Thermia Mega User manual

User Guide
Mega
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 Värmepumpar

Table of Contents
1 Foreword ............................................... 4
2Safety precautions ......................................... 5
2.1 Symbols in documents .................................... 5
2.2 Important information .................................... 5
2.3 Installation and maintenance ................................ 6
2.4 System modifications .................................... 7
2.5 Safety valves ......................................... 7
3About your heat pump ....................................... 8
3.1 Product description ..................................... 8
3.2 Water heater ......................................... 8
4Control system ........................................... 9
4.1 Display description ...................................... 9
5Settings and adjustments ..................................... 10
5.1 Activate functions ...................................... 10
5.2 Selecting operating mode .................................. 10
5.3 Adjusting the indoor temperature ............................. 12
5.4 Distribution circuits ..................................... 15
5.5 Operating data ........................................ 16
6 Default settings in the control unit ............................... 17
7 Regular checks ........................................... 18
7.1 Alarms ............................................. 18
7.2 Checking the brine circuit pressure ............................. 19
7.3 Check the water level in the heating circuit ........................ 20
7.4 Checking safety valves .................................... 20
7.5 In the event of leakage .................................... 20
7.6 Cleaning the filters for the heating and brine circuits .................. 21
8 Checklist ............................................... 22
9 Installation carried out by: .................................... 23
User Guide Mega
Thermia Värmepumpar VUJSC202 3

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
User Guide Mega
VUJSC202 Thermia Värmepumpar
4

2 Safety precautions
2.1 Symbols in documents
The instructions contain different warning symbols, which, together with text, indicate to the user that there
are risks involved with actions to be taken.
The symbols are displayed to the left of the text and three different symbols are used to indicate the degree of
danger:
Danger Indicates an immediate danger that leads to
fatal or serious injury if necessary measures
are not taken.
Warning Risk of personal injury!
Indicates a possible danger that can lead to fa-
tal or serious injury if necessary measures are
not taken.
Caution Risk of installation damage.
Indicates a possible hazard that can lead to
item damage if necessary measures are not
taken.
A fourth symbol is used to give practical information or tips on how to perform a procedure.
N
Information regarding making the handling of
the installation easier or a possible operation-
al technical disadvantage.
2.2 Important information
Warning The front of the heat pump must only be
opened by qualified installers.
User Guide Mega
Thermia Värmepumpar VUJSC202 5

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.
2.3 Installation and maintenance
Warning Only qualified installers may install, operate
and carry out maintenance and repair work on
the heat pump
Warning Only qualified electricians may modify the
electrical installation.
Warning Only qualified refrigeration technicians may
work on the refrigerant circuit
User Guide Mega
VUJSC202 Thermia Värmepumpar
6

2.4 System modifications
Only qualified installers may carry out modifications on the following components:
▪The heat pump unit
▪The pipes for the refrigerant, brine and water
▪The power supply
▪The safety valves
It is not permitted to carry out construction installations that may affect the operational safety of the heat
pump.
2.5 Safety valves
Warning Never block the connection to the safety
valves' overflow pipes.
The following safety precautions apply to the hot water circuit’s safety valve with corresponding overflow 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.
User Guide Mega
Thermia Värmepumpar VUJSC202 7

3 About your heat pump
3.1 Product description
The Mega heat pump is a heating system for heating and, if an external water heater is installed (accessory), for
hot water production. It has a compressor which is customised for heat pumps.
The Mega heat pump is equipped with control equipment which is presented in a graphic display. The control
equipment is also prepared for monitoring via the internet.
Heating is provided to the building via a water-borne heating system. The heat pump supplies as much of the
heat demand as possible before auxiliary heating is engaged to assist.
The Mega heating unit consists of two basic components:
Heat pump unit
The heat pump consists of:
▪Scroll compressor
▪Stainless steel heat exchanger
▪Circulation pumps for collector system and heating system
Control equipment
The control equipment controls the incoming components of the heating appliance (compressor, circulation
pumps, auxiliary heating and exchange valve) and keeps track of when the pump should start and stop, as well
as whether it should produce heating for the building or hot water.
The control equipment consists of:
▪Colour touch screen and relay module
▪Temperature sensors (outdoor, supply line, return line, brine, hot water and hot gas)
3.2 Water heater
The Mega heat pump can also produce hot water for an external water heater. The temperature of the water
supplied to the water heater is controlled by the start and stop temperature.
User Guide Mega
VUJSC202 Thermia Värmepumpar
8

4 Control system
The heat pump has an integrated control system which automatically calculates the heat demand in the build-
ing to ensure that the correct amount of heat is produced and emitted when necessary.
A touch screen is connected to the control system.
The display is used for:
▪making settings such as:
▪setting heating
▪adjusting the heat curve
▪displaying operating data such as:
▪operating time
▪current values of sensors
4.1 Display description
Start screen
The screen which appears when the system is switched on.
Here you can also carry out comfort adjustment:
1. Drag clockwise or anticlockwise to raise or lower the offset. Each point represents an increase/decrease of
1°C
2. Alternatively, press + / -
Menu screen
This screen appears when you have pressed on the start screen.
User Guide Mega
Thermia Värmepumpar VUJSC202 9

