Thermia iTec Eco User manual

User Guide
iTec Eco
www.thermia.com

The English language is used for the original instructions.
Other languages are a translation of the original instructions.
(Directive 2006/42/EC)
© Copyright Thermia AB

Table of Contents
1 Foreword ............................................... 4
2Safety precautions ......................................... 5
2.1 Important information .................................... 5
2.2 Installation and maintenance ................................ 6
2.3 Service ............................................. 6
2.4 Safety valves ......................................... 6
3About your heat pump ....................................... 7
3.1 Components and functions ................................. 7
3.1.1 Heating ............................................ 7
3.1.2 Hot water ........................................... 7
3.1.3 Defrost ............................................. 7
3.1.4 Cooling ............................................ 8
3.1.5 Auxiliary heat ......................................... 8
3.1.6 Heating system flow control ................................ 8
4Control system ........................................... 9
4.1 Keypad ............................................. 9
4.2 Indicator ............................................ 10
4.3 Display ............................................. 10
4.4 Main Menu .......................................... 11
5 Settings and adjustments ..................................... 12
5.1 Setting operating mode ................................... 12
5.2 Adjusting the indoor temperature ............................. 13
5.3 Distribution circuit 1 and 2 ................................. 15
5.4 Hot water mode ....................................... 15
5.5 Cooling ............................................ 16
5.6 Reading of temperatures .................................. 16
5.7 Reading the operating time ................................. 16
5.8 Calendar ............................................ 17
5.8.1 Setting of temperature reduction during night and day ................. 18
5.8.2 Setting of calendar function (date and time) ....................... 18
5.8.3 Setting of hot water, EVU, silent mode and temperature reduction .......... 18
5.9 Alarm history ......................................... 20
6 Regular checks ........................................... 21
6.1 Checking operation ..................................... 21
6.2 Check the supply line water pressure in the heating circuit ............... 22
6.3 Checking safety valves .................................... 22
6.4 In the event of leakage .................................... 22
6.5 In the event of leakage of R32 refrigerant ......................... 23
6.6 Cleaning the strainer for the heating circuit ........................ 23
7 Default setting in the control computer ............................ 25
8 Installation protocol ........................................ 26
9 Checklist ............................................... 27
10 Service schedule .......................................... 28
User Guide iTec Eco
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1 Foreword
Buying a heat pump from Thermia is an investment in a better future.
A Thermia heat pump is classed as a renewable energy source, which means that it is considerate of our envi-
ronment. It is a safe and convenient solution that provides heating, hot water and in certain cases cooling, for
your home at a low cost.
We thank you for the confidence that you have shown in us by buying a heat pump from Thermia. We hope
that you will benefit from it for many, many years to come.
With best wishes
Thermia Heat Pumps
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2 Safety precautions
2.1 Important information
Warning The front of the indoor and outdoor unit must
only be opened by qualified installers.
Warning This appliance can be used by children aged 8
years and above, and by persons with reduced
physical, sensory or mental capabilities or lack
of experience or knowledge, provided that
they are supervised or have been instructed in
the safe use of the appliance and understand
the hazards involved.
Cleaning and user maintenance must not be
carried out by children, except under adult su-
pervision.
Warning Children are not permitted to play with the
product.
The system can be considered maintenance-free but certain checks are necessary. Contact your installer for any
service work.
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2.2 Installation and maintenance
Caution Only qualified installers may install, operate
and carry out maintenance and repair work
on the indoor and outdoor unit.
Caution Only qualified electricians may do electrical
installation and maintenance on the indoor
and outdoor unit.
Caution Only qualified refrigeration technicians may
work on the outdoor unit refrigerant circuit.
Caution The appliance shall be stored and installed
so as to prevent mechanical damage from
occurring.
2.3 Service
Only qualified personnel may do service on the following components:
▪The outdoor and indoor units
▪The refrigerant circuit
▪The power supply
▪The safety valves
It is not permitted to carry out construction modifications that may affect the operational safety of the heat
pump.
2.4 Safety valves
▪Never block the connection to a safety valve’s overflow pipe.
