Thermia ATEC User manual

User manual
Atec
086L0130 Rev. 1 EN

Thermia Värme AB reserves the right to
make changes to components and specifi‐
cations without prior notice.
© 2010 Thermia Värme AB.
The Swedish language is used for the orig‐
inal instructions. Other languages are a
translation of the original instructions.
(Directive 2006/42/EC)

Contents
1 Foreword ................................................................................................... 3
2 Safety precautions ...................................................................................... 4
2.1 Installation and maintenance ........................................................................ 4
2.2 System modifications ................................................................................... 5
2.3 Safety valve ................................................................................................ 5
3 About your heat pump ................................................................................ 6
3.1 Components and functions ............................................................................ 6
4 Control system ......................................................................................... 12
4.1 Keypad ..................................................................................................... 12
4.2 Indicator ................................................................................................... 12
4.3 Display ..................................................................................................... 13
4.4 Main Menu ............................................................................................... 15
5 Settings and adjustments .......................................................................... 16
5.1 Setting operating mode ............................................................................... 16
5.2 Adjusting the indoor temperature ................................................................. 17
5.3 Distribution circuit 1 and 2 ......................................................................... 20
5.4 Hot water ................................................................................................. 20
5.5 Cooling ..................................................................................................... 20
5.6 Reading off temperatures ............................................................................ 21
5.7 Reading the operating time ......................................................................... 21
5.8 Manual defrost, outdoor unit ....................................................................... 21
5.9 Calendar ................................................................................................... 22
5.10 Alarm history .......................................................................................... 23
6 Regular checks ........................................................................................ 24
6.1 Checking operation .................................................................................... 24
6.2 Check the water level in the heating circuit ................................................... 25
6.3 Checking safety valves ............................................................................... 25
6.4 In the event of leakage ............................................................................... 26
6.5 Cleaning the strainer for the heating circuit ................................................... 26
7 Default setting in the control computer ........................................................ 28
8 Installation protocol .................................................................................. 29
9 Check list ................................................................................................ 30
10 Service schedule .................................................................................... 32
086L0130 Rev. 1 EN – 1

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 environment. It is a safe and con‐
venient 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 Värme AB
User manual 086L0130 Rev. 1 EN – 3

2 Safety precautions
The heat pump cover and control unit cover must only be
opened by authorised service technicians.
This product is not intended for persons (including children)
with reduced physical, sensory or psychological capacity, or
who do not have knowledge or experience, unless supervised
or they have received instructions on how the apparatus
functions from a safety qualified person.
Children are not permitted to play with the product.
Before changing the control computer’s settings, first find out what
these changes mean.
Contact your installer for any service work.
2.1 Installation and maintenance
DANGER! Only authorized installers may install, operate and
carry out maintenance and repair work on the heat pump.
DANGER! Only authorised electricians may carry out electrical
installations affecting the heat pump.
DANGER! Only authorized refrigeration technicians may work
on the refrigerant circuit.
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2.2 System modifications
Only authorized installers may carry out modifications on the following
components:
•The heat pump unit
•Water and electrical installations
•The safety valve
Do not carry out construction installations that may affect the opera‐
tional safety of the heat pump.
2.3 Safety valve
The following safety precautions apply to the hot water circuit’s safety
valve with corresponding overflow pipe:
•Never block the connection to the safety valve’s overflow pipe.
•Water expands when it is heated, this 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 where there is no risk of burning yourself.
User manual 086L0130 Rev. 1 EN – 5

3 About your heat pump
The heat pump is a complete heat pump installation that consists of
two basic units: a heat pump placed outdoors and a control unit
placed indoors. The control unit is available in three models in order to
be able to create as optimal system solution as possible, both 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 heat‐
ing system.
3.1 Components and functions
3.1.1 Outdoor unit
3
2
1
4
Pos. Description
1 Fan
2 Electrical cabinet
3 Air heat
exchanger
4 Refrigerant cir‐
cuit
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3.1.2 Control unit
1
Atec Standard
1
2
4
35
Atec Total
1
2
34
Atec Plus
Position Description
1 Control module (transparent in image)
2 Immersion heater
3 Reversing valve
4 Circulation pump
5 Water heater
3.1.3 Heating
The heat pump can produce heat for heating (house, pool) and hot
water.
The hot water requirement is prioritised before the heating require‐
ment. The heating requirement is calculated from outdoor temperature
and set heat curve. An auxiliary heater starts automatically on
demand.
User manual 086L0130 Rev. 1 EN – 7

