”;
b.- Go to the next page and put the check mark to “Bu󰀨er tank”,
enabling it;
c.- Put the check mark in “P1 for heating operation”and, if
previously enabled, also enable “P1 for cooling operation”;
9.- Exit from “WATER PUMPS” and select “DHW”;
10.- Set the DHW setpoint temperature in “Setpoint DHW” parameter;
11.- Exit this menù and enter to “ZONE 1” menù:
a.- If the cooling function is enabled, select “Set temp. for cooling
(x ow water temperature)” and set the setpoint temperature;
b.- If you want to adjust the heating temperature via outdoor reset,
tick “Heating (HC1)” and complete the following parameters as
described in section 8.2.1;
c.- If the “Heating (HC1)” has not been selected, set the appropriate
set point temperature on the “Set temp. for heating (x ow water
temperature)”;
12.- Exit this menù and select “BACK-UP”;
13.- Tick on “Backup heating sources for sanitary hot water” so that the
heat pump can call resistance “9” if it is unable to bring the domestic
hot water tank to the required temperature within a certain number
of minutes;
14.- Select “Priority for backup heating sources (HWTBH)” and set it
to “Higher than AH” (in this way, resistance “9” is given precedence
and then resistance “35”, shown in Figure 6-22, which is inside
the heat pump);
15.- In the same way and with the same criterion you can choose
the integration of alternative sources to heating.
After this conguration, the unit is able to:
- Domestic hot water production in priority over heating / cooling;
- Be called in heating by closing contact “18”;
- Be called in cooling by closing contact “17”;
- Call the integrative resistance “9” (Figure 5-4) or the internal resistance
“35” (Figure 6-22) whenever the appliance fails to reach the domestic
hot water and / or heating set point within a certain period of time.

20 COSMOGAS
Ecotwin
5 - OPERATION
Figure 5-8 - Hydraulic diagram with one heating/cooling circuit, DHW, bu󰀨er tank and a boiler
LEGEND of Figure 5-8 e 5-9:
1 - Main electrical supply
2 - Internal electrical resistance (3 kW)
6 - Pump P1
9 - DHW electrical resistance
10 - Outdoor unit
13 - Modbus communication
17 - Cooling demand
18 - Heating demand
20 - Circuit 1 temperature sensor (TV1)
22 - Room temperature sensor (Tr)
23 - Heating/Cooling thermoregulation sensor (Tc)
24 - DHW temperature sensor (Tw)
25 - Jumper
26 - Connect to terminals “TA” of the boiler
27 - Filter
29 - Solar (optional)
30 - Domestic cold water
31 - Heating/Cooling system
32 - DHW bu󰀨er tank
33 - Auxiliary heat exchanger for solar or other
34 - Boiler
36 - Heating/cooling bu󰀨er tank
37 - Boiler sensor for bu󰀨er tank
40 - Electrical supply of outdoor unit
43 - Drain valve
53 - Indoor unit
5.5 - Ecotwin with one heating/cooling circuit, DHW, a bu󰀨er tank and a boiler