Nibe F1255 Series User Manual
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Nibe F1255 Series User Manual

Ground source heat pump
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UHB EN 2008-9
231530
Ground source heat pump
NIBE F1255
USER MANUAL

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rainer wiest
July 1, 2025

how to fix failure nr 52

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Summary of Contents for Nibe F1255 Series

  • Page 1 UHB EN 2008-9 USER MANUAL 231530 Ground source heat pump NIBE F1255...
  • Page 2 Quick guide Navigation Ok button (confirm/select) Back button (back/undo/exit) Control knob (move/increase/reduce) A detailed explanation of the button functions can be found on page How to scroll through menus and make different settings is described on page Set the indoor climate INDOOR CLIMATE HOT WATER HEAT PUMP...

  • Page 3: Table Of Contents

    3 F1255 – at your service Set the indoor climate Set the hot water capacity Get information Adjust the heat pump 4 Disturbances in comfort Manage alarm Troubleshooting Only additional heat 5 Technical data 6 Glossary Item register Contact information NIBE F1255 Table of Contents...

  • Page 4: Important Information

    1.9.1.1 heating curve (curve slope) Serial number must always be given Certification that the installation is carried out according to instructions in the accompanying installer manual and applicable regulations. Date __________________ Signed _________________________ Chapter 1 | Important information NIBE F1255...

  • Page 5: Safety Information

    Do not start F1255 if there is a risk that the water in the system has frozen. If the supply cable is damaged, only NIBE, its service representative or similar authorised person may replace it to prevent any danger and damage.

  • Page 6: Marking

    Read the User Manual. Serial number The serial number can be found at the bottom right of the front cover, in the info menu (menu 3.1) and on the type plate . Serial number Chapter 1 | Important information NIBE F1255...
  • Page 7 Caution You need the product's ((14 digit) serial number for servicing and support. NIBE F1255 Chapter 1 | Important information...

  • Page 8: F1255 - An Excellent Choice

    EXCELLENT PROPERTIES FOR F1255: • Inverter controlled compressor The heat pump has an inverter-controlled compressor that automatically adapts itself optimally and economically to your house and supplies your installation with heating and hot water. Chapter 1 | Important information NIBE F1255...
  • Page 9 The heat pump has a large display with easy-to-understand menus that facilitate setting a comfortable climate. • Simple troubleshooting In the event of a fault, the heat pump display shows what happened and the actions to be taken. NIBE F1255 Chapter 1 | Important information...

  • Page 10: The Heat Pump - The Heart Of The House

    -4 ºC Evaporator -2 ºC -3 ºC 0 ºC Brine Heat source The temperatures are only examples and may vary between different installations and time of year. Chapter 2 | The heat pump – the heart of the house NIBE F1255...

  • Page 11: Heat Pump Function

    Heat medium circuit The heating energy that the refrigerant releases in the condenser is re- trieved by the heat pump's boiler section. NIBE F1255 Chapter 2 | The heat pump – the heart of the house...

