Installer manual
Contents
1. Blue Brown I I E nl Be eG W OYND ZZV e solAald z 5 0514 S s lt 6 El s 1 AZL Pr Y nl 8 ZS E 1 NOA HOLM I x 9 LERE _ Ex V 9 B z B E i 3 a oi 4 woa i I N t I SUM V l nx B 3 ang ET A UMOJg E 5 Y Di HUM 13319 UNO t He eee N Hi HEIE 9c uoi Jeaiunuiuo E 9 SX ana ji 145 s X 1 UNOJg ov VL pu 3d wer E E ix dd ZHOS JVAOEZ ee a E 3 sw 3 u Eu 3 8 L 9 S 7 4 SAM 40 Chapter 9 Technical data 24 10 Item register Item register A Accessories 21 Adjusting ventilation 14 Alarm 19 Assembly 5 Commissioning and adjusting 16 Connecting to heating medium system 16 Preparations 16 Start up and inspection 16 Connecting to heating medium system 16 Contact information 4 D Delivery and handling 5 Removing the covers 5 Dimensions and pipe connections 9 Dimensions and setting out coordinates 22 Disturbances in comfort 19 Ala2. W Flow line temperature 35 C 4800 o 4600 600 l h DUT 30 C 4400 4200 200 l h DUT 30 C 4000 600 l h DUT 20 C 3800 3600 R 3400 200 h DUT 20 C 3200 600 I h DUT 10 C 3000 75 Vh DUT 30 C 2800 200 l h DUT 10 C 2600 2400 5 2200 E S 75 l h DUT 10 C 2000 1800 1600 1400 Supply air flow 1200 100 125 150 175 200 225 250 m3 h 30 40 50 60 70 1 9 Power output i S W Flow line temperature 45 C 5400 600 l h DUT 30 C 5200 5000 4800 200 l h DUT 30 C 4600 600 l h DUT 20 C 4400 1 200 l h DUT 20 C dn 600 I h DUT 10 C 3600 3400 75 I h DUT 30 C 200 l h DUT 10 C 3200 75 I h DUT 20 C 3000 2800 2600 75 h DUT 10 C 2400 2200 2000 1800 1600 Supply air flow 1400 100 125 150 175 200 225 250 m3 h 30 40 50 60 70 1 5 SAM 40 Chapter 4 Pipe and ventilation connections 11 12 Power output w Flow line temperature 55 C 6200 6000 600 5800 5600 600 5400 5200 200 5000 4800 200 4600 600 4400 4200 4000 3800 3600 3400 3200 3000 2800 2600 2400 2200 2000 1800 1600 100 125 150 30 40 Chapter 4 Pipe and ventilation connections 175 50 200 60 225 200 l h DUT 75 l h DUT 20 C h DUT hD hD cc h DU h DUT 250 m3 h
3. NIBE Installer manual SAM 40 Supply air module IHB GB 1513 3 031934 Table of Contents 1 Important information Safety information 2 Delivery and handling Transport Assembly Removing the covers 3 The design of the supply air mod ule 4 Pipe and ventilation connections _ General pipe connections Symbol key Outline diagram Dimensions and pipe connections Mounting Heating medium side General ventilation connection Ventilation flow Adjusting ventilation NON o vu u WA oo oo 00 14 14 14 Index Electrical connections General Connections Commissioning and adjusting Preparations Connecting to heating medium system Start up and inspection Disturbances in comfort Info menu F750 Manage alarm Troubleshooting Accessories Technical data Dimensions and setting out coordinates Technical specifications Electrical circuit diagram 15 15 15 16 16 16 19 19 19 19 21 22 22 23 24 25 Table of Contents 1 Important information Safety information This manual describes installation and service proced ures for implementation by specialists This appliance can be used by children aged from 8 years and above and per sons with reduced physical sensory or mental capabilities or lack of experience and knowledge ifthey have been given supervision
4. Pipe and ventilation connections Heating medium side A water borne climate system with a volume of at least 20 litres of circulating water must be present for install ation of SAM 40 to be possible For the correct function of SAM 40 the total volume of the climate system ex cluding the internal volume in F750 must exceed 40 litres of circulating water This means that if the volume of the climate system does not exceed 40 litres of circu lating water installation of volume vessel NIBE UKV is necessary Dimensioning the system 1 Work from the water temperature at DUT DVUT 2 Work from the current supply air flow 3 Work from the desired supply air temperature then calculate the output that SAM 40 must give at DUT 4 Determine the water flow across SAM 40 from the correct output diagram NOTE For supply temper atures that are not in one of the diagrams an es timate linear interpolation can be carried out 5 Work from the projected pressure drop at the projected flow in the water borne system climate system 1 6 Check in the pressure drop diagram that the working point is inside the grey working area 7 Check that the pump capacity from F750 is suffi cient for both the heating system and SAM 40 SAM 40 Output transfer to the supply air Power output
