Viessmann VITOCAL 250-A Installation And Service Instructions Manual
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Viessmann VITOCAL 250-A Installation And Service Instructions Manual

Viessmann VITOCAL 250-A Installation And Service Instructions Manual

Air source heat pump, monoblock version for heating and cooling operation
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VIESMANN
Installation and service instructions
for contractors
Vitocal 250-A
Type AWO(-M)-E-AC/AWO(-M)-E-AC-AF 251.A
Air source heat pump, monoblock version for heating and cooling operation, with
1 integrated heating/cooling circuit
Type AWO(-M)-E-AC/AWO(-M)-E-AC-AF 251.A 2C
Air source heat pump, monoblock version for heating and cooling operation, with
2 integrated heating/cooling circuits
VITOCAL 250-A
Please keep safe.
6202074 GB
2/2023

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Summary of Contents for Viessmann VITOCAL 250-A

  • Page 1 VIESMANN Installation and service instructions for contractors Vitocal 250-A Type AWO(-M)-E-AC/AWO(-M)-E-AC-AF 251.A Air source heat pump, monoblock version for heating and cooling operation, with 1 integrated heating/cooling circuit Type AWO(-M)-E-AC/AWO(-M)-E-AC-AF 251.A 2C Air source heat pump, monoblock version for heating and cooling operation, with...

  • Page 2: Target Group

    Safety instructions Safety instructions Please follow these safety instruc- tions closely to prevent accidents and material losses. Safety instructions explained Danger Note This symbol warns against the risk Details identified by the word "Note" of injury. contain additional information. Please note The outdoor unit contains easily flamma- This symbol warns against the risk ble refrigerant in safety group A3...

  • Page 3: Safety Instructions

    Safety instructions Safety instructions (cont.) Regulations to be observed National installation regulations Relevant country-specific safety regu- ■ ■ Statutory regulations for the prevention lations ■ of accidents Applicable regulations and guidelines ■ Statutory regulations for environmental for operation, service, maintenance, ■...

  • Page 4: Working On The System

    Safety instructions Safety instructions (cont.) Do not remove, block or bridge safety Please note ■ equipment. Electronic assemblies can be dam- Do not make any changes: aged by electrostatic discharge. ■ Do not modify the outdoor unit, inlet/ Before beginning work, touch outlet lines, electrical connections/ earthed objects, such as heating or cables or the surroundings.
  • Page 5 Safety instructions Safety instructions (cont.) A CO or powder extinguisher must be Danger ■ Refrigerant is under pressure: to hand in the following cases: Mechanical loading of lines and Refrigerant is being drained. – components can cause leaks in the Refrigerant is being topped up.

  • Page 6: Connecting Cables

    Freezing can cause damage to the safe operation of the system. heat pump. Replace faulty components only ■ Thermally insulate all the ■ with genuine Viessmann spare hydraulic lines. parts. In order to activate the frost pro- ■ Do not undertake any repairs on ■...
  • Page 7 Safety instructions Safety instructions (cont.) Safety instructions for operating the system What to do if refrigerant escapes If water escapes from the appliance Danger Danger Escaping refrigerant can lead to fire If water escapes from the appliance and explosions that result in very there is a risk of electric shock.
  • Page 8 Safety instructions Safety instructions (cont.) Safety instructions for storage of the outdoor unit The outdoor unit is charged at the fac- Temperature range for storage: 25 °C – ■ tory with refrigerant R290 (propane). to 70 °C Only store the outdoor unit in its ex- ■...
  • Page 9 230 V~ junction box: 230 V~ components and switching contacts ..57 ■ HPMU electronics module: Accessory 230 V~ and BUS connection . 61 ■ Connecting with other Viessmann appliances via the CAN bus ..63 ■ EHCU electronics module: Additional contact humidistat ....65 ■...
  • Page 10 ■ Removing the additional EPP insulation pieces ......... 145 ■ Status display, internal circulation pumps ..........146 Checking the temperature sensors ............147 Viessmann NTC 10 k (blue marking) ..........148 Ω ■ Checking the pressure sensors ............. 149 Checking the fuse .................. 149 8.
  • Page 11 Index Index (cont.) Removing the rear casing ..............157 ■ Overview of electrical components ............158 Outdoor unit with 1 fan ............... 159 ■ Outdoor unit with 2 fans ..............160 ■ Checklist for maintenance work .............160 Overview of internal components ............165 Outdoor unit with 1 fan ...............

  • Page 12: Intended Use

    Information Disposal of packaging Please dispose of packaging waste in line with statu- tory regulations. Symbols Symbols in these instructions The steps in connection with commissioning, inspec- tion and maintenance are found in the "Commission- ing, inspection and maintenance" section and identified Symbol Meaning as follows:...

  • Page 13: Layout And Functions

    Product information Layout and functions Vitocal 250-A is a monoblock air source heat pump, The flow temperature is controlled by modulating the comprising 1 indoor unit and 1 outdoor unit. heat pump.
  • Page 14 Information Product information (cont.) System with external buffer cylinder The indoor and outdoor units communicate via CAN bus. ■ Type AWO(-M)-E-AC 251.A/ AWO(-M)-E-AC-AF 251.A Type plate The heat pump heats or cools up to 4 heating/cool- ing circuits: 1 heating/cooling circuit without mixer and up to 3 heating/cooling circuits with mixer A cooling water buffer cylinder or heating/cooling water buffer cylinder is required to use the cooling...
  • Page 15 Outdoor unit Integral Instantaneous heating water heater System examples Available system examples: See www.viessmann-schemes.com. Maintenance parts and spare parts Maintenance parts and spare parts can be identified and ordered directly online. Viessmann Partnershop Viessmann spare part app Login: www.viessmann.com/etapp https://shop.viessmann.com/...
  • Page 16 Preparing for installation Requirements for on-site connections Indoor unit with 1 integrated heating/cooling circuit A B C Fig. 2 Min. installation height: Heating water to outdoor unit, connection Cu 28 x Depending on the installation position of program- 1.0 mm ming unit DHW cylinder return (on the heating water side), Secondary circuit flow (heating/cooling circuit 1/...

  • Page 17: Requirements For On-Site Connections

    Preparing for installation Requirements for on-site connections (cont.) Drain hose safety valve Extra low voltage (ELV) connection socket < 42 V Note Min. installation height: See chapters "Installing the indoor unit", "Minimum installation heights" on page 40.
  • Page 18 Preparing for installation Requirements for on-site connections (cont.) Indoor unit with 2 integrated heating/cooling circuits F G H Fig. 3 Min. installation height: DHW cylinder flow (on the heating water side), Depending on the installation position of program- connection Cu 22 x 1.0 mm ming unit Heating water from outdoor unit, connection Cu 28 Heating/cooling circuit 2 flow, connection Cu 28 x...
  • Page 19 Preparing for installation Requirements for on-site connections (cont.) Heating/cooling circuit 1 return, connection Cu 28 Junction box 230 V~ x 1.0 mm Drain hose safety valve Extra low voltage (ELV) connection sockets < 42 V Extra low voltage (ELV) connection socket < 42 V Note Min.
  • Page 20 Preparing for installation Requirements for on-site connections (cont.) Outdoor unit with 2 fans 1144 Fig. 5 Heating water to indoor unit (heating water outlet): Power cable Plug-in connection for Cu 28 x 1.0 mm CAN bus communication cable (accessories) Heating water from indoor unit (heating water Condensate drain inlet): Plug-in connection for Cu 28 x 1.0 mm...

