Viessmann Vitocal 252-A Series Installation And Service Instructions Manual

Air source heat pump, monoblock version for heating and cooling operation

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Service instructions manual (200 pages)

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VIESMANN

Installation and service instructions

for contractors

Vitocal 252-A

Type AWOT(-M)-E-AC/AWOT(-M)-E-AC-AF 251.A

Air source heat pump, monoblock version for heating and cooling operation, with

1 integrated heating/cooling circuit

Type AWOT(-M)-E-AC/AWOT(-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 252-A

Please keep safe.

6222080 GB

1/2024

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Summary of Contents for Viessmann Vitocal 252-A Series

Page 1 VIESMANN Installation and service instructions for contractors Vitocal 252-A Type AWOT(-M)-E-AC/AWOT(-M)-E-AC-AF 251.A Air source heat pump, monoblock version for heating and cooling operation, with 1 integrated heating/cooling circuit Type AWOT(-M)-E-AC/AWOT(-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 252-A Please keep safe.
Page 2 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 (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 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 For installation and replacements, Seal the pipe entry to the building ■ use only Viessmann original parts using the most suitable current or spare parts approved by technology. Route the pipes into Viessmann.
Page 7 Safety instructions Safety instructions (cont.) From a safe position, switch off the Danger ■ electricity supply for all system compo- If water escapes from the appli- nents. ance, there is a risk of scalding. Remove ignition sources from the dan- Never touch hot heating water.
Page 8 Safety instructions Safety instructions (cont.) Danger Temperature range for storage: 25 °C – ■ Escaping refrigerant can lead to fire to 70 °C and explosions that result in very Only store the outdoor unit in its ex- ■ serious injuries or death. There is a factory protective packaging.
Page 9 Index Index 1. Information Disposal of packaging ................13 Symbols ....................13 Intended use ..................13 Product information ................14 Layout and functions ................14 ■ System examples ................16 ■ Maintenance parts and spare parts ............ 16 ■ 2. Preparing for installation Requirements for on-site connections ...........
Page 10 Terminal area 230 V~/400 V~ ............. 71 ■ HPMU electronics module: Accessory 230 V~ and BUS connection . 75 ■ Connecting with other Viessmann appliances via the CAN bus ..77 ■ Connecting the energy meter ............. 78 ■ Fitting the programming unit ............... 79 ■...
Page 11 ■ Removing the circulation pump head ..........150 ■ Status display, internal circulation pumps ..........150 Checking the temperature sensors ............151 Viessmann NTC 10 k (blue marking) ..........152 ■ Ω Checking the water pressure sensor ............. 153 Checking the fuse .................. 153 Outdoor unit maintenance Removing the outer casing ..............
Page 12 Index Index (cont.) 15. Ordering individual parts Ordering individual parts for accessories ..........203 16. Certificates Declaration of conformity ............... 204 17. Keyword index ........................205...
Page 13 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 14 Information Intended use (cont.) The range of functions can be extended with additional Incorrect usage or operation of the appliance (e.g. the components and accessories. appliance being opened by the system user) is prohibi- ted and will result in an exclusion of liability. Incorrect Intended use presupposes that a fixed installation in usage also occurs if the components in the heating conjunction with permissible, system-specific compo-...
Page 15 Information Product information (cont.) Indoor unit with 2 integral heating/cooling circuits Note DHW is always heated by the heat pump or the instan- 1 or 2 heating/cooling circuits without mixer can be taneous heating water heater installed in the indoor connected to the heat pump.
Page 16 Available Accessories Control unit/PCB, indoor unit Integral Outdoor unit Instantaneous heating water heater System examples Available system examples: www.viessmann-schemes.com Maintenance parts and spare parts Maintenance parts and spare parts can be identified and ordered directly online. Viessmann Partnershop Login: https://shop.viessmann.com/...
Page 17 Information Product information (cont.) Viessmann spare part app www.viessmann.com/etapp...
Page 18 Preparing for installation Requirements for on-site connections Indoor unit with 1 integrated heating/cooling circuit A B C D E F Fig. 2 Secondary circuit flow (heating/cooling circuit 1/ Heating water to outdoor unit, connection Cu 28 x external buffer cylinder), connection Cu 28 x 1.0 mm 1.0 mm DHW, connection Cu 22 x 1.0 mm...
Page 19 Preparing for installation Requirements for on-site connections (cont.) Indoor unit with 2 integrated heating/cooling circuits A B C D E F Fig. 3 Heating/cooling circuit 1 flow, connection Cu 28 x Heating water to outdoor unit, connection Cu 28 x 1.0 mm 1.0 mm Cold water, connection Cu 22 x 1.0 mm...
Page 20 Preparing for installation Requirements for on-site connections (cont.) Heating/cooling circuit 2 flow, connection Cu 28 x 1.0 mm Heating/cooling circuit 2 return, connection Cu 28 x 1.0 mm Outdoor unit with 1 fan 1144 Fig. 4 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)
Page 21 Preparing for installation Requirements for on-site connections (cont.) Outdoor unit with 2 fans, types ...A10 to A13 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 22 Preparing for installation Requirements for on-site connections (cont.) Outdoor unit with 2 fans, types ...A16 to A19 1144 Fig. 6 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 23 Siting the outdoor unit Storing the outdoor unit Please note Storing the outdoor unit for more than 12 months may damage the ball bearing of the fan motor. ■ Do not store the outdoor unit for more than 12 months before commissioning. Do not shut down the outdoor unit for more ■...
Page 24 Siting the outdoor unit Transporting the outdoor unit (cont.) Handling using transport aids Danger The transport aids are each found in the mounting rail If the transport aids are damaged, the outdoor under the outdoor unit: unit may fall. This can lead to refrigerant circuit ■...
Page 25 Siting the outdoor unit Transporting the outdoor unit (cont.) 2. Use the transport aids to lift and transport the out- Removing the transport aids door unit. Wear personal protective equipment, e.g. protective gloves and safety shoes. After handling, remove all transport aids. Fig.
