Viessmann VITOTRONIC 300 Installation And Service Instructions Manual
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Viessmann VITOTRONIC 300 Installation And Service Instructions Manual

Type gw5b & mw1b, digital boiler control unit & weather-compensated digital cascade control unit
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See also: Instruction and Installation Manual , Installation and Service Instructions Manual
Installation and Service
Instructions
for use by heating contractor
Vitotronic 300, Type GW5B
Digital boiler control unit
Vitotronic 300-K, Type MW1B
Weather-compensated digital cascade control unit
VITOTRONIC 300, GW5B
VITOTRONIC 300-K, MW1B
Certified as a component
part for Viessmann boilers
5693 973 - 03 07/2014
Vitotronic 300, GW5B
Vitotronic 300-K, MW1B
Product may not be exactly as shown
IMPORTANT
Read and save these instructions
for future reference.
Please file in Service Binder

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Summary of Contents for Viessmann VITOTRONIC 300

  • Page 1 Installation and Service Instructions for use by heating contractor Vitotronic 300, Type GW5B Digital boiler control unit Vitotronic 300-K, Type MW1B Weather-compensated digital cascade control unit VITOTRONIC 300, GW5B VITOTRONIC 300-K, MW1B Vitotronic 300, GW5B Vitotronic 300-K, MW1B Product may not be exactly as shown...

  • Page 2: Safety, Installation And Warranty Requirements

    General Vitotronic 300, GW5B and MW1B Installation and Service Safety, Installation and Warranty Requirements Please ensure that these instructions are read and understood before commencing installation. Failure to comply with the instructions listed below and details printed in this manual can cause product/property damage, severe personal injury, and/or loss of life.

  • Page 3: Table Of Contents

    Table of Contents Vitotronic 300, GW5B and MW1B Installation and Service Page Safety, Installation and Warranty Requirements....2 General Product documentation........2 Warranty............2 Licensed professional heating contractor....2 Advice to owner..........2 Operating and Service Documentation....2 Product Information............2 Safety About these Instructions..........6 For your Safety............7 Operation............7...
  • Page 4 Table of Contents Vitotronic 300, GW5B and MW1B Installation and Service Page Power Supply Power Supply............38 Fitting the Control Unit Front........39 Opening and Closing the Control Units Opening the Control Unit...........39 Testing the High Limit Safety Cut-out......40 Commissioning Changing the Language on the Vitotronic 300-K...40 Setting the Date and Time the Vitotronic 300-K...40...
  • Page 5 Table of Contents Vitotronic 300, GW5B and MW1B Installation and Service Page Code 1, Vitotronic 300, GW5B Calling up Coding Level 1..........71 Group 1 “General”............71 Group 2 “ Boiler”............72 Code 2, Vitotronic 300, GW5B Calling up Coding Level 2..........73 Group 1 “General”............74 Group 2 “...

  • Page 6: About These Instructions

    Safety Vitotronic 300, GW5B & MW1B Installation and Service About these Instructions Take note of all symbols and notations intended to draw attention to potential hazards or important product information. These include “WARNING”, “CAUTION”, and “IMPORTANT”. See below. Warnings draw your attention to the presence of WARNING potential hazards or important product information.

  • Page 7: For Your Safety

    Safety Vitotronic 300, GW5B & MW1B Installation and Service For your Safety If you smell gas CAUTION H Don’t smoke! Don’t use naked flames or cause sparks (e.g. by switching lights or electrical appliances on Follow these safety instructions closely to avoid the risk and off) of injury and damage to property.

  • Page 8: Designation In The System Example

    Preparing for Installation Vitotronic 300, GW5B and MW1B Installation and Service Designations in the System Example Overview of System Example Boiler Characteristics Page Vitocrossal, 200 CM2 Multi-boiler installation H This system example is merely a generic layout and must therefore be checked on site for completeness and function.