  • Page 21: Installing The Outdoor Unit

    Installation sequence Installing the outdoor unit Transport Danger Please note The outdoor unit is filled with refrigerant R290 Scratches on the surface coating will lead to cor- (propane): Mechanical loading can lead to leaks rosion. in the refrigerant circuit. Where leaks of refriger- ■...
  • Page 22 Installation sequence Installing the outdoor unit (cont.) Fig. 6 Transport aid...

  • Page 23: Transport By Crane

    Installation sequence Installing the outdoor unit (cont.) Removing the transport aids After handling, remove all transport aids. Fig. 7 Transport by crane Danger 2. Protect the evaporator on the rear side of the out- Incorrect unloading and transportation can result door unit against damage: in damage to the outdoor unit.

  • Page 24: Installation Information

    Installation sequence Installing the outdoor unit (cont.) 1000 Fig. 8 Transport by crane using the example of the outdoor unit with 2 fans Installation information The difference in height between the hydraulic connec- Floorstanding installation tions of the outdoor unit and the indoor unit must not exceed 6 m.
  • Page 25 Installation sequence Installing the outdoor unit (cont.) Wall mounting The higher roof and wind loads must be taken into ■ account in the structural calculations and the fixture ■ Use the wall mounting bracket set (accessories). system of the outdoor unit. ■...
  • Page 26 Installation sequence Installing the outdoor unit (cont.) Siting in garages, multi-storey car parks and car Floorstanding installation: parking areas: ■ Ensure that condensate can drain freely. ■ Prior to installation, it must be established for the ■ Allow condensate to seep away into a gravel bed or case in question whether the installation is permissi- into a deep seepage layer, or direct it into the waste ble under local garage and parking area regulations...

  • Page 27: Installation Location

    Installation sequence Installing the outdoor unit (cont.) Weight of outdoor units Outdoor unit Weight in kg Outdoor unit with 1 fan Outdoor unit with 2 fans Outdoor unit 230 V~ ■ Outdoor unit 400 V~ ■ Installation location ■ Maximum geographical height of the installation Additional requirements for flat roof installation: location: 1500 m above sea level ■...
  • Page 28 Installation sequence Installing the outdoor unit (cont.) Note Corner positioning of the outdoor unit, right The particular safety zone is dependent on the sur- roundings of the outdoor unit. ■ The safety zones shown in the following are for the 2394 floorstanding installation of an outdoor unit with 2 fans.

  • Page 29: Minimum Clearances

    Installation sequence Installing the outdoor unit (cont.) Floor area of safety zone If necessary, it is possible to deviate from the dimen- sions of 1000 mm to the side and 1800 mm to the front. Please note the following: ■ There must be a safety zone to the front and side.
  • Page 30 Installation sequence Installing the outdoor unit (cont.) Draining condensate via drain pipe in seepage Draining condensate via waste water system layer Fig. 15 Fig. 14 Outdoor unit Outdoor unit Support for floorstanding installation (accessories) Support for floorstanding installation (accessories) with design casing (accessories) with design casing (accessories) Condensate drain connector Condensate drain connector...
  • Page 31 Installation sequence Installing the outdoor unit (cont.) Fig. 16 Frost protection for foundations: compacted Hydraulic connection set (accessories) for line crushed stone (e.g. 0 to 32/56 mm); thickness of entry below ground level: layer subject to local requirements and building So that the floorstanding installation connection set regulations (accessories) can be used, align both lines of the...
  • Page 32 Installation sequence Installing the outdoor unit (cont.) Fig. 17 Frost protection for foundations: compacted Hydraulic connection set (accessories) for line crushed stone, e.g. 0 to 32/56 mm entry below ground level: Thickness of layer subject to local requirements So that the floorstanding installation connection set and building regulations (accessories) can be used, align both lines of the Foundation strip of reinforced concrete...
  • Page 33 Installation sequence Installing the outdoor unit (cont.) 3000 Fig. 18 Max. wall separation with design casing (accessories): 300 mm Ground Support for floorstanding installation (accessories), Pathway, patio illustration without design casing (accessories) Hydraulic connection lines, indoor/outdoor unit Foundation strip Indoor/outdoor unit CAN bus communication cable For free drainage of condensate: Gravel bed as and outdoor unit power cable: soakaway...

  • Page 34: Wall Mounting

    Installation sequence Installing the outdoor unit (cont.) Note ■ Provide thermal insulation of sufficient thickness on the pipework to the outdoor air: See table on page 26. ■ Protect the pipework against damage. Avoid trip haz- ards. Installing an outdoor unit on foundations Installation with support for floorstanding installa- tion (accessories) 3000...

  • Page 35: Opening The Outdoor Unit

    Installation sequence Installing the outdoor unit (cont.) Danger Wall mounting with bracket set for wall mounting Incorrect installation can lead to equipment damage and personal injury, e.g. if the outdoor Note unit falls down or falls over. The following information for wall mounting applies to Only install the outdoor unit in accordance with outdoor units with 1 and 2 fans.
  • Page 36 Installation sequence Installing the outdoor unit (cont.) Fig. 21 3. Check visible components of the outdoor unit for transport and storage damage. Connecting the hydraulic connection lines Connect the connection lines of the hydraulic connec- tion set (accessories) to the underside of the outdoor unit using either copper pipe or corrugated stainless steel pipe, dependent upon the connection set.
  • Page 37 Installation sequence Installing the outdoor unit (cont.) Requirements to be met by on-site lines Requirements to be met, e.g. regarding cross-section, system pressure: See technical guides. Installing the heating water filter Install a heating water heater filter in the return to the outdoor unit in the following cases: ■...

  • Page 38: Installing The Indoor Unit

    Installation sequence Installing the outdoor unit (cont.) Fig. 23 Locking screw Rotational direction for locking the transport bracket Rotational direction for releasing the transport bracket After positioning of the outdoor unit, check whether the transport bracket is completely secured with an Allen key (size 5).
  • Page 39 Installation sequence Installing the indoor unit (cont.) WiFi operational reliability and system require- Note ments The WiFi signal strength can be increased with com- mercially available WiFi repeaters. WiFi router system requirement ■ WiFi router with activated WiFi: Angle of penetration The WiFi router must be protected by a sufficiently secure WPA2 password.
  • Page 40 Installation sequence Installing the indoor unit (cont.) Minimum clearances Do not install the indoor unit in a cupboard. Fig. 26 Minimum installation heights In the delivered condition, the programming unit is Recommended dimensions located at the bottom. For easier access, the program- ming unit can be fitted at the top, e.g.

  • Page 41: Connecting The Secondary Circuit

    Installation sequence Installing the indoor unit (cont.) Fig. 28 Bracket for additional fixing screw, e.g. in earth- quake regions Connecting the secondary circuit The following requirements must be met on site: ■ If the indoor unit was installed on the wall using a ■...
  • Page 42 Installation sequence Connecting the secondary circuit (cont.) Fitting the connection pieces supplied Indoor unit with 1 integrated heating/cooling circuit Fig. 29 Secondary circuit flow (heating/cooling circuit 1/ DHW cylinder return (on the heating water side), external buffer cylinder), connection Cu 28 x connection Cu 22 x 1.0 mm 1.0 mm Secondary circuit return (heating/cooling circuit 1/...