Page 26 Siting the outdoor unit Transporting the outdoor unit (cont.) 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. Should damage ■...
Page 27 Siting the outdoor unit Installation information (cont.) Floorstanding installation Particularly in adverse climatic environments (minus If the support cannot be used, site the outdoor unit ■ ■ temperatures, snow and humidity) a distance to the on a concrete foundation 150 mm high using an ≥...
Page 28 Siting the outdoor unit Installation information (cont.) Siting In accordance with EN 378-3, the outdoor unit may Provide equipment for the protection of the outdoor ■ ■ only be installed in the open air. unit against mechanical damage e.g. Impact damage ■...
Page 29 Siting the outdoor unit Installation information (cont.) Floorstanding installation: Flat roof installation: ■ Ensure that condensate can drain freely. ■ Allowing the condensate to drain freely onto the roof ■ Allow condensate to seep away into a gravel bed or surface is not permissible, as this may result in the into a deep seepage layer, or direct it into the waste formation of layers of ice.
Page 30 Siting the outdoor unit Installation location (cont.) If siting the appliance in a location that is exposed to Maintain a clearance of at least 3 m to pathways, ■ ■ wind, ensure that the wind cannot influence the fan downpipes or sealed surfaces. The cooled air in the area.
Page 31 Siting the outdoor unit Installation location (cont.) Freestanding positioning of the outdoor unit Corner positioning of the outdoor unit, right Fig. 10 2894 Safety zone Siting the outdoor unit in front of an external wall 1000 Fig. 12 3144 Safety zone 3144 Corner positioning of the outdoor unit, left Fig.
Page 32 Siting the outdoor unit Minimum clearances 1000 Fig. 14 Air intake Clearance between wall and outdoor unit depend- Air discharge ent on line routing: Line entry above ground level: ■ 250 mm ≥ ■ Line entry below ground level when laying the Quattro connection line in a straight trench: 940 mm ≥...
Page 33 Siting the outdoor unit Condensate drain (cont.) Draining condensate via drain pipe in seepage Draining condensate via waste water system layer Fig. 16 Fig. 15 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 34 Siting the outdoor unit Floorstanding installation (cont.) Fig. 17 Fig. 18 Frost protection for foundations: compacted Fixing points for support: crushed stone (e.g. 0 to 32/56 mm); thickness of Use ground anchors with a tensile force of at layer subject to local requirements and building least 2.5 kN.
Page 35 Siting the outdoor unit Floorstanding installation (cont.) Wall a, b For line entries below ground level only: See the Flexible separating layer between the foundations following tables. and the wall, in accordance with local require- Bending radius ments and the standard rules of building engi- neering Installation with support for floorstanding installa- tion (accessories)
Page 36 Siting the outdoor unit Floorstanding installation (cont.) Fig. 20 Frost protection for the foundations: Compacted Air discharge crushed stone, e.g. 0 to 32/56 mm; thickness of Wall layer subject to local requirements and building Flexible separating layer between the foundations regulations and the wall, in accordance with local require- Foundation strip of reinforced concrete...
Page 37 Siting the outdoor unit Floorstanding installation (cont.) Installation instructions for anti-vibration base ■ Align the anti-vibration base horizontally on the foun- dation using the spirit levels supplied. ■ Use tension rods with a tensile force of at least 1.25 kN per fixing point. Drill holes at the markings based on the nominal ■...
Page 38 Siting the outdoor unit Floorstanding installation (cont.) Support for floorstanding installation (accessories) Connection set, floorstanding installation (accesso- ries) Indoor/outdoor unit CAN bus communication cable and outdoor unit power cable: Route the cables free of strain. For free drainage of condensate: Gravel bed as soakaway Ring seal (accessories) Quattro connection line laid underground (acces-...
Page 39 Siting the outdoor unit Floorstanding installation (cont.) 3000 Fig. 23 Fig. 24 Ground Pathway, patio Support for floorstanding installation (accessories) Connection set, floorstanding installation (accesso- ries) Indoor/outdoor unit CAN bus communication cable and outdoor unit power cable: Route the cables free of strain. For free drainage of condensate: Gravel bed as soakaway Ring seal (accessories)
Page 40 Siting the outdoor unit Floorstanding installation (cont.) Further installation instructions for the Quat- Note tro connection line ■ Provide thermal insulation of sufficient thickness on Separate installation instructions the pipework to the outdoor air: See table on page 28. ■ Protect the pipework against damage.
Page 41 Siting the outdoor unit Floorstanding installation (cont.) Note ■ Provide thermal insulation of sufficient thickness on the pipework to the outdoor air: See table on page 28. ■ Protect the pipework against damage. Avoid trip haz- ards. Wall mounting: Only permissible for types ...A04 to A13 Installation should only be performed with the bracket Danger set for wall mounting (accessories).
Page 42 Siting the outdoor unit Wall mounting: Only permissible for types… (cont.) Condensate drain in the base plate: Do not seal the opening. Bracket for wall mounting (accessories), illustration without design casing (accessories) Note For the exact location of the drill holes for the wall ■...
Page 43 Installing the indoor unit Transporting the indoor unit Please note Impacts, compression and tensile loads can cause damage to the outside panels of the appliance. Never apply loads/weight to the top, front or side panels of the appliance. Splitting the indoor unit To facilitate handling in confined spaces, the hydraulic unit can be separated from the DHW cylinder.
Page 44 Installing the indoor unit Transporting the indoor unit (cont.) Fig. 27...
Page 45 Installing the indoor unit Transporting the indoor unit (cont.) Fig. 28 Transport protection...
Page 46 Installing the indoor unit Transporting the indoor unit (cont.) Fig. 29 Requirements for the installation room Danger Please note Dust, gases and vapours can be damaging to An unfavourable indoor environment can lead to health and trigger explosions. malfunctions and appliance damage. Prevent dust, gases and vapours in the installa- ■...
Page 47 Installing the indoor unit Requirements for the installation room (cont.) WiFi operational reliability and system requirements The appliance is equipped with an integral WiFi com- Wireless signals are isolated by service ducts and ■ munication module. This WiFi communication module lift shafts.
Page 48 Installing the indoor unit Requirements for the installation room (cont.) Ideal angle of penetration Fig. 31 WiFi router Heat generator Wall Minimum clearances Secondary circuit connections, left/top Secondary circuit connections, right/top Fig. 32 Fig. 33...