  • Page 9: System Example

    Preparing for Installation Vitotronic 300, GW5B & MW1B Installation and Service System Example Multi boiler system: Vitocrossal 200 CM2 Hydraulic installation layout Note: This layout is a basic example without shut-off devices or safety equipment. This does not replace the need for local engineering.
  • Page 10 Preparing for Installation Vitotronic 300, GW5B & MW1B Installation and Service System Example (continued) Equipment required Pos. Description Boiler I (cascade mode) Neutralizing system Boiler water temperature sensor KTS Supply temperature sensor, common heating supply VTS as contact temperature sensor (standard delivery for Vitotronic 300-K)
  • Page 11 Short term operation of DHW circulation pump External hook-ups - External blocking/mixing valve closed - External demand - External heating program changeover/mixing valve open LON communication module (standard delivery Vitotronic 300-K) for communication with the following components: Vitotronic boiler and heating circuit control units...
  • Page 12 Preparing for Installation Vitotronic 300, GW5B & MW1B Installation and Service System Example (continued) Electrical installation wiring...
  • Page 13 Preparing for Installation Vitotronic 300, GW5B & MW1B Installation and Service System Example (continued)
  • Page 14 Preparing for Installation Vitotronic 300, GW5B & MW1B Installation and Service System Example (continued) Code required at every Vitotronic 300, GW5B Group Function 01:2 2 “Boiler” Multi boiler system with cascade control via LON Boiler number at the Vitotronic: 07:2 2 “Boiler”...

  • Page 15: Overview Of Electrical Connections

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Overview of Electrical Connections Note: When connecting plugs aVD and aVH, bundle the individual cores of the cables close to the terminals. This prevents the cores from shifting into the neighboring voltage area.
  • Page 16 Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Overview of Electrical Connections (continued)

  • Page 17: External Connection Overview

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service 120V External Connection Overview Legend Pumps 120V A Pumps Available pump connections B To the control unit sÖM1/A1 Switching contact Boiler pump Rated current: 2A~ * Maximum output 6FLA shared between all...

  • Page 18: Inserting Cables And Applying Strain Relief

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Inserting Cables and Applying Strain Relief H Control unit fitted on the boiler: Route cables from below through the front panel of the boiler into the wiring chamber of the control unit.

  • Page 19: Inserting The Lon Communication Module

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Inserting the LON Communication Module Making the LON connection, see page 37. Connecting Sensors Legend Main PCB low voltage aJA Return temperature sensor T1 (optional accessory) aJB Return temperature sensor T2 (optional accessory) 120V External Connection 120V pumps with an amperage draw of <2FLA...
  • Page 20 Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service 120V External Connection (continued) 120V pumps with an amperage draw of >2FLA Contactor specification 120VAC 1A A Din rail B Contactor/relay (field supplied) C Pump D Power supply w/disconnect and protection...

  • Page 21: Connecting Actuators

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Connecting Actuators Legend Legend A 24V Mixing Valve Adaptor A 120V Mixing Valve Adaptor B DIN Rail (in junction box) B DIN Rail (in connection enclosure) C 24V Valve Actuator...

  • Page 22: Connection The Central Fault Massage Facility

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Connecting the Central Fault Message Facility Rated voltage 120V~ Rated current max. 2A~ Connection of Low Water Cut-off Device 1. Remove jumper between terminals 12 and 15. 2. Make connection as shown in diagram.

  • Page 23: Connections To Terminal 150

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Connections to Safety Equipment 1. Connect the external safety equipment in series. Legend A DIN rail B Low water cutoff C Other safety controls Connections to Terminal aBA External shut-off 1.

  • Page 24: Blocking Boiler Externally/Adding To The Boiler Sequence

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Blocking Boiler Externally/Adding to the Boiler Sequence Connection at plug aVD. Note: ‘Live’ contacts lead to short circuits or phase failure. The external connection must be floating. Contact A: H Contact closed: The boiler is removed from the boiler sequence.

  • Page 25: Connecting A Burner

    Installation, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Connecting the Burner The burner cables are included in the standard boiler delivery. Max. power consumption 3A. Terminal codes Burner control power supply Ground conductor to burner Neutral conductor to burner...