  • Page 43: Making The Hydraulic Connections

    Installation sequence Connecting the secondary circuit (cont.) Indoor unit with 2 integrated heating/cooling circuits Fig. 30 Heating/cooling circuit 2 flow, connection Cu 28 x Heating water to outdoor unit (indoor unit heating 1.0 mm water outlet), connection Cu 28 x 1.0 mm Heating/cooling circuit 2 return, connection Cu 28 DHW cylinder return (on the heating water side), x 1.0 mm...

  • Page 44: Temperature Limiter

    Installation sequence Connecting the secondary circuit (cont.) 2. Connect all secondary side hydraulic lines (room Please note heating/cooling, DHW heating) to the indoor unit. Leaking hydraulic lines and joints will cause damage to the system or to the building. Please note Do not thermally insulate joints until after Hydraulic connections subjected to mechani- completion of the leak test following filling:...
  • Page 45 Installation sequence Connecting the secondary circuit (cont.) Systems with external buffer cylinder Heating/cooling circuits 1, 2, 3 and 4: ■ Use 230 V~ contact humidistat. Connect to respective mixer extension kit of the ■ heating/cooling circuit (ADIO electronics module). Connection on the DHW side For connecting the DHW side, observe EN 806, Drinking water filter DIN 1988, DIN 4753, TrinkwV Drinking Water Ordi-...
  • Page 46 Installation sequence Connecting the secondary circuit (cont.) Both connections from and to the outdoor unit are hydraulically connected for this purpose. It is essential to install an air vent valve and a non-return valve in this connection line: See Fig. 31. Fig.

  • Page 47: Preparing The Electrical Connections

    Installation sequence Indoor unit: Removing the front panel Fig. 32 Electrical connection Preparing the electrical connections Cables Cable lengths in the indoor unit For cable lengths and cable cross-sections: See the ■ following tables. Some connection areas, e.g. for power supply and the ■...
  • Page 48 Installation sequence Electrical connection (cont.) Recommended power cables Indoor unit Power supply Cable Max. cable length Control unit/PCB 230 V~ Without power-OFF 50 m 3 x 1.5 mm ■ With power-OFF 50 m 5 x 1.5 mm ■ Instantaneous heating water heater 400 V~ 25 m 5 x 2.5 mm...
  • Page 49 Installation sequence Electrical connection (cont.) Overview of electrical terminal areas Fig. 33 HMI programming unit Junction box 230 V~ HPMU electronics module Extra low voltage (ELV) connection sockets 42 V ≤ EHCU electronics module Extra low voltage (ELV) connection socket 42 V ≤...
  • Page 50 Installation sequence Electrical connection (cont.) Removing the programming unit mounting bracket Opening the HPMU electronics module Fig. 34 Fig. 35...

  • Page 51: Indoor Unit: Routing Cables To The Wiring Chamber

    Installation sequence Electrical connection (cont.) Opening the EHCU electronics module Opening the 230 V~ junction box Fig. 37 Closing the junction box ■ After completing all electrical connections, seal the junction box tightly. ■ Torque for the screws: 2.8 Nm Fig.
  • Page 52 Installation sequence Electrical connection (cont.) Please note If apertures are not securely sealed this can lead to damage from condensation, vibrations and excessive noise. ■ Only break out as many terminal area open- ings as are needed for cable entries. Use suitable strain relief or cable fittings for all ■...
  • Page 53 Installation sequence Electrical connection (cont.) 230 V~ <42 V Fig. 38 Junction box 230 V~ HPMU electronics module EHCU electronics module...
  • Page 54 Installation sequence Electrical connection (cont.) Route the leads to the 230 V~ junction box Route the cables through the cable fittings. Firmly ■ secure cables. ■ Only break out as many openings in the cover as ■ Also, apply strain relief to the terminal area cables. needed.
  • Page 55 Installation sequence Electrical connection (cont.) Connection sockets: Sensors and BUS connections 10 kΩ 24 V CAN H CAN L 10 kΩ 10 kΩ Fig. 39 6-pole connection socket on the left 6-pole connection socket on the right 5-pole connection socket on the right...
  • Page 56 CAN bus system: e.g. Vitocharge VX3 For recommended connecting cable and fur- ther information: See chapter "Connecting with other Viessmann appliances via the CAN bus". The connection is routed internally to plug 91 in the HPMU electronics module. Do not connect CAN Ground (GND)!
  • Page 57 Installation sequence Electrical connection (cont.) 5-pole connection socket Terminals Component Explanation 74.1 Connection of additional PlusBus subscrib- Cores are interchangeable 74.2 ers via plug 74, e.g. mixer extension kit Recommended connecting cable: Unshielded data cable: 2 x 0.34 mm ■ Max.
  • Page 58 Installation sequence Electrical connection (cont.) 11-pin plug Clamps Component/function Explanation P2.N DHW circulation pump Output: 230 W ■ Voltage: 230 V~ ■ P2.L Max. switching current: 1 A ■ Recommended connecting cable: 3 x 1.5 mm ■ Max. cable length: 50 m ■...
  • Page 59 Installation sequence Electrical connection (cont.) The following functions are available via the 4 digital inputs: Functions Digital inputs Explanation 143.2 143.3 143.4 143.5 Power-OFF Requires floating N/C contact: — — — Closed: Heat pump operational ■ Open: Heat pump shut down ■...
  • Page 60 Installation sequence Electrical connection (cont.) Functions Digital inputs Explanation 143.2 143.3 143.4 143.5 External blocking External blocking of refrigerant circuit and instantane- — — — ous heating water heater 143.1 143.2 Floating contact (on site) Heating/cooling Temperature limiter to restrict the maximum tempera- —...
  • Page 61 Installation sequence Electrical connection (cont.) HPMU electronics module: Accessory 230 V~ and BUS connection F1 T6.3 A Fig. 41 F1 Fuse 6.3 A H (slow) Make all connections with flexible cables. 230 V~ connections Terminals Component Explanation 156.N Switched mains output for mains connec- Output: 230 W ■...
  • Page 62 Vitocharge VX3 Recommended connecting cable: Pre-assembled bus cable (accessories) ■ For further information: See chapter "Con- necting with other Viessmann appliances via the CAN bus". Do not connect CAN Ground (GND)! Note Plug 72 of the indoor/outdoor unit CAN bus...
  • Page 63 156 Power supply for PlusBus subscribers in the HPMU electronics module Mixer extension kit Connecting with other Viessmann appliances via the CAN bus The heat pump can be connected with other compati- Recommended cable ble appliances via the external CAN bus. Depending on what other compatible appliances it is combined ■...
  • Page 64 Installation sequence Electrical connection (cont.) Terminator The heat pump is the central subscriber When integrating into an external CAN bus system, a distinction is made as to whether the heat pump is the first, last or central subscriber. Any terminators con- nected at the factory may need to be removed: See following chapter.
  • Page 65 Installation sequence Electrical connection (cont.) EHCU electronics module: Additional contact humidistat Only for indoor unit with 2 integral heating/cooling cir- cuits. 24 V Fig. 46...
  • Page 66 Installation sequence Electrical connection (cont.) Clamps Component Explanation X22.1 GND Contact humidistat, 24 V for heating/cool- Recommended connecting cable: X22.2 24 V ing circuit 2 ■ 2 x 0.75 mm Max. cable length: 25 m Note Use only 230 V~ contact humidistat in con- 2 x 1.5 mm ■...
  • Page 67 Installation sequence Electrical connection (cont.) Fitting the programming unit bracket at the top 0 ° Fig. 47...
  • Page 68 Installation sequence Electrical connection (cont.) Installing the programming unit Fig. 48 Lightguide Programming unit...
  • Page 69 Installation sequence Electrical connection (cont.) Checking the outdoor unit connection version Fig. 49 Connection version : With plug Connection version : With cable entry Only for outdoor unit with 2 fans For outdoor unit with 1 or 2 fans Plug for CAN bus communication cable Cable entry for CAN bus communication cable Plug for power cable Cable entry for power cable...
  • Page 70 Installation sequence Electrical connection (cont.) Preparing the electrical connection on the outdoor unit Connection version : With plug Fig. 50 Plug for CAN bus communication cable Plug for power cable Remove cap on power supply.
  • Page 71 Installation sequence Electrical connection (cont.) Length of cable in appliance: Connection version : With cable entry ■ Compressor power cable 230 V~: 300 mm Outdoor unit with 1 fan: Cable routing to the termi- ■ CAN bus communication cable: 900 mm nal area Fig.
  • Page 72 Installation sequence Electrical connection (cont.) Outdoor unit with 2 fans: Cable routing to the terminal area Fig. 52 Compressor power supply 230 V~/400 V~ Cable entry for CAN bus communication cable Connection for CAN bus communication cable Torque: 6 Nm (accessories) Cable entry for power cable Torque: 8 Nm...
  • Page 73 Installation sequence Electrical connection (cont.) Recommended cable ■ Recommended cable: Indoor/outdoor unit bus communication cable (acces- sories), fully wired, in 5, 15 or 30 m lengths For wiring on site: ■ Only use the cable types listed in the following two tables.
  • Page 74 Installation sequence Electrical connection (cont.) Connection version : With plug CAN H CAN L Fig. 53 Note Only use cables with shielding: Connect the shielding on both sides of the connecting cable to the "GND" connection.
  • Page 75 Installation sequence Electrical connection (cont.) Observe the following for on-site cables: Connection version : With cable entry ■ Cable length: Note Min. 3 m Only use cables with shielding: Max. 30 m Connect the shielding on both sides of the connecting cable to the "GND"...
  • Page 76 Installation sequence Electrical connection (cont.) Outdoor unit with 2 fans Vitocal 230 V Vitocal 400 V Fig. 55...
  • Page 77 Installation sequence Closing the indoor unit Danger Please note The absence of system component earthing can If a casing door is not securely closed this can lead to serious injury from electrical current and lead to damage from condensation, vibrations component damage in the event of an electrical and excessive noise.
  • Page 78 Installation sequence Closing the indoor unit (cont.) Indoor unit: Fitting the front panel Fig. 56...