5 Settings and adjustments
A qualified installer sets the heat pump's basic settings upon installation. The adjustments that may be made
by the installer/user are described below.
N
Never change control unit settings unless you
are aware of what effects the changes may
have.
Make a note of the default setting.
5.1 Activate functions
N
Functions must be enabled before they can be
activated and used.
Below is an example where the Heating function is activated.
Other functions are activated in a similar way.
1. Press in the upper left corner of the Start screen.
2. Press .
3. Continue with to the menu page to set heating.
4. Press to activate the heating function.
5. Press to return to the Menu screen.
5.2 Selecting operating mode
N
The heat pump has a starting time of about 5 -
10 minutes.
The delay does not apply to the auxiliary oper-
ating mode.
Set the heat pump to the desired operating mode in the menu:
1. Press on the Start screen to open the Menu screen.
2. Press . A new window opens.
3. Press the appropriate symbol for the desired operating mode.
User Guide Mega
VUJSC202 Thermia Värmepumpar
10

Symbol Description
Operating mode Off. All functions off.
Operating mode Standby. All internal functions off.
System pump and other external functions are on.
Operating mode On. All activated functions are on.
In this operating mode, functions selected in Settings can be
switched on or off.
Press to switch functions on/off.
See the example in the table below.
N
The list below shows examples of pre-selected
functions.
Functions must be enabled in Settings before
they can be activated and used.
Symbol Description
Operating mode Heat production. Only if the compressor is in operation.
Press to activate.
Operating mode Hot tap water. Only hot water production is permitted.
Press to activate.
Operating mode Auxiliary heater . Only heat production.
Press to activate.
User Guide Mega
Thermia Värmepumpar VUJSC202 11

5.3 Adjusting the indoor temperature
The heat curve is a graph that compares the outdoor temperature with the supply temperature. The colder the
outdoor temperature is, the more heat is supplied to the heating system. The heat curve is adjusted during
installation. It must however be re-adjusted later to obtain a pleasant indoor temperature in all weather condi-
tions.
For an explanation of the factory pre-set heat curve, see Symbol description below.
At an outdoor temperature of 0°C the supply temperature should be 40°C. Note that this is only a benchmark.
There are radiator systems, floor heating systems and other types of heating system which require either lower
or higher temperatures.
At outdoor temperatures below 0°C, supply line water hotter than 40°C is supplied to the radiators. Supply line
water colder than 40°C is supplied if the outdoor temperature is above 0°C.
A correctly set heat curve reduces the need for maintenance, as well as making operation more energy-effi-
cient.
The indoor temperature is adjusted by changing the heat curve of the heat pump. This curve is the control
system's tool for calculating the correct supply temperature of water for the heating system.
Comfort adjustment
Comfort adjustment involves moving the whole curve upwards or downwards.
1. On the start screen, press on the point marked.
2. Drag clockwise or anticlockwise to raise or lower the offset. Each point represents an increase/decrease of
1°C.
User Guide Mega
VUJSC202 Thermia Värmepumpar
12

Adjusting the heat curve
1. Press on the Start screen to open the Menu screen.
2. Press
3. Press if the Heat curve is not shown.
4. There are two ways of adjusting the heat curve:
▪Press or to adjust the entire curve.
Or:
▪individual points can be moved separately either :
▪by pressing one of the individual points on the curve
and dragging the point upwards or downwards to
the desired radiator temperature
▪or by pressing / marking one of the points on the
curve and pressing and to the desired ra-
diator temperature.
5. Confirm the new selection by pressing
Heating settings
In Heating settings, you can set heat stop and min/max supply temperature.
Heat stop is at which outdoor temperature the heat production is shut off.
1. Press on the Start screen to open the Menu screen.
2. Press
3. Press if the Heat settings window is not shown.
4. Make the desired changes.
5. Confirm settings by pressing
User Guide Mega
Thermia Värmepumpar VUJSC202 13

Symbol description
Fig. 1: The figure shows the standard curve 40
Symbol description
+2 Shows when the curve is comfort-adjusted. The digit shows how much.
Shows that the heat curve window is inactive. Press on the symbol to open
heat curve settings.
Shows that the heat curve window is active. This window is the default win-
dow.
Shows that the heating settings window is inactive. Press on the symbol to
open heating settings.
Shows that the heating settings window is active.
8°C
Shows the current outdoor temperature.
40˚C
Shows the current supply temperature.
Press to download and upload a previously saved setting.
Press to save the current setting.
NB The setting must first be confirmed by pressing
Press to reset to factory settings.
Press to move individual points or the whole curve upwards.
Press to move individual points or the whole curve downwards.
User Guide Mega
VUJSC202 Thermia Värmepumpar
14

