CTC Union EcoZenith i555 Pro Series Manual

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Important!
• Read carefully before use, keep for future reference.
• Translation of the original instructions.
162 505 72-1 2020-09-22
Installation and Maintenance Manual
CTC EcoZenith i555 Pro
3x400 V/ 1x230 V/ 3x230V

162 505 72-1 2020-09-22
Installation and Maintenance Manual
CTC EcoZenith i555 Pro

4CTC EcoZenith i555 Pro
Table of Contents
Checklist _______________________________________________________________________ 6
Important to remember! ______________________________________________ 7
Scope of delivery _________________________________________________________ 7
Safety instructions _______________________________________________________ 8
1. Design of CTC EcoZenith i555 Pro ____________________ 9
1.1 Main components ______________________________________________9
2. Function of CTC EcoZenith i555 Pro ________________ 10
2.1 Heating Circuit _________________________________________________11
2.2 DHW ______________________________________________________________12
2.3 Heat pump______________________________________________________13
2.4 Wood boiler_____________________________________________________16
2.5 Additional boiler (pellets, oil, gas, electricity) ________17
2.6 Solar Energy____________________________________________________ 18
2.7 Recharging Bedrock/Ground_____________________________19
2.8 External DHW tank___________________________________________20
2.9 Pool _______________________________________________________________20
2.10 External buffer _________________________________________________21
2.11 Cooling CTC EcoComfort _________________________________23
3. The house heating curve____________________________________ 24
4. DHW______________________________________________________________________ 28
5. Technical data _____________________________________________________ 30
6. Measurements_____________________________________________________ 32
7. Detailed menu descriptions _______________________________ 33
7.1 Start menu ______________________________________________________33
7.2 Installation wizard_____________________________________________34
7.3 Heating/Cooling_______________________________________________ 35
7.4 DHW ______________________________________________________________38
7.5 Ventilation _______________________________________________________39
7.6 Weekly program_______________________________________________39
7.7 Operation data_________________________________________________ 41
Installer ___________________________________________________________________54
7.8 Display____________________________________________________________54
7.9 Settings __________________________________________________________56
7.10 Define _____________________________________________________________81
7.11 Service____________________________________________________________99
8. Parameter list ____________________________________________________ 105
9. Operation and Maintenance ____________________________ 107
10. Troubleshooting/Appropriate measures_________ 109
10.1 Information messages ____________________________________ 111
10.2 Alarm messages ____________________________________________ 112
11. Transportation, unpacking and installation____ 115
11.1 Transportation________________________________________________ 115
11.2 Unpacking_____________________________________________________ 115
11.3 Fitting rear insulation and plastic top cover________ 115
12. Parts list _____________________________________________________________ 117
13. Schematic diagram___________________________________________ 118
14. Pipe installation_________________________________________________ 120
15. Electrical installation_________________________________________ 131
15.1 Positioning of electrical components ________________ 132
15.2 Omnipolar safety switch__________________________________ 133
15.3 Heat pump power supply________________________________ 133
15.4 Communication between the EcoZenith and CTC
EcoAir/CTC EcoPart_______________________________________ 133
15.5 Low voltage 230 V/400 V (High voltage) ___________ 133
Selecting mode setting ___________________________________________ 137
15.6 Sensor (Safety Extra-Low Voltage (SELV)) _________ 144
15.7 Current sensor connection______________________________ 148
15.8 Settings to be carried out by the installation electri-
cian ______________________________________________________________ 149
15.9 Installing a backup power supply _____________________ 149
16. Installation of optional electric heater ____________ 150
17. Installation of additional boiler ________________________ 151
18. Wiring diagram relay card 3x400V __________________ 152
19. Wiring diagram relay card 1x230V __________________ 154
20. Wiring diagram relay card 3x230V __________________ 156
21. Wiring diagram for expansion card_________________ 158
22. Parts list Wiring diagram __________________________________ 159
23. Resistances for sensors___________________________________ 160
24. Installation Communication _____________________________ 161
24.1 Fitting the ethernet cable_________________________________ 162
24.2 CTC Remote - Screen Mirroring_______________________ 163
24.3 MyUplink - App______________________________________________ 163
25. First start____________________________________________________________ 164
25.1 Before first start _____________________________________________ 164
25.2 First start_______________________________________________________ 165
No liability is accepted for any misprints. We reserve the right to make design changes.
For your own reference
Fill in the information below. It may come in useful if anything should happen.
Product: Manufacturing number:
Installer: Name:
Date: Tel. no.:
Electrical installer: Name:
Date: Tel. no.:

5CTC EcoZenith i555 Pro
You have just purchased a CTCEcoZenithi555Pro, with
which we hope you will be very pleased. Read about how
you can take care of your product on the following pages.
One part contains general information and one part has
been written for the installer. Save this manual containing
the installation and maintenance instructions. You will be
able to enjoy the benefits of your EcoZenith for many years,
and this manual provides all the information you will need.
The Complete System
CTC EcoZenith i555 Pro is a complete system able to
meet your home’s heating and hot water requirements. It is
equipped with a unique control system that monitors and
controls your entire heating circuit regardless of how you
choose to tailor it.
CTC EcoZenith i555 Pro has a control
system that:
• monitors all DHW and heating circuit functions;
• monitors and controls your heat pump, solar panels,
additional heat, buffer tank, pool, etc.;
• allows for individual settings;
• indicates desired values, for instance, temperatures
and energy consumption;
• facilitates settings in a simple and structured manner.
Congratulations on buying your new
product!
Your CTC EcoZenith i555 Pro has built-in finned copper
coils which provide plenty of hot water and another finned
copper coil to handle the heat from solar panels. The
product also has a so-called cellar heat feature during the
summer and a floor feature which maximises the primary
flow temperature.
Using the integrated night reduction function, you can set
and change the temperature in the property during a 24-
hour period, day by day, in blocks or as a vacation function.
Service-friendly
Easily accessible electrical components, along with effective
troubleshooting functions in the control program, make the
EcoZenith easy to service. It is supplied with a room sensor
as standard, which is equipped with LED lights that flash in
the event of a fault.
EcoZenith is fully ready for connection to:
Ground source heat pumps:
• CTC EcoPart 400 series
• CTC EcoPart 600M series
Air source heat pumps:
• CTC EcoAir 400 series
• CTCEcoAir510M230V1N~
• CTCEcoAir520M230V1N~
• CTCEcoAir614M and CTCEcoAir622M
EcoZenith can also be connected to solar panels, water
jacketed stoves and any additional boilers.

6CTC EcoZenith i555 Pro
Checklist
The checklist must always be completed by the installation engineer
• If a service is performed, you may be required to provide this document.
• Installation must always be done according to the installation and maintenance instructions.
• Installation must always be carried out in a professional manner.
• Following installation, the unit should be inspected and checked for functionality.
Following installation, the unit must be inspected and functional checks performed
as indicated below:
Pipe installation.
EcoZenith filled, positioned and adjusted in the correct manner according to the instructions.
EcoZenith positioned so that it can be serviced.
Capacity of the charge/radiator pump (depending on type of system) for the flow required.
Open radiator valves and other relevant valves.
Tightness test.
Bleed the system.
Safety valve function test.
Waste pipe connected to floor drain.
Electrical installation
Compressor, direction of rotation (if heat pump installed).
Safety switch.
Correct and taut wiring.
Requisite sensors for selected system.
Outdoor sensor.
Room sensor (optional).
Accessories.
Customer information (adapted to the relevant installation)
Start-up with customer/installer.
Menus/controls for selected system.
Installation and Maintenance Manual handed over to the customer.
Check and filling, heating circuit.
Fine-tuning information, heat curve.
Alarm information.
Mixing valve.
Safety valve function test.
Review warranty terms and conditions with the customer.
Register your Installation Certificate at ctc.se. (ctc-heating.com).
Information on fault reporting procedures.
_________________________________________________ ___________________________________________________
Date/Customer Date/Installer