  • Page 79: Power Supply

    Installation sequence Power supply Isolators for non-earthed conductors Consult your power supply utility, which may offer dif- ■ ■ Install an isolator in the power cable to provide ferent supply tariffs for the power circuits. omnipolar separation from the mains for all active Observe the technical connection conditions of the conductors, corresponding to overvoltage category power supply utility.
  • Page 80 Installation sequence Power supply (cont.) Only types ... SP: Heat pumps with central power supply on the indoor unit Shared power supply for heat pump control unit and 1/N/PE 230 V/50 Hz ■ instantaneous heating water heater: Recommended power cable: ■...
  • Page 81 Installation sequence Power supply (cont.) Indoor unit: Instantaneous heating water heater power supply 230 V~/400 V~ The mains connection is made in the 230 V~ junction ■ box. ■ The 230 V~ power supply can be 1-phase, 2-phase or 3-phase. ■...
  • Page 82 Installation sequence Power supply (cont.) Instantaneous heating water heater power supply 230 V~ Power supply 1-phase 2-phase 3-phase ? L2 ? L2 1x 1/N/PE 230 V/50 Hz 2x 1/N/PE 230 V/50 Hz 3x 1/N/PE 230 V/50 Hz Jumpers at terminals N1 to N3 Remove! In 3-phase network: Remove!
  • Page 83 Installation sequence Power supply (cont.) Instantaneous heating water heater power supply 400 V~ Power supply 2-phase 3-phase N L1 ? L2 ? L2 2/N/PE 400 V/50 Hz 3/N/PE 400 V/50 Hz Jumpers at terminals N1 to N3 Never remove! Never remove! Recommended power cable 5 x 2.5 mm 5 x 2.5 mm...
  • Page 84 Installation sequence Power supply (cont.) Connection version : With plug Fig. 59 Power supply plug Do not use wire ferrules. ■ ■ Shield the power cable from direct sunlight.
  • Page 85 Installation sequence Power supply (cont.) Only for outdoor unit with 2 fans Compressor power supply 230 V~ 400 V~ 1/N/PE 230 V/50 Hz 3/N/PE 400 V/50 Hz Recommended power cable Cable type H07RN-F H07RN-F ■ The use of PVC cable is not permis- The use of PVC cable is not permissi- sible.
  • Page 86 Installation sequence Power supply (cont.) Outdoor unit with 2 fans Compressor power 230 V~ 400 V~ supply 1/N/PE 230 V/50 Hz 3/N/PE 400 V/50 Hz Recommended power cable 3 x 2.5 mm 5 x 2.5 mm 3 x 4.0 mm Max.
  • Page 87 Mains power supply in conjunction with self-consumption For available connection diagrams for self-consump- tion via the integrated energy management system as well as further information: See link.viessmann.com/energymanagement. Fig. 61 Indoor unit: Close the 230 V~ junction box After completing all electrical connections, seal Torque for the screws: 2.8 Nm...
  • Page 88 Installation sequence Closing the outdoor unit (cont.) Fig. 62 2. Torque 5.0 +1.0 Nm...
  • Page 89 Commissioning, inspection, maintenance Steps - commissioning, inspection and maintenance Commissioning steps Inspection steps Maintenance steps Page • 1. Compiling reports......................90 • 2. Commissioning the system....................90 • 3. Filling the system....................... 96 • 4. Building up the system pressure..................100 •...

  • Page 90: Commissioning The System

    The indoor unit, the instantaneous heating water heater and the and the outdoor unit are connected to Note the mains supply. If an external CAN bus subscriber (Viessmann appli- If the heat pump is integrated into an external CAN ance) has already been commissioned beforehand, ■...

  • Page 91: Commissioning, Inspection, Maintenance

    Commissioning, inspection, maintenance Commissioning the system (cont.) 5. If other CAN bus subscribers are being commis- 6. Perform commissioning using the commissioning sioned at the same time: assistant or the ViGuide app: Start all other CAN bus subscribers. See chapter "Commissioning requirements". Commissioning steps 1.
  • Page 92 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Installation conditions of Installation conditions of outdoor unit: See installation information on page 24. outdoor unit Yes, installation condi- Continue commissioning with the outdoor unit. ■ tions are met No, continue with instan- Start up the system without the outdoor unit: ■...
  • Page 93 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Filling assistant System pressure Select the system pressure values. Set value Set value of the heating water side system pressure in bar ■ Range Tolerance range of the system pressure in bar: If this value deviates for a deter- ■...
  • Page 94 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Extensions Power-OFF and Smart Activation of power-OFF or Smart Grid: Grid Connection of floating contacts of the power supply utility (connections 143.4 and 143.5 in the 230 V~ junction box): See page 57. Not available Neither power-OFF nor Smart Grid is connected.
  • Page 95 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Profile A Temperature/time profile 1 (in acc. with EN 1264-4) ■ ϑ/°C Profile B Temperature/time profile 2 (in acc. with ZV parquet and flooring technology) ■ ϑ/°C Profile C Temperature/time profile 3 (in acc.