5. 40 is mounted free standing on brackets altern atively above a VPB 200 For VPB 300 VPBS 300 install ation is with the help of brackets Noise from the fan can be transferred to the brackets Install the brackets to an outside wall ideally in a room where noise does not matter in order to elim inate noise problems If this is not possible avoid placing it against a wall behind a bedroom or other room where noise may be a problem Wherever the unit is located walls to sound sensitive rooms should be fitted with sound insulation Route pipes so they are not fixed to an internal wall that backs on to a bedroom or living room Installation area Leave a free space of 500 mm in front of the supply air module All service on SAM 40 can be carried out from the front 500 NOTE Ensure that there is sufficient space 300 mm above the supply air module for installing ventilation hoses SAM 40 Removing the covers Front cover 1 Remove the service cover by pulling it straight out Chapter 2 Delivery and handling 3 The design of the supply air module Chapter 3 The design of the supply air module SAM 40 Pipe connections XL33 Ventilation connection supply air XL34 Ventilation connection outdoor air XL36 Connection heating medium in XL37 Connection heating medium out 1 HVAC components EP13 Supply air battery QM20 Venting heating medium QN40 Control valve heating medium
6. 70 Vs 30 C T 20 C 30 C T 20 C 10 C 10 362 75 h DUT 10 C Supply air flow SAM 40 Pressure drop diagram SAM 40 kPa Pressure drop over SAM 40 35 30 25 20 y 15 10 Water flow _ above SAM 40 100 200 300 400 500 600 700 800 900 1000 l h The diagram shows pressure drop across SAM 40 at different water flows Note that the pressure drop is the same as that which prevails across the climate sys tem 1 Check that the working point is inside the grey working area If the working point is inside the darker grey area to the left of the diagram it can give an oscillating supply air temperature NOTE Venting may be necessary on installation and after a period of use Vent through vent valve QM20 SAM 40 Chapter 4 Pipe and ventilation connections 13 14 General ventilation connection Ventilation installation must be carried out in accord ance with current norms and directives To prevent fan noise being transferred to the supply air devices it may be a good idea to install a silencer in the duct This is especially important if there are supply air devices in bedrooms Connections must be made via flexible hoses which must be installed so that they are easy to replace The outdoor air duct must be provided with diffusion tight insulation over its entire length Ensure that the con densati
7. QM20 High supply air temperature Incorrect value set in supply air automatic control system Enter menu 5 3 9 ext sup air md and adjust the setting for the supply air temperature Chapter 7 Disturbances in comfort SAM 40 8 Accessories Brackets Wall mounting of SAM 40 Part no 067 083 Buffer vessel UKV UKV 40 Part no 088 470 Top cabinet Top cabinet for concealing the ventilation ducts 245 mm Part no 089 756 345 mm Part no 089 757 395 645 mm Part no 089 758 SAM 40 Chapter 8 Accessories 21 9 Technical data 22 Dimensions and setting out coordinates 40 Y A 7 e ple x LO A Sr o d O22 s o 5 Y af ES E Qi A amp e Y i 9 EI 1 E Y am f 1 i LO o o 6 To Q 3 QS toy 40 1 55 19 275 290 305 540 SAM 40 Chapter 9 Technical data Technical specifications Electrical data Supply voltage V 230V50Hz Drive output actuator motor W 1 5 Driving power fan W 175 Enclosure class IP21 Heating medium circuit Min pressure MPa bar 0 05 0 5 Max pressure MPa bar 0 25 2 5 Ventilation Max airflow m3 h 300 Sound power level
8. Sensors etc BT22 BT23 BT68 BT69 SAM 40 Temperature sensor supply air Temperature sensor outdoor air Temperature sensor flow Temperature sensor return Electrical components AA5 Accessory card AA5 S2 Dip switch AA100 Joint card SF1 Switch position 0 1 main switch W101 Cord with connection plug W102 Control cable Ventilation GQ3 Supply air fan HQ11 Air filter supply air Miscellaneous PF1 Rating plate 1 Not visible in the image Designations in component locations according to standard IEC 81346 1 and 81346 2 Chapter 3 The design of the supply air module 4 Pipe and ventilation connections Heat exchanger General pipe connections Outline diagram Pipe installation must be carried out in accordance with current norms and directives Eon 2 g AD 4 y Sym bol key N Symbol Meaning C E Ya Control valve ol SZ Sm mi okt Shunt shuttle valve i A Temperature sensor ino c Expansion vessel D l Circulation pump O Fan UT m Compressor ar gt CERE Caution If the total circulating volume in the climate system excluding the heat pump volume falls below 40 litres extra system vo