7CTC EcoZenith i555 Pro
Important to remember!
Check the following points at the time of delivery and installation:
Scope of delivery
Standard delivery
• Multitank CTC EcoZenith i555 Pro
• Additional package with:
– Installation and Maintenance Manual
– Outdoor sensor
– Room sensor
– Safety valve 9 bar (tap water)
– Safety valve 2.5 bar (radiator system)
– Drainage valve
– Adapter between the drainage valve and the connection sleeve
– Sensor, 2 off (primary flow and return)
– 3x Current sensors
– Cover washer for connections, upper and lower tank, 8 off
– Cover washer for solar coil connections, 2 off
– Insulation for connection sleeves that are not used
– Sensor labelling
– Screw 4.2 x 14 graphite grey (x25 + 2 spare)
– Screw 4.2 x 14 zinc grey (x4 + 2 spare)
• Additional package with rear insulation sections and plastic top
!Information in this type
of box [!] is particularly
important for correctly
installing and using the
product.
iInformation in this type
of box [i] is intended
to help ensure that
the product functions
optimally.
• CTC EcoZenith i555 Pro must be transported and
stored in an upright position. When moving the
product, it can be placed temporarily on its back.
• Remove the packaging and check before
installation that the product has not been
damaged in transit. Report any transport damage
to the carrier.
• Place CTC EcoZenith i555 Pro on a solid
foundation, preferably made of concrete. If the
product needs to be placed on a soft carpet, base
plates must be placed under the adjustable feet.
• Remember to leave a service area of at least
1 metre in front of the product. Space is also
needed around the product for installation of
insulation and plastic top cover. Refer to the
"Transportation, Unpacking and Installation"
chapter in the Installer section. CTC EcoZenith
i555 Pro must not be lowered beneath floor level.
• Check for missing parts.
• The product must not be installed where the
ambient temperature is higher than 60°C.
• CTCEcoAir510M230V1N~ must have software
version HP control card 20160401 or later.
• CTCEcoAir520M400V3N~ must have software
version HP control card 20160401 or later.
• Register the product for warranty and insurance
via the website
https://ctc.se/kundservice#garantiregistrering
https://www.ctc-heating.com/customer-
service#warranty-registration

8CTC EcoZenith i555 Pro
Turn off the power with an omnipolar switch before doing any work on the product.
The product must be connected to protective earth.
The product is classified as IPX1. The product must not be rinsed with water.
When handling the product with a hoist ring or similar device, make sure that the
lifting equipment, eyebolts and other parts are not damaged. Never stand under the
hoisted product.
Never jeopardise safety by removing bolted covers, hoods or similar.
Any work on the product’s cooling system should be carried out by authorised
personnel only.
The product’s electrical systems should only be installed and serviced by a qualified
electrician.
-If the supply cord is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
Safety valve check:
-Safety valve for boiler/system to be checked regularly.
The product must not be started if it is not filled with water; instructions are in the
“Pipe installation” section.
WARNING: Do not switch on the product if there is a possibility that the water in the
heater is frozen.
This device can be used by children from the age of eight years and above and by
people with reduced physical, sensory or mental ability or lack of experience or
knowledge if they have been taught, either with supervision or with the instructions
provided, how to use the device safely and understand the risks involved. Children
should not play with the device. Cleaning and maintenance should not be carried
out by children without supervision.
If these instructions are not followed when installing, operating and maintaining the
system, Enertech’s commitment under the applicable warranty terms is not binding.
Safety instructions