  • Page 12: Contact With F1255

    Alarm management is described on page 76. Chapter 2 | The heat pump – the heart of the house NIBE F1255...
  • Page 13 The status lamp indicates the status of the heat pump. It: • lights green during normal operation. • lights yellow in emergency mode. • lights red in the event of a deployed alarm. NIBE F1255 Chapter 2 | The heat pump – the heart of the house...
  • Page 14 The USB port is used to update the software. Visit nibeuplink.com and click the "Software" tab to download the latest software for your installation. Chapter 2 | The heat pump – the heart of the house NIBE F1255...
  • Page 15 If the heat pump is set as slave a limited main menu is displayed because the majority of the settings for the system are made at the master heat pump. NIBE F1255 Chapter 2 | The heat pump – the heart of the house...
  • Page 16 This menu is also set in the slave heat pump's limited menu system. HEAT PUMP Menu 4 Setting time, date, language, display, operating mode etc. See page Chapter 2 | The heat pump – the heart of the house NIBE F1255...
  • Page 17 This symbol indicates whether "holiday setting" is active in 4.7. This symbol indicates whether F1255 has contact with NIBE Uplink. This symbol indicates the actual speed of the fan if the speed has changed from the normal setting.
  • Page 18 OK button. A new window then opens with sub menus. Select one of the sub menus by marking it and then pressing the OK button. Chapter 2 | The heat pump – the heart of the house NIBE F1255...
  • Page 19 Mark the applicable option. One of the options is pre-selected (white). Press the OK button to confirm the selected option. The selec- ted option has a green tick. NIBE F1255 Chapter 2 | The heat pump – the heart of the house...
  • Page 20 Press the OK button to confirm the value you have set. To change and return to the original value, press the Back button. Chapter 2 | The heat pump – the heart of the house NIBE F1255...
  • Page 21 Back button. If a menu only has one character set the keyboard is displayed directly. When you have finished writing, mark "OK” and press the OK button. NIBE F1255 Chapter 2 | The heat pump – the heart of the house...
  • Page 22 Use the control knob to select the help symbol. Press the OK button. The help text often consists of several windows that you can scroll between using the control knob. Chapter 2 | The heat pump – the heart of the house NIBE F1255...

  • Page 23: Maintenance Of F1255

    The function of the safety valve must be checked regularly. Perform checks as follows: Open the valve. Check that water is flowing through it. NIBE F1255 Chapter 2 | The heat pump – the heart of the house...

  • Page 24: Saving Tips

    Energiförbrukning fördelat över året the year. consumption April June July mars april juni juli Månad Month Increasing the indoor temperature one degree increases the energy consumption by approx. 5%. Chapter 2 | The heat pump – the heart of the house NIBE F1255...
  • Page 25 Engine block heater (Operation: 1 h/day, 4 months a year) Passenger compartment heater (Opera- tion: 1 h/day, 4 months a year) These values are approximate example values. NIBE F1255 Chapter 2 | The heat pump – the heart of the house...
  • Page 26 Chapter 2 | The heat pump – the heart of the house NIBE F1255...

  • Page 27: F1255 - At Your Service

    " off". advanced Setting of heat curve, adjusting with external contact, minim- um value for supply temperature, room sensor, cooling function and +Adjust. NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 28 The display shows the set values for heating (curve offset). To raise or lower the indoor temperature, increase or reduce the value on the display. Use the control knob to set a new value. Confirm the new setting by pressing Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 29 Setting range: normal and speed 1-4 Default value: normal normal(50%) speed 1 (0%) speed 2 (40%) speed 3 (80%) speed 4 (100%) The ventilation in the accommodation can be temporarily increased or reduced NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 30 Time period: The start and stop time for the selected day for scheduling are se- lected here. Adjusting: See relevant sub menu. Conflict: If two settings conflict with each other, a red exclamation mark is dis- played. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 31 Changes of temperature in accommodation take time. For example, short time periods in combination with underfloor heating will not give a noticeable difference in room temperature. COOLING (ACCESSORY REQUIRED) Menu 1.3.2 NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 32 Setting the heat cooling settings curve offset when the external contact is connected. fan return time min. flow line temp. Setting minimum Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 33 Default value: 9 flow temperature °C cooling curve (accessory required) Setting range: 0 – 9 Default value: 0 outdoor temp. °C cooling curve 1.9.1.2 system flow temperature °C outdoor temp. °C NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 34 If it is warm outdoors and the room temperature is too low, increase the curve offset by one increment. If it is warm outdoors and the room temperature is too high, lower the curve offset by one increment. EXTERNAL ADJUSTMENT Menu 1.9.2 Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 35 3 °C climate system 4 °C In menu 1.9.3 you select heating or cooling, in the next menu (min. supply temp.heating/cooling) set the minimum temperature on the supply temperature NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 36 A higher value gives a greater and faster change of the heating curve's set offset. NOTE Too high a set value for "factor system" can (depending on your climate system) produce an unstable room temperature. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 37 Setting range: 0.5 - 10.0 °C Default value: 1.0 cool at room over temp. Setting range: 0.5 - 10.0 °C Default value: 3.0 larm rumsgivare kyla Setting range: on/off Factory setting: off NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 38 Caution When the heating/cooling sensors BT74 have been connected and activated in menu 5.4, no other sensor can be selected in menu 1.9.5. set pt value cool/heat sensor Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 39 This selection is only available when cooling in 2-pipe systems. Here you can set how long F1255 is to wait before it returns to heating mode when the cooling demand has ceased or vice versa. NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 40 30 °C °C flow line temp. at 40 °C °C When required, create your own heating or cooling curve here, by setting the desired supply temperatures for different outdoor temperatures. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 41 "-2" and "change in curve" is increased until the desired room temperature is maintained. Caution Wait 24 hours before making a new setting, so that the room temper- ature has time to stabilise. NIGHT COOLING (ACCESSORY REQUIRED) Menu 1.9.9 NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 42 1 Using +Adjust, the installation communicates with the underfloor heating’s control centre* and adjusts the heating curve as well as the calculated supply temperature according to the underfloor heating system. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 43 + cool at room over temp.. FLM cooling stops when the room temperature falls below room set point value. If you have several FLM systems, you can set these values for each of them. NIBE F1255 Chapter 3 | F1255 – at your service...

