Viessmann Vitotronic 300 Installation And Service Instructions Manual
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Viessmann Vitotronic 300 Installation And Service Instructions Manual

Type gw5b, vitotronic 300, type gw5b weather-compensated, digital boiler control unit for boiler model cm2 - 400, 500, 620 and 620 tx
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Installation and Service
Instructions
for use by heating contractor
Vitotronic 300, Type GW5B
Weather-compensated, digital boiler control unit
for boiler model CM2 - 400, 500, 620 and 620 TX
VITOTRONIC
Certified as a component
part for Viessmann boilers
5693 979 - 05 01/2015
300
r
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 Weather-compensated, digital boiler control unit for boiler model CM2 - 400, 500, 620 and 620 TX VITOTRONIC Product may not be exactly as shown IMPORTANT Read and save these instructions...

  • Page 2: Safety, Installation And Warranty Requirements

    This document describes Vitotronic 300 when used: Vitotronic 300, Type GW5B in a single boiler system For installation in or mounting on Viessmann boilers only. Applicable to the following control units Order No. 7134 555, 7143 156, 7511 362 from Serial No.

  • Page 3: Table Of Contents

    Table of Contents Vitotronic 300, GW5B Installation and Service Page Safety Safety, Installation and Warranty Requirements....2 Product documentation...........2 Licensed professional heating contractor....2 Advice to owner............2 Warranty...............2 Operating and Service Documentation......2 Product Information.............2 Overview of System Example........5 Preparing for Installation Designations in the System Example......5 System Example............6...
  • Page 4 Table of Contents Vitotronic 300, GW5B Installation and Service Page Coding 1 Calling Up Coding Level 1..........55 “General” Group............56 “Boiler” Group............57 “DHW” Group............58 “Solar” Group............58 “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group..........59 Coding 2 Calling Up Coding Level 2..........62 “General”...

  • Page 5: Overview Of System Example

    Preparing for Installation Vitotronic 300, GW5B Installation and Service Overview of System Example Boiler Characteristics Vitocrossal (CM2) Several heating circuits This system example is merely a GENERIC LAYOUT and must therefore be checked on site for completeness and function. The heating circuits must be regulated by an external control unit.

  • Page 6: System Example

    Preparing for IInstallation Vitotronic 300, GW5B Installation and Service System Example Single boiler system with two heating circuits with mixing valve Hydraulic installation scheme Note: This schematic diagram is a general example without shut-off valves or safety equipment. This does not replace the need for local engineering.

  • Page 7: Technical Data

    Preparing for Installation Vitotronic 300, GW5B Installation and Service System Example Technical Data (continued) Equipment required Pos. Designation Boiler Vitotronic 300 GW5B Boiler water temperature sensor ATS Boiler water temperature sensor KTS (connection at burner control unit) Neutralizing system ON/OFF switch (on site)
  • Page 8 Preparing for Installation Vitotronic 300, GW5B Installation and Service System example Technical Data (continued) Equipment required Pos. Designation Accessories Connection to safety equipment aBÖ (see page 20) Minimum pressure switch or limiter SDB Maximum pressure limiter SDB Low water cutoff...
  • Page 9 Preparing for Installation Vitotronic 300, GW5B Installation and Service System example (continued) Electrical installation scheme  PCB 120V...
  • Page 10 Preparing for Installation Vitotronic 300, GW5B Installation and Service System example (continued) Low voltage and mixing valve extension PCBs Required code Category Function 00:8 “General” Two heating circuits with mixing valve M2 (heating circuit 2) and M3 group (heating circuit 3) with DHW heating...

  • Page 11: Overview Of Electrical Connections

    Installation Sequence Vitotronic 300, GW5B Installation and Service Overview of Electrical Connections Strip the insulation from the cables as close to WARNING the terminals as possible, and bundle tightly to the corresponding terminals. Incorrect wiring can lead to serious injury from electrical Secure cables with cable ties.
  • Page 12 Installation Sequence Vitotronic 300, GW5B Installation and Service Overview of Electrical Connections (continued) Legend Inserting cables and applying strain relief Extension for heating circuits 2 and 3 with mixing valve Control unit fitted on the side of the boiler: (accessory module supplied separately) Route cables from below out of the cable trunking into the control unit.
  • Page 13 Installation Sequence Vitotronic 300, GW5B Installation and Service Overview of Electrical Connections (continued)

  • Page 14: Inserting Cables And Applying Strain Relief

    Installation Sequence Vitotronic 300, GW5B Installation and Service Inserting Cables and Applying Strain Relief Legend A Cables with moulded strain relief B Restrain cables with zip tie to cable lead Inserting the Boiler Coding Card Insert the boiler coding card through the recess in the cover into slot “X7”.