Page 49 Installing the indoor unit Minimum room height Note Remove the packaging upwards before positioning. Fig. 34 Indoor unit with integral DHW cylinder Finished floor level or top edge of platform for unfinished floors Pressure points Note ■ Observe the permissible floor load. Ø...
Page 50 Installing the indoor unit Pressure points (cont.) The total weight of the indoor unit with filled DHW ■ cylinder and 1 integral heating/cooling circuit is 386 kg. Each pressure point (each with an area of 3217 mm ) is subject to a load of up to 96.5 kg. The total weight of the indoor unit with filled DHW ■...
Page 51 Hydraulic connections Hydraulic connection of the outdoor unit Opening the outdoor unit Note The following information for opening the outdoor unit applies to outdoor units with 1 or 2 fans. The outdoor unit with 2 fans is shown as an example. Fig.
Page 52 Hydraulic connections Hydraulic connection of the outdoor unit (cont.) Connecting the hydraulic connection lines Connect the connection lines of the hydraulic connec- Requirements to be met by on-site lines tion set (accessories) to the underside of the outdoor unit using either copper pipe or corrugated stainless Requirements to be met, e.g.
Page 53 Hydraulic connections Hydraulic connection of the outdoor unit (cont.) Fig. 38 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 54 Hydraulic connections Hydraulic connection of the indoor unit (cont.) M N F K L Fig. 39 Expansion vessel, suitable for drinking water Pressure gauge connection Visible discharge pipe outlet point Non-return valve/pipe separator Safety valve Cold water Automatic thermostatic mixing valve Drinking water filter Pressure reducer to DIN 1988-200:2012-05 Shut-off valve...
Page 55 Hydraulic connections Hydraulic connection of the indoor unit (cont.) Note Indoor unit with 1 integrated heating/cooling cir- So that the system can be filled and flushed via the cuit commissioning assistant, fit a 3-way ball valve in each of the following lines: ■...
Page 56 Hydraulic connections Hydraulic connection of the indoor unit (cont.) Indoor unit with 2 integrated heating/cooling cir- 2. Connect all secondary side hydraulic lines (room cuits heating/cooling, DHW heating) to the indoor unit. Please note Hydraulic connections subjected to mechani- cal loads lead to leaks, vibrations and appli- ance damage.
Page 57 Hydraulic connections Hydraulic connection of the indoor unit (cont.) 6. Connect the drain hose from the safety valve to the waste water system with a fall and an atmospheric pipe vent in accordance with EN 12828, e.g. via a drain outlet or waste water inlet. ■...
Page 58 Hydraulic connections Hydraulic connection of the indoor unit (cont.) Contact humidistat For area cooling systems (e.g. underfloor heating cir- Systems with external buffer cylinder cuit, chilled ceiling), a contact humidistat (accessories) is required. Heating/cooling circuits 1, 2, 3 and 4: ■...
Page 59 Hydraulic connections Hydraulic connection of the indoor unit (cont.) The two 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 the following illustration. Fig.
Page 60 Hydraulic connections Hydraulic connection of the indoor unit (cont.) Aligning the indoor unit SW17 Fig. 44...
Page 61 Electrical connections Preparing the electrical connections Cables ■ For cable lengths and cable cross-sections: See the following tables. ■ For accessories: Cables with the required number of cores for exter- nal connections. Prepare an on-site distribution box. Cable lengths in the indoor unit Connection cables Cable lengths in the indoor unit 230 V~, e.g.
Page 62 Electrical connections Electrical connection of the indoor unit Indoor unit: Removing the front panels Fig. 45...
Page 63 Electrical connections Electrical connection of the indoor unit (cont.) Relocating the ON/OFF switch Depending on the installation situation, the ON/OFF Open the electrical wiring chamber of the HPMU. Dis- switch can be installed either on the right or the left connect the cable of the ON/OFF switch and remove.
Page 64 Electrical connections Electrical connection of the indoor unit (cont.) Overview of electrical terminal areas Fig. 47 Extra low voltage (ELV) terminal area < 42 V HMI programming unit (upper PCB) EHCU electronics module Terminal area 230 V~/400 V~ (lower PCB) HPMU electronics module Opening electrical terminal areas Please note...
Page 65 Electrical connections Electrical connection of the indoor unit (cont.) Removing the programming unit mounting bracket Move the bracket to the maintenance position Fig. 48 Fig. 49...
Page 66 Electrical connections Electrical connection of the indoor unit (cont.) Opening the HPMU electronics module Opening the EHCU electronics module Fig. 50 Fig. 51 Indoor unit: Routing cables to the terminal area Danger Danger Damaged wiring insulation can lead to serious Incorrect wiring can lead to serious injury from injury from electrical current and result in appli- electrical current and result in appliance dam-...
Page 67 Electrical connections Electrical connection of the indoor unit (cont.) Please note Openly routed cables can be damaged by vibra- tion. Fasten all cables inserted into the appliance, along with the existing cable harness, with cable ties. < 42 V 230 V~/400 V~ Fig.
Page 68 Electrical connections Electrical connection of the indoor unit (cont.) Extra low voltage (ELV) terminal area < 42 V 1 2 3 4 5 6 9 10 11 12 CAN L GND CAN H CAN L CAN H PlusBus 1 2 3 4 5 6 7 8 9 10 11 12 24 V 24 V...
Page 69 91.H 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 70 Electrical connections Electrical connection of the indoor unit (cont.) Lower luster terminal : Sensors Terminals Component Explanation 1 and 2 Contact humidistat, 24 V for heating/cool- Recommended connecting cable: 92A.1 GND ing circuit 1 2 x 0.75 mm ■ 92A.2 24 V Max.
Page 71 Electrical connections Electrical connection of the indoor unit (cont.) Terminal area 230 V~/400 V~ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 L1 L2 L3 N1 N2 N3 1/N/PE 230 V/50 Hz 3/N/PE 400 V/50 Hz 1/N/PE 230 V/50 Hz Fig.
Page 72 Electrical connections Electrical connection of the indoor unit (cont.) Terminals Component/function Explanation 9 to 11 Only for indoor unit with 1 integrated heat- Configurable connection P1.N ing/cooling circuit: Output: 230 W ■ E.g. circulation pump for buffer discharge Voltage: 230 V~ ■...
Page 73 Electrical connections Electrical connection of the indoor unit (cont.) The following functions are available via the 4 digital inputs: Functions Switching contacts 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 74 Electrical connections Electrical connection of the indoor unit (cont.) Functions Switching contacts 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 75 Electrical connections Electrical connection of the indoor unit (cont.) HPMU electronics module: Accessory 230 V~ and BUS connection N? L F1 T6.3 A Fig. 55 F1 Fuse 6.3 A H (slow) Make all connections with flexible cables. 230 V~ connections Terminals Component Explanation...