9CTC EcoZenith i555 Pro
1. Design of CTC EcoZenith i555 Pro
This chapter illustrates the main components and describes the subsystems
which, in different configurations, form part of the main system. For
more information about the EcoZenith configurations, refer to the “Pipe
connections” chapter.
1.1 Main components
Control system
The EcoZenith is equipped with
an intelligent control system which
controls and monitors all parts of
the heating circuit. The EcoZenith
ensures that the most economical
way of heating the house and the
hot water is prioritised.
Finned Coil for DHW
The EcoZenith is equipped with a
well dimensioned finned copper
coil and does not contain any
heater which can rust. A low
temperature can be maintained
without the risk of legionella
bacteria.
Electric heaters in upper tank
Built-in upper electric heater.
When connected to a heat pump,
the immersion heater acts as
additional heat.
(The top electric heater is an
optional extra)
Lower tank
In the lower tank, DHW is pre-
heated in the coil by the solar- or
heat pump-heated water.
Solar Coil Connections
The well dimensioned, 10 m long,
finned coil can be connected
directly to the solar panels.
Electric heater lower
Built-in lower electric heater.
Bivalent shunt valve
The automated mixing valve
ensures that an even heat is
continuously supplied to the
heating circuit. The valve has
double ports and takes the warm
radiator water from the solar and
heat pump heated water in the
lower part of the tank first.
Upper Tank Connections
The upper tank, the additional part,
can be heated by a heat pump and
connected to heat sources such as
electric, gas, oil and pellet boilers.
Heat from a wood boiler is delivered
to this part. Connections are placed
symmetrically on both sides of the
tank.
Insulation
The tank is insulated by 90 mm
thick molded polyurethane foam
for minimum heat loss.
Lower Tank Connections
The heat pump and solar system
are connected to the lower tank.
Water to be heated by wood
boiler is taken from here, and
heat which is to be stored in a
buffer tank is also taken from this
part. Connections are placed
symmetrically on both sides of the
tank.
Insulated tank divider
Between the tank’s upper and
lower tank is an insulated tank
divider. This provides high
temperatures in the upper tank
for good DHW capacity and low
temperatures in the lower tank for
best operating economy.
Heat Distribution Pipes
The heat distribution pipes ensure
that heat from the solar coil is
directed to the upper tank and that,
after DHW is drawn off, cooled
water is directed to the lower part of
the tank to be heated again by solar
energy or heat pump.
Upper tank
In the upper part of the tank, the
warm water in the coil is heated
up to the desired temperature.
Fresh Water Connections
Here you connect the property’s fresh
water connections. The cold water
is fed down to the lower part of the
coiling, where it is preheated.
Top Connection
For connection of expansion
vessel and/or safety valve.

10 CTC EcoZenith i555 Pro
CTC EcoZenith i555 Pro is a multi-tank with almost
unlimited possibilities
The EcoZenith is intended for houses and properties with water-borne heat.
The multi-tank features include intelligent control, a water volume of 540
litres, bivalent mixing valve, two DHW coils, a solar coil and two 9 kW electric
heaters giving a total of 18 kW. You can easily add another electric heater as
an accessory to provide total power of 27 kW, controlled by the EcoZenith.
The control is specially adapted to simultaneously control up to three of
CTC’s heat pumps, but it will also control and optimise the following:
• Pool
• Energy storage in buffer tanks
• Three heating circuits simultaneously
• Solar panels and borehole recharging
• Cooling (passive cooling), floor or fan convector
• DHW circulation with time control
• Charging of extra DHW tank
• Connected wood boiler, gas/oil boiler and pellets
The CTC EcoZenith is well-insulated with 90 mm PUR and is well provided
with connection options on both sides, ensuring clean and easy pipe
installations. It also provides for extensions and additions to the system in
the future.
The CTC EcoZenith i555 Pro is divided into two tanks which are isolated
from each other in order to be able to hold different temperatures in the two
tanks. This provides optimal function and operating economy.
The upper and the lower tanks are connected by heat distribution pipes
which are especially developed for the solar energy to be able to form layers
optimally in the entire volume of the tank and act as flow-through of the tank
for wood operation, for instance (see picture).
Also refer to the "Electric heaters" section in the "Detailed Menu
Descriptions" chapter (Installer/Settings/Electric Heaters).
Also refer to the "Lower tank" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Lower Tank).
2. Function of CTC EcoZenith i555 Pro
iRemember that
menus which have
not been defined
cannot be seen.
Upper tankLower tank