▪The following safety precautions apply to the hot water circuit’s safety valve with corresponding over-
flow pipe: Water expands when it is heated, which means that a small amount of water is released from
the system via the overflow pipe. The water that exits the overflow pipe can be hot! Therefore, allow it
to flow to a floor drain to prevent any risk of burning yourself or others.
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3 About your heat pump
3.1 Components and functions
3.1.1 Heating
The heat pump can produce heat for heating (house, pool) and hot water.
The heat pump installation consists of two units: a heat pump placed outdoors and a control unit placed in-
doors. Both can be used in an existing heating system that is to be upgraded and in new builds. Heating and
cooling are supplied to the house via a water borne system.
3.1.2 Hot water
iTec Compact, iTec Total and iTec Total EQ are adapted for hot water production. Production of heating, cool-
ing and hot water cannot occur at the same time. Hot water production is prioritised before heating and cool-
ing.
iTec Compact, iTec Total and iTec Total EQ have integrated 180 litre tanks equipped with a TWS coil (Tap Water
Stratificator) which gives more effective heat transfer and efficient layering of water.
Using a regular time interval (NOT active in COMPRESSOR mode), the water in the tank is given extra heat by
the integrated immersion heater to prevent the build up of bacteria, an anti-legionella function. The factory set
time interval is seven days (can be adjusted).
The hot water requirement is prioritised before the heating requirement. The heating requirement is calculated
from outdoor temperature and set heat curve. An auxiliary heater starts automatically on demand, if installed.
3.1.3 Defrost
During operation the outdoor units' air heat exchanger is cooled by the energy exchange, at the same time the
humidity causes it to become covered in frost at low outdoor temperatures. iTec Eco has an automatic function
to defrost the air heat exchanger using the energy from whatever heat source is currently active.
Defrosting is initiated by low temperature in the refrigerant circuit after the air heat exchanger and, among
other things, is dependent on outdoor temperature, humidity and operating time. The length of defrosting var-
ies depending on the extent of freezing of the air heat exchanger. Defrost continues until the air heat exchang-
er is free of ice and the temperature starts to rise in the refrigerant circuit. After completed defrosting the heat
pump returns to the operating mode before defrosting.
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Warning There is an outdoor temperature sensor on
the back side of the outdoor unit. It is of ut-
most importance that it is not tampered with
or moved. That could cause the defrost func-
tion to fail and inflict damage to the unit.
3.1.4 Cooling
Cooling function is started by the indoor control unit and is primarily temperature controlled. The house's heat-
ing system is cooled by transferring heat to the refrigerant circuit, which is then given off in the air heat ex-
changer of the outdoor unit.
If the hot water heater is installed, the control unit will alternate between cooling and hot water production
with prioritisation for the hot water requirement.
3.1.5 Auxiliary heat
The auxiliary heater is included in iTec Plus, iTec Compact, iTec Total and iTec Total EQ. An auxiliary heater con-
sists of an immersion heater, which is located on the supply line before the reversing valve.
If in AUTO mode, the auxiliary heater automatically starts when the heat demand is greater than the heat
pump’s capacity.
Immersion heaters in iTec Plus, iTec Compact, iTec Total and iTec Total EQ intended for 400V supply have three
heating elements (IMM.HEAT 1, 2 and 3) and can be controlled in five power stages.
Products for 230V have two heating elements (IMM. HEAT 1 and 2) and are controlled in three power stages.
The two stages 4 and 5 cannot be engaged when the compressor is in operation as opposed to stages +4 and
+5 where it is possible.
3.1.6 Heating system flow control
A heating system requires certain conditions in order to be able to run as efficiently as possible. The tempera-
ture difference between the heating system's supply line and return line should strive to be between 5–10°C. If
the difference is greater or less, the heat pump is less efficient and savings are lower.
The speed controlled circulation pump in iTec Plus, iTec Compact, iTec Total and iTec Total EQ always ensures
that the temperature difference is retained. The control system detects if the balance is upset and increases or
decreases the speed of the circulation pump as necessary.
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4 Control system
The indoor unit has an integrated control system which automatically calculates the heating and cooling de-
mand in the house to ensure that the correct amount of heating and cooling is produced and emitted where
necessary.