Page 76 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 communication cable may only be connec- ted to terminal 72.
Page 77 156 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 form a system network with other Note compatible appliances via the external CAN bus. Com-...
Page 78 ID must be changed to "ID 98" for one of Recommended cable type: See chapter "Connecting them. with other Viessmann appliances via the CAN bus". Installation and service instructions for the Please note "Energy meter"...
Page 79 Electrical connections Electrical connection of the indoor unit (cont.) Fitting the programming unit Fig. 60 Programming unit...
Page 80 Electrical connections Electrical connection of the outdoor unit Cable routing to the terminal area Outdoor unit with 1 fan Length of cable in appliance: Compressor power cable 230 V~: 300 mm ■ ■ CAN bus communication cable: 900 mm Fig. 61 Compressor power supply 230 V~ Connection for CAN bus communication cable (accessories)
Page 81 Electrical connections Electrical connection of the outdoor unit (cont.) Outdoor unit with 2 fans, types A10 to A13 Fig. 62 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 82 Electrical connections Electrical connection of the outdoor unit (cont.) Outdoor unit with 2 fans, types ...A16 to A19 Fig. 63 Compressor power supply 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 83 Electrical connections Indoor/outdoor unit CAN bus communication cable… (cont.) Recommended cable Recommended cable: ■ Indoor/outdoor unit bus communication cable (acces- sories), length 5, 15 or 30 m ■ For wiring on site: Only use the cable types listed in the following two tables.
Page 84 Electrical connections Indoor/outdoor unit CAN bus communication cable… (cont.) Outdoor unit with 1 fan GND LOW- High+ 3 4 5 CAN L CAN H Fig. 64 Ferrite Colour coding to IEC 60757: BN Brown GN Green WH White...
Page 85 Electrical connections Indoor/outdoor unit CAN bus communication cable… (cont.) Outdoor unit with 2 fans, types ...A10 to A13 Vitocal 230 V Vitocal 400 V 3 4 5 CAN L CAN H Fig. 65 Ferrite Colour coding to IEC 60757: BN Brown GN Green WH White...
Page 86 Electrical connections Indoor/outdoor unit CAN bus communication cable… (cont.) Outdoor unit with 2 fans, types ...A16 to A19 High + Low - 3 4 5 CAN L CAN H Fig. 66 Colour coding to IEC 60757: BN Brown GN Green WH White...
Page 87 Electrical connections Power supply Isolators for non-earthed conductors Note ■ Install an isolator in the power cable to provide Incorrectly executed electrical installations may cause omnipolar separation from the mains for all active undesirable electromagnetic interaction with other conductors, corresponding to overvoltage category electronic devices.
Page 88 Electrical connections 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 Power supply: 1/N/PE 230 V/50 Hz ■ instantaneous heating water heater: Recommended power cable: ■...
Page 89 Electrical connections Power supply (cont.) Heat pump control unit Power supply 1/N/PE 230 V/50 Hz 1/N/PE 230 V/50 Hz Recommended power cable Without power-OFF 3 x 1.5 mm ■ With power-OFF 5 x 1.5 mm ■ Max. cable length 50 m Max.
Page 90 Electrical connections Power supply (cont.) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 L1 L2 L3 N1 N2 N3 1/N/PE 230 V/50 Hz 3/N/PE 400 V/50 Hz 1/N/PE 230 V/50 Hz Fig. 68 Jumpers Mains terminals for the instantaneous heating water heater...
Page 91 Electrical connections Power supply (cont.) Instantaneous heating water heater power supply 230 V~ Power supply 1-phase 2-phase 3-phase N2 N3 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 92 Electrical connections Power supply (cont.) Outdoor unit: Compressor power supply 230 V~/400 V~ Danger Please note Risk of explosion: Electrical components can Incorrect phase sequence can cause damage to cause sparks which may be ignited by escaping the appliance. refrigerant. Connect the 400 V~ compressor power supply Before inserting or removing the power supply only in the phase sequence specified (see ter-...
Page 93 Feed: TNC system Mains power supply in conjunction with self-consumption Connection schematics for self-consumption via the integrated energy management system as well as fur- ther information: See https://link.viessmann.com/energymanagement. Fig. 70 Closing the indoor unit Danger Please note The absence of system component earthing can...
Page 94 Electrical connections Closing the outdoor unit Note The following information for closing the outdoor unit applies to outdoor units with 1 or 2 fans. The outdoor unit with 2 fans is shown as an example. Fig. 71 2. Torque 1.5 +1.0 Nm...
Page 95 Commissioning, inspection, maintenance Steps - commissioning, inspection and maintenance Commissioning steps Inspection steps Maintenance steps Page • 1. Compiling reports......................96 • 2. Only types ...A16 to A19: Removing the compressor transport bracket...... 96 • 3. Commissioning the system....................97 •...
Page 96 Commissioning, inspection, maintenance Compiling reports Enter the readings taken during commissioning in the reports on page 185 onwards and the operator's log (if available). Only types ...A16 to A19: Removing the compressor transport bracket Danger Danger Operating the outdoor unit with the compressor If the compressor transport bracket is re-used, transport bracket still installed may cause dam- there is a risk of explosion due to defective pro-...
Page 97 All hydraulic lines are connected to the heat pump For external CAN bus for system networks: See ■ and have been checked for leaks. "Connecting with other Viessmann appliances via the ■ The indoor and outdoor units are connected to each CAN bus".
Page 98 The ViGuide app for commissioning and servicing is available for iOS and Android devices. 1. Where one or more of the other Viessmann appli- ances have already been operational as a stand- alone unit, first restore the factory settings on these Viessmann appliances.
Page 99 The heat pump must be connected to the This WiFi connection is independent of the home Viessmann server via the internet in order to per- WiFi network. form settings via the ViCare app. This internet con- ■...
Page 100 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Information Confirm the information displayed on the "service link" and the data protection information. Language Select the required menu language for the programming unit. Country Select the country of installation. Date and time Set the date and time.
