Viessmann VITOCROSSAL 300 Technical Data Manual
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Viessmann VITOCROSSAL 300 Technical Data Manual

Viessmann VITOCROSSAL 300 Technical Data Manual

For operation with natural gas and liquid propane gas floor mounted, gas-fired condensing boiler heating input 19 to 199 mbh 5.6 to 58 kw
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Download this manual See also: Service Manual, Instruction and Installation Manual
Technical Data Manual
Model Nos. and pricing: see Price List
For operation with natural gas and liquid propane gas
Floor mounted, gas-fired condensing boiler
Heating input
19 to 199 MBH
5.6 to 58 kW
VITOCROSSAL 300
Product may not be exactly as shown
Vitocrossal 300
CU3A Series 26 to 57
Floor mounted, gas-fired condensing
boiler with modulating MatriX gas burner.
For room air dependent or independent
operation.
H
5673 647 - 01 04/2015

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Summary of Contents for Viessmann VITOCROSSAL 300

  • Page 1 For operation with natural gas and liquid propane gas Floor mounted, gas-fired condensing boiler Heating input 19 to 199 MBH 5.6 to 58 kW VITOCROSSAL 300 Product may not be exactly as shown Vitocrossal 300 CU3A Series 26 to 57 Floor mounted, gas-fired condensing boiler with modulating MatriX gas burner.

  • Page 2: Product Information

    Product Information Vitocrossal 300 CU3A 26 to 57 Technical Data Benefits Equipped with the industry’s first intelligent combustion management system and powerful control technology, the new generation Vitocrossal 300 CU3A gas-fired Floor mounted condensing boiler delivers unparalleled performance, reliability and comfort.

  • Page 3: Cross Section

    Product Information Vitocrossal 300 CU3A 26 to 57 Technical Data Cross-Section Vitocrossal 300 CU3A 26 to 57 Vitocrossal 300 CU3A boiler efficiency dependent on system heating water return temperatures and load conditions Product may not be exactly as shown Legend...

  • Page 4: Technical Data

    If the gas supply pressure exceeds the maximum gas supply pressure value, a separate gas pressure regulator must be