5.4 Distribution circuits
Distribution circuit 1 is available from factory. Distribution circuits 2-5 require an expansion module, EM-1, sep-
arately sold as accessory.
Up to 5 distribution circuits can be active simultaneously.
Example of settings for distribution circuit 1:
1. Press in the upper left corner of the Start screen
2. Press
3. Press the text Mix valves.
4. Press text for desired distribution circuit.
Each distribution circuit has 2 pages of settings.
5. Page 1:
Settings for supply temperature at different outdoor temperatures.
NOTE! The distribution circuit settings must not exceed the values set in the main heat curve.
The temperature can be adjusted in two ways:
▪Press or to adjust the entire curve.
▪Press and drag individual curve points:
▪Press one of the individual points on the curve and drag the point upwards or downwards to
the desired temperature
▪OR press / mark one of the points on the curve and press and to the desired tem-
perature.
If a value which lies outside the main heat curve is set, this is shown by a change of colour. See 51 in the
curve above.
Confirm the settings with
6. Page 2:
Settings for max/min supply temperature.
NOTE! The distribution circuit settings must not exceed the values set in the main heat curve.
Confirm the settings with
User Guide Mega
Thermia Värmepumpar VUJSC202 15

5.5 Operating data
Check applicable sensors described in the table below. The sensors can be found in the sub-menu Operating
data
Select Operating data on the Menu screen:
1. Press on the Start screen to open the Menu screen.
2. Press Operating data
3. Select sensor on the different menu pages.
Sensor Explanation
Outdoor Shows the temperature on the outdoor sensor.
Calculated demand Shows heating surplus or heating deficit in the heating system.
Minus value indicates heating deficit.
System supply line Shows the temperature on the system supply line.
Desired system supply line Shows the current system requirement value.
Hot water Shows the temperature of the hot water sensor, if hot water production is
permitted.
Condenser out Shows temperature of outgoing radiator temperature from heat pump.
Condenser in Shows temperature of incoming radiator temperature to heat pump.
Brine in Shows the current temperature of brine in to the heat pump.
Brine out Shows the current temperature of brine out from the heat pump.
Compressor run time Shows the number of hours that the compressor has been in operation.
Tap water run time Shows the number of hours that has been used for hot water production.
External heater run time Shows the number of hours that the external heater has been activated.
Version information
On page 3 in the Operating data, version information about the control system software is shown.
This information is useful when contacting support.
User Guide Mega
VUJSC202 Thermia Värmepumpar
16

6 Default settings in the control unit
The left column in the table below shows the parameters that can be adjusted by the user.
The middle column shows the factory settings.
The right column shows the settings made by the installer when the heat pump was installed
Parameter Factory setting Any customer-specific settings
Heat curve 40°C
Operating mode Off
Min desired system
supply temp. 10°C
Max desired system
supply temp. 55°C
Heat stop 17°C
User Guide Mega
Thermia Värmepumpar VUJSC202 17

7 Regular checks
7.1 Alarms
There are three types of alarm:
▪Class A: Stops the heat pump. The alarm must be acknowledged.
▪Class B: Does not stop the heat pump. The alarm must be acknowledged.
▪Class C: Does not stop the heat pump. The alarm is self-acknowledging.
If an event triggers a class A or B alarm, the display shows a continuous red light.
Press the screen, and the following window will appear:
Fig. 2: Start screen with alarm
Press A new window opens, showing the alarm which has been triggered.
User Guide Mega
VUJSC202 Thermia Värmepumpar
18

Fig. 3: Alarm example
Acknowledging alarms
Press to reset all alarms.
7.2 Checking the brine circuit pressure
The brine circuit must be filled with the correct amount of fluid; otherwise the installation may become dam-
aged. Ensure that the system has the necessary pressure, but not above the maximum pressure of 6 bar.
For filling brine, see the commissioning guide.
1
2
1 Used when filling
2 Connected to brine circuit
User Guide Mega
Thermia Värmepumpar VUJSC202 19

7.3 Check the water level in the heating circuit
The system pressure of the installation must be checked at least twice per year. Ensure that the heating system
has the necessary pressure, but max 6 bar.
You can use normal tap water when topping up the heating system. In certain exceptional cases the water
quality may be unsuitable for filling the heating system (corrosive or calciferous water).
In case of doubt, contact your installer.
Do not use any additives for treatment of the water in the heating system!
7.4 Checking safety valves
The safety valves for the installation must be checked at least four times a year to prevent lime deposits clog-
ging the mechanism.
The safety valve of the water tank protects the enclosed heater against over pressure. It is mounted on the cold
water inlet line. If the safety valve is not checked regularly, there is a risk that the water tank may sustain dam-
age. It is quite normal for the safety valve to let out small amounts of water when the water tank is being charg-
ed, especially if a lot of hot water was used previously.
The safety valves can be checked by turning the cap a quarter of a turn clockwise until water comes out of the
overflow pipe. If a safety valve does not work properly, it must be replaced. Contact your installer.
The opening pressure of the safety valves is not adjustable.
7.5 In the event of leakage
In the event of leakage in the hot water pipes between the heat pump and water taps, close the shut-off valve
on the cold water inlet immediately. Then contact your installer.
In the event of leakage in the brine circuit, turn off the heat pump and call your installer immediately.
User Guide Mega
VUJSC202 Thermia Värmepumpar
20