  • Page 15: Connect Sensors

    Installation Sequence Vitotronic 300, GW5B Installation and Service Connecting Sensors Fitting location for outside temperature sensor North or north-westerly wall, 6-8 ft. (2 to 2.5 m) above ground level; in multi storey buildings, in the upper half of the second floor.

  • Page 16: External Connection

    Installation Sequence Vitotronic 300, GW5B Installation and Service 120V External Connection Pumps 120V Available pump connections Legend sÖM1/A1 Heating circuit 1 pump A Pumps Heating circuit 2 pump sÖM2 B To the control unit Heating circuit 3 pump sÖM3 Rated current: 2A~...
  • Page 17 Installation Sequence Vitotronic 300, GW5B Installation and Service 120V External Connection (continued) 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 18: Connecting The Central Fault Message Facility

    Installation Sequence Vitotronic 300, GW5B Installation and Service Connecting the Central Fault Message Facility Rated voltage 120V~ Rated current max. 2A~...

  • Page 19: Connecting Actuators

    Installation Sequence Vitotronic 300, GW5B 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 C 24V Valve Actuator...

  • Page 20: Connection To Low Water Cut-Off Device

    Installation Sequence Vitotronic 300, GW5B Installation and Service Connection of Low Water Cut-off Device 1. Remove jumper between terminals 12 and 15. 2. Make connection as shown in diagram. CAUTION The diagram shown is only a simplified conceptual drawing of a typical low water cut off (LWCO) device.

  • Page 21: External Demand Via Switching Contact

    Installation Sequence Vitotronic 300, GW5B Installation and Service External Demand via Switching Contact Connection options: Plug aVH Extension EA1 (accessory) Connection Note: ‘Live’ contacts lead to short circuits or phase failure. The external connection must be floating. Burner operation is load-dependent if the contact is closed.

  • Page 22: External Block Via Switching Contact

    Installation Sequence Vitotronic 300, GW5B Installation and Service External Blocking via Switching Contact Connection options: Plug aBÖ Plug aVD Extension EA1 (accessory) Connection Note: ‘Live’ contacts lead to short circuits or phase failure. The external connection must be floating. Closing this contact leads to a controlled burner shutdown.

  • Page 23: External Heating Program Changeover

    Installation Sequence Vitotronic 300, GW5B Installation and Service External Heating Program Changeover Optional connections: Plug aVH Extension EA1 (accessory) Connection Note: ‘Live’ contacts lead to short circuits or phase failure. The external connection must be potential- free. A Floating contact...

  • Page 24: Provisional Burner Operation

    Installation Sequence Vitotronic 300, GW5B Installation and Service Provisional Burner Operation Remove jumper across terminals 16 and 17 (not shown) and connect terminals 16 and 18 external control via dry contact (heat demand on close). Upon heat demand the boiler will maintain low fire until modulation is externally controlled through BMS.

  • Page 25: Power Supply

    Installation Sequence Vitotronic 300, GW5B Installation and Service Power Supply Legend A Power supply 120V~ B Fuse C Mains isolator, two-pole (on-site) D Boiler junction box (on site) F3 Fuse 3 250VAC 6.3A...
  • Page 26 Installation Sequence Vitotronic 300, GW5B Installation and Service Power Supply (continued) 40 Power cable Note: Route 120V cables B separately. Power cable 40 is supplied pre-wired to the junction box. Route beneath the top rail A using plug-in cable retainers.
  • Page 27 Installation Sequence Vitotronic 300, GW5B Installation and Service Power Supply (continued) Connecting the power supply to the burner base For burner base unit, see boiler service instructions 1. Check whether the power cable to the control unit has appropriate fuse protection.