  • Page 96: Filling The System

    Commissioning, inspection, maintenance Commissioning the system (cont.) Remove these 3 labels. Stick the labels in the following Switch on the WiFi connection. Establish a connection places: to the router: ■ For commissioning, affix a label to the place marked ■ Information on WiFi: See chapter "WiFi operational on the type plate.
  • Page 97 Commissioning, inspection, maintenance Filling the system (cont.) Fill and top-up water Do not use antifreeze (e.g. water/glycol mixture) in the We recommend filling the entire system with potable heating water. quality water first. Please note Treat the heating water with one of the following Unsuitable fill and top-up water increases the options: level of deposits and corrosion.
  • Page 98 Commissioning, inspection, maintenance Filling the system (cont.) 4. Open the 3-way ball valves in the heating/cooling 5. Start the filling process in the commissioning assis- circuit 2 flow and return as shown in Fig. 64. tant. Allow the heating water to flow in via the fill hose. 6.
  • Page 99 Commissioning, inspection, maintenance Filling the system (cont.) Start filling the remaining consumer circuits: 4. Start the filling process in the commissioning assis- ■ For an indoor unit with 1 integrated heating/cooling tant. circuit, the filling starts automatically after "Filling" The filling of the 1st consumer circuit begins. has been called up in the commissioning assistant.
  • Page 100 Commissioning, inspection, maintenance Building up the system pressure Fig. 66 Filling the system with the filling function is completed. 6. As soon as the required system pressure has been The "Build up system pressure" function then starts reached, end the process in the commissioning automatically.

  • Page 101: Venting The System

    Commissioning, inspection, maintenance Building up the system pressure (cont.) 9. Thermally insulate the hydraulic connections. Activate system pressure function To activate this function, start the commissioning assis- See page 96. tant. Venting the system 3. The "Venting" function ends automatically. 1.
  • Page 102 Commissioning, inspection, maintenance Opening the heat pump (cont.) Opening the indoor unit Fig. 67...
  • Page 103 Commissioning, inspection, maintenance Opening the heat pump (cont.) Moving the programming unit to the maintenance position To facilitate certain maintenance tasks, move the ■ programming unit up or down, depending where it is located. ■ Do not disconnect the plug from the mounting panel. Do not alter where and how the cable is secured (fix- ing point of the cable tie).
  • Page 104 Commissioning, inspection, maintenance Opening the heat pump (cont.) Opening the outdoor unit See page 35. Checking the expansion vessel and system pressure ■ Use the calculation to DIN 4807-2 to check whether 2. If the pre-charge pressure of the expansion vessel the installed expansion vessel is adequate for the is lower than the static system pressure: Top up system water volume.
  • Page 105 Commissioning, inspection, maintenance Releasing the outdoor unit transport bracket (cont.) Fig. 69 To release the transport bracket securing screw with an Allen key (size 5), turning it fully to the right. Testing the refrigerant circuit Pressure equipment in the refrigerant circuit according to Pressure Equipment Direc- tive 2014/68/EU Outdoor unit with 1 fan Pipework...
  • Page 106 ■ Test the safety chain annually: Request information ■ Clean the cladding of the external panels and the about the test procedure from Viessmann Technical interior of the outdoor unit. Service. Clean the evaporator: See chapter "Cleaning the Replace the high pressure switch PSH at least every ■...
  • Page 107 Commissioning, inspection, maintenance Testing the refrigerant circuit (cont.) Please note Specialist personnel working on a refrigerant circuit Refrigerant can escape when working on the with flammable refrigerant are required to have specific refrigerant circuit. qualifications and certification: See "Safety informa- ■...

  • Page 108: Cleaning The Outdoor Unit Heat Exchanger (Evaporator)

    Commissioning, inspection, maintenance Checking that the fan in the outdoor unit can run freely Danger 1. Remove fan grille: See page 154. Contact with the fans while they are operating can result in serious cutting injuries. 2. Turn the fan by hand. ■...
  • Page 109 Commissioning, inspection, maintenance Cleaning the condensate pan and condensate drain Danger Danger If you touch live components or they come into Easily flammable liquids and materials (e.g. contact with water, this can result in serious naphtha/petrol, solvents, cleaning agents, paints injury due to electric shock.

  • Page 110: Checking The Indoor Unit Electrical Connections For Firm Seating

    Commissioning, inspection, maintenance Cleaning the condensate pan and condensate drain (cont.) Note The following information applies to outdoor units with 1 and 2 fans. The outdoor unit with 2 fans is shown as an example. Fig. 71 Apertures in the base plate Condensate pan Condensate drain 3.

  • Page 111: Resetting The High Limit Safety Cut-Out

    ■ For heating/cooling circuit 1, select the setting "0 %". Separate service instructions "System con- ■ For heating/cooling circuit 2, select the setting figuration and diagnosis for heat pumps with "50 %". Viessmann One Base"...
  • Page 112 Commissioning, inspection, maintenance Closing the heat pump Danger Please note The absence of system component earthing can Leaking hydraulic connections lead to appliance lead to serious injury from electrical current and damage. component damage in the event of an electrical ■...
  • Page 113 Commissioning, inspection, maintenance Closing the heat pump (cont.) Closing the indoor unit Fig. 73 Closing the outdoor unit See page 87.

  • Page 114: Adjusting The Heating Curve

    Commissioning, inspection, maintenance Checking the heat pump for noise Check indoor and outdoor units for unusual noises. Circulation pump operating noises ■ Vent again if required. ■ Vibration on the refrigerant lines Examples: ■ Fan operating noises Compressor operating noises ■...

  • Page 115: Service Menu

    Diagnosis and service checks Service menu Calling up the service menu Tap the following buttons: 4. Confirm with 1. " " 5. Select required menu. "Service" Note Not all menus will be available, depending on the 3. Enter password "viservice". system equipment level.
  • Page 116 Diagnosis and service checks Service menu (cont.) CD E Refrigerant circuit overview 28.7 °C 68 % 46.2 °C 44.7 °C 59 % 46 % 16 °C 43 % 14.8 °C 22.6 °C 41 % 48.9 °C 40 % 6.3 bar 26.6 °C 46.7 °C 54.2 °C...
  • Page 117 03. Enter password "viservice". 10. Confirm twice with 04. Confirm with Resetting all passwords to delivered condition Tap the following buttons: 5. Confirm with 1. Request the master password from Viessmann 6. "Change passwords" Technical Service. 7. "Reset all passwords" 2. " "...
  • Page 118 Diagnosis and service checks Checking outputs (actuator test) (cont.) 8. If required, tap to confirm. The functions are 9. Use to end the actuator test. active for 30 s. Note If necessary, use to switch to "Refrigerant cir- cuit overview". The following actuators can be controlled: Display Meaning...
  • Page 119 Diagnosis and service checks Checking outputs (actuator test) (cont.) Display Meaning DHW group Primary circuit pump, set Secondary pump (internal circulation pump) speed in % speed DHW circulation pump Start DHW circulation pump. Stop DHW circulation pump. 4/3-way valve position 4/3-way valve position in % Heating/cooling circuit 1 between 0 and 50 %...
  • Page 120 Troubleshooting Message display on the programming unit If there are messages pending in the system, the mes- sage and are displayed. The Lightguide flashes. Types of messages Meaning Status Operating message ■ No faults in system in normal operation ■ The cause of the message must be remedied.