11CTC EcoZenith i555 Pro
2.1 Heating Circuit
The EcoZenith is equipped with a bivalent mixing valve, which always
delivers an even temperature, without variation, to the heating circuit. The
bivalent mixing valve is controlled by an outdoor sensor and, optionally, by a
room sensor.
When operating with outdoor sensor alone, the desired curve inclination and
adjustment are set. These values differ from home to home and should be
adjusted to suit your needs.
A room sensor that is correctly positioned provides more comfort and
more heating circuit savings. The room sensor picks up the current indoor
temperature and adjusts the heat, for example when it is windy outside and
the house is losing heat, which the outdoor sensor is unable to register.
During solar insolation, or other instances when heat builds inside the house,
the room sensor can also reduce the heat, thus saving energy. Another way
to save energy is to use the night reduction function, which reduces the
indoor house temperature at certain times or periods, for example during the
night or when you are away on holiday.
The EcoZenith can control up to three heating circuits, each with its own
room sensor. For instance, one radiator circuit plus two floor heating circuits.
The bivalent mixing valve always attempts to use the energy from the lower
tank first; this is especially important when a heat pump or solar panel
is connected to the EcoZenith. This ensures the system delivers good
operating economy and that the upper tank stays warm to provide an
abundance of DHW.
Also refer to the "Heating circuit" section in the "Detailed Menu
Descriptions" chapter (Installer/Settings/Heating Circuit).
Also refer to the "Room temperature" section in the "Detailed Menu
Descriptions" chapter.

12 CTC EcoZenith i555 Pro
2.2 DHW
The final heating of the hot water takes place in the upper tank. It also
acts as additional heating for the heating circuit when the lower tank is not
enough.
The DHW is heated using two finned copper tube coils of approx. 40 metres
connected in parallel. The coils preheat the water in the lower tank and
the water reaches maximum temperature in the upper tank. The low inner
volume and high rate of water turnover in the copper coil prevents build-up
of bacteria.
With double coils, high draw-off flows can be obtained, as the heat
conduction area is finned, on the inside as well as the outside. For more
information on settings and tips, refer to the "DHW" chapter.
2.2.1 DHW circulation
The DHW coil has a connection for DHW charging, which can be used
to heat an external cold water tank when greater tap capacity of DHW is
required and allows connection of DHW circulation. This means that hot
water is always available at the tap. To save energy the HWC pump can be
time controlled from the EcoZenith.
Also refer to the "Upper tank" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Upper Tank).

13CTC EcoZenith i555 Pro
Upper tank
Lower tank
port 1
port 2
2.3 Heat pump
The EcoZenith is designed with two parts in order to ensure the heat pump
operates to maximum possible economy.
The heat pump is connected via two 3-way valves to the EcoZenith and
ensures that the heat is directed into the upper and lower tanks, respectively.
For instance, when the heat pump pumps towards the upper tank, the 3-way
valves send the flow to the two uppermost connections, so that the flow
enters port 1 and exits through port 2.
The heat pump operates in two different ways, depending on whether it is the
upper tank or the lower tank being charged.
2.3.1 Upper tank
The final hot water heating takes place in the upper tank. This means that, with
a high upper tank temperature, an ample DHW supply is obtained.
The upper tank has a factory-set stop temperature of 55°C, which means
that the heat pump will work to achieve this temperature in the upper tank.
When DHW is being drawn off and the temperature in the upper tank falls
to 5°C below the stop temperature, the heat pump starts up and raises the
temperature towards the set stop temperature.
The stop temperature can be adapted to DHW needs and to the heat pump
model installed.
When there is also a need for heat in the house, the 3-way valves will
automatically reverse direction and the heat pump continues to heat the
lower tank as soon as the stop temperature 55°C in the upper tank has been
reached. If the upper tank has not reached the stop temperature 55°C within
the factory-set charging period of 20 minutes, the 3-way valves reverse the
direction and the heat pump charges the lower tank. This is to prevent loss of
temperature in the heating circuit.
Also refer to the "Upper tank" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Upper Tank).
Pressure/level switch
In some cases, extra protection is required due to local requirements or
provisions. For example, the requirement in some areas is for the system to be
installed within a water catchment area. The pressure/level switch connects to
terminal blocks K22/K23/K24/K25 and is then defined in the "Installer/Define/
Def. Heat Pump" menu. If there is a leak, the compressor and brine pump stop
and the "Flow/level switch" alarm appears on the display.