9. or instruction concerning use of the appliance in a safe way and understand the hazards involved Chil dren shall not play with the appliance Cleaning and user maintenance shall not be made by children without super vision Rights to make any design or technical modifications are reserved ONIBE 2015 Symbols I NOTE s This symbol indicates danger to machine or person er Caution This symbol indicates important information about what you should observe when main taining your installation TIP N a Y This symbol indicates tips on how to facilitate using the product Marking SAM 40 is CE marked and fulfils IP 21 The CE marking means that NIBE ensures that the product meets all regulations that are placed on it based on relevant EU directives The CE mark is obligat ory for most products sold in the EU regardless where they are made IP21 means that objects with a diameter larger than or equivalent to 12 5 mm cannot penetrate and cause damage and that the product is protected against vertically falling drops of water Chapter 1 Important information Serial number The serial number can be found at the bottom left in side the front cover Serialnumber Caution Always give the product s serial number 14 digits when reporting a fault Country specific information Installer manual This installer manual must be left with the customer SAM 40 Inspection of the installation Fill
10. according to EN 12 102 Sound power level Ly a dB A 45 50 Sound pressure levels Sound pressure level in the boiler room Lipa dB A 41 46 Pipe connections Heating medium ext Y mm 22 Hot water ext Y mm 22 Ventilation mm 160 Dimensions and weight Width mm 600 Depth mm 556 Height mm 396 Weight kg 31 Part No 067 147 1The value varies with the selected fan curve For more detailed sound data including sound to channels visit www nibe eu 2 The value can vary with the room s damping capacity These values apply with a damping of 4 dB SAM 40 Chapter 9 Technical data 23 Electrical circuit diagram TL TE m 0 650 aeS epe Hume 1ed 07 WYS AVaDvId SNIYIM NaUaMS OAYVAYYW av 38 aN lt gt usaq Sa3eyday ld Papa L HS 19915 ol inmi w 9 3z x Sbuijas y3JIms cig Mossady yd Po sw indui vdd Evy EEL 20 ESL 9OLM amg g 6919 SUUM JL Ajd 9 m u EX MOBA Y E 7 185 p UMOIG Z ang wa TARE am 8918 EZ18 ld E 6918
11. and receive tips on what you can do to correct the problem that caused the alarm reset alarm In most cases it is enough to select reset alarm to correct the problem that caused the alarm If a green light illuminates after selecting reset alarm the alarm has been remedied If a red light is still visible and a menu called alarm is visible in the display the problem that caused the alarm remains If the alarm disappears and then returns see the troubleshooting section page 19 aid mode aid mode is a type of emergency mode This means that the heat pump produces heat and or hot water despite there being some kind of problem This can mean that the heat pump s compressor is not running In this case the immersion heater produces heat and or hot water NOTE 8 To select aid mode an alarm action must be selected in the menu 5 1 4 SAM 40 Caution Selecting aid mode is not the same as correct ing the problem that caused the alarm The status lamp will therefore continue to be red Troubleshooting If the operational interference is not shown in the dis play the following tips can be used Basic actions Start by checking the following possible fault sources That the heat pump is running or that the supply cable to SAM 40 is connected Group and main fuses of the accommodation The property s earth circuit breaker The heat pump s miniature circuit breaker FA1 The heat pump s temperature l