  • Page 121: Troubleshooting Measures

    Troubleshooting Message display on the programming unit (cont.) The following information is displayed: 17 - 31 EM-EA1 extension (DIO electronics module) ■ Date and time of the occurrence of the fault 32 - 47 Cylinder module (M2IO electronics module) ■ Fault code SDIO/SM1A electronics module ■...
  • Page 122 Replace the inverter if there is a defect. Refrigerant can escape when working on the Replace faulty components only with genuine ■ refrigerant circuit. Viessmann spare parts. ■ It is essential that regulations and guidelines on handling refrigerant are always observed and adhered to: See "Safety information".

  • Page 123: Overview Of Electrical Components

    Indoor unit maintenance Overview of electrical components See page 49 onwards. Removing the programming unit and electronics module Danger Danger Contact with live components can lead to seri- The absence of system component earthing can ous injury from electric current. Some compo- lead to serious injury from electrical current and nents on PCBs remain live even after the power component damage in the event of an electrical...
  • Page 124 Indoor unit maintenance Removing the programming unit and electronics… (cont.) Removing the HMI programming unit Replacing the HMI programming unit connecting cable Please note Incorrect routing of the connecting cable can lead to heat damage and impairment of the EMC properties. Position and secure the connecting cable (fixing point of the cable tie) according to the "HMI con- necting cable"...
  • Page 125 Indoor unit maintenance Removing the programming unit and electronics… (cont.) Removing the HPMU electronics module Remove programming unit: See previous chapter. After replacing the HPMU electronics module, repeat the commissioning procedure: See chapter "Commis- sioning". 2. 2x Fig. 77 Removing the EHCU electronics module Danger Remove programming unit: See chapter "Removing Contact with live components can lead to seri-...
  • Page 126 Indoor unit maintenance Removing the programming unit and electronics… (cont.) Fig. 78 Note No recommissioning is necessary following replace- ment of the EHCU electronics module.

  • Page 127: Overview Of Internal Components

    Indoor unit maintenance Overview of internal components Indoor unit with 1 integral heating/cooling circuit Fig. 79 Integrated buffer cylinder Return temperature sensor Expansion vessel 4/3-way valve High limit safety cut-out (STB), instantaneous Flow sensor heating water heater Secondary pump Pressure sensor Instantaneous heating water heater Flow temperature sensor Safety valve...
  • Page 128 Indoor unit maintenance Overview of internal components (cont.) Indoor unit with 2 integral heating/cooling circuits Fig. 80 Integrated buffer cylinder 4/3-way valve Expansion vessel Flow sensor High limit safety cut-out (STB), instantaneous Heating/cooling circuit 1 heating circuit pump heating water heater Instantaneous heating water heater Pressure sensor Safety valve...
  • Page 129 Indoor unit maintenance Draining the indoor unit on the secondary side (cont.) Fig. 81 3. Set the 4/3-way valve in turn to , and until water no longer comes out. Removing hydraulic components and EPP insulating parts When replacing hydraulic components and EPP insu- Danger lating parts, first fold out or remove electrical compo- Residual water will escape when the indoor unit...
  • Page 130 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Overview of torque settings for assembly Union nuts: Please note 1 Nm Filling and venting the system with the transport ½ ± 2 Nm bracket loose can cause damage to the outdoor ¼...
  • Page 131 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the integrated buffer cylinder 50 ± 2 Nm Fig. 82...
  • Page 132 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing hydraulic lines from the integral buffer cylinder Indoor unit with 1 integrated heating/cooling circuit Removing the hydraulic line at the front 50 ± 2 Nm Fig. 83...
  • Page 133 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the hydraulic line at the back 50 ± 2 Nm Fig. 84...
  • Page 134 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Indoor unit with 2 integrated heating/cooling circuits Removing the integrated buffer cylinder return line 50 ± 2 Nm Fig. 85...
  • Page 135 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the integrated buffer cylinder flow line 50 ± 2 Nm Fig. 86...
  • Page 136 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the expansion vessel 12 ± 1 Nm 3.5 +0.5 Nm Fig. 87...
  • Page 137 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Additionally for indoor unit with 1 integrated heating/cooling circuit ~25° Fig. 88 Note Only required for the removal of the hydraulic block...
  • Page 138 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the instantaneous heating water heater Fig. 89 Torque for the screws on the 230 V~ junction box: 2.8 Nm...
  • Page 139 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Fig. 90 Observe the colour coding of the core wires connected to the high limit safety cut-out (as per IEC 60757): BK Black RD Red WH White...
  • Page 140 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the sensors Removing the flow sensor 70 ±2 Nm Fig. 91...
  • Page 141 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the secondary circuit temperature sensors Fig. 92...
  • Page 142 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Additionally for indoor unit with 2 integrated heating/cooling circuits Fig. 93...
  • Page 143 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the pressure sensor Fig. 94...
  • Page 144 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the circulation pump head Fig. 95 Torque settings Torque settings for the circuit pump union nuts: ■ 2 Nm ± Torque for the screws on the pump head: ■ 1 Nm ±...
  • Page 145 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) 6x/8x 6x/8x 2.8 ± 0.3 Nm Fig. 96 Removing the additional EPP insulation pieces After removal of the hydraulic block, all other EPP installation pieces can be replaced.
  • Page 146 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Fig. 97 Status display, internal circulation pumps Meaning flashes Normal operation, circulation pump green. runs on demand. lights up Circulation pump runs continuously ■ green. with maximum output, e.g. when the PWM signal is interrupted. No fault message ■...

  • Page 147: Checking The Temperature Sensors

    Indoor unit maintenance Checking the temperature sensors Temperature sensor NTC 10 k Connection Ω Outside temperature sensor 6-pole connection socket on the underside of the ap- ■ ■ pliance, terminals 11 and 12 Plug 1 on the HPMU electronics module ■...
  • Page 148 Indoor unit maintenance Checking the temperature sensors (cont.) Viessmann NTC 10 k (blue marking) Ω / °C R / k / °C R / k / °C R / k / °C R / k / °C R / k / °C R / k...

  • Page 149: Checking The Fuse

    Indoor unit maintenance Checking the pressure sensors 0.45 Pressure Fig. 99 Checking the fuse Fuse F1 is located in the HPMU electronics module: 2. Open the HPMU electronics module. See page 61. 3. Check the fuse. Replace if required. Fuse type: ■...
  • Page 150 Outdoor unit maintenance Removing the outer casing The steps are shown using the example of the outdoor unit with 2 fans. ■ The procedure for the outdoor unit with 1 fan is iden- tical. ■ Fitting the outer casing: Carry out the steps in the reverse order.
  • Page 151 Outdoor unit maintenance Removing the outer casing (cont.) Removing the right-hand side casing Fig. 100...
  • Page 152 Outdoor unit maintenance Removing the outer casing (cont.) When fitting the right side panel, make sure it is positioned correctly: Fig. 101 Removing the top casing 1. Remove side casing, right: See Fig. 100.