14 CTC EcoZenith i555 Pro
8 kW 12 kW
17 kW17 kW
8 kW 12 kW 17 kW
17 kW 17 kW17 kW
2.3.2 Lower tank
In the lower tank the heat pump operates to provide heat to the heating
circuit.
Heat pump operation is of so-called floating condensation type. However,
the lower tank never drops below the lowest set temperature.
Floating condensation operation is where the heat pump heats to the
temperature required by the heating circuit. This temperature varies
depending on the outdoor temperature and which set inclination and
adjustment (the heat curve for the house) has been chosen. If a room sensor
is installed, this will affect the temperature required in the system. During
spring and autumn, when it is not so cold outside, a lower temperature is
needed for the heating circuit, but during winter a higher temperature is
needed to maintain the desired indoor temperature.
Savings from a heat pump are directly linked to the COP value. COP means
the output divided by the supplied power. COP 4 therefore means, for
instance, that the heat pump delivers 4 kW and uses 1 kW ( ).
The lower the temperature the heat pump needs to deliver, the higher the
COP value obtained from the heat pump, as this will involve the compressor
working to better advantage.
Therefore, the heat pump heats only to the temperature in the lower tank
required by the heating circuit. This saves compressor life and maximises
operating economy. The electric heater, which is factory installed in the lower
tank, is blocked as long as the heat pump is operating.
The electric heater is only brought into use if the heat pump is blocked for
any reason.
Also refer to the "Lower tank" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Lower Tank) and the "DHW" chapter.
4
1= 4
2.3.3 More Than One Heat Pump
If more than one heat pump is installed, heat pumps two and three are
connected to the lower tank only.
Only one of the heat pumps alternates between DHW and heating operation.
2.3.4 Prioritisation of heat pump operation
When the product controls two or more heat pumps of different sizes, the
connected heat pumps are divided into two categories: small or large heat
pumps. Dividing the available heat pumps into two different size categories
means it is possible to change the output in small steps and in this way
achieve modulating operation.
When, for example, a need for power occurs, a large heat pump is switched
on at the same time as a small heat pump is switched off, and vice versa
when reducing power. Within both the small and large groups, reciprocal
heat pump operation is prioritised according to accumulated operation time.
When combining different types of heat pumps, air/water and ground source
pumps are prioritised according to the current outdoor temperature.
In the example above, 8 kW and 12 kW
are classed as small, while the two 17 kW
machines are classed as large.
In the example above, 8 kW and 12 kW
are classed as small, while the four 17 kW
machines are classed as large.

15CTC EcoZenith i555 Pro
2.3.5 Different Heat Pumps
EcoZenith can control different types of heat pumps, CTC EcoAir (air
source heat pump) and CTC EcoPart (ground source heat pump). The
desired outdoor temperature at which the CTC EcoAir is prioritised over
the CTC EcoPart is set in the “Installer/Settings/Heat pumps 1, 2, 3” menu
under “Prio EcoAir/EcoPart”. This means that the operating economy can
be maximised, as at a high outdoor temperature a greater energy yield is
obtained from CTC EcoAir than from CTC EcoPart. This combination works
exceptionally well for installations where, for example, the ground source
heat pump is undersized. An air/water heat pump can then be used to give
the bedrock a longer time to recover and provide the system with increased
power.
Remember that only one heat pump can be connected via the 3-way valves
and charge DHW in the upper tank.
Also refer to the "Heat pump" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Heat Pump).