12. ems OY Juurakkotie 3 01510 Vantaa Puh 09 274 697 0 Fax 09 274 697 40 E mail info nibe fi www nibe fi FR NIBE Energy Systems France Sarl Zone industrielle RD 28 Rue du Pou du Ciel 01600 Reyrieux Tel 04 74 00 92 92 Fax 04 74 00 42 00 E mail info nibe fr www nibe fr GB NIBE Energy Systems Ltd 3C Broom Business Park Bridge Way Chesterfield 541 9QG Tel 0845 095 1200 Fax 0845 095 1201 E mail info nibe co uk www nibe co uk NL NIBE Energietechniek B V Postbus 634 NL 4900 AP Oosterhout Tel 0168 477722 Fax 0168 476998 E mail infoQnibenl nl www nibenl nl NO ABK AS Brobekkveien 80 0582 Oslo Postadresse Postboks 64 Vollebekk 0516 Oslo 1 D Tel sentralbord 47 23 17 05 20 E mail post abkklima no www nibeenergysystems no PL NIBE BIAWAR Sp z o o Aleja Jana Pawfa II 57 15 703 BIALYSTOK 085 662 84 90 Fax 085 662 84 14 E mail sekretariat biawar com p www biawar com pl RU EVAN 17 per Boynovskiy Nizhny Novgorod 1 D fax 7 831 419 57 06 E mail info evan ru www nibe evan ru SE NIBE AB Sweden Box 14 Hannabadsv gen 5 SE 285 21 Markaryd 46 0 433 73 000 Fax 46 0 433 73 190 E mail info nibe se www nibe se 1 D 1 D For countries not mention in this list please contact Nibe Sweden or check www nibe eu for more information Chapter 1 Important information SAM 40 2 Delivery and handling Transport The supply air module must be transported and stored dry Assembly SAM
13. es to the previous board 3 Fixexternal cable routing 4 Install the protective cover and the service cover according to the heat pump Installation manual 5 Connect plug W101 SAM 40 dad 3aeaaa ado DIP switch The DIP switch S2 on the accessory board AA5 is set in the factory as below o E N AA5 S2 a GET ol LB Bs E Da iol E D k 53 o E 3 p m vm B P Ed 15 q sc Fs 5 85 E N Chapter 5 Electrical connections 15 16 6 Commissioning and adjusting Preparations 1 Check that the switch SF1 for F750 is in position y 2 Check that the filling valves QM 10 and QM11 in the heat pump are fully closed CER Caution Check the miniature circuit breaker FA1 in the heat pump It may have tripped during tran
14. imiter FD1 Correctly set load monitor if installed Low hot water temperature or a lack of hot water The heat pump has temporarily prioritised supply air ventilation to prevent too low temperatures in the supply air coil Low room temperature ncorrect value set in supply air automatic control system Enter menu 5 3 9 ext sup air md and adjust the setting for the supply air temperature Air in the heating medium system Ventthe heating medium system via its vent valve QM20 High room temperature ncorrect value set in supply air automatic control system Enter menu 5 3 9 ext sup air md and adjust the setting for the supply air temperature Low or a lack of ventilation The ventilation is not adjusted Order implement ventilation adjustment Filter HQ12 blocked Clean or replace the filter Supply air device closed blocked or throttled down too much Check and clean the supply air device High or distracting ventilation The ventilation is not adjusted Order implement ventilation adjustment Filter HQ12 blocked Clean or replace the filter Chapter 7 Disturbances in comfort 19 20 Low supply air temperature Incorrect value set in supply air automatic control system Enter menu 5 3 9 ext sup air md and reduce the setting for the supply air temperature Air in the heating medium system Ventthe heating medium system via its vent valve
15. in the page for information about installation data in the User manual Current regulations require the supply air module must be inspected before it is put into service The inspection must be carried out by a suitably qualified person Description Ventilation page 14 Signature Date Setting ventilation flow exhaust air Setting ventilation flow supply air Heating medium page 10 System flushed Accessories bled Check against output and pressure drop diagrams Connected according to outline diagram Electricity page 15 Supply connected 230 V Connected communication SAM 40 Chapter 1 Important information Contact information AT KNV Energietechnik GmbH Gahberggasse 11 4861 Sch rfling 43 0 7662 8963 0 Fax 43 0 7662 8963 44 E mail mail knv at www knv at CH NIBE W rmetechnik AG Winterthurerstrasse 710 CH 8247 Flurlingen Tel 52 647 00 30 Fax 52 647 00 31 E mail info nibe ch www nibe ch CZ Druzstevni zavody Drazice s r o Drazice 69 CZ 294 71 Benatky nad Jizerou Tel 420 326 373 801 Fax 420 326 373 803 E mail nibe nibe cz www nibe cz DE NIBE Systemtechnik GmbH Am Reiherpfahl 3 29223 Celle Tel 05141 7546 0 Fax 05141 7546 99 E mail info nibe de www nibe de DK Volund Varmeteknik A S Member of the Nibe Group Brog rdsvej 7 6920 Videbaek Tel 97 17 20 33 Fax 97 17 29 33 E mail info volundvt dk www volundvt dk FI NIBE Energy Syst
