NIBE S2125 Water Heat Pump User Manual
- September 13, 2024
- NIBE
Table of Contents
NIBE S2125 Water Heat Pump
Symbols
Explanation of symbols that may be present in this manual.
CAUTION!
This symbol indicates danger to person or machine.
NOTE!
This symbol indicates important information about what you should observe when maintaining your installation.
TIP!
This symbol indicates tips on how to facilitate using the product.
Serial number
The serial number can be found on the rear cover and at the bottom on the side.
NOTE!
You need the product’s (14 digit) serial number for servicing and support.
Installation function
An air/water heat pump installation uses the outdoor air to heat up a home. The conversion of the outdoor air’s energy into residential heating occurs in three different circuits. From the outdoor air, (1) , free heat energy is retrieved and transported to the heat pump. The heat pump increases the retrieved heat’s low temperature to a high temperature in the refrigerant circuit, (2) . The heat is distributed around the building in the heating medium circuit, (3) .
The temperatures are only examples and may vary between different installations and time of year.
Outdoor air
- A The outdoor air is drawn into the outdoor unit.
- B The fan then routes the air to the outdoor unit’s evaporator. Here, the air releases thermal energy to the refrigerant and the air’s temperature drops. The cold air is then blown out of the outdoor unit.
Refrigerant circuit
-
C In a closed system in the outdoor unit, a gas (a refrigerant) circulates, which also passes the evaporator. The refrigerant has a very low boiling point. In the evaporator, the refrigerant collects the heat energy from the outdoor air and starts to boil.
-
D The gas that is produced during boiling is routed into an
electrically powered compressor. When the gas is compressed, the pressure increases and the gas’s temperature increases considerably, from 0 °C to approx 80 °C. -
E From the compressor, gas is forced into a heat exchanger, condenser, where it releases heat energy to the indoor module, whereupon the gas is cooled and condenses to a liquid form again.
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F As the pressure is still high, the refrigerant can pass an expansion valve, where the pressure drops so that the refrigerant returns to its original temperature. The refrigerant has now completed a full cycle. It is routed to the evaporator again and the process is repeated.
Heat medium circuit
- G The heat energy that the refrigerant produces in the condenser is retrieved by the indoor unit’s heating medium, water, which is heated to approx. 55 °C (supply temperature).
- H The heating medium circulates in a closed system and transports the heated water’s heat energy to the house radiators/heating coils.
- I The indoor module’s integrated charge coil is placed in the boiler section. The water in the coil heats up the surrounding domestic hot water.
Control of S2125
S2125 is controlled in different ways, depending on your system. You control
the heat pump via your indoor module or control module.
See the Installer Manual for the indoor module/control module.
During installation, the installation engineer adjusts the necessary settings
for the heat pump in the indoor module or control module, so that the heat
pump works optimally in your system.
Maintenance of S2125
Regular checks
When your heat pump is located outdoors some external maintenance is required.
CAUTION!
Insufficient maintenance can cause serious damage to S2125, which is not covered by the guarantee.
CHECKING GRILLES AND BOTTOM PANEL ON S2125
- Check regularly throughout the year that the grille is not clogged by leaves, snow or anything else.
- You should be particularly vigilant during windy conditions and/or in the event of snow, as the grille can become blocked.
- Check that the back is free from dirt and leaves.
- Also check that the drain holes in the bottom panel are free from dirt and leaves.
- Regularly check that condensation is routed away correctly through the condensation pipe. Ask your installer for assistance if required.
Keep free of snow and ice
Prevent snow from building up and covering the grilles and drain holes on S2125.
Keep free of snow and/or ice.
CLEANING THE OUTER CASING
If necessary the outer casing can be cleaned using a damp cloth.
Care must be exercised so that the heat pump is not scratched when cleaning. Avoid spraying water into the grilles or the sides so that water penetrates into S2125. Prevent S2125 coming into contact with alkaline cleaning agents.
ACTUATING THE SAFETY VALVE (FL2)
The safety valve must be actuated regularly, to remove dirt and to check that it is not blocked.
Remember to also check that the vent valve is working.
In event of long power cuts
In the event of prolonged power failure, we recommend draining the part of the
heating system located outdoors.
This is made easier if shut-off valves are installed. Ask your installer if
you are uncertain.
NOTE!
Also disconnect the non-return valve (RM1.2) to prevent the condenser from freezing.
Silent mode
The heat pump can be set to “Silent mode”, which reduces the heat pump’s noise level. This function can help when S2125 has to be placed in noise-sensitive areas. The function should only be used for limited periods, because S2125 might not reach its dimensioned power.
Fan de-icing
VVM S / SMO S
Menu 4.11.3 – Fan de-icing
VVM / SMO
Menu 4.9.7 – tools
FAN DE-ICING
Setting range: off/on
CONTINUOUS FAN DE-ICING
Setting range: off/on
Fan de-icing: Here, you set whether the “fan de-icing” function will be
activated during the next “active defrosting”.
This can be activated if ice/snow sticks to the fan, grille or fan cone, which
may be noticed due to abnormal fan noise from the outdoor unit.
“Fan de-icing” means that the fan, grille and fan cone are heated using hot air from the evaporator (EP1).
Continuous fan de-icing: There is the option to set recurring de-icing. In this case, every tenth defrosting will be “Fan de-icing”. (This can increase annual energy consumption.)
Updating the software
Information about updating software can be found in the Installer Manual for your indoor module or control module.
Disturbances in Comfort
In most cases, the indoor module/control module notes a malfunction (a malfunction can lead to disturbance in comfort) and indicates this with alarms and action instructions in the display.
CAUTION!
Work behind covers secured by screws may only be carried out by, or under the supervision of, a qualified installation engineer.
Troubleshooting
If the operational interference is not shown in the display
the following tips can be used:
BASIC ACTIONS
Start by checking the following:
- All supply cables to the heat pump are connected.
- Group and main fuses of the accommodation.
- The property’s earth circuit breaker.
- The heat pump’s fuse / automatic protection.
- The indoor module’s/control module’s fuses.
- The indoor module’s/control module’s temperature limiters.
- That S2125 does not have any external damage.
ICE BUILD-UP IN THE FAN, GRILLE AND/OR FAN CONE
Set the “Fan de-icing” function in the indoor module/control module. For more information, see the section “Control –Heat pump EB101” in the Installer Manual.
If problems arise, contact your installer.
WATER BELOW S2125 (LARGER AMOUNT)
- Fit accessory KVR to divert condensation from the air/water heat pump.
- Check that the water drainage via the condensation pipe (KVR) is working.
Contact Information
AUSTRIA
KNV Energietechnik GmbH Gahberggasse 11, 4861 Schörfling
Tel: +43 (0)7662 8963-0
mail@knv.at
knv.at
GERMANY
NIBE Systemtechnik GmbH Am Reiherpfahl 3, 29223 Celle
Tel: +49 (0)5141 75 46 -0
info@nibe.de
nibe.de
NORWAY
ABK-Qviller AS Brobekkveien 80, 0582 Oslo
Tel: (+47) 23 17 05 20
post@abkqviller.no
nibe.no
For countries not mentioned in this list, contact NIBE Sweden or check nibe.eu for more information.
NIBE Energy Systems Hannabadsvägen 5
Box 14
SE-285 21 Markaryd
info@nibe.se
nibe.eu
This is a publication from NIBE Energy Systems. All product illustrations,
facts and data are based on the available information at the time of the
publication’s approval.
NIBE Energy Systems makes reservations for any factual or printing errors in
this publication.
©2024 NIBE ENERGY SYSTEMS 731849
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