  • Page 28: Boiler Control And Junction Box

    Installation Sequence Vitotronic 300, GW5B Installation and Service Boiler Control and Junction Box 1. Install the junction box to the rear panel either right or left. Secure the junction box with four 4.8 mm metal screws. 2. Route cables from control through the opening in the control panel.

  • Page 29: Mounting The Control Unit

    Installation Sequence Vitotronic 300, GW5B Installation and Service Mounting the Control Unit Legend A Cable retaining tab Note: Route the ribbon cable through retainer A. Opening the Control Unit...

  • Page 30: Setting The Language

    Commissioning Vitotronic 300, GW5B Installation and Service Setting the Language At the commissioning stage, the display is in German (default setting). Extended menu: 2. “Einstellungen” (Settings) 3. “Sprache” (Language) Deutsch DE (German) 4. Set the required language with Setting the Date and Time...

  • Page 31: Checking Actuators And Sensors

    Commissioning Vitotronic 300, GW5B Installation and Service Checking Actuators and Sensors Testing the relay 1. Press OK and simultaneously for approx. 4 sec. 2. “Actuator test” Before an actuator is selected, all actuators are off. The following actuators (relay outputs) can be switched subject to system equipment level:...

  • Page 32: Adjusting Heating Curves

    Commissioning Vitotronic 300, GW5B Installation and Service Adjusting Heating Curves Slope 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 33 Commissioning Vitotronic 300, GW5B Installation and Service Adjusting Heating Curves (continued) Changing the slope and shift Individually adjustable for each heating circuit. Extended menu: 2. “Heating” 3. Select heating circuit. 4. “Heating curve” 5. “Slope” or “Shift” 6. Select heating curve according to the system requirements.

  • Page 34: Connecting The Control Unit To The Lon

    Commissioning Vitotronic 300, GW5B Installation and Service Connecting the Control Unit to the LON The LON communication module (accessory) must be plugged in. Installation instructions LON communication module Note: The data transfer via LON can take several minutes. Single boiler system with Vitotronic 200-H and...

  • Page 35: Integrating A Control Unit Into The Lon

    Commissioning Vitotronic 300, GW5B Installation and Service Integrating a Control Unit into the LON Carrying out a LON participant check The participant check is used to test communication with the system devices connected to the fault manager. Preconditions: The control unit must be programmed as fault manager (code “79:1”...

  • Page 36: Calling Up The Service Menu

    Service Scans Vitotronic 300, GW5B 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 Heating circuit 3 HC3...

  • Page 37: Operating Data

    Service Scans Vitotronic 300, GW5B Installation and Service Operating Data Calling up operating data Operating data can be scanned in six areas (see “Diagnosis” in the “Service” menu overview). Operating data on heating circuits with mixing valves and solar can only be called up if the components are installed in the system.

  • Page 38: Brief Scan

    Service Scans Vitotronic 300, GW5B Installation and Service Brief Scan In the brief scan, you can call up temperatures, software versions and connected components, for example. 1. Press OK and simultaneously for approximately 4 seconds. 2. “Diagnosis” 3. “Brief scan”.

  • Page 39: Display

    Service Scans Vitotronic 300, GW5B Installation and Service Display Fault display Maintenance display In the event of a fault, the red fault display flashes Set limits in coding addresses “1F”, “21” and “23” at the control unit. “Fault” is displayed and flashes.

  • Page 40: Fault Codes

    Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes Displayed System characteristics Cause Measures fault code Control mode. Service “0F” is only displayed in Service required the fault history. Note: After servicing, set code “24:0”. Operates as if the outside...
  • Page 41 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code With primary store system: Short circuit, DHW tank Check the DHW tank temperature sensor 2. temperature sensor DHW tank heating is started (see page 84).
  • Page 42 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Burner control unit in a fault Short circuit, boiler water Check lead and dual sensor; state; system cools down; burner temperature sensor, burner replace sensor if required.
  • Page 43 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Control mode Lead break, temperature sensor Check temperature sensor aÖ aÖ, connection at solar control (see separate installation and module. service instructions). Check coding address “20” in the “Solar”...
  • Page 44 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Control mode, DHW tank may be Primary store system Insert plug aJB and check cold configuration fault: codes. Code “55:3” has been selected in the “DHW”...
  • Page 45 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Control mode Lead break, KM BUS to solar Check KM BUS cable and control module or Vitosolic. appliance. Without solar control unit: Set code “54:0” in the “General”...
  • Page 46 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Control mode Input DE2 at extension EA1 Remove fault at appliance reports a fault. concerned. Control mode Input DE3 at extension EA1 Remove fault at appliance reports a fault.
  • Page 47 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Operation according to internal Communication fault, burner Check plug and KM BUS burner control unit defaults. control unit. to burner control unit. Burner control unit in a fault Flue gas excess temperature;...
  • Page 48 Troubleshooting Vitotronic 300, GW5B Installation and Service Fault Codes (continued) Displayed System characteristics Cause Measures fault code Air pressure switch shows no air Air pressure switch is faulty, Remove flue gas back pressure; pressure, fan not running. incorrectly connected or check if condensate banked up;...