Page 101 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Heating/cooling circuit 1 to Configuring the heating/cooling circuits heating/cooling circuit 4 Note For types ..2C, only 2 heating/cooling circuits can be configured. Function Not available ■ ■ Heating/cooling circuit without mixer ■...
Page 102 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Venting The system is vented via the quick-action air vent valve in the outdoor unit: See chapter "Venting the system" on page 111. Note If the outdoor unit is not yet connected, connect both the flow and return connec- tions of the outdoor unit to the indoor unit on site.
Page 103 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references External heat generator Operating mode, external Not active ■ heat generator Demands cannot be sent to the external heat generator. Heating only ■ Room heating via the external heat generator; no room cooling Note DHW is always heated by the integral instantaneous heating water heater.
Page 104 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references Electric booster heater Enabling the integral instantaneous heating water heater Function not available The instantaneous heating water heater is not enabled for room heating or DHW ■ heating: Instantaneous heating water heater only is switched on only for frost protection of the heat pump and the system.
Page 105 Commissioning, inspection, maintenance Commissioning the system (cont.) Procedure Explanations and references System configuration Quieter operation Quieter operation of the outdoor unit: During quieter operation, the compressor and fan are operated at reduced speed. Function Enable/disable quieter operation. ■ Time program Set the time program for quieter operation: See operating instructions.
Page 106 Note less remote control The wireless remote control is commissioned via the ViGuide app. The Viessmann appliance (e.g. heat generator or ven- tilation unit) is connected to the wireless remote control via low power radio. Filling the system The filling of the system is menu-guided with the com- Please note missioning assistant.
Page 107 Commissioning, inspection, maintenance Filling the system (cont.) Note For indoor units with 2 integrated heating/cooling cir- cuits, heating/cooling circuit 2 is filled in the 1st step. Then the filling of the rest of the system, including the outdoor unit, is menu-guided. For this, the 4/3-way valve switches in turn between each of the lines for the heating/cooling circuit 1, DHW heating, defrost buffer, etc.
Page 108 Commissioning, inspection, maintenance Filling the system (cont.) Filling the remaining consumer circuits DHW circuit ("Filling DHW"), integral buffer cylinder ("Filling defrost buffer") and heating/cooling circuit 1 ("Filling heating/cooling circuit 1") are filled in turn. Fig. 75 Start filling the remaining consumer circuits: 2.
Page 109 Commissioning, inspection, maintenance Filling the system (cont.) 3. Open the outdoor unit 3-way flow and return ball 5. Once air bubbles stop coming out of the drain valve as shown in Fig. 75: Open in all directions hose, use to start filling the next consumer cir- Allow the heating water to flow in via the fill hose.
Page 110 Commissioning, inspection, maintenance Building up the system pressure Fig. 76 Filling the system with the filling function is completed. 4. Open the 3-way ball valve to the outdoor unit The "Build up system pressure" function then starts return (indoor unit heating water outlet): See automatically.
Page 111 Commissioning, inspection, maintenance Building up the system pressure (cont.) 7. Close the 3-way ball valve from the outdoor unit 9. Thermally insulate the hydraulic connections. flow (indoor unit heating water inlet) in the direction of the fill hose. The flow direction from the outdoor unit to the indoor unit remains open.
Page 112 Commissioning, inspection, maintenance Opening the heat pump Danger Please note Contact with live components can lead to seri- Refrigerant can escape when working on the ous injury from electric current. Some compo- refrigerant circuit. nents on PCBs remain live even after the power ■...
Page 113 Commissioning, inspection, maintenance Filling and venting the DHW cylinder on the DHW side 1. Open all DHW draw-off points in the building. 3. Once air stops coming out of the DHW draw-off point, the DHW cylinder is completely filled. 2. Open the on-site drinking water supply. Testing the anode connection 1.
Page 114 Commissioning, inspection, maintenance Checking the anode earth current with an anode tester 1. Remove thermal insulation 2. Remove earth cable from protective magne- sium anode 3. Connect the tester (measuring range up to 5 mA) in series across tab of protective magnesium anode and earth cable Anode earth Protective magnesium anode...
Page 115 Commissioning, inspection, maintenance Draining the appliance on the DHW side (cont.) Fig. 79 Thermal insulation Protective magnesium anode Earth cable Gasket 6. Insert a hose into the DHW cylinder. Drain with a pump. Please note Negative pressure in the DHW cylinder can cause material damage.
Page 116 Commissioning, inspection, maintenance Checking all connections on the heating water and DHW sides for leaks Danger Please note There is a risk of electric shock from escaping Leaking hydraulic connections lead to appliance heating water or DHW. damage. When commissioning and after carrying out ■...
Page 117 Commissioning, inspection, maintenance 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 PS x DN Category Pipework according to article 4, para- < DN 25 < 546 barmm —...
Page 118 See also chapter "Checklist for maintenance work". ■ Test the safety chain annually: Request information about the test procedure from Viessmann Technical Cleaning work: Service. ■ Clean the filter in the outdoor unit return: See chap- ■...
Page 119 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 120 Commissioning, inspection, maintenance Checking that the fan in the outdoor unit can run freely Danger Danger Contact with the fans while they are operating A blocked fan may break during operation. Fly- can result in serious cutting injuries. ing fragments can cause life threatening injuries. ■...
Page 121 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 122 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. 82 Apertures in the base plate Condensate pan Condensate drain 3.
Page 123 Commissioning, inspection, maintenance Cleaning the DHW cylinder (cont.) 1. Shut off the drinking water supply. Ensure ade- quate ventilation in the DHW pipework by opening a cold and hot water tap. Remove the thermal insulation. Danger The uncontrolled escape of DHW can cause scalding and building damage.