The control panel is operated using a keypad and information is shown in a display and by an indicator.
N
The information in the display and menus will
vary depending on the menu selection made
and connected accessories.
2
1
3
ROOM
NO HEAT DEMAND
20°C
OPERAT.AUTO
1. Keypad
2. Indicator
3. Display
4.1 Keypad
+ Plus sign used to scroll up a menu and increase the values.
- Minus sign used to scroll down a menu and reduce the values.
> Right arrow used to select a value or open a menu.
< Left arrow to cancel selection or exit a menu.
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4.2 Indicator
The indicator at the bottom of the control panel has three modes:
▪Not lit, means that the heat pump is not powered.
▪When the green light shines continuously, the heat pump has power and is ready to produce heat, cool-
ing or hot water, if not in OFF mode.
▪Flashing green, means an active alarm.
4.3 Display
The display shows information about the heat pump’s operation, status and any alarms.
Sym-
bol Meaning Description
COMPRESSOR Indicates that the compressor is in operation.
LIGHTNING Indicates that the auxiliary heater is in operation. The number indicates what ad-
ditional step is activated.
HOUSE Indicates that the heat pump produces heat.
TAP Indicates that the heat pump produces heat for the water heater.
FFLOW SENSOR Indicates that there is flow through the outdoor unit.
CLOCK Indicates that tariff control is active.
TANK Indicates the level of hot water in the water heater. When hot water is produced
for the water heater, this is indicated by a flashing icon for the tank.
TANK and
LIGHTNING A lightning symbol by the tank symbol indicates peak heating charging in domes- tic hot water tank (anti-legionella function).
DEFROST Displayed when defrosting is active.
FAN Displayed when the fan is active.
COOLING Indicates that the heat pump produces cooling.
POOL Indicates that the heat pump produces pool heating.
OUTDOOR
TEMP Shows the outdoor temperature inside the cloud during screen saver mode.
DCM ACCESSO-
RY INSTALLED Shows that DCM accessory is connected.
ONLINE CON-
NECTION Shows that DCM accessory is connected, and has internet connection.
The following operating information may also appear:
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Message Meaning
ROOM Shows the set ROOM value. Standard value: 20°C.
If the accessory room sensor is installed it shows the actual temperature and the de-
sired indoor temperature is shown within brackets.
START Indicates that there is a need for heat production or hot water and that the heat
pump will start.
EVU STOP Indicates that the additional function EVU is active. EVU is used to switch off the
heat pump during high energy tariffs.
NO HEAT DEMAND Indicates that there is no heating or hot water production demand.
NO COOLING DEMAND Indicates that there is no cooling demand.
COMPRESSOR START --
XX Indicates that there is a need for heat, hot water or cooling and that the heat pump will start in XX minutes.
COMPRESSOR
+IMM.HEAT Indicates that heat production is active with both compressor and auxiliary heater.
START_MIN Indicates that there is a demand for heating or hot water production but that a start
delay is active.
AUX. HEATER Indicates that there is an auxiliary heater demand.
ACT COOLING Displayed if cooling is active.
DEFROST Displayed when defrosting is active.
4.4 Main Menu
The display's INFORMATION menu is used to set and adjust the heat pump functions and is opened by pressing
the left or right buttons. The appearance of the menu will vary depending on the menu selection made and
connected accessories. The basic menu appears as follows:
INFORMATION
OPERAT.
HEATING
HOT WATER
DEFROST
CALENDAR
2
1
3
4
1. Sub-menus
2. Return
3. Cursor
4. If an arrow is shown, it indicates that more sub menus are
continued underneath
Press the + and - buttons to move the cursor between the sub-menus. Press the right button to select a sub-
menu. Press the left button to go back in the menu.
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5 Settings and adjustments
The installer carries out the basic settings of the heat pump at installation. A number of settings and adjust-
ments that you can carry out yourself are described below.
N
Before changing the control computer’s set-
tings, first find out what these changes mean.
Make a note of the default setting.
5.1 Setting operating mode
COMPRESSOR
OPERAT.