  • Page 49: Boiler Water Temperature Control

    Function Description Vitotronic 300, GW5B Installation and Service Boiler Water Temperature Control Brief description Emissions test function The boiler water temperature is regulated by The following functions are activated: modulating the burner. Burner start The set boiler water temperature is determined from...
  • Page 50 Function Description Vitotronic 300, GW5B Installation and Service Heating Circuit Control Unit (continued) Room temperature Heating circuit pump logic – Economy circuits In conjunction with the remote control and room The heating circuit pump is switched off temperature hook-up (coding address “B0” in the [set supply temperature set to 32°...
  • Page 51 Function Description Vitotronic 300, GW5B Installation and Service Heating Circuit Control Unit (continued) Supply temperature control System dynamics You can influence the control characteristics of the mixing valves via coding address “C4” in the “Heating circuit...” group. Central control Central control for a heating circuit can be programmed via coding address “7A”...
  • Page 52 Function Description Vitotronic 300, GW5B Installation and Service Heating Circuit Control Unit (continued) Example using the settings in the delivered condition Raising the reduced room temperature During operation with reduced room temperature, the reduced set room temperature can be automatically raised subject to the outside temperature.

  • Page 53: Dhw Tank Temperature Control

    Function Description Vitotronic 300, GW5B Installation and Service DHW Tank Temperature Control Brief description Priority control The DHW tank temperature control is a constant With priority control: (code “A2:2” in the “Heating temperature control. This is the result of starting circuit...”...
  • Page 54 Function Description Vitotronic 300, GW5B Installation and Service DHW Tank Temperature Control (continued) Control sequence Code “55:2” in the “DHW” group, DHW tank temperature Code “55:0” in the “DHW” group, DHW tank heating control with 2 DHW tank temperature sensors The DHW tank goes cold (set value −2.5 K, adjustable...

  • Page 55: Calling Up Coding Level 1

    Code 1 Vitotronic 300, GW5B Installation and Service Calling Up Coding Level 1 The codes are divided into groups and are displayed as plain text: – “General” – “Boiler” – “DHW” – “Solar” – “Heating circuit 1/2/3” – “All codes std device”...

  • Page 56: General" Group

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

  • Page 57: Boiler" Group

    Code 1 Vitotronic 300, GW5B Installation and Service “General” group (continued) Coding in the delivered condition Possible change General 8F:0 Operation in the standard menu and 8F:1 Operation in standard menu and extended menu extended menu enabled. blocked. Note: The respective code is only...

  • Page 58: Dhw" Group

    Code 1 Vitotronic 300, GW5B Installation and Service “DHW” group Coding in the delivered condition Possible change 67:40 For solar DHW heating: 67:0 No set value 3. Set DHW temperature 104°F (40°C). Reheating is suppressed above the selected 67:10 Set DHW temperature adjustable from set temperature (DHW heating by the boiler 50 to 203°F (10 to 95°C)

  • Page 59: Heating Circuit 1", "Heating Circuit 2", "Heating Circuit 3" Group

    Code 1 Vitotronic 300, GW5B Installation and Service “Solar” Group (continued) Only in conjunction with solar control module, type SM1. Coding in the delivered condition Possible change Extended solar control functions 20:0 No extended control function enabled. 20:1 Additional function for DHW heating.
  • Page 60 Code 1 Vitotronic 300, GW5B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the delivered condition Possible change Extended economy function mixing valve A7:0 Only for heating circuits with mixing valve: A7:1 With mixing valve economy function Without mixing valve economy function.
  • Page 61 Code 1 Vitotronic 300, GW5B Installation and Service “Heating Circuit 1”, “Heating Circuit 2”, “Heating Circuit 3” Group (continued) Coding in the delivered condition Possible change Heating program - changeover D5:0 With external heating program changeover D5:1 The heating program changes to “Constant (observe setting for coding addresses “5D”,...