  • Page 26: Overview Of Electrical Connections

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Overview of Electrical Connections Note: When connecting plugs aVD, aVH, sA, sK, ? M2/M3 and sÖ M2/M3, bundle the individual wires of the cables close to the terminals. This ensures that, should there be an error, for example when detaching a wire, the wires cannot drift into the adjacent voltage area.
  • Page 27 Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Overview of Electrical Connections, Vitotronic 300-K (continued) Legend A Vitotronic 300-K B Din rail...

  • Page 28: Mounting The Control Unit

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Mounting the Control Unit 1. Fasten metal backplate onto mounting surface with four fasteners. 2. Position midplate between backplate and connection enclosure. 3. Install midplate and connection enclosure onto backplate.

  • Page 29: Inserting Cables/Leads And Applying Strain Relief

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Inserting Cables/Leads and Applying Strain Relief Run the cables from the connection enclosure into the control unit. Apply strain relief to cables. Cables with moulded strain relief clamp: Connect cable and strain relief clamp.

  • Page 30: Connecting Pumps

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connecting Pumps Pumps 120V Legend Available pump connections A120V outputs sÖM1/A1 High temperature circuit pump/ B To the control unit primary store pump Rated current: 2 A~ Heating circuit 2 pump sÖM2...

  • Page 31: Connecting Sensors

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connecting Sensors Installation point for outside temperature sensor H North or north-western wall, 6.6 to 8.2 ft. (2 to 2.5 m) above ground level; in multi storey buildings, in the...

  • Page 32: External Connection

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service 120V External Connection 120V pumps with an amperage draw of <2FLA A Din rail B Pump 120V pumps with an amperage draw of >2FLA Contactor specification 120VAC 1A A Din rail...

  • Page 33: Connecting Actuators

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connecting Actuators Legend Legend A 24V Mixing Valve Adaptor A 120V Mixing Valve Adaptor B DIN Rail (in junction box) B DIN Rail (in junction box) C 24V Valve Actuator...

  • Page 34: Connection Central Fault Massage Facility

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connecting the Central Fault Message Facility Rated voltage 120V~ Rated current max. 2 A~ External Demand Via Switching Contact Connection Note: ‘Live’ contacts lead to short circuits or phase failure.

  • Page 35: External Demand Via 0-10V Input

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service External Demand via 0–10V Input Connection at input 0 – 10V at extension EA1 (see page 113). 0 - 1V no default set supply temperature set value 50° F (10° C) set value 212°...

  • Page 36: External "Mixing Valve Closed"/"Mixing Valve Open

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service External “Mixing Valve Closed”/”Mixing Valve Open” Connection at plug aVD. Note: ‘Live’ contacts lead to short circuits or phase failure. The external connection must be floating. Codes External “Mixing valve External “Mixing valve...

  • Page 37: Making The Lon Connection

    Installation, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Making the LON Connection The Viessmann LON system is designed for the Connection with Viessmann LON cable “Line” BUS topology with a terminator at both ends (accessories). The transfer distances for LON are subject to the electrical properties of the respective cabling.

  • Page 38: Power Supply

    Power Supply Vitotronic 300, GW5B & MW1B Installation and Service Power Supply Legend L: Line N: Neutral G: Ground 1. Ensure that the main power supply to the control contains overcurrent protection with a minimum A Power supply 120VAC, 1PH, 60Hz, provide rating of 6A and 2-pole disconnect.

  • Page 39: Fitting The Control Unit Front

    Opening and Closing the Control Units Vitotronic 300, GW5B & MW1B Installation and Service Fitting the Control Unit Front Legend Note: Route the ribbon cable through retainer A. A Cable retaining tab Opening the Control Unit...

  • Page 40: Testing The High Limit Safety Cut-Out

    2. “Einstellungen” (Settings) 3. “Sprache” (Language) Deutsch DE (German) 4. Set the required language with Setting the Date and Time on the Vitotronic 300-K During commissioning, or after prolonged time out of use, the time and date need to be reset.