16. ing the house wiring For the supply air module wiring diagram see page 24 Signal cables to external connections must not be laid close to high current cables If the supply cable is damaged only NIBE its service representative or similar authorised person may re place it to prevent any danger and damage NOTE a Electrical installation and service must be car ried out under the supervision of a qualified electrician Electrical installation and wiring must be carried out in accordance with the stipulations in force Connections Connecting to F750 This section describes the electrical connection for controlling SAM 40 from NIBE F750 The heat pump switch must be in the position and the switch on SAM 40 in position O before any work is carried out 1 Ensurethatthe products are completely disconnec ted from the power source Remove the front hatch and protective cover to the input card on the heat pump according to the instructions in its Installer s manual 2 Connect cable W102 to position X4 on the input board in the heat pump according to the electrical wiring diagram on page 24 Use the cable lead in in the heat pump when routing cables If several accessories are to be connected or are already installed the adjacent wiring diagram must be followed The first accessory board must be connected dir ectly to the heat pump s terminal block AA3 X4 The following boards must be connected in seri
17. lume is connec ted for example volume vessel UKV CP1 ac cording to the outline diagram above NOTE If several climate systems ECS 40 ECS 41 are present SAM 40 must be connected in parallel with climate system 1 A circulation pump must be used to ensure the flow over SAM 40 Chapter 4 Pipe and ventilation connections SAM 40 Dimensions and pipe connec tions 40 gt rt Y 9 mle LO la LI N o A 922 Y 420 I 9 9 D 40 55 SAM 40 Mounting Installing on brackets 1 Install SAM 40 on brackets 2 Connect heating medium and ventilation pipes Chapter 4 Pipe and ventilation connections Installing on VPB 200 Caution For connection of VPB 200 together with F750 docking kit DEW 40 is used 1 Remove the service cover from VPB 200 2 Remove the top panel from VPB 200 installed with 6 screws 3 Install DEW 40 according to the instructions in the installation manual The pipes in VPB 200 can be adjusted replaced in such a way that SAM 40 can easily be installed above VPB 200 4 mw 5 Secure SAM 40 with the 2 screws supplied 6 Connect heating medium and ventilation pipes 7 Reinstall the service cover on VPB 200 Chapter 4
18. on insulation is sealed at any joints and or at lead in nipples silencers roof cowls or similar Provision must be made for inspection and cleaning ofthe duct Make sure thatthere are no reductions of cross section al area in the form of creases tight bends etc since this will reduce the ventilation capacity The air duct system must be a minimum of air tightness class B Supply air Outdoor air 195 275 6160 Chapter 4 Pipe and ventilation connections Ventilation flow The supply air flow must be lower than the exhaust air flow to prevent over pressure in the house Ensure that the ventilation openings are not blocked Set the ventilation capacity in the heat pump s menu system menu 5 1 5 Adjusting ventilation To obtain the necessary air exchange in every room of the house the exhaust air device and the supply air device must be correctly positioned and adjusted and the fans in the heat pump and supply air module adjus ted Immediately after installation adjust the ventilation so that it is set according to the projected value of the house A defective ventilation installation may lead to reduced installation efficiency and thus poorer operating eco nomy and may result in moisture damage to the house SAM 40 5 Electrical connections General All electrical equipment is connected at the factory Disconnect SAM 40 before insulation test
19. rm 19 Manage alarm 19 Troubleshooting 19 E Electrical circuit diagram 24 Electrical connections 15 Connections 15 General 15 H Heating medium side 10 Output transfer to the supply air 11 I Important information 2 Safety information 2 Inspection of the installation 3 M Manage alarm 19 Marking 2 Output transfer to the supply air 11 SAM 40 P Pipe and ventilation connections 8 Adjusting ventilation 14 Dimensions and pipe connections 9 General pipe connections 8 General ventilation connection 14 Heating medium side 10 Ventilation flow 14 Pipe connections Symbol key 8 Preparations 16 R Removing the covers 5 S Safety information 2 Contact information 4 Inspection of the installation 3 Marking 2 Serial number 2 Symbols 2 Serial number 2 Start up and inspection 16 Setting the ventilation 17 Symbol key 8 Symbols 2 T Technical data 22 Dimensions and setting out coordinates 22 Electrical circuit diagram 24 Technical Data 23 Technical Data 23 The design of the supply air module 6 List of components 7 Transport Assembly 5 Troubleshooting 19 V Ventilation flow 14 Chapter 10 Item register 25 NIBE AB Sweden Hannabadsv gen 5 Box 14 SE 285 21 Markaryd info nibe se www nibe eu 031934