16 CTC EcoZenith i555 Pro
2.3.6 Speed-controlled charge pump (accessory
from CTC)
Each heat pump should be provided with a separate charge pump that is
controlled in tandem with its respective heat pump. If a speed-controlled
PVM charge pump (accessory from CTC) is connected to the heat pump
and controlled from the EcoZenith, the flow will be automatically set without
any adjustment needed via the control valve. In the upper tank the speed of
the charge pump will be controlled so that the heat pump always delivers its
highest possible temperature into the top of the EcoZenith. This provides for
quick access to DHW when the heat pump starts.
Towards the lower tank the speed-controlled charge pump will work for a
fixed difference between flow and return from the heat pump.
If a speed-controlled charge pump is not installed, the flow must be adjusted
manually, and the difference between incoming and outgoing water from the
heat pump will vary, depending on the operation conditions during the year.
In cases where an air/water heat pump is installed and the outdoor
temperature is lower than +2°C, the charge pumps are started in order to
protect against frost. If a speed-controlled charge pump is installed, the pump
will only work at 25% of its maximum capacity. This provides for increased
savings on the charge pump’s operating economy, and the heat losses in the
EcoZenith are reduced compared to a conventional on/off charge pump.
Also refer to the "Heat pump" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Heat Pumps 1-3).
2.4 Wood boiler
The EcoZenith can be connected to a wood boiler, such as the CTC V40.
The primary flow from the wood boiler is connected to the top of the
EcoZenith and the return flow to the wood boiler is connected to the lowest
connection on the lower tank.
When firing is started and the flue gas sensor and/or boiler sensor reaches
a set value (menu: “Installer/Settings/Wood boiler” factory-set “100/70°C”),
the control goes into wood operation status when the temperature of the
lower tank is above or equal to its reference value (setpoint). When the flue
gas sensor is below the set value, wood operation status is interrupted.
It is recommended the wood boiler be provided with a charge system.
A charge system such as Laddomat 21 is recommended for optimum
performance. The charge pump in the charge system must be controlled
from the wood boiler. In special cases, such as operation with a water
jacketed stove, the charge pump may be controlled from the EcoZenith
without installing a charge system.
If the wood-fired system needs more water than the 540 litres contained in
the product, the system needs to be supplemented with an accumulator
tank.
Also refer to the "Wood boiler" section in the "Detailed Menu
Descriptions" chapter (Installer/Settings/Wood Boiler).
Schematic diagram only the installer adds expansion vessels, safety valves, etc., and sizes the system.

17CTC EcoZenith i555 Pro
2.5 Additional boiler (pellets, oil, gas,
electricity)
The EcoZenith can control an external additional boiler (pellets, oil, gas,
electricity). The additional boiler is connected to the upper tank. Use the
menu to select whether the external additional boiler should have high or low
priority. If high priority is selected, the external additional boiler is activated
before the electric heater(s); when low priority is selected, the electric
heater(s) is/are activated first.
After a certain delay, which is factory set at 120 minutes, the unit with low
priority is also started and helps the heat source with high priority.
If the electric heaters are the lowest prioritised additional heat, the following
must also be fulfilled in order for them to start: The temperature in the upper
tank must be 4°C below the setpoint for the additional heat.
If the external boiler is the lowest prioritised additional heat, the following
must also be fulfilled for it to start: The temperature in the upper tank must
be 3°C below the setpoint for the additional heat and the electric heaters
must have moved along to the desired value (100% of set value) or to 6 kW
in the first two hours after a power failure.
The EcoZenith handles start and stop of the charge pump between the
external boiler and the EcoZenith.
The charge pump starts when there is a need for an external boiler.
If a temperature sensor is installed and an extra boiler is defined, the charge
pump starts when an external boiler has reached the set temperature
(factory set at 30°C).
The charge pump stops when there is no need for an external boiler. A stop
delay of the charge pump can be set so that the charge pump runs even if
the external boiler is off.
Also refer to the "External boiler" section in the "Detailed Menu
Descriptions" chapter. (Installer/Settings/Ext boiler).
Schematic diagram only the installer adds expansion vessels, safety valves, etc., and sizes the system.