Heat production is as follows;
•A fan draws the outdoor air through an air heat exchanger (1),
which heats up the cold refrigerant, which evaporates into a gas.
•The refrigerant that is now supplied with energy in the form of
heat is transferred via the 4 way valve (2) to the compressor (3),
where its temperature and pressure are increased.
•The extremely hot refrigerant continues to the flat heat exchanger
(4). Here, the refrigerant is cooled and releases its heat energy to
the heating system (5). The refrigerant’s temperature drops and
condenses to a liquid state.
•The heating system transports the heating energy out to the water
heater or the heating system of the house.
•The refrigerant then passes through the drying filter (6) to the
electronic expansion valve (7) where the pressure and temperature
drop and the process starts again.
1
2
3
4
5
6
7
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3.1.4 Hot water function
Atec Plus and Atec Total are adapted for hot water production. Pro‐
duction of heating and hot water cannot occur at the same time
because the reversing valve for heating and hot water is positioned
after the heat pump and the immersion heater. Hot water production
is prioritised ahead of heat and cooling.
Atec Plus is connected to an existing water heater while Atec Total has
an integrated 180 litre heater equipped with a TWS coil (Tap Water
Stratificator) which gives more effective heat transfer and efficient
layering of water in the heater.
The temperature of the hot water cannot be adjusted. Normally, hot
water production does not cease at a determined temperature but
when the compressor’s operating pressure switch reaches its maxi‐
mum operating pressure, which corresponds to a hot water tempera‐
ture of approximately 50-55°C.
Using a regular time interval, the water in the water heater 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).
3.1.5 Defrost function
During operation the 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. Atec has an automatic function
to defrost the air heat exchanger using the energy from the house's
heating system.
Defrosting is initiated by low temperature in the refrigerant circuit after
the air heat exchanger and, among other things, is dependent on out‐
door temperature, humidity and operating time. The length of defrost‐
ing varies depending on the extent of freezing of the air heat
exchanger. Defrost continues until the air heat exchanger is free of ice
and the temperature starts to rise in the refrigerant circuit. After com‐
pleted defrosting the heat pump returns to the operating mode before
defrosting.
3.1.6 Cooling function
The heart pump produces cooling through a similar process as the
defrosting function.
Cooling function is started by the heat pump control unit and is pri‐
marily temperature controlled. The house's heating system is cooled by
User manual 086L0130 Rev. 1 EN – 9

transferring heat to the refrigerant circuit, which is then given off in
the air heat exchanger.
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.
3.1.7 Speed controlled fan
The fan starts at a nominal speed, which differs depending on the size
of output. The fan speed is adjusted up or down as required which is
determined by the temperatures in the refrigerant circuit.
3.1.8 Electronic expansion valve
When the refrigerant passes the expansion valve the pressure and
temperature of the refrigerant are reduced. In this way the energy in
the outdoor air is available to the refrigerant circuit. By regulating the
opening degree of the expansion valve one can optimise the flow in
the refrigerant circuit in different operating conditions. Control of the
electronic expansion valve is based on the measurements of tempera‐
tures and pressures in the refrigerant circuit and outside air.
3.1.9 Auxiliary heat
The auxiliary heater is included in Atec Plus and Atec Total and is
available as an accessory for Atec Standard. An auxiliary heater con‐
sists of an immersion heater, which is located on the supply pipe
ahead of the reversing valve.
If the auxiliary heater is installed it engages AUTO mode automatically
when the heat demand is greater than the heat pump’s capacity.
Immersion heaters in Atec series intended for 400V voltage supply
have three heating elements (AUX. HEAT 1, 2 and 3) and can be con‐
trolled in five power stages. Products for 230V have two heating ele‐
ments (AUX. 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.
230V 400V
Step 1 3 3
Step 2 6 6
Step 3 9 9
Step 4 12
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230V 400V
Step 5 15
Step +4 12
Step +5 15
3.1.10 Speed (rpm) control
A heat pump requires optimum conditions in the heating system in
order to be able to run as efficiently as possible. The temperature dif‐
ference between the heating system’s supply line and return line must
be constant between 7–10°C. If the differences are greater or less, the
heat pump is less efficient and savings are lower.
The speed controlled circulation pump in Atec always ensures that the
temperature difference is retained. The control equipment detects if
the balance is upset and increases or decreases the speed of the circu‐
lation pump as necessary.
User manual 086L0130 Rev. 1 EN – 11

