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Viessmann Vitocrossal 300 CU3A Application Manual

Residential boiler
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Application Guide
Vitocrossal 300, CU3A
Residential Boiler

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Summary of Contents for Viessmann Vitocrossal 300 CU3A

  • Page 1 Application Guide Vitocrossal 300, CU3A Residential Boiler...

  • Page 3: Application

    © 2019 by Viessmann. All rights reserved. No part of this book may be used or reproduced in any manner whatsoever without prior written permission.

  • Page 5: Application

    Whether in customer’s specific requirements. In historically protected homes, modern short, Viessmann takes care of all your commercial buildings, or in large facil- needs, from start to finish. ities, Viessmann products meet every...
  • Page 6 Identifying Boiler Nomenclature dentifying Boiler Nomenclature Identifying Boiler Nomenclature Consecutive Number Generation of Boiler Fuel Types Efficiency Low Temperature Condensing Series Segment Heat Only Circuit Combi Combi Comfort Coiled Tubing Tank Stratified Loading tank Solar Heating For DHW Solar Heating Wall-Mounted Floor Standing...

  • Page 7: Application

    Identifying Boiler Nomenclature Identifying Boiler Nomenclature Identifying Application Codes Number of boilers in system Number of heating circuits 1, 2, 3 ... Boiler Segment Type of Circuits: Vitodens HC Heating Circuit Vitocrossal ZC Zone Circuit HC/ZC Combination System Vitorond Number of individual zones in system Segment / Series How system is zoned 100 Series...

  • Page 8: Application

    Recommended Product Applications Application Typical Supply Vitodens Vitodens Vitocrossal Vitorond Temperature 200/222-F 300 CU3A Baseboard / Fan Coil High 160 -190 °F Cast Iron Radiator Medium 140 -160 °F Panel Radiator Medium 120 -160 °F Radiant Floor Heating 80 -120 °F Indirect DHW High 160 -190 °F...
  • Page 9 Expansion tank Viessmann Vitotrol Multi-zone control check valve Purge assembly: Zone valve Hydronic air handler 24V Zone valve Circulator (sediment faucet and ball valve) Towel radiator Viessmann 3-way mixing valve Plate and frame heat exchanger 120 volt power with actuator motor...

  • Page 11: Table Of Contents

    Vitocrossal CU3A Application # Application Code Page Application 1 CU3X 1ZC1ZP .01 Application 2 CU3I 1ZC4ZV.01 Application 3 CU3I 1ZC4ZP .01 Application 4 CU3I 2ZC2ZP .01 Application 5 CU3I 3HC/ZC3ZP .01 Application 6 CU3I 3HC/ZC3ZP .02 Application 7 CU3I 3ZC9C.01 Application 8 2CU3I 3HC/ZC3ZP .01 Application 9...
  • Page 12 Vitocrossal CU3A, Technical Data Product Information Design Supply / Return 40ºC 30ºC 104ºF 86ºF Curve 0.5 Design Supply / Return 75ºC 60ºC 167ºF 140ºF Curve 1.4 Design Supply / Return 90ºC 70ºC 194ºF 158ºF Curve 1.8 System Partial Load In % ºF ºC ºC...
  • Page 13 Vitocrossal CU3A, Technical Data Product Information...
  • Page 14 Vitocrossal CU3A, Technical Data Boiler Dimensions - Models 300 CU3A 26 to 199...
  • Page 15 Vitocrossal CU3A, Technical Data Service Clearances...
  • Page 16 Vitocrossal CU3A, Technical Data Waterside Flow...
  • Page 17 Vitocrossal CU3A, Technical Data System Design Considerations...
  • Page 18 Vitocrossal CU3A, Technical Data Considerations...
  • Page 19 Wiring a Mixing Valve Extension Module Product Information Comm. Bus On Boiler Supply Sensor Mixing Module Notes/Comments When multiple 145 communication Pump accessories are being installed, 145 cables will need to be run from device to Power device. (Daisy Chain) Ensure to set the S1 switch to assign the mixing valve heating circuit.
  • Page 20 Vitocrossal CU3A, Technical Data Zone Control Wizard Setup System with 1 Zone Circuit Notes/Comments Power Boiler ON Setting of Time and Date Press Menu+OK buttons to access Service Menu Down Arrow to Service Functions Press OK Activate Yes/No Arrow up to YES Press OK Press OK at each screen to enter...
  • Page 21 Vitocrossal CU3A, Technical Data System with 2 Zone Circuits System with 3 Zone Circuits Operational Screen Information ZC Fixed Setpoint Configured ZC Weather Compensated Configured User Interface Details: Indication of ZC circuit boiler is configured for ZC1/ZC2/ZC3 use arrows left or right to select. Display will show when a ZC call is present and a symbol if ZC1/ZC2/ZC3 are configured...

  • Page 24: Application

    Vitocrossal CU3A Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point OR Weather Compensated This particular application represents a high mass boiler with a single system loop. When the ZC1 thermostat calls for heat, the boiler will turn on the configured 28/20 P3 pump providing the necessary flow. Depending on the ZC1 configuration, it is possible to provide either a fixed setpoint or a weather compensated control option.

  • Page 25: Application

    Application 1 - Operational Setup ... continued Further Considerations Notes/Comments...