  • Page 41: Matching The Coding Addresses To The System Version

    Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Matching the Coding Addresses to the System Version Vitotronic 300, GW5B (set codes at every Vitotronic 300, GW5B - boiler control) Switching mode from standalone/weather compensated control to constant temperature control (see page 25).

  • Page 42: Selecting The Boiler Sequence At The Vitotronic 300-K

    Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Selecting the Boiler Sequence at the Vitotronic 300-K Subject to the set codes in the “Cascade” group and internal control calculations, the control unit offers various boiler sequences. Coding addresses that influence the boiler sequence: “38”...

  • Page 43: Connecting The Control Unit To The Lon

    Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Connecting the Control Unit to the LON Example of a multi boiler system Legend H The LON communication module must be fitted into A Vitotronic 300 GW5B B Vitotronic 300 GW5B every Vitotronic 300, GW5B (see page 61).
  • Page 44 Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Connecting the Control Unit to the LON (continued) Multi boiler system. Multi boiler system. Set code “01:2” in Set code “01:2” in group 2 “Boiler”. group 2 “Boiler”. Boiler number 1.
  • Page 45 Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Connecting the Control Unit to the LON (continued) Carrying out a LON participant check at the Vitotronic 300-K Communication with the system devices connected to the fault manager is tested by means of a participant check.

  • Page 46: Checking Actuators And Sensors At The Vitotronic 300 Gw5B

    Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Checking Actuators and Sensors at the Vitotronic 300 GW5B Testing the relay 1. Press OK and simultaneously for approx. 4 sec. 2. “Actuator test” Before an actuator is selected, all actuators are off.

  • Page 47: Vitotronic 300-K

    Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Checking Actuators and Sensors at the Vitotronic 300-K Carrying out a relay test 1. Press OK and simultaneously for approx. 4 sec. 2. “Actuator test” The following relay outputs can be controlled subject to the system equipment level:...

  • Page 48: Adjusting Heating Curves

    Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Adjusting Heating Curves The heating curves illustrate the relationship between the outside temperature and the boiler water or supply temperature. To put it simply: The lower the outside temperature, the higher the boiler water or supply temperature.
  • Page 49 Commissioning Vitotronic 300, GW5B & MW1B Installation and Service Adjusting Heating Curves (continued) Reduced set room temperature Changing the reduced room temperature from 37 to 57° F (3 to 14° C) Operating instructions Legend A Boiler water temperature or supply temperature...

  • Page 50: Calling Up The Service Menu

    Service Scans, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Calling up the Service Menu Service menu overview Press OK and simultaneously for approx. 4 sec. Service General Diagnosis Brief scan Reset data Actuator test Coding level 1...

  • Page 51: Calling Up Service Menu

    Service Scans, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Calling up the Service Menu Service menu overview Press OK and simultaneously for approx. 4 sec. Service General Diagnosis Heating circuit 1 HC1 Heating circuit 2 HC2 Actuator test...

  • Page 52: Brief Scan

    Note: The displays in fields 3 and 5 are the same. Scanning and Resetting Service Display No service interval can be set at the Vitotronic 300-K. In Note: If a service display appears on the Vitotronic 300, other words, no service display is shown.

  • Page 53: Fault Codes

    Troubleshooting, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Fault Codes Displayed fault System characteristics Cause Measures code Control mode. Service “0F” is only Service the appliance. displayed in the fault Note: After the service, set history.
  • Page 54 Troubleshooting, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Fault Codes (continued) Displayed fault System characteristics Cause Measures code Control mode. Butterfly valve configuration error: With butterfly valve: Code “0C:2”, “0C: Set code “4E:0” in group 1 3”...

  • Page 55: Fault Display

    Troubleshooting, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Fault Display In the event of a fault, the red fault display flashes at the  control unit. “Fault” is displayed and flashes. The fault code is displayed with OK.