18 CTC EcoZenith i555 Pro
illustration 2
illustration 1
2.6 Solar Energy
The EcoZenith contains a 10 m long 18 mm finned and internally grooved
solar coil which manages approx. 10 m² of solar panel. On larger solar panel
installations, the solar energy is connected via an external heat exchanger
(see figure 2). The heat exchanger is connected to the upper and lower
connections on the lower part of CTC EcoZenith (either side is possible). If
a greater number of panels is connected, one or more buffer tanks can also
be installed in the system. More information on function and control of buffer
tanks can be found in the "Extra Buffer Tank" section.
If the solar panels produce a temperature which is more than 7 degrees
(factory-set) higher that the sensor (B33), the charge pump starts and
transfers the solar energy to the lower tank. The speed-controlled PWM
pump controls the flow so that it always delivers a temperature which is
7°C higher. This means that if solar panel output rises, the charge pump will
increase the flow, and if solar panel output decreases, the charge pump will
reduce the flow. When the temperature in the lower tank increases or the
solar panel loses temperature, and the difference between the temperature in
the solar panel and the lower tank is below 3 degrees (adjustable), charging
stops. Charging will not restart until the solar panel is again 7 degrees
warmer than the lower tank.
When the temperature in the lower tank rises and becomes warmer than
the upper tank, by the laws of physics, heat will rise into the heat distribution
pipe and layer itself into the right temperature level in the upper tank
through perforated holes in the distribution pipes. The colder temperature
in the upper tank will, in the same way, sink down and distribute itself in
its temperature zone in the lower tank through the distribution pipe which
descends into the lower tank. Based on the factory setting, the sun will heat
the lower tank in the EcoZenith to 85°C before the charging is stopped.
Also refer to the "Solar panels" section in the "Detailed Menu
Descriptions" chapter (Installer/Settings/Solar Panels).
Schematic diagram only the installer adds expansion vessels, safety valves, etc., and sizes the system.

19CTC EcoZenith i555 Pro
2.7 Recharging Bedrock/Ground
If a liquid/water heat pump is connected, a 3-way valve can be installed on
the solar circuit and connected to the brine circuit (the coil in the bedrock
or the ground heat coil). The solar panel temperature should be factory set
at 60°C warmer than the brine temperature for charging to start. When the
difference between the temperature in the solar panel and the brine circuit
falls to 30°C, charging is stopped. If the brine circuit becomes warmer than
the factory-set value of 18°C, recharging will also be interrupted, as the
temperature then becomes too high for the heat pump to work.
Safety measures for the collector/solar system are available.
Also refer to the "Protection collector" section in the "Detailed Menu
Descriptions" chapter (Installer/Settings/Solar Panels/Protection
Collector).
Also refer to the "Winter mode" section in the "Detailed Menu
Descriptions" chapter (Installer/Settings/Solar Panels/Winter Mode).
Schematic diagram only the installer adds expansion vessels, safety valves, etc., and sizes the system.

20 CTC EcoZenith i555 Pro
2.8 External DHW tank
An external DHW heater can be connected to the EcoZenith. This results in a
greater stored DHW volume, which contributes to higher DHW capacity.
The incoming cold water first passes through the EcoZenith where it is
heated before it flows into the DHW tank and out to the property’s taps. This
means that, when the temperature from the EcoZenith is no longer sufficient,
the entire volume of the DHW tank is still there to be used.
When the temperature in the upper tank of the EcoZenith is factory set 5°C
warmer than in the external DHW tank, the charge pump starts. The heat
from the upper tank charges the DHW tank until the increase in temperature
in the latter does not exceed one degree per three minutes.
When DHW is stored below 60°C, heating of the DHW tank at regular
intervals is necessary to eliminate the risk of Legionella. This function is built
into the EcoZenith. First the upper tank is heated as far as possible using the
heat pump. For the DHW heater to reach 65°C during 1 hour, the electric
heater is allowed to engage to raise the temperature over the final degrees.
The factory setting for this is every fourteen days.
Also refer to the "Upper tank" section in the "Detailed Menu Descriptions"
chapter (Installer/Settings/Upper Tank).
2.9 Pool
A pool is connected to the EcoZenith’s lower tank. Between the EcoZenith and
the pool, a heat exchanger is installed to separate the liquids.
A sensor in the pool starts and stops the pool’s charge pumps in order to
maintain the set temperature in the pool (factory set at 22°C). The temperature
is allowed to fall by one degree before the charge pump starts again. It is
also possible to set the pool priority to high or low, which determines whether
additional heat can be used for heating the pool.
Also refer to the "Pool" section in the "Detailed Menu Descriptions" chapter
(Installer/Settings/Pool).