  • Page 44: Set The Hot Water Capacity

    (when the holiday function is prioritised), "active" appears if any part of scheduling is active, otherwise "off" appears. advanced Setting periodic increase in the hot water temperature. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 45 Default value: normal economy normal luxury The difference between the selectable modes is the temperature of the hot tap water. Higher temperature means that the hot water lasts longer. NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 46 Adjustment: Set the hot water comfort that is to apply during scheduling here. Conflict: If two settings conflict with each other, a red exclamation mark is dis- played. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 47 The length of time between increases can be selected here. The time can be set between 1 and 90 days. Factory setting is 14 days. Tick/untick "activated" to NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 48 "operating time" decide how long the hot water circulation pump must run per operating instance. "downtime" decide how long the hot water circulation pump must be stationary between operating instances. Hot water circulation is activated in menu 5.4 "soft inputs and outputs". Chapter 3 | F1255 – at your service NIBE F1255...

  • Page 49: Get Information

    NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 50 The information is on several pages. Turn status: runs the control knob to scroll between the number of starts: pages. 1 hrs total operating time: - of which hot water: 0 hrs ADD. HEAT INFO Menu Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 51 25.0 °C hot water charging 49.0 °C 6.2 °C brine in brine out 3.9 °C 30.5 °C condenser out 0 min operating time op. mode heating Information about an alarm. Menu NIBE F1255 Chapter 3 | F1255 – at your service...