  • Page 62: Calling Up Coding Level 2

    Code 2 Vitotronic 300, GW5B Installation and Service Calling Up Coding Level 2 All codes are accessible in coding level 2. The codes are divided into groups: – “General” – “Boiler” – “DHW” – “Solar” – “Heating circuit 1/2/3” – “All codes std device”...

  • Page 63: General" Group

    Code 2 Vitotronic 300, GW5B Installation and Service “General” Group Coding in the delivered condition Possible change System design 00:1 One heating circuit without mixing valve A1 00:2 For system schemes, see the following table. (heating circuit 1), without DHW heating.
  • Page 64 Code 2 Vitotronic 300, GW5B Installation and Service “General” Group (continued) Coding in the delivered condition Possible change 2E:0 Without wireless outside temperature sensor. 2E:1 With wireless outside temperature sensor; automatic recognition. Not used, don’t adjust. 2E:2 Wireless outside temperature sensor not used, don’t adjust.
  • Page 65 Code 2 Vitotronic 300, GW5B Installation and Service “General” Group (continued) Coding in the delivered condition Possible change 5D:0 Function input DE1 at extension EA1: 5D:1 Heating program changeover. No function. 5D:2 External demand with set minimum boiler water temperature. Setting of the set value in coding address “9B”.
  • Page 66 Code 2 Vitotronic 300, GW5B Installation and Service “General” Group (continued) Coding in the delivered condition Possible change 76:0 Without LON communication module. 76:1 With LON communication module (automatic recognition). 77:1 LON participant number. 77:2 LON participant number, adjustable from 1 to 99:...
  • Page 67 Code 2 Vitotronic 300, GW5B Installation and Service “General” Group (continued) Coding in the delivered condition Possible change 87:7 Summer time starts: 87:1 Monday to Sunday Last Sunday of the selected month. 87:7 88:0 Temperature displayed in °C (Celsius). 88:1 Temperature displayed in °F (Fahrenheit).
  • Page 68 Code 2 Vitotronic 300, GW5B Installation and Service “General” Group (continued) Coding in the delivered condition Possible change 99:0 Connection at terminals 2 and 3 in plug 99:1 No function. aVD disabled (External blocking/ External 99:2 External “Mixing valve closed” Heating circuit “Mixing valve closed”) (see page 23).

  • Page 69: Boiler" Group

    Code 2 Vitotronic 300, GW5B Installation and Service “Boiler” Group Coding in the delivered condition Possible change 0C:0 Do Not Adjust 1F:0 With flue gas temperature sensor: 1F: 34 (1) When the limit for the flue gas temperature is Flue gas temperature is not monitored for exceeded, is displayed.
  • Page 70 Code 2 Vitotronic 300, GW5B Installation and Service “DHW” Group (continued) Coding in the delivered condition Possible change 59:0 DHW tank heating: 59:1 Start point adjustable from Set start point –2.5 K 1 to 10 K below set value. Set stop point +2.5 K...

  • Page 71: Solar" Group

    Code 2 Vitotronic 300, GW5B Installation and Service “DHW” Group (continued) Coding in the delivered condition Possible change 68:8 With 2 DHW tank temperature sensors 68:2 Factor adjustable from 0.2 to 1; (code “55:2”): DHW tank heating stop point 1 step ≙ 0.1 at set value x 0.8.
  • Page 72 Code 2 Vitotronic 300, GW5B Installation and Service Calling up coding level 2 “Solar” Group (continued) Coding in the delivered condition Possible change 06:75 Maximum speed of the solar circuit pump 06:1 Maximum speed of the solar circuit pump is 75% of the maximum possible speed.
  • Page 73 Code 2 Vitotronic 300, GW5B Installation and Service “Solar” Group (continued) Coding in the delivered condition Possible change 12:20 Minimum collector temperature (minimum 12:0 No minimum limit enabled. start temperature for the solar circuit pump) 12:1 Minimum collector temperature adjustable from 1 68°F (20°C).