4 Control system
The heat pump has an integrated control system which automatically
calculates the heating and cooling demand 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.
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
OPERAT. AUTO
20°C
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.
4.2 Indicator
The indicator at the bottom of the control panel has three modes:
12 – User manual 086L0130 Rev. 1 EN

•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, cooling or hot water.
•Flashing green, means an active alarm.
4.3 Display
The display shows information about the heat pump’s operation, sta‐
tus and any alarms.
Table 1. Symbols shown in the display.
Symbol Meaning
COMPRESSOR Indicates that the compressor is in operation.
LIGHTNING Indicates that the auxiliary heater is in operation.
The number indicates what additional step is activa‐
ted.
HOUSE Indicates that the heat pump produces heat for the
heating system.
TAP Indicates that the heat pump produces heat for the
water heater.
F FLOW SEN‐
SOR Indicates that the flow sensor is active (there is flow).
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. A
lightning symbol by the symbol indicates peak heat‐
ing charging (anti-legionella function).
SQUARE Either indicates that the operating pressure switch
has deployed, or that the pressure pipe temperature
has reached its maximum temperature.
DEFROST Displayed when defrosting is active.
User manual 086L0130 Rev. 1 EN – 13

Symbol Meaning
FAN Displayed when the fan is active.
COOLING Displayed if cooling is produced.
A = Active cooling.
The following operating information may also appear:
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 desired 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 produc‐
tion 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 com‐ pressor 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 X(Y) Displayed when defrosting is active. X shows the
actual reached temperature. Y shows at what temper‐
ature defrost is complete.
14 – User manual 086L0130 Rev. 1 EN

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 selec‐
tion made and connected accessories. The basic menu appears as fol‐
lows:
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 indi‐
cates 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.
User manual 086L0130 Rev. 1 EN – 15

5 Settings and adjustments
The installer carries out the basic settings of the heat pump at installa‐
tion. A number of settings and adjustments that you can carry out
yourself are described below.
Before changing the control computer’s settings, first find out
what these changes mean. Make a note of the default setting.
5.1 Setting operating mode
OPERAT.
COMPRESSOR
AUX. HEATER
HOT WATER
AUTO
MANUAL TEST
1. Open the menu OPERAT. in the
INSTALLATION 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 certain alarms.
AUTO The heat pump regulates automatic compressor opera‐
tion and auxiliary heater.
COMPRESSOR The control system is controlled so that only the heat
pump unit (compressor) is allowed to operate. In this
operating mode peak heating charging (anti-legionella
function) of the hot water will not run because the auxil‐
iary heater is not used.
AUX. HEATER The control system only permits the auxiliary heater to
be in operation.
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Operating mode Meaning
HOT WATER In this mode the heat pump only produces hot water, no
heat goes to the heating system.
MANUAL TEST Only displayed when the value for MANUAL TEST is set
to 2 in
The SERVICE menu. Outputs that control components
are activated manually.
Caution! If the operating mode OFF or HOT WATER is to be
used for long periods during the winter, the water in the
heating system in the heating system must be drained,
otherwise there is a risk of frost damage.
Alternatively the system solution with intermediate exchanger
should be used.
5.2 Adjusting the indoor temperature
The indoor temperature is adjusted by changing the heat pump’s heat
curve, which is the control system’s tool for calculating the heating
demand, the integral value. The integral value is determined by com‐
paring the actual temperature of the heating system's supply line with
the calculated value, the setpoint value.
The heating requirement is calculated from the current outdoor tem‐
perature and heat curve setting.
The heat curve will be adjusted in connection with installation. It must
be adapted later on, however, to obtain a pleasant indoor temperature
in any weather conditions. A correctly set heat curve reduces mainte‐
nance 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 respec‐
User manual 086L0130 Rev. 1 EN – 17

tively. When you increase the CURVE value, the heat curve will
become steeper and when you reduce it, it will become flatter.
This is the most energy and cost efficient way to set the indoor tem‐
perature and should therefore be used for long term temperature set‐
tings.
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 reduced, it will become flatter.
Raise or lower as necessary to obtain as even an indoor tem‐
perature 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.
18 – User manual 086L0130 Rev. 1 EN