  • Page 56: Fault Codes

    Troubleshooting, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Fault Codes Displayed System characteristics Cause Measures fault code Activates at 32 °F (0° C) Short circuit, outside temperature Check outside temperature outside temperature. sensor sensor (see page 110).
  • Page 57 Troubleshooting, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Boiler with maximum Short circuit, temperature sensor Check temperature sensor temperature, no output (see page 110). reduction, mixing valve return temperature control “Open”.
  • Page 58 Troubleshooting, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Control mode. Lead break, temperature sensor, Check sensor at the solar control unit connection at S3 of the Vitosolic (see separate installation and service instructions).
  • Page 59 Troubleshooting, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Fault Codes (continued) Displayed System Cause Measures fault code characteristics Control mode. Lead break, KM Check KM BUS cable and appliance. BUS to solar control module or Without solar control unit: Vitosolic Set code “54:0”...

  • Page 60: Boiler Temperature Control Of The Vitotronic 300 Gw5B

    Function Description Vitotronic 300, GW5B & MW1B Installation and Service Boiler Temperature Control of the Vitotronic 300 GW5B Brief description H The boiler water temperature is regulated by starting and stopping the burner or through modulation. H The set boiler water temperature is specified by the Vitotronic 300-K cascade control unit.
  • Page 61 Function Description Vitotronic 300, GW5B & MW1B Installation and Service Boiler Temperature Control of the Vitotronic 300, GW5B (continued) Switching hysteresis, burner Permanent switching hysteresis Code “04:0” Time Heat demand-dependent switching hysteresis The heat demand-dependent switching hysteresis takes the boiler load into account.

  • Page 62: Cascade Control Of The Vitotronic 300-K

    Function Description Vitotronic 300, GW5B & MW1B Installation and Service Cascade Control of the Vitotronic 300-K Brief description H With supplytemperature sensor: Set code “3B:1” or “3B:3” in the “Cascade” group. The supply temperature is regulated by starting or The control deviation is calculated from the set supply...
  • Page 63 Function Description Vitotronic 300, GW5B & MW1B Installation and Service Cascade Control of the Vitotronic 300-K (continued) Conventional strategy 1 Condensing strategy (code “3C:0” in the “Cascade” group) Benefit: As few boilers as possible are active. Example for the different control strategies Set code “3C:1”...
  • Page 64 Function Description Vitotronic 300, GW5B & MW1B Installation and Service Cascade Control of the Vitotronic 300-K (continued) Conventional strategy 1 (code “3C:1” in the “Cascade” Conventional strategy 2 (code “3C:2” in the “Cascade” group) group) Starting Starting Shutdown Shutdown...

  • Page 65: Heating Circuit Control Unit Of The Vitotronic 300

    Function Description Vitotronic 300, GW5B & MW1B Installation and Service Heating Circuit Control Unit of the Vitotronic 300-K Brief description Outside temperature A heating curve must be set for matching the control unit H The control unit has control circuits for one system to the building and the heating system.
  • Page 66 Function Description Vitotronic 300, GW5B & MW1B Installation and Service Heating Circuit Control Unit of the Vitotronic 300-K (continued) DHW temperature System dynamics Priority control You can influence the control characteristics of the mixing valves via coding address “C4” in the “Heating circuit...”...
  • Page 67 Function Description Vitotronic 300, GW5B & MW1B Installation and Service Heating Circuit Control Unit of the Vitotronic 300-K (continued) Supply temperature control Differential temperature: The differential temperature is adjustable via coding address “9F” in the “General” group, factory set condition 8 K.
  • Page 68 Function Description Vitotronic 300, GW5B & MW1B Installation and Service Heating Circuit Control Unit of the Vitotronic 300-K (continued) Example using the settings in the factory set condition Control sequence Mixing valve circuit The mixing valve motor will not be controlled within the “neutral zone”...