AUX. HEATER
HOT WATER
AUTO
1. Open the menu OPERAT. in the INFORMATION menu. The asterisk
shows the current selection
2. Mark new mode using + or – button.
3. Press the right button once to confirm the choice.
4. Press the left button twice.
The following operating modes can be selected:
Operating
mode Meaning
(OFF) The installation is fully switched off. This mode is also used to acknowledge and reset
alarms.
AUTO The heat pump automatically controls the compressor operation and auxiliary heater (if in-
stalled and activated in the system).
COMPRESSOR The control system is controlled so that only the outdoor unit (compressor) is allowed to
operate. In this operating mode there won't be any auxiliary heating backup, if there's a
need for it and also peak heating charging (anti-legionella function) of the hot water will
not run because the auxiliary heater is not used.
AUX. HEATER The control system only permits the auxiliary heater to be in operation (if installed and acti-
vated in the system).
HOT WATER In this mode the heat pump only produces hot water. No heat is supplied for space heat-
ing.
Warning If any operation mode other than AUTO or
AUX. HEATER is to be used during the winter
season, the water in the heating system must
be drained. Otherwise any alarms triggered
that will cause the outdoor unit to stop might
lead to freezing damage to the system.
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5.2 Adjusting the indoor temperature
The indoor temperature is adjusted by changing the heat curve, which is the control system’s tool for calculat-
ing the heating demand, the integral value. The integral value is determined by comparing the actual tempera-
ture of the heating system's supply line with the calculated value, the setpoint value. The heating requirement
is calculated from the current outdoor temperature and heat curve setting.
The heat curve will be adjusted in connection with installation. It may be adapted later on, however, to obtain a
pleasant indoor temperature in any weather conditions. A correctly set heat curve reduces maintenance and
gives energy efficient operation.
There are two ways of adjusting the heat curve, partly in the HEATING sub-menu, partly with the ROOM value.
Adjusting CURVE
A typical heat curve is shown below. When the outdoor temperature is 0°C the heat pump control tries to make
the temperature in the supply line 40°C. At hotter or colder outdoor temperatures than 0°C the set point that
the control regulates against is lowered or raised respectively. When you increase the CURVE value, the heat
curve will become steeper and when you decrease the CURVE value, the heat curve will become flatter. This is
the most energy and cost efficient way to set the indoor temperature and should therefore be used for long
term temperature settings.
4
2 0 0 -2 0
2 4
4 0
5 6 2
3
1
5
1. Supply temperature (°C)
2. Maximum setpoint value
3. Outdoor temperature (°C)
4. 0°C
5. Set value (standard 40°C)
The following parameters can be adjusted in the HEATING menu:
Parameter Description
CURVE If the CURVE value is increased, the heat curve will become steeper and if the value is de-
creased, it will become flatter. Raise or lower as necessary to obtain as even indoor tempera-
ture as possible.
MIN Lowest set point for supply temperature.
MAX Highest set point for supply temperature.
CURVE +5 Used to adjust the heat curve at an outdoor temperature of +5°C.
CURVE 0 Used to adjust the heat curve at an outdoor temperature of 0°C
CURVE -5 Used to adjust the heat curve at an outdoor temperature of -5°C.
HEAT STOP This function stops all production of heat when the outdoor temperature is equal to, or high-
er than, the set heat stop value. (Default value is 17°C)
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Parameter Description
DURING
COOLING Choose between the following modes: AUTO (According to set temperature), OPEN (Fully open circuit for cooling) or CLOSED.
CONSTANT
TEMP The temperature that the Distr. Circ. 1 demands from the buffer tank and distributes to the heating system. Only applies when the buffer tank is activated and with Distr. Circ. 1 connec-
ted.
SETBACK
TEMP The temperature that will apply at temperature setback controlled from the CALENDAR menu.
ROOM FAC-
TOR Only displayed if an accessory Room temperature sensor is installed. Determines how great an impact the room temperature is to have when calculating the supply temperature. For un-
der floor heating it is recommended that ROOM FACTOR is set to 1, 2 or 3. For radiator heat-
ing it is recommended that ROOM FACTOR is set to 2, 3 or 4. Impact: 0 = no impact, 4 = large
impact.