20. s can be done in the menu system Menu 5 2 system settings Activating deactivating of accessories Select ext sup air md Gee Caution This accessory may require a program software update in your F750 The heat pump software must be version 3585R2 or later SAM 40 Setting the ventilation Ventilation must be set according to applicable stand ards The supply air flow is adjusted so that it is 80 of the exhaust air flow The setting is made in menu 5115 Even if ventilation is roughly set at installation it is im portant that a ventilation adjustment is ordered and permitted NOTE s Order a ventilation adjustment to complete the setting Available pressure Pa 400 350 300 250 200 90 100 80 150 Sen 70 100 60 50 50 0 40 Airflow 0 50 100 150 200 250 300 m3 h 20 40 60 80 Vs ruwe 90 100 fo 80 60 Zee a esed un 60 Airflow 0 50 100 150 200 250 300 m3 h 20 40 60 80 Us Chapter 6 Commissioning and adjusting 17 18 Setting of supply air temperature Set the supply air temperature in menu 5 3 9 ext sup air md Note that when changing the supply air temperature the settings for other parts of the climate system need to be adjusted supply air temp at low outdoor outdoor tempT1 supply air temp at T1 supply air temp at avg outdoor temp ou
21. sportation Connecting to heating medi um system 1 Connect SAM 40 according to the outline diagram on page 8 2 Fillwith water using the filler valve QM11 in F750 3 Ventthe heating medium system with the vent valves QM20 above SAM 40 and the vent valves in F750 and fill if necessary using the filler valve QM11 in F750 Chapter 6 Commissioning and adjusting Start up and inspection Start up NOTE s There must be water in the climate system before the switch in F750 is set to I 1 Set switch SF1 onSAM 40 in position 1 2 Setthe heat pump s switch to I 3 Follow the instructions in the start guide in the heat pump display If the start guide does not start when you start the heat pump start it manually in menu 5 7 Commissioning The first time the heat pump is started a start guide is started The start guide instructions state what needs to carried out at the first start together with a run through of the heat pump s basic settings The start guide ensures that the start up is carried out correctly and cannot be bypassed The start guide can be started later in menu 5 7 Caution As long asthe start guide is active no function in the installation will start automatically The guide will appear at each installation re start until it is deselected on the last page SAM 40 Menu system If you do not make all settings via the start guide or need to change any of the settings thi
22. tdoor tempT2 Es At outdoor temperatures that lie between the stated points in the diagram below the supply air temperature can be calculated linearly The angle of the graph con tinues outside the stated points Supply air temperature Me 48 Max 20 15 10 5 0 5 10 15 20 2 3 Outdoor temp Chapter 6 Commis SAM 40 7 Disturbances in comfort In most cases the heat pump F750 notes operational interference operational interference can lead to dis turbance in comfort and indicates this with alarms and shows action instructions in the display Info menu F750 All the heat pump measurement values are gathered under menu 3 1 in the heat pump menu system Looking through the values in this menu can often simplify finding the source of the fault Manage alarm I in YET info action reset alarm aid mode Inthe event of an alarm some kind of malfunction has occurred which is indicated by the status lamp chan ging from green continuously to red continuously In addition an alarm bell appears in the information window Alarm In the event of an alarm with a red status lamp a mal function has occurred that the heat pump cannot remedy itself In the display by turning the control knob and pressing the OK button you can see the type of alarm it is and reset it You can also choose to set the heat pump to aid mode info action Here you can read what the alarm means
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