  • Page 153: Removing The Outer Casing

    Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 102 Cover EPP support Air space cover Cover with gasket and sound insulation...
  • Page 154 Outdoor unit maintenance Removing the outer casing (cont.) Removing the front casing TX 25 Fig. 103 Only for outdoor unit with 2 fans: Upper fan grille Reinforcing strut Lower fan grille...
  • Page 155 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 104 Only for outdoor unit with 2 fans: Design grille, top Design grille, bottom For removal of the front panel: 7. Remove top cover: See Fig. 102. 6. Remove side casing, right: See Fig. 100.
  • Page 156 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 105 Front panel Removing the left-hand side casing 1. Remove side casing, right: See Fig. 100. 3. Remove fan grilles and reinforcing strut: See Fig. 103. 2. Remove top cover: See Fig. 102.
  • Page 157 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 106 Evaporator Removing the rear casing 1. Remove side casing, right: See Fig. 100. 2. Remove top cover: See Fig. 102.
  • Page 158 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 107 Evaporator Back panel Overview of electrical components Danger Danger Contact with live components can lead to seri- The absence of system component earthing can ous injury from electric current. Some compo- lead to serious injury from electrical current and nents on PCBs remain live even after the power component damage in the event of an electrical...
  • Page 159 Outdoor unit maintenance Overview of electrical components (cont.) Outdoor unit with 1 fan Terminal strip, 230 V~ function components Fan terminal with fuse 6.3 A H (slow), 250 V~ Electronics terminal with fuse 6.3 A H (slow), 250 V~ Chokes VCMU refrigerant circuit controller Solenoid coil, 4-way diverter valve Ferrite...
  • Page 160 6.3 A H (slow), 250 V~ VCMU refrigerant circuit controller VCMU refrigerant circuit controller Coil, 4-way diverter valve Coil, 4-way diverter valve Inverter Inverter Checklist for maintenance work Note Work on the refrigerant circuit must only be carried out by Viessmann Technical Services employees.
  • Page 161 AG145 and CuP 281a may be used. These are issued by an organisation with industry accreditation. used by Viessmann and comply with ISO 17672. This certificate confirms their competence in the safe ■...
  • Page 162 & Any replacement electrical components must be suitable for the ■ application and must correspond to the manufacturer’s specifi- cation. Only replace faulty components with genuine Viessmann spare parts. Carry out all component replacements in accordance with Viess- ■ mann guidelines. If required, consult Viessmann Technical Serv- ice.
  • Page 163 In areas where flammable atmospheres exist, only apply voltage ■ to components which are suitable for flammable atmospheres. Only use Viessmann original parts or parts approved by Viess- ■ mann. Other parts may result in refrigerant becoming ignited in the event of a leak.
  • Page 164 Outdoor unit maintenance Checklist for maintenance work (cont.) Measure Completed Comments Leak detection The following leak detection processes are suitable for appliances with flammable refrigerant: Leak detection with electronic refrigerant detectors: Electronic refrigerant detectors may not have the required sensi- ■...
  • Page 165 Outdoor unit maintenance Overview of internal components Danger Contact with live components can lead to seri- ous injury from electric current. Some compo- nents on PCBs remain live even after the power supply has been switched off. When working on the outdoor unit, isolate the ■...
  • Page 166 Outdoor unit maintenance Overview of internal components (cont.) Compressor Liquid gas temperature sensor, heating Electronic expansion valve 1 Schrader valve, high pressure side 1 Oil sump temperature sensor Accumulator Compressor temperature sensor, compressor High pressure switch PSH Ball valve with filter High pressure sensor Non-return valve Low pressure sensor...
  • Page 167 Outdoor unit maintenance Overview of internal components (cont.) Compressor accumulator Oil sump temperature sensor Liquid gas temperature sensor, cooling Compressor temperature sensor, compressor Schrader valve, low pressure side Schrader valve, high pressure side 1 Electronic expansion valve 2 Ball valve with filter Float air vent valve with quick-action air vent valve Non-return valve 4-way diverter valve...
  • Page 168 Outdoor unit maintenance Refrigerant circuit flowchart (cont.) Heating mode Fig. 113 Evaporator Interior temperature sensor Air discharge Suction gas temperature sensor, evaporator Air intake temperature sensor 4-way diverter valve Air intake High pressure sensor Electronic expansion valve 1 High pressure switch PSH Liquid gas temperature sensor, heating Hot gas temperature sensor Schrader valve, high pressure side 2...

  • Page 169: Cooling Mode

    Outdoor unit maintenance Refrigerant circuit flowchart (cont.) Cooling mode Fig. 114 Evaporator Interior temperature sensor Air discharge Suction gas temperature sensor, evaporator Air intake temperature sensor 4-way diverter valve Air intake High pressure sensor Electronic expansion valve 1 High pressure switch PSH Liquid gas temperature sensor, heating Hot gas temperature sensor Schrader valve, high pressure side 2...
  • Page 170 Outdoor unit maintenance Extracting the refrigerant (cont.) Also take into account the following points: 06. Extract the refrigerant from all parts of the refriger- ■ Only extraction equipment authorised for R290 (pro- ant circuit using the extraction equipment. If nec- pane) that has been regularly inspected may be essary, open the electronic expansion valves with used.

  • Page 171: Filling The Refrigerant Circuit

    Outdoor unit maintenance Extracting the refrigerant (cont.) 14. Once the refrigerant has been completely evacu- 15. Affix a label to the outdoor unit in a clearly visible ated, close the Schrader valves so they are gas- position, containing the following information, with tight.
  • Page 172 Outdoor unit maintenance Filling the refrigerant circuit (cont.) 6. Affix a label to the heat pump in a clearly visible 8. Seal the sealing caps of the low pressure and high position, containing the following information, with pressure Schrader valves: See "Outdoor unit main- date and signature: tenance: Overview of internal components".
  • Page 173 Outdoor unit maintenance Removing the hydraulic components (cont.) Removing the float air vent valve with quick-action air vent valve G 1¼ 50 ± 2 Nm 7 ± 1 Nm G 1¼ 20 ± 2 Nm 7 ± 1 Nm Fig. 116 Stainless steel float air vent valve Plastic float air vent valve...
  • Page 174 Outdoor unit maintenance Removing the hydraulic components (cont.) Removing the ball valve with filter G 1¼ 50 ± 2 Nm Fig. 117 Checking the temperature sensors Temperature sensors are connected to the VCMU refrigerant circuit controller in the outdoor unit. Temperature sensor NTC 10 k Connection Ω...
  • Page 175 Outdoor unit maintenance Checking the temperature sensors (cont.) NTC 10 k (no marking) Ω / °C R / k / °C R / k / °C R / k / °C R / k / °C R / k / °C R / k ϑ...

  • Page 176: Checking The Fuses

    Outdoor unit maintenance Checking the pressure sensors Pressure Fig. 118 Low pressure sensor High pressure sensor Checking the fuses The fuses are located next to the VCMU refrigerant cir- 1. Switch off the power supply. cuit controller: See page 158. 2.
  • Page 177 Commissioning/service reports Commissioning/service reports Hydraulic parameter report Settings and test values Set value Commissioning Maintenance/ service Check external heating/cooling circuit pumps Circulation pump type Circulation pump stage Primary circuit commissioning Air intake temperature °C Air discharge temperature °C Temperature differential (air intake/ discharge) Δ...
  • Page 178 Specification Specification Heat pumps with 400 V~ outdoor unit Type AWO-E-AC 251.A/AWO-E-AC-AF 251.A 10 2C 13 2C Heating performance data to EN 14511 (A2/W35) Rated heating output Fan speed Power consumption 1.31 1.68 Coefficient of performance (COP) in heating mode 4.46 3.98 ε...