Warning High temperatures in an underfloor heating
system can damage floor coverage such as
parquet and laminate floors. The supply line
temperature must not exceed the values rec-
ommended by the floor manufacturer.
Adjust the heat curve in the HEATING sub-menu as follows:
HEATING
CURVE
MIN
MAX
CURVE +5
CURVE -5
CURVE 0
HEAT STOP
40˚C
10˚C
55˚C
0˚C
0˚C
0˚C
17˚C
1. Open the HEATING sub-menu in the INFORMATION menu
2. Mark desired parameter using + or – button.
3. Open the parameter by pressing the right button once.
4. Raise or reduce the value with the + or - button.
5. Press the left button three times.
Adjusting ROOM values
The heat curve and therefore the indoor temperature can be affected by changing the "ROOM" value. If the
ROOM value is used to affect the system’s heat curve, the heat curve does not become steeper or flatter, which
the curve becomes if the CURVE value changes, instead the entire heat curve is moved by 3°C for every degree
change of the ROOM value.
N
For a temporary increase or reduction of the
indoor temperature, adjust the ROOM value
instead of the heat curve.
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N
A heat curve and ROOM temperature set too
low will affect the defrost functionality. Make
sure to not go below 16°C on the indoor tem-
perature.
Change the ROOM value as follows:
1. Press either the + or - button once to open and change the ROOM value.
2. Raise or reduce the ROOM value using the + or - buttons to change the indoor temperature.
3. Wait ten seconds or press the left button once to exit the menu.
5.3 Distribution circuit 1 and 2
In addition to the main circuit for heating and cooling two distribution circuits can be controlled individually.
The same parameters are used for these as in the main circuit (menu HEATING).
5.4 Hot water mode
HOT WATER switched on will enable hot water production. With SUPER-ECO switched on, the heat pump will
produce hot water in the most economic way possible. If you should want a prioritization on the amount of hot
water and a faster hot water production you should change mode to either ECO or COMFORT. By activating
TOP-UP the heat pump can immediately start to heat the water heater using the compressor and electrical
auxiliary heater until the tank is fully heated. The TOP-UP function has to be reactivated each time it is needed.
HOT WATER
HOT WATER
TOP-UP
MODE
ON
COMFORT
SUPER-ECO
MODE
ECO
▪"COMFORT" is the choice for customers with large demands of hot water availability.
▪"ECO" can be selected as the best compromise between energy efficiency and hot water availability.
▪"SUPER-ECO" will give the most energy efficient hot water production and is often sufficient for house-
holds with low to moderate hot water consumption.
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5.5 Cooling
COOLING is used to activate cooling function. DESIR.COOL TEMP. is the de-
sired temperature for cooling. COOL.MODE ACTIVE gives the lowest out-
door temperature with cooling operation is permitted.
Caution Low temperatures in the system can cause
condensation on pipes and pipe connections,
which could cause moisture damage to the
building. Make sure every pipe and pipe con-
nection is properly insulated if cooling stop
temperature is set to below 16°C (default).
5.6 Reading of temperatures
OUTDOOR
ROOM
OP. DATA
CONDENSER OUT
SUPPLY LINE
CONDENSER IN
-2˚C
HEAT DEMAND 58˚C
20˚C
40(42)˚C
HOT WATER 48˚C
38.5˚C
34.3˚C
No values can be changed in this menu. The set point value for the supply
line is shown within the brackets.
The different temperatures that the installation has are shown here. All temperatures are stored back in time so
that they can also be displayed in the form of graphs.
If ROOM shows 20°C the heat curve is unaffected. If ROOM shows higher or lower, this indicates that the heat
curve has been adjusted up or down.
5.7 Reading the operating time
0H
0H
0H
0H
0H
0H
0H
COMPRESSOR
OPERAT. TIME
HEATING
COOLING
IMM. HEAT 1
IMM. HEAT 2
IMM. HEAT 3
HOT WATER
COMPRESSOR shows the total time in hours that the heat pump has been
in operation since installation. HEATING and COOLING shows the time the
heat pump has been producing heat and cooling. IMM. HEAT 1, 2 and 3 re-
fer to the immersion heater and its different power stages.