  • Page 69: Dhw Tank Temperature Control Of The Vitotronic 300-K

    Function Description Vitotronic 300, GW5B & MW1B Installation and Service DHW Tank Temperature Control of the Vitotronic 300-K Brief description Frost protection The DHW tank will be heated to 68° F (20° C) if the H The DHW tank temperature control is a constant DHW temperature sinks below 41°...
  • Page 70 Function Description Vitotronic 300, GW5B & MW1B Installation and Service DHW Tank Temperature Control of the Vitotronic 300-K (continued) Control sequence Code “55:2” in the “DHW” group, DHW tank temperature control with 2 DHW tank temperature sensors Code “55:0” in the “DHW” group, DHW tank heating DHW tank temperature sensor 1 enables the circulation The DHW tank goes cold (set value −2.5 K, adjustable...

  • Page 71: Calling Up Coding Level 1

    Code 1, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Calling up Coding Level 1 Prior to coding the Vitotronic 300 GW5B, ensure the boiler is in cascade mode. Refer to page 25. For the Vitotronic 300 GW5B, see boiler Service Instructions 1.

  • Page 72: Group 2 "Boiler

    Code 1, Code 2, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Group 2 “Boiler” Coding Coding in the factory set condition Possible change System design 01:2 Multi boiler system with cascade control 01:1 Single boiler system.

  • Page 73: Calling Up Coding Level 2

    Code 2, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Calling up Coding Level 2 Note: At coding level 2, all codes are accessible, including the codes at coding level 1. Codes that have not been assigned due to the heating system equipment level or the setting of other codes are not displayed.

  • Page 74: Group 1 "General

    Code 2, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Group 1 “General” (continued) Coding Coding in the factory set condition Possible change 00:0 Set automatically if code “01:2” is set. 00:1 No function. Boiler control unit is linked into the cascade.
  • Page 75 Code 2, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Group 1 “General” (continued) Coding Coding in the factory set condition Possible change 52:0 Do Not Adjust 54:0 Do Not Adjust 5B:0 Without extension EA1. 5B:1 With extension EA1; automatic recognition.
  • Page 76 Code 2, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Group 1 “General” (continued) Coding in the factory set condition Possible change 5F:0 Function input DE3 at extension EA1: 5F:1 No function. No function. 5F:2 No function.
  • Page 77 Code 2, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Group 1 “General” (continued) Coding in the factory set condition Possible change 80:6 If a fault occurs for at least 88:0 Immediate fault message. 30 sec., a fault message is displayed.

  • Page 78: Group 2 "Boiler

    Code 2, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Group 2 “Boiler” (continued) Coding in the factory set condition Possible change 01:2 Multi boiler system with cascade control via 01:1 Single boiler system. LON. 01:3 Do not adjust.

  • Page 79: Calling Up Coding Level 1

    Code 1, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Calling up Coding Level 1 Note: H The codes are displayed as plain text. H Codes that have no function due to the heating system equipment level or the setting of other codes are not displayed.

  • Page 80: General" Group

    Code 1, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “General” Group Coding Coding in the factory set condition Possible change System design 00:1 One system circuit A1 (heating circuit 00:2 For system schemes, see the following 1), without DHW heating table.

  • Page 81: Cascade" Group

    Code 1, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Cascade” Group Coding Coding in the factory set condition Possible change Number of boilers in cascade 35:4 4 boilers connected to the Vitotronic 35:1 1 to 4 boilers connected to the 300-K.

  • Page 82: Solar" Group

    Code 1, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Solar” Group Only in conjunction with solar control module, type SM1. Coding Coding in the factory set condition Possible change Speed control solar circuit pump 02:0 Solar circuit pump (multi stage) without...

  • Page 83: Heating Circuit 1", "Heating Circuit 2", "Heating Circuit 3" Group

    Code 1, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group Coding Coding in the factory set condition Possible change Priority DHW heating A2:2 DHW tank priority applicable to heating circuit...
  • Page 84 Code 1, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the factory set condition Possible change Extended economy function mixing valve Weather-compensated/room temperature hook-up B0:0...
  • Page 85 Code 1, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the factory set condition Possible change Slab curing function (Not used) F1:0 Slab curing function disabled. (Not used)

  • Page 86: Calling Up Coding Level 2

    Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Calling up Coding Level 2 Note: H In coding level 2, all codes are accessible, including the codes from coding level 1. H Codes that have no function due to the heating system equipment level or the setting of other codes are not displayed.