Page 124 Commissioning, inspection, maintenance Cleaning the DHW cylinder (cont.) 04. Insert a hose into the DHW cylinder. Drain with a 07. Use a chemical cleaning agent to remove hard pump. deposits that cannot be removed with a high pres- sure cleaner. Please note Negative pressure in the DHW cylinder can Danger...
Page 125 Separate service instructions "System con- ■ For heating/cooling circuit 2, select the setting figuration and diagnosis for heat pumps with "50 %". Viessmann One Base" Closing the heat pump Danger Please note The absence of system component earthing can If a casing door is not securely closed this can...
Page 126 Commissioning, inspection, maintenance Closing the heat pump (cont.) Please note Close the heat pump after completing all work. Leaking hydraulic connections lead to appliance damage. ■ Check the internal and on-site hydraulic con- nections for leaks. In the event of leaks, switch off the appliance ■...
Page 127 Commissioning, inspection, maintenance Entering the contractor's contact details The system operator can call up contact details when "Contractor contact details" required and notify the contractor. 4. Enter contact details. Tap the following buttons: to confirm "Information" Instructing the system user The system installer should hand the operating instruc- Equipment and functions of the heating system must tions to the system user and instruct the user in oper-...
Page 128 System configuration and diagnostics 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 129 System configuration and diagnostics Service menu (cont.) 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. " " 8. Enter master password.
Page 130 System configuration and diagnostics System configuration (cont.) Parameter Descriptions of the parameters are available online: https://link.viessmann.com/tdoc/6200041 Fig. 86 Diagnostics Checking operating data Only the operating data that correspond to the actual "Service" system equipment level are shown. 3. Enter password "viservice".
Page 131 System configuration and diagnostics Diagnostics (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 16.4 bar...
Page 132 System configuration and diagnostics Checking subscribers All detected subscribers, e.g. CAN bus subscribers, "Service" are displayed. Possible subscribers: See "Subscriber numbers" in 3. Enter password "viservice". chapter "Calling up acknowledged messages". 4. Confirm with Tap the following buttons: 5. "Appliances detected" 1.
Page 133 System configuration and diagnostics Checking outputs (actuator test) (cont.) Heating group Display Meaning Secondary circuit pump speed Set value Only for indoor units with 1 integral heating/cooling circuit: Speed of internal secondary pump/heating circuit pump, heating/ cooling circuit 1 in % 4/3-way valve position Set value 4/3-way valve position in %...
Page 134 System configuration and diagnostics Checking outputs (actuator test) (cont.) Display Meaning Mixer for heating/cooling cir- Open Only in conjunction with an external buffer cylinder: cuit 4 Mixer for heating/cooling circuit 4 opens. Stop Current position is maintained. Close Mixer closes. Signal cooling Cooling mode enabled Cooling mode off...
Page 135 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 136 S1 on the cor- Communication module, service link (NB-IoT) responding extension module. The rotary switch was 71 to 84 Other Viessmann devices in the system net- set during installation. work To identify the extension module affected, check the...
Page 137 Indoor unit maintenance Overview of electrical terminal areas See page 64 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 138 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". Fig. 90 Removing the EHCU electronics module Danger Remove programming unit: See chapter "Removing Contact with live components can lead to seri-...
Page 139 Indoor unit maintenance Removing the programming unit and electronics… (cont.) Fig. 91 Note No recommissioning is necessary following replace- ment of the EHCU electronics module.
Page 140 Indoor unit maintenance Overview of internal components Indoor unit with 1 integrated heating/cooling circuit Water pressure sensor 4/3-way valve High limit safety cut-out (STB), instantaneous heating water heater Flow sensor Secondary pump Instantaneous heating water heater Safety valve Flow temperature sensor Return temperature sensor Fig.
Page 141 Indoor unit maintenance Overview of internal components (cont.) Indoor unit with 2 integrated heating/cooling circuits Water pressure sensor 4/3-way valve High limit safety cut-out (STB), instantaneous heating water heater Flow sensor Heating/cooling circuit 1 heating circuit pump Instantaneous heating water heater Safety valve Heating/cooling circuit 2 heating circuit pump Heating/cooling circuit 2 flow temperature sensor...
Page 142 Indoor unit maintenance Removing hydraulic components and EPP insulating parts When replacing hydraulic components and EPP insu- Please note lating parts, first fold out or remove electrical compo- Leaking hydraulic connections lead to appliance nents if required: See chapter "Removing the program- damage.
Page 143 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the expansion vessel 12 ±1 Nm 4,5 ±0,5 Nm Fig. 94...
Page 144 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the instantaneous heating water heater 400 V 230 V Fig. 95...
Page 145 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Fig. 96 Note 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 146 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the sensors Removing the flow sensor Fig. 97...
Page 147 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the secondary circuit temperature sensors Fig. 98...
Page 148 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Additionally for indoor unit with 2 integrated heating/cooling circuits Fig. 99...
Page 149 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the water pressure sensor Fig. 100...
Page 150 Indoor unit maintenance Removing hydraulic components and EPP… (cont.) Removing the circulation pump head Fig. 101 Torque settings Torque settings for the circuit pump union nuts: ■ 2 Nm ± ■ Torque for the screws on the pump head: 1 Nm ±...
Page 151 Indoor unit maintenance Checking the temperature sensors Temperature sensor NTC 10 k Connection Ω Outside temperature sensor Luster terminals for sensors, terminal 5 and 6 ■ ■ Plug 1 on the HPMU electronics module ■ Cylinder temperature sensor Plug 5 on the HPMU electronics module ■...
Page 152 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 153 Indoor unit maintenance Checking the water pressure sensor 0.45 Pressure Fig. 103 Checking the fuse Fuse F1 is located in the HPMU electronics module: 2. Open the HPMU electronics module. ■ See page 75. ■ Fuse F2 is located on the luster terminal for the heat 3.
Page 154 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 155 Outdoor unit maintenance Removing the outer casing (cont.) Removing the right-hand side casing Fig. 104...