  • Page 179: Specification

    Specification Specification (cont.) Type AWO-E-AC 251.A/AWO-E-AC-AF 251.A 10 2C 13 2C Seasonal energy efficiency ratio SEER Air intake temperature Cooling mode Min. °C ■ Max. °C ■ Heating mode Min. °C – – ■ Max. °C ■ Heating water (secondary circuit) Capacity excl.
  • Page 180 Specification Specification (cont.) Type AWO-E-AC 251.A/AWO-E-AC-AF 251.A 10 2C 13 2C Mobile data transfer WiFi Transfer standard IEEE 802.11 IEEE 802.11 ■ b/g/n b/g/n Frequency range 2000 to 2483.5 2000 to 2483.5 ■ Max. transmission power ■ Low power radio Transfer standard IEEE 802.15.4 IEEE 802.15.4...
  • Page 181 Specification Specification (cont.) Type AWO-E-AC 251.A/AWO-E-AC-AF 251.A 10 2C 13 2C Total weight Indoor unit with 1 integrated heating/cooling circuit Empty ■ Filled (max.) ■ Indoor unit with 2 integrated heating/cooling circuits Empty ■ Filled (max.) ■ Outdoor unit Permissible operating pressure on the secondary side Connections with connection pipes supplied Heating water flow/return, heating/cooling circuits or external buffer Cu 28 x 1.0...
  • Page 182 Specification Specification (cont.) Heat pumps with 230 V~ outdoor unit Type AWO-M-E-AC 251.A/ AWO-M-E-AC-AF 251.A 04 2C 06 2C 08 2C 10 2C 13 2C Heating performance data to EN 14511 (A2/W35) Rated heating output Fan speed Power consumption 0.63 0.78 1.08 1.31...
  • Page 183 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ AWO-M-E-AC-AF 251.A 04 2C 06 2C 08 2C 10 2C 13 2C Performance data – cooling average cli- matic conditions (A35/W18) Rated cooling capacity P 8.96 10.65 rated Seasonal energy efficiency ratio SEER Performance data – cooling average cli- matic conditions (A35/W7) Rated cooling capacity P 2.95...
  • Page 184 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ AWO-M-E-AC-AF 251.A 04 2C 06 2C 08 2C 10 2C 13 2C Max. power consumption 2 x 140 2 x 140 Outdoor unit Integral circulation pumps (PWM) 1 heating/cooling circuit ■ 2 heating/cooling circuits ■...
  • Page 185 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ AWO-M-E-AC-AF 251.A 04 2C 06 2C 08 2C 10 2C 13 2C Outdoor unit dimensions Total length Total width 1144 1144 1144 1144 1144 Total height 1382 1382 Indoor unit dimensions Total length Total width With 1 integrated heating/cooling ■...
  • Page 186 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ AWO-M-E-AC-AF 251.A 04 2C 06 2C 08 2C 10 2C 13 2C Energy efficiency class to Com- mission Regulation (EU) No 813/2013 Heating, average climatic conditions Low temperature application ■ (W35) Medium temperature application ■...
  • Page 187 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ 04 SP 06 SP 08 SP 10 SP 13 SP AWO-M-E-AC-AF 251.A 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Heating performance data to EN 14511 7/W35) –...
  • Page 188 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ 04 SP 06 SP 08 SP 10 SP 13 SP AWO-M-E-AC-AF 251.A 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Heating water (secondary circuit) Capacity excl. expansion vessel Heat pump circuit minimum flow rate 1000 1000...
  • Page 189 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ 04 SP 06 SP 08 SP 10 SP 13 SP AWO-M-E-AC-AF 251.A 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Mobile data transfer WiFi Transfer standard IEEE IEEE IEEE IEEE...
  • Page 190 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ 04 SP 06 SP 08 SP 10 SP 13 SP AWO-M-E-AC-AF 251.A 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Indoor unit dimensions Total length Total width With 1 integrated heating/cooling ■...
  • Page 191 Specification Specification (cont.) Type AWO-M-E-AC 251.A/ 04 SP 06 SP 08 SP 10 SP 13 SP AWO-M-E-AC-AF 251.A 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Heating performance data to Com- mission Regulation (EU) No.

  • Page 192: Final Decommissioning And Disposal

    Preferred appointment: Date Time Date Time The work requested from Viessmann will be billed to me/us in accordance with the latest Viessmann pricelist. Place/date Signature Final decommissioning and disposal Viessmann products can be recycled. Components Isolate the system from the power supply for decom- and substances from the system are not part of ordi- missioning.
  • Page 193 Appendix Final decommissioning and disposal (cont.) Note If the outdoor units dismantled for disposal are not ■ Before commencing decommissioning, note the stored in accordance with the positioning require- "Checklist for maintenance work" on page 160. ments, the following steps must be carried out: ■...
  • Page 194 Ordering individual parts Ordering individual parts for accessories Please affix accessory labels with part numbers here. Please specify the relevant part no. when ordering individual parts.

  • Page 195: Declaration Of Conformity

    Certificates Declaration of conformity We, Viessmann Climate Solutions SE, D-35108 Allen- dorf, declare as sole responsible body that the named product complies with the European directives and supplementary national requirements in terms of its design and operational characteristics. Viessmann Cli-...
  • Page 196 Keyword index Keyword index Connection Accumulator............. 168, 169 – Electric..............47 Actuator test............. 117 – Electrical components..........47 Air discharge.............. 29 – Overview..............16 Air intake..............29 – Secondary circuit.............41 Air intake temperature......179, 183, 187 Connection, indoor/outdoor unit......... 72 Air intake temperature sensor......168, 169 Connection cables............47 Air short circuit............

  • Page 197: Keyword Index

    Keyword index Keyword index (cont.) Energy efficiency class......181, 186, 190 EPP insulating parts..........129 Heat exchanger cleaning......... 108 EPP insulation pieces..........145 Heating circuit pump..........128 Evaporator........165, 166, 168, 169 Heating curve............114 Evaporator air intake temperature......116 Heating water........... 179, 183, 188 Expansion vessel..........
  • Page 198 Keyword index Keyword index (cont.) Intended use.............. 12 Outdoor unit Interior temperature sensor......168, 169 – Cable lengths............47 Internal components.........127, 165 – Cleaning..............108 Internet, connecting............95 – Dimensions....... 19, 20, 180, 185, 189 Inverter............. 168, 169 – Electrical connections, checking......111 IP addressing.............
  • Page 199 Keyword index Keyword index (cont.) Programming unit Sealed enclosures............163 – Fitting..............66 Seal rings, replacing.........100, 104, 129 – Moving to top............67 Secondary circuit – Removing.............. 124 – Connection.............. 41 Programming unit, opening........123 – Draining..............128 Protective equipment..........170 Secondary pump............127 Protective gloves............106 Security parameters...........
  • Page 200 Working environment..........161 Wall mounting.............35 – Bracket set.............. 34 – Indoor unit............... 40 – Outdoor unit............34 Water quality.............. 97 Viessmann Climate Solutions SE Viessmann Limited 35108 Allendorf / Germany Hortonwood 30, Telford Telephone: +49 6452 70-0 Shropshire, TF1 7YP, GB...

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