  • Page 52: Adjust The Heat Pump

    The average outdoor temperature is only shown if a room temperature sensor/room unit is installed. When an exhaust air module (NIBE FLM) week is installed, the exhaust air temperature is shown. To read off an average temperature Turn the control knob so that the ring on the shaft with the week number is marked.
  • Page 53 "active" is displayed if any part of the va- cation schedule is active, otherwise it displays " off". advanced Setting heat pump work mode. NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 54 F1255 starts pool heating. Untick "activated" to switch off the pool heating. Caution The start temperature cannot be set to a value that is higher than the stop temperature. INTERNET Menu Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 55 Request new connection string To connect a user account on NIBE Uplink to your installation, you must request a unique connection code. Mark “request new connection string" and press the OK button. The installation now communicates with NIBE Uplink to create a connection code.
  • Page 56 NOTE After disconnecting all users none of them can monitor or control your installation via NIBE Uplink without requesting a new connection string. TCP/IP SETTINGS Menu 4.1.3.8 You can set TCP/IP settings for your in- tcp/ip settings4.1.3.8 stallation here. Automatic setting (DHCP)
  • Page 57 +46 XXXXXXXX. If you want to receive an SMS message in the event of the alarm mark the box to the right of the telephone number. NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 58 With over capacity mode on "SG Ready" and cooling operation, the parallel offset for the indoor temperature is reduced by "-1". If a room sensor is installed and activated, the desired room temperature is instead reduced by 1 °C. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 59 Smart price adaption™ and you have area an activated NIBE Uplink account. affect room temperature affect hot water area Here you select where (which zone) the heat pump is set-up. Contact your electricity supplier to find out which zone digit to enter.
  • Page 60 The function is based on hourly rates for the next 24 hours being retrieved via NIBE Uplink and therefore an internet connection and an account for NIBE Uplink are required.
  • Page 61 When you have a smart home system smart home 4.1.7 that can speak to NIBE Uplink, by activat- ing the smart home function in this menu you can control the F1255 via an app. smart home By allowing connected units to commu- nicate with NIBE Uplink, your heating control system.
  • Page 62 4.1.8.1 smart energy source™ Setting range: Off/On Factory setting: Off smart energy source control method control method Setting range: Price / CO Factory setting: Price SET. PRICE Menu 4.1.8.2 Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 63 Spot price can only be used if you have an hourly tariff agreement with your electricity supplier. *The currency varies depending on the country selected. CO2 IMPACT Menu 4.1.8.3 NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 64 (Monday to Friday) or four period different periods on weekends (Sat- period urdays and Sundays). TARIFF PERIODS, FIXED PRICE Menu 4.1.8.5 Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 65 (Monday to Friday) or four period different periods on weekends (Sat- period urdays and Sundays). TARIFF PERIODS, OPT10 Menu 4.1.8.8 NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 66 (Monday to Friday) or four period different periods on weekends (Sat- period urdays and Sundays). Menu 4.1.10 Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 67 For EME 20, you can select whether you want domestic electricity to be priorit- ised ahead of room temperature and hot water, provided that F1255 is equipped with an external energy meter. OP. MODE Menu NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 68 You cannot deselect "compressor" in manual mode. "addition" is the unit that helps the compressor to heat the home and/or the hot water when it cannot manage the entire requirement alone. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 69 12 h date Time and date are set automat- month ically if the heat pump is con- year nected to NIBE Uplink. To ob- tain the correct time, the time zone must be set. LANGUAGE Menu NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 70 Set the vacation setting in advance and activate just before departure in order to maintain the comfort. ADVANCED Menu Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 71 The indicator marks where in the cycle the heat pump is. If 0 minutes is selected, this means that the requirement is not prioritised, but will only be activated when there is no other requirement. AUTO MODE SETTING Menu 4.9.2 NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 72 In systems where heating and cooling share the same pipes "stop heating" cannot be set higher than "start cooling" if there is not a cool- ing/heating sensor. DEGREE MINUTE SETTING Menu 4.9.3 Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 73 Do you want to reset all user settings to factory settings? Caution After factory setting, personal settings such as heating curves must be reset. SCHEDULE BLOCKING Menu 4.9.5 NIBE F1255 Chapter 3 | F1255 – at your service...
  • Page 74 Set the stop time earlier than the start time so that the period extends beyond midnight. Scheduling then stops at the set stop time the day after. Scheduling always starts on the date that the start time is set for. Chapter 3 | F1255 – at your service NIBE F1255...
  • Page 75 Caution Long term blocking can cause reduced comfort and operating economy. NIBE F1255 Chapter 3 | F1255 – at your service...

  • Page 76: Disturbances In Comfort

    “alarm” is visible in the display, the problem causing the alarm still remains. If the alarm initially disappears and then returns, you should contact your installer. Chapter 4 | Disturbances in comfort NIBE F1255...