  • Page 74: Heating Circuit 1", "Heating Circuit 2", "Heating Circuit 3" Group

    Code 2 Vitotronic 300, GW5B Installation and Service “Heating circuit 1”, “Heating circuit 2”, “Heating circuit 3” Group Coding in the delivered condition Possible change A0:0 Without remote control. A0:1 With Vitotrol 200; automatic recognition. A0:2 With Vitotrol 300 or Vitohome 300;...
  • Page 75 Code 2 Vitotronic 300, GW5B Installation and Service “Heating circuit 1”, “Heating circuit 2”, “Heating circuit 3” Group (continued) Coding in the delivered condition Possible change A4:0 With frost protection. A4:1 No frost protection; this setting is only possible if code “A3:– 9” has been selected.
  • Page 76 Code 2 Vitotronic 300, GW5B Installation and Service “Heating circuit 1”, “Heating circuit 2”, “Heating circuit 3” Group (continued) Only in conjunction with solar control module, type SM1. Coding Coding in the delivered condition Possible change B0:0 With remote control:*2...
  • Page 77 Code 2 Vitotronic 300, GW5B Installation and Service “Heating circuit 1”, “Heating circuit 2”, “Heating circuit 3” Group (continued) Coding in the delivered condition Possible change B9:0 With remote control unit and for the B9:1 With learning start optimization. heating circuit, operation with room...
  • Page 78 Code 2 Vitotronic 300, GW5B Installation and Service “Heating circuit 1”, “Heating circuit 2”, “Heating circuit 3” Group (continued) Coding in the delivered condition Possible change E1:1 With remote control Vitotrol 200 and 300: E1:0 Set day temperature adjustable from Set day temperature adjustable at the remote 37 to 73°F (3 to 23°C).

  • Page 79: Connection And Wiring Diagram

    Designs Vitotronic 300, GW5B 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 A11 Power supply unit PCB...
  • Page 80 Designs Vitotronic 300, GW5B 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 81 Designs Vitotronic 300, GW5B Installation and Service Connection and Wiring Diagram (continued) Low voltage PCB Outdoor temperature sensor (ATS) LON Cable for data exchange between control units %A DHW temperature sensor (accessories) %B DHW temperature sensor 2 for primary store...
  • Page 82 Designs Vitotronic 300, GW5B Installation and Service Connection and Wiring Diagram (continued) PCB, extension for heating circuit 2 and 3 with mixing valve (accessory) ?M2/M3 Supply temperature sensors sÖM2/M3 Heating circuit pumps fÖ Internal power supply gSM2/M3 Mixing valve motors Refer to extension for heating circuits 2 &...

  • Page 83: Sensors

    Temperature Flue gas temperature sensor, part no. 7452 531 Viessmann NTC 20 kΩ (orange identification) When a limit entered in the Vitotronic 300, GW5B is reached (see coding address “1F” in group 2 “Boiler”), a service message appears. 1. Disconnect plug aG.

  • Page 84: Mixing Valve Motor Kit

    Components Vitotronic 300, GW5B Installation and Service Mixing Valve Motor Kit Components: Mixing valve motor, with 13 ft. (4.0 m) connecting cable (not for flanged mixing valve) Plug for connecting the heating circuit pump Supply temperature sensor as contact temperature sensor for capturing the supply temperature, with 19 ft.

  • Page 85: Extension Ea1 Accessory (Optional)

    Components Vitotronic 300, GW5B 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 86: Parts List

    Parts Vitotronic 300, GW5B Installation and Service Parts List 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 0001 Hinge 0008 Supporting stay 0011 Safety valve with wiring...

  • Page 87: Specifications

    Specification Vitotronic 300, GW5B Installation and Service Specifications Rated voltage 120V~ Rated frequency 60 Hz Rated current 2 x 6A~ 250V~ Power consumption 10 W Permissible ambient temperature: During operation 32 to 104°F (0 to +40°C) Installation in living spaces or boiler rooms (standard...
  • Page 88 Vitotronic 300, GW5B Installation and Service...

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