  • Page 28: Application

    Vitocrossal CU3A Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point with 157 Pump Output In this system you have a Vitocrossal CU3A with an indirect water heater and a four-zone single temperature system. Upon a call for heat from one of the four zone thermostats, the respective zone valve will open. The end switch will provide a demand and the 28/20 output connected P3 pump will turn on providing a target boiler water temperature.

  • Page 29: Application

    Application 2 - Operational Setup ... continued Notes/Comments...

  • Page 32: Application

    Vitocrossal CU3A Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point w/no configured pump output If you are zoning with pumps, consider this application for your next install. This system shows a Vitocrossal CU3A with an indirect water heater and a four zone single temperature system. Upon a call for heat from a thermostat, the associated zone pump is energized by the multi-zone control.
  • Page 33 Application 3 - Operational Setup ... continued Further Considerations DHW Production Set timer schedule as desired. If DHW production possible at any time, program timer settings to 0:00 to 24:00 The HC1 settings are still available should an outdoor reset based zone be connected. Should mixing valve extension kits be used, adjust the outdoor reset settings as required.
  • Page 36 Vitocrossal CU3A Zone Control Wizard—2 ZC—ZC1 Setpoint Demand with ZC2 Weather Compensated This application features two heat circuits which operate at different temperatures. This particular drawing portrays ZC1 as a low temperature circuit and the air handler as a mid/high temperature circuit, ZC2. Although there are many different configurations, the setup below will operate ZC1 as an on/off function where an outdoor reset curve will be enabled during a thermostat call.
  • Page 37 Application 4 - Operational Setup ... continued Notes/Comments...
  • Page 40 Vitocrossal CU3A Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point with 157 Pump Output This application shows a low temperature heat circuit with 3-way mixing valve, a high temperature heating circuit ZC1 and an indirect DHW tank that is controlled by an aquastat. This application allows for simultaneous operation of both space heating and DHW, just remember to size your boiler accordingly.
  • Page 41 Application 5 - Operational Setup ... continued Further Considerations The HC1 settings are still available should an outdoor reset based zone be connected. Should mixing valve extension kits be used, adjust the outdoor reset settings as required. Notes/Comments...
  • Page 44 Vitocrossal CU3A Zone Control Wizard Setup 1 Zone Circuit: Fixed Set Point with 28/20 Pump Output This application shows 2 heat circuits with mixing valves, a high temperature zone circuit, and an indirect DHW tank. This system approach maximizes system efficiency, control and comfort through precise water monitoring. The ZC1 thermostat call for heat will enable 28/20 output to power the P3 pump providing flow in the unmixed temperature heating circuit.
  • Page 45 Application 6 - Operational Setup ... continued Notes/Comments...
  • Page 48 Vitocrossal CU3A Zone Control Wizard—3 ZC—ZC1 Setpoint Demand with ZC2 Weather Compensated This application shows 3 heating circuits, where a combination of pumps, zone valves and two types of call for heat are utilized. The ZC1 demand input comes from a Multizone Control which is responsible for accepting thermostat calls where a respective pump is enabled.
  • Page 49 Application 7 - Operational Setup Instructions... continued Notes/Comments...
  • Page 53 Vitocrossal CU3A Application 8 Operational Setup Instructions This application consists of a low temperature heat circuit with motorized mixing valve, a hot water forced air fan coil, indirect DHW and a 2-boiler cascade separated by a low loss header. This multi-boiler configuration offers greater flexibility in system design as it allows for increased system turndown, boiler redundancy, increased BTU inputs, and simultaneous operation of the heating and DHW.
  • Page 57 Vitocrossal CU3A Application 9 Operational Setup Instructions This application consists of a mid-temperature heat circuit, a low temperature heat circuit with motorized mixing valve, and a low temperature heat circuit with heat exchanger and mixing valve. This application is conducive to systems in which glycol must be incorporated for safety purposes.
  • Page 61 Vitocrossal CU3A Application 10 Operational Setup Instructions This application consists of a 4-boiler cascade, a single building loop and an indirect DHW. Designing a system in this way allows constant circulation of heated fluid throughout larger commercial buildings. This provides the ability to have unit specific heat emitters and controls to maximize the comfort within the building.
  • Page 62 Application Rules & Formulas Universal Hydronics Formula: BTUH GPM= BTUH= GPM x 500 x ΔT 500 x ΔT Piping & Tubing Properties Steel/Wrought Iron Pipe Content/ft Max Flow Rate Max Heat Carrying Size (gal) (GPM) Capability (BTUH) 1/2" .016 40,000 3/4"...
  • Page 63 Radiant Sizing: Estimating Radiant Tubing 6" OC Qty = FT of space x 2 12" OC Qty = FT of space x 1.2 Estimating BTUH for Radiant Floor Warming = 15-20 btuh/ft Floor Heating = 35-50 btuh/ft Expansion Tank Quick Sizer Finned Air Handler/ Cast...
  • Page 64 This is Viessmann and DHW storage tanks – all designed to achieve superior performance, The Viessmann Group is one of the reliability and energy savings. world’s leading manufacturers of Accountability for the environment and heating and renewable energy society, fairness when dealing with systems.
  • Page 65 Global presence, local commitment.
  • Page 68 Viessmann Manufacturing Company Inc. Waterloo, ON Canada 1-800-387-7373 www.viessmann.ca Viessmann Manufacturing Company Inc. USA Warwick, RI 02886, USA 1-800-288-0667 info@viessmann-us.com www.viessmann.com Technical information subject to change without notice. Printed in Canada 5855 442 - 03 10/2019...

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