  • Page 87: General" Group

    Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “General” Group Coding Coding in the factory set condition Possible change 00:1 One system circuit A1 (heating circuit 1), 00:2 For system schemes, see the following table. without DHW heating.
  • Page 88 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “General” Group (continued) Coding in the factory set condition Possible change 4D:1 4D:0 Distribution pump. Connection at plug sL: Shunt pump. 4E:1 4E:2 Motor for 3-way mixing valve, primary store Connection at plug gSA1: system.
  • Page 89 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “General” Group (continued) Coding in the factory set condition Possible change 5F:0 Function input DE3 at extension EA1: 5F:1 Heating program changeover. No function. 5F:2 External demand with minimum set supply temperature.
  • Page 90 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “General” Group (continued) Coding in the factory set condition Possible change 84:7 Summer time starts: 84:1 Monday to Sunday Last Sunday of the selected month. 84:7 85:10 Wintertime starts:...
  • Page 91 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “General” Group (continued) Coding in the factory set condition Possible change 99:0 99:1 No function. Connection at terminals 2 and 3 in plug aVD 99:2 External “Mixing valve closed”...

  • Page 92: Cascade" Group

    Coding in the factory set condition Possible change 35:4 4 boilers connected to the Vitotronic 300-K. 35:1 1 to 4 boilers connected to the Vitotronic 300-K. 35:4 36:0 Electronic minimum system supply temperature 36:1 Minimum limit adjustable from 32 to 260° F limit set to 32°...

  • Page 93: Dhw" Group

    Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Cascade” Group (continued) Coding in the factory set condition Possible change 43:31 No ECO threshold boiler 3. 43:−30 ECO threshold boiler 3 adjustable from -22 to +86° F (−30 to +30° C).
  • Page 94 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “DHW” Group (continued) Coding in the factory set condition Possible change 62:10 Circulation pump with a run-on time after DHW 62:0 Circulation pump without run-on. tank heating of max. 10 min.

  • Page 95: Solar" Group

    Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Solar” Group Only in conjunction with solar control module, type SM1. Coding Coding in the factory set condition Possible change 00:8 The solar circuit pump starts when the...
  • Page 96 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Solar” Group (continued) Coding in the factory set condition Possible change 0D:1 Night circulation monitoring switched on. 0D:0 Night circulation monitoring switched off. Unintentional flow rate is captured in the solar circuit (e.g.
  • Page 97 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Solar” Group (continued) Coding in the factory set condition Possible change 23:4 Stop temperature differential for central heating 23:2 Stop temperature differential for backup: 4 K. central heating backup is adjustable...

  • Page 98: Heating Circuit 1", "Heating Circuit 2", "Heating Circuit 3" Group

    Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group Coding Coding in the factory set condition Possible change A0:0 Without remote control. A0:1 With Vitotrol 200A; automatic recognition.
  • Page 99 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the factory set condition Possible change A6:36 Extended economy control disabled. A6:5 Extended economy control enabled, i.e.
  • Page 100 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the factory set condition Possible change B6:0 With remote control: B6:1 With quick heat-up/quick setback (see Without quick heat-up/ quick setback.
  • Page 101 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the factory set condition Possible change D8:0 No heating program changeover via extension D8:1 Heating program changeover via input DE1 at extension EA1.
  • Page 102 Code 2, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the factory set condition Possible change F2:8 Time limit for party mode or external heating...