Page 156 Outdoor unit maintenance Removing the outer casing (cont.) When fitting the right side panel, make sure it is positioned correctly: Fig. 105 Note Torque for the nuts: 1.5 +1.0 Nm Removing the top casing 1. Remove side casing, right: See Fig. 104.
Page 157 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 106 Note EPP support Torque for both screws: 1.8 +0.5 Nm Cover with gasket and sound insulation Cover Air space cover...
Page 158 Outdoor unit maintenance Removing the outer casing (cont.) Removing the front casing TX 25 Fig. 107 Note Torque for the screws: 1.8 +0.5 Nm Only for outdoor unit with 2 fans: Upper fan grille Reinforcing strut Lower fan grille...
Page 159 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 108 Note Torque for the screws: 1.8 +0.5 Nm Only for outdoor unit with 2 fans: Design grille, top Design grille, bottom 6. Remove side casing, right: See Fig. 104. 7.
Page 160 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 109 Note Torque for the screws: 1.8 +0.5 Nm Front panel Removing the left-hand side casing 1. Remove side casing, right: See Fig. 104. 3. Remove fan grilles and reinforcing strut: See Fig.
Page 161 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 110 Note Torque for the screws: 1.8 +0.5 Nm Evaporator Removing the rear casing 1. Remove side casing, right: See Fig. 104. 2. Remove top cover: See Fig. 106.
Page 162 Outdoor unit maintenance Removing the outer casing (cont.) TX 25 Fig. 111 Note Torque for the screws: 1.8 +0.5 Nm Evaporator Back panel...
Page 163 Outdoor unit maintenance 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 supply has been switched off.
Page 164 Outdoor unit maintenance Overview of electrical components (cont.) Outdoor unit with 2 fans, types ...A10 to A13 Chokes Fuses for PCB and fans 6.3 A H (slow), 250 V~ VCMU refrigerant circuit controller Coil, 4-way diverter valve Inverter Fig. 113 EMCF PCB with 400 V~/230 V~ power supply Terminal strip, 230 V~ function components...
Page 165 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 166 Outdoor unit maintenance Checklist for maintenance work (cont.) Measure Completed Comments General working environment Inform the following persons of the type of work to be carried ■ out: – All maintenance personnel – All persons in the vicinity of the system. Shut off the area surrounding the outdoor unit.
Page 167 & 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 168 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 169 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 170 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 171 Outdoor unit maintenance Overview of internal components (cont.) 4-way diverter valve Condenser Secondary circuit flow temperature sensor Liquid gas temperature sensor, heating Liquid gas temperature sensor, condenser Schrader valve, high pressure side 1 Hot gas temperature sensor Accumulator (refrigerant receiver) Compressor High pressure switch PSH Electronic expansion valve 1...
Page 172 Outdoor unit maintenance Overview of internal components (cont.) Outdoor unit with 2 fans, types ...A10 to A13 Fig. 116 Suction gas temperature sensor, evaporator Evaporator Secondary circuit flow temperature sensor Air intake temperature sensor Liquid gas temperature sensor, condenser Interior temperature sensor Hot gas temperature sensor Accumulator (refrigerant receiver) compressor Compressor...
Page 173 Outdoor unit maintenance Overview of internal components (cont.) Non-return valve High pressure sensor Liquid gas temperature sensor, heating Low pressure sensor Condenser Schrader valve, high pressure side 2 Accumulator (refrigerant receiver) Internal heat exchanger High pressure switch PSH Outdoor unit with 2 fans, types ...A16 to A19 wUwZ Fig.
Page 174 Outdoor unit maintenance Overview of internal components (cont.) Suction gas temperature sensor, evaporator Condenser High limit safety cut-out Schrader valve, low pressure side Float air vent valve with quick-action air vent valve Internal heat exchanger Schrader valve, evaporator High pressure sensor Compressor including oil sump heater Low pressure sensor Oil sump temperature sensor...
Page 175 Outdoor unit maintenance Refrigerant circuit flow diagrams (cont.) Heating mode Fig. 118 Evaporator Accumulator (refrigerant receiver) Air discharge Suction gas temperature sensor, evaporator May be installed on types ...A10 to A19 (depend- 4-way diverter valve ing on factory fill version) High pressure sensor Schrader valve, evaporator High pressure switch PSH...
Page 176 Outdoor unit maintenance Refrigerant circuit flow diagrams (cont.) Cooling mode Fig. 119 Evaporator Accumulator (refrigerant receiver) Air discharge Suction gas temperature sensor, evaporator May be installed on types ...A10 to A19 (depend- 4-way diverter valve ing on factory fill version) High pressure sensor Schrader valve, evaporator High pressure switch PSH...
Page 177 Outdoor unit maintenance Extracting the refrigerant Before commencing work, note the "Checklist for main- 06. Connect the refrigerant bottle to the extraction tenance work" on page 136 165 onwards. equipment. Connect the extraction equipment to the Schrader valves on the high pressure and low Also take into account the following points: pressure side of the refrigerant circuit via the ■...
Page 178 Outdoor unit maintenance Extracting the refrigerant (cont.) 14. Repeat steps 8 to 10 until there is no more refrig- 16. Affix a label to the outdoor unit in a clearly visible erant in the refrigerant circuit. position, containing the following information, with date and signature: Note ■...
Page 179 Outdoor unit maintenance Filling the refrigerant circuit (cont.) 4. Fill refrigerant circuit with refrigerant R290 (pro- 5. Close the Schrader valve so it is gas-tight. Fit the pane) via the Schrader valve of high pressure sealing cap. To achieve this, counterhold the valve side 2 (liquid line): See chapter "Overview of inter- body.
Page 180 Outdoor unit maintenance Draining the outdoor unit on the secondary side (cont.) 2. Turn setting screw slot by 90° in the direction of 3. Turn setting screw slot back by 90° perpendicular flow. to the direction of flow. Check valve is open. Heating water flows out in the Check valve is closed.
Page 181 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. 121 Stainless steel float air vent valve Plastic float air vent valve...
Page 182 Outdoor unit maintenance Removing the hydraulic components (cont.) Removing the ball valve with filter G 1¼ 50 ± 2 Nm Fig. 122 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 183 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 184 Outdoor unit maintenance Checking the pressure sensors Pressure Fig. 123 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 163. 2.