  • Page 77: Troubleshooting

    • The property's earth circuit breaker. • Correctly set load monitor (if current sensors installed). LOW HOT WATER TEMPERATURE OR NO HOT WATER • Mixing valve (if there is one installed) set too low. NIBE F1255 Chapter 4 | Disturbances in comfort...
  • Page 78 – Enter menu 4.2. If mode "auto" is selected, select a higher value on "stop heating" in menu 4.9.2. – If mode "manual" is selected, select "heating". If this is not enough, select "addition". • Too low or no operating prioritisation of heat. Chapter 4 | Disturbances in comfort NIBE F1255...
  • Page 79 • Incorrectly set heating curve. – Fine-tune the heating curve in menu 1.9.1 • Too high set value on "dT at DOT".. – Contact your installer! • Uneven flow over the radiators. – Contact your installer! NIBE F1255 Chapter 4 | Disturbances in comfort...
  • Page 80 • Uneven flow over the radiators. – Contact your installer! GURGLING SOUND This part of the troubleshooting chapter only applies if the NIBE FLM accessory is installed. • Not enough water in the water seal. – Refill the water seal with water.

  • Page 81: Only Additional Heat

    SET THE HEAT PUMP TO ADDITIONAL HEAT MODE Go to menu 4.2 "op. mode". Mark ”add. heat only” using the control knob and then press the OK button. Return to the main menus by pressing the Back button. NIBE F1255 Chapter 4 | Disturbances in comfort...

  • Page 82: Technical Data

    5 Technical data Detailed technical specifications for this product can be found in the in- stallation manual (nibe.eu). Chapter 5 | Technical data NIBE F1255...

  • Page 83: Glossary

    The building is cooled or heated using radiators, under floor coils or convector fans. COIL TANK A heater with a coil in it. The water in the coil heats the water in the heater. NIBE F1255 Chapter 6 | Glossary...
  • Page 84 In most cases, the heat pump notes operational interference and indicates this with alarms and shows instructions in the display. DOMESTIC HOT WATER The water one showers in for example. Chapter 6 | Glossary NIBE F1255...
  • Page 85 FAN CONVECTORS A type of convector, but with auxiliary fan that blows hot or cold air into the accommodation. FILTERING TIME Indicates the time the average outdoor temperature is calculated on. NIBE F1255 Chapter 6 | Glossary...
  • Page 86 MIXING VALVE A valve that mixes the cold water with the hot water leaving the heater. Chapter 6 | Glossary NIBE F1255...
  • Page 87 A sensor that is located indoors. This sensor tells the heat pump how hot it is indoors. SAFETY VALVE A valve that opens and releases a small amount of liquid if the pressure is too high. NIBE F1255 Chapter 6 | Glossary...
  • Page 88 SUPPLY TEMPERATURE The temperature of the heated water that the heat pump sends out to the heating system. The colder the outdoor temperature, the higher the supply line temperature becomes. Chapter 6 | Glossary NIBE F1255...

  • Page 89: Item Register

    Menu system, 15 Help menu, 22 External information, 12 Operation, 18 Information window, 12 Scroll through the windows, 22 Status lamp, 12 Selecting menu, 18 Selecting options, 19 Setting a value, 20 F1255 – An excellent choice, 8 NIBE F1255 Item register...
  • Page 90 Set the indoor climate, 27 Setting a value, 20 Status lamp, 12–13 Switch, 14 Symbols, 5 Technical data, 82 The heat pump – the heart of the house, 10 Troubleshooting, 77 Use the virtual keyboard, 21 Item register NIBE F1255...

  • Page 91: Contact Information

    Tel: +7 831 419 57 06 E-mail: kuzmin@evan.ru www.nibe-evan.ru NIBE AB Sweden, Box 14, Hannabadsvägen 5, SE-285 21 Markaryd Tel: +46 (0)433 27 3000 E-mail: info@nibe.se www.nibe.se For countries not mention in this list, please contact Nibe Sweden or check www.nibe.eu for more information.
  • Page 92 WS release date: 2020-03-02 10:13 Publish date: 2020-04-14 15:08 This manual is a publication from NIBE Energy Systems. All product illustrations, facts and data are based on the available information at the time of the publica- tion’s approval. NIBE Energy Systems makes reservations for any factual or printing errors in this manual.

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F1255-6F1255-12F1255-16

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