  • Page 103: Connection And Wiring Diagram

    Wiring, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Connection and Wiring Diagram A1 PCB, extension for heating circuit 2 and 3 with A9 Boiler coding card mixing valve (optional accessory) A10 LON communication module (accessories) A2 PCB, low voltage...
  • Page 104 Wiring, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Connection and Wiring Diagram (continued) Main PCB low voltage Legend Outdoor air temperature sensor (No function) aVD External hook-up § Boiler water temperature sensor aVG KM BUS participant...
  • Page 105 Wiring, Vitotronic 300, GW5B Vitotronic 300, GW5B & MW1B Installation and Service Connection and Wiring Diagram (continued) PCB 120V~ F1, F2 Fuse/MCB sÖA1 High temperature circuit pump K1-K10 Relay DHW circulation pump ON/OFF switch DHW recirculation pump Electrical interfaces Accessories pump Power supply, 120V/60 Hz fÖ...

  • Page 106: Connection And Wiring Diagram

    Wiring, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connection and Wiring Diagram Overview Legend PCB, extension for heating circuits 2 and 3 with mixing valve A10 LON communication module (accessory) A11 Power supply unit PCB PCB low voltage...
  • Page 107 Wiring, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connection and Wiring Diagram (continued) PCB 120V~ Legend Heating circuit pump fÖ Power supply, 120V/60 Hz sÖ Central fault message Circulation pump for DHW tank heating gÖ (accessory) Motor for 3-way mixing valve, primary store...
  • Page 108 Wiring, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connection and Wiring Diagram (continued) PCB low voltage Legend Outside temperature sensor External hook-up Supply temperature sensor KM BUS participant External hook-up %A DHW tank temperature sensor %B DHW tank temperature sensor 2 for primary store...
  • Page 109 Wiring, Vitotronic 300-K Vitotronic 300, GW5B & MW1B Installation and Service Connection and Wiring Diagram (continued) PCB, extension for heating circuits 2 and 3 with mixing valve Legend Supply temperature sensors Mixing valve motors sÖ Heating circuit pumps K1-K6 Relay fÖ...

  • Page 110: Sensors

    Components Vitotronic 300, GW5B & MW1B Installation and Service Sensors Boiler water, DHW tank, supply, return and room temperature sensors Note: H The supply temperature sensor can be used as a contact or immersion temperature sensor. Note: The supply temperature sensor in the mixing valve extension kit is a contact temperature sensor.

  • Page 111: Boiler Coding Card

    Components Vitotronic 300, GW5B & MW1B Installation and Service Boiler Coding Card Boiler Boiler coding card Display in brief scan Part no. Vitocrossal 200, type CM2 1042 7841113 Mixing Valve Motor Kit Components: H Mixing valve motor (not for flanged mixing valve)

  • Page 112: Extension Ea1 Accessory (Optional)

    Components Vitotronic 300, GW5B & MW1B Installation and Service Extension EA1 Accessory (optional) Duration of the heating program changeover Contact constantly closed: The changeover is active as long as the contact is closed. Contact only closed briefly via pushbutton: The changeover is enabled for the time selected in coding address “F2”...

  • Page 113: Parts List Vitotronic 300, Gw5B

    Parts Lists Vitotronic 300, GW5B & MW1B Installation and Service Parts List Vitotronic 300, GW5B Ordering Replacement Parts: Please provide model no. from rating plate and serial no. when ordering replacement parts. Order replacement components from your Viessmann distributor. Parts...

  • Page 114: Parts List Vitotronic 300-K

    Parts Lists Vitotronic 300, GW5B & MW1B Installation and Service Parts List Vitotronic 300-K Ordering parts The following information is required: H Serial no. (see type plate A) H Position number of the part (from this parts list) Obtain standard parts from your local supplier.

  • Page 115: Specification Vitotronic 300, Gw5B

    Specification Vitotronic 300, GW5B & MW1B Installation and Service Specification Vitotronic 300, GW5B Rated voltage 120V~ Rated frequency 60 Hz Rated current 2 x 6A~ Power consumption 10 W Permissible ambient temperature: During operation 32 to 104° F (0 to +40° C)
  • Page 116 Vitotronic 300, GW5B and MW1B Installation and Service...

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