Viessmann VITOCAL 151-A Manual
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Viessmann VITOCAL 151-A Manual

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VIESMANN
Connection and wiring diagram
for contractors
Vitocal 151-A
Type AWOT(-M)-E-AC/AWOT(-M)-E-AC-AF 151.A
Air source heat pump, monoblock version for heating and cooling operation, with
1 integral heating/cooling circuit
VITOCAL 151-A
Please keep safe.
6171787 GB
10/2021

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  • Page 1 VIESMANN Connection and wiring diagram for contractors Vitocal 151-A Type AWOT(-M)-E-AC/AWOT(-M)-E-AC-AF 151.A Air source heat pump, monoblock version for heating and cooling operation, with 1 integral heating/cooling circuit VITOCAL 151-A Please keep safe. 6171787 GB 10/2021...
  • 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 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: Table Of Contents

    Index Index Notes Notes ..................... 10 Operating medium ................. 10 Colour coding ..................10 Connection and wiring dia- Sheet 1: HPMU electronics module, plug 1, 5, 74, 91 ......11 gram: Indoor unit Sheet 2: HPMU electronics module, plug X4, X5 ........12 Sheet 3: HPMU electronics module, 230 V~ components .....

  • Page 10: Notes Notes

    Notes Notes Observe the information on electrical connections in ■ the installation and service instructions. ■ In the case of a power supply with power-OFF facility, the power to the control circuit (heat pump control unit) must be supplied without interruption by the power supply utility.

  • Page 11: Connection And Wiring Dia-Sheet 1: Hpmu Electronics Module, Plug 1, 5, 74, 91

    Connection and wiring diagram: Indoor unit Sheet 1: HPMU electronics module, plug 1, 5, 74, 91 Fig. 1 HPMU electronics module Cylinder temperature sensor PlusBus Outside temperature sensor CAN bus when integrated into an external CAN bus system as the first or last subscriber (plug 91 in the HPMU electronics module without terminator) CAN bus when integrated into an external...

  • Page 12: Gram: Indoor Unit Sheet 2: Hpmu Electronics Module, Plug X4, X5

    Connection and wiring diagram: Indoor unit Sheet 2: HPMU electronics module, plug X4, X5 Fig. 2 HPMU electronics module CAN bus cable to the EHCU electronics module Connecting cable to the HMI programming unit...

  • Page 13: Sheet 3: Hpmu Electronics Module, 230 V~ Components

    Connection and wiring diagram: Indoor unit Sheet 3: HPMU electronics module, 230 V~ components Fig. 3 HPMU electronics module Circulation pump, e.g. heating circuit pump Power supply for digital inputs and digital inputs, DHW circulation pump connections 143.1 to 143.5 AC contact for active cooling function...

  • Page 14: Sheet 4: Hpmu Electronics Module, 230 V~ Mains Connections

    Connection and wiring diagram: Indoor unit Sheet 4: HPMU electronics module, 230 V~ mains connections Fig. 4 HPMU electronics module Power supply to control unit/PCB Power supply, EHCU electronics module Switched mains output for mains connection, accessories, e.g. mixer extension kit...

  • Page 15: Sheet 6: Ehcu Electronics Module, Plug X4, X10, X11, X20

    Connection and wiring diagram: Indoor unit Sheet 6: EHCU electronics module, plug X4, X10, X11, X20 Fig. 5 EHCU electronics module Pressure sensor Flow temperature sensor, heating/cooling circuit 1 Do not connect anything here! Return temperature sensor CAN bus cable to the HPMU electronics module...

  • Page 16: Sheet 7: Ehcu Electronics Module, Plug X1, X2, X5, X17

    Connection and wiring diagram: Indoor unit Sheet 7: EHCU electronics module, plug X1, X2, X5, X17 Fig. 6 EHCU electronics module CAN bus when integrated into an external 4/3-way valve motor CAN bus system as the first or last subscriber PlusBus subscriber E.g.

  • Page 17: Sheet 8: Ehcu Electronics Module, Plug X7, X19, X22, X23, X26

    Connection and wiring diagram: Indoor unit Sheet 8: EHCU electronics module, plug X7, X19, X22, X23, X26 92 A Fig. 7 EHCU electronics module Flow sensor Do not connect anything here! Do not connect anything here! Contact humidistat 24 V for heating/cooling cir- PWM signal for secondary pump/heating circuit cuit 1 pump, heating/cooling circuit 1...

  • Page 18: Sheet 9: Ehcu Electronics Module, Plug X3, X6, X12, X18, X25

    Connection and wiring diagram: Indoor unit Sheet 9: EHCU electronics module, plug X3, X6, X12, X18, X25 Fig. 8 EHCU electronics module AC contact for active cooling function Power supply, secondary pump/heating circuit Power supply EHCU pump, heating/cooling circuit 1 Do not connect anything here! Secondary pump/heating circuit pump, heating/ Digital inputs...

  • Page 19: Sheet 10: Ehcu Electronics Module, Instantaneous Heating Water Heater

    Connection and wiring diagram: Indoor unit Sheet 10: EHCU electronics module, instantaneous heating water heater N PE L3 L2 L1 N3 N2 N1 Fig. 9 EHCU electronics module Instantaneous heating water heater High limit temperature cut-out device Power supply to instantaneous heating water heater with 3 x 230 V~ connection Power supply to instantaneous heating water heater, 400 V~ and 230 V~...

  • Page 20: Connection And Wiring Dia-Sheet 102: Compressor 400 V

    Connection and wiring diagram: Outdoor unit Sheet 102: Compressor 400 V~ Rx/Tx- -- / Rx/Tx+ 1.6 / -GND 2.3 Tacho -GNDL +10V -GNDL Tacho +10V Fig. 10 Compressor power supply Hot gas temperature sensor Mains terminals, compressor High pressure switch PSH Lower fan Interior temperature sensor Upper fan...

  • Page 21: Gram: Outdoor Unit Sheet 104: Compressor 230 V

    Connection and wiring diagram: Outdoor unit Sheet 104: Compressor 230 V~ -- / Rx/Tx- Rx/Tx+ 3.6 / -GND -GNDL Tacho +10V -GNDL Tacho +10V Fig. 11 Compressor power supply Hot gas temperature sensor Mains terminals, compressor High pressure switch PSH Lower fan Interior temperature sensor Upper fan...

  • Page 22: Sheet 106: Vcmu Refrigerant Circuit Controller

    Connection and wiring diagram: Outdoor unit Sheet 106: VCMU refrigerant circuit controller Fig. 12 Control of upper fan CAN bus communication cable to indoor/outdoor Control of lower fan unit, connection to luster terminals Electronic expansion valve 1 Liquid gas temperature sensor, condenser Electronic expansion valve 2 (NTC 10 k Ω...
  • Page 23 Connection and wiring diagram: Outdoor unit Sheet 106: VCMU refrigerant circuit controller (cont.) Secondary circuit flow temperature sensor Suction gas temperature sensor, compressor (NTC 10 k (NTC 10 k Ω Ω High pressure sensor Hot gas temperature sensor (NTC 10 k Ω...
  • Page 24 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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