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5.8 Calendar
The following functions can be controlled via calendar:
▪Blocking hot water production
▪Stopping the heat pump at high energy tariff (EVU)
▪Reducing the noise of the fan (gives reduced performance)
▪Reducing the temperature in the heating and distribution circuits.
Do as follows:
1. Select which function is to be controlled
2. Select a CALENDAR SETTING (up to 8 can be selected for each function)
3. Select the menu TIME FUNCTION if the function should be over a continuous time period (DATE) or be
recurring (DAYS / WEEK).
4. Select start and stop times and date and weekdays in the TIME SETTING menu.
TIME SETTING
START 12:00
14:30
*
*
*
WEDNESDAY
THURSDAY
FRIDAY
STOP
MONDAY
TUESDAY
Examples of a recurring calendar control (DAYS / WEEK)
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5.8.1 Setting of temperature reduction during night and day
To set the TEMP. REDUCTION, do as follows:
1. Press left arrow (<) to enter the INFORMATION menu.
2. Press (-) button to navigate down to HEATING menu and press right arrow (>) to enter.
3. Press (-) button to navigate down to SETBACK TEMP menu and press right (>) arrow.
4. Set the temperature with the (+) and (-) buttons.
5. Press left arrow (<) to confirm the temperature.
6. Press left arrow (<) to leave the SETBACK TEMP menu and return to the INFORMATION menu
5.8.2 Setting of calendar function (date and time)
To set the date and time (for the calendar function to work properly), do as follows:
1. Press left arrow (<) to enter the INFORMATION menu.
2. Press (-) button to navigate down to CALENDAR and press right arrow (>) to enter.
3. Press the right arrow (>) once to navigate to the time setting (CLOCK).
4. Set today's time with the (+) and (-) buttons and confirm with the right arrow (>).
5. Press (-) button once to navigate down to the date setting (DATE and YEAR).
6. Press the right arrow (>) to enter the DATE setting.
7. Set today's date and year with (+) and (-) buttons.
8. Press right arrow (>) to confirm.
9. Press left arrow (<) to leave the menu and return to INFORMATION menu.
TIME SETTING
START 18-JUN-2020
09:00
STOP 20-AUG-2020
16:00
5.8.3 Setting of hot water, EVU, silent mode and temperature reduction
The time period can either be set to a continuous or a recurring time period.
To set the date and time period for these functions, do as follows:
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1. From the main menu, press left arrow (<) to enter the INFORMATION menu.
2. Press (-) button to navigate down to CALENDAR and press right arrow (>) to enter.
3. Press (-) button to navigate down to the function you wish to set (HOT WATER, EVU, SILENT MODE or
TEMP REDUCTION).
4. Press right arrow (>) button once to set Calendar 1 (you can set up to eight different calendars).
5. Press right arrow (>) to enter the CALENDAR setting menu.
6. Press right arrow (>) to enter the TIME FUNCTION menu.
7. Use (+) and (-) buttons to program the function by DATE (continuous) or DAYS/WEEK (recurring).
8. Press right arrow (>) to confirm the selection. An asterisk symbol (*) is shown on the screen.
9. Press left arrow (<) to leave the TIME FUNCTION.
10. Press (-) button once and press right arrow (>) to enter the TIME SETTING menu.
11. Set the start and stop date and time with the (+) and (-) buttons. You can also set the weekday (MONDAY
to SUNDAY) if you have selected DAYS/WEEK, see the example below.
12. Press left arrow (<) to leave the menu and return back to INFORMATION menu.
Example for setting SILENT MODE every day between 22:00 and 07:00:
The FIRST start and stop time for the desired calendar func-
tion: Scroll down to access all the days of the week:
The SECOND start and stop time for the desired calendar
function: Scroll down to access all the days of the week:
N
For the calendar function to work, the STOP
time must be set to no later than 23:59 and
the START time to no earlier than 00:01. This
means if you want the calendar to work over
night, for any calendar function, you will have
to set TWO start and stop times.
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5.9 Alarm history
NAME ALARM displays information about up to 10 alarms with type of alarm, time and date.
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