Page 185 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 186 Specification Specification Heat pumps with 400 V~ outdoor unit Type AWOT-E-AC/AWOT-E-AC-AF 251.A 10 10 2C 13 2C 16 2C 19 2C Heating performance data to EN 14511 (A2/W35) Rated heating output Fan speed Power consumption 1.31 1.68 1.76 2.13 Coefficient of performance in heating mode 4.46 3.98...
Page 187 Specification Specification (cont.) Type AWOT-E-AC/AWOT-E-AC-AF 251.A 10 10 2C 13 2C 16 2C 19 2C Energy efficiency class to Commission Regula- tion (EU) No 813/2013 Heating, average climatic conditions Low temperature application (W35) ■ Medium temperature application (W55) ■ DHW heating, draw-off profile (XL) Cooling performance data to EN 14511 (A35/W7) Rated cooling capacity...
Page 188 Specification Specification (cont.) Type AWOT-E-AC/AWOT-E-AC-AF 251.A 10 10 2C 13 2C 16 2C 19 2C Outdoor unit electrical values Rated voltage, compressor 3/N/PE 400 V/50 Hz Max. operating current, compressor 0.96 0.96 0.85 0.85 φ Compressor starting current, inverter controlled <...
Page 189 Specification Specification (cont.) Type AWOT-E-AC/AWOT-E-AC-AF 251.A 10 10 2C 13 2C 16 2C 19 2C Mobile data transfer WiFi Transfer standard IEEE IEEE IEEE IEEE 802.11 ■ 802.11 802.11 802.11 b/g/n b/g/n b/g/n b/g/n Frequency band 2400 to 2400 to 2400 to 2400 to ■...
Page 190 Specification Specification (cont.) Type AWOT-E-AC/AWOT-E-AC-AF 251.A 10 10 2C 13 2C 16 2C 19 2C Outdoor unit dimensions Total length Total width 1144 1144 1144 1144 Total height 1382 1382 1382 1382 Indoor unit dimensions Total length Total width With 1 integrated heating/cooling circuit ■...
Page 191 Specification Specification (cont.) Heat pumps with 230 V~ outdoor unit Type AWOT-M-E-AC/ 251.A 04 AWOT-M-E-AC-AF 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 192 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 AWOT-M-E-AC-AF 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 193 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 AWOT-M-E-AC-AF 04 2C 06 2C 08 2C 10 2C 13 2C Outdoor unit electrical values Rated voltage, compressor 1/N/PE 230 V/50 Hz Max. operating current, compressor 15.5 0.99 0.99 0.99 0.99 0.99 φ Compressor starting current, inver- <...
Page 194 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 AWOT-M-E-AC-AF 04 2C 06 2C 08 2C 10 2C 13 2C Mobile data transfer WiFi Transfer standard IEEE 802.11 b/g/n ■ Frequency band 2400 to 2483.5 ■ Max. transmission power ■ Low power radio Transfer standard IEEE 802.15.4 ■...
Page 195 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 AWOT-M-E-AC-AF 04 2C 06 2C 08 2C 10 2C 13 2C Indoor unit dimensions Total length Total width With 1 integrated heating/cooling ■ circuit With 2 integrated heating/cooling ■ circuits Total height 1900 1900 1900 1900...
Page 196 Specification Specification (cont.) Heat pumps with 230 V~ outdoor unit and indoor unit with central power supply Type AWOT-M-E-AC/ 251.A 04 SP 06 SP 08 SP 10 SP 13 SP AWOT-M-E-AC-AF 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Heating performance data to...
Page 197 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 SP 06 SP 08 SP 10 SP 13 SP AWOT-M-E-AC-AF 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Energy efficiency class to Com- mission Regulation (EU) No 813/2013 Heating, average climatic conditions Low temperature application...
Page 198 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 SP 06 SP 08 SP 10 SP 13 SP AWOT-M-E-AC-AF 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Outdoor unit electrical values Rated voltage, compressor 1/N/PE 230 V/50 Hz Max.
Page 199 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 SP 06 SP 08 SP 10 SP 13 SP AWOT-M-E-AC-AF 04 2C SP 06 2C SP 08 2C SP 10 2C SP 13 2C SP Mobile data transfer WiFi Transfer standard IEEE 802.11 b/g/n ■...
Page 200 Specification Specification (cont.) Type AWOT-M-E-AC/ 251.A 04 SP 06 SP 08 SP 10 SP 13 SP AWOT-M-E-AC-AF 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 201 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 and substances from the system are not part of ordi- nary domestic waste.
Page 202 Appendix Final decommissioning and disposal (cont.) Danger Frost protection: Escaping refrigerant can lead to explosions that ■ To avoid frost damage, completely remove heating result in very serious injuries. water from the connection pipes and the condenser Do not introduce any power sources or ignition (not required with frost-free storage).
Page 203 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 204 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 205 Keyword index Keyword index Condensate drain......20, 21, 22, 42, 121 Access point...............97 – In seepage layer............33 – Switching on/off.............132 – Via drain pipe............32 Accumulator............. 175, 176 – Via waste water system.......... 33 Actuator test............. 132 – Without drain pipe........... 32 Air discharge..............
Page 206 Keyword index Keyword index (cont.) Electrical connections Flow temperature sensor......140, 141, 151 – Checking............... 124 – Heating/cooling circuit 2........151 – Checking outdoor unit........... 124 – Secondary circuit....171, 172, 173, 175, 176 – Overview............137, 163 Foundation......33, 34, 35, 36, 38, 39, 40 Electrical terminal areas..........64 Foundations............
Page 207 Keyword index Keyword index (cont.) Installation – Outdoor unit............23 ON/OFF switch, relocating......... 63 Installation, outdoor unit On-site connections........... 18 – Bracket set for wall mounting........27 Operating data, calling up........130 Installation information..........26 Operating noise............126 Installation location requirements Operating states, checking........130 –...
Page 208 Keyword index Keyword index (cont.) Power supply Return – Compressor.............92 – DHW cylinder............ 18, 19 – General information..........87 – Outdoor unit........18, 19, 20, 21, 22 – Heat pump control unit........88, 93 – Secondary circuit.........18, 19, 20 – Instantaneous heating water heater......89 Return temperature –...
Page 209 Keyword index Keyword index (cont.) Temperature sensor......... 147, 151, 182 – Air intake, evaporator......170, 172, 173 Valve, 4/3-way..........140, 141 – Hot gas........171, 172, 173, 175, 176 Ventilation of work location........166 – Suction gas........170, 171, 172, 174 Venting function............111 Terminal areas, opening..........64 Vibration isolation............
Page 212 Viessmann Climate Solutions SE Viessmann Limited 35108 Allendorf / Germany Hortonwood 30, Telford Telephone: +49 6452 70-0 Shropshire, TF1 7YP, GB Fax: +49 6452 70-2780 Telephone: +44 1952 675000 www.viessmann.com Fax: +44 1952 675040 E-mail: info-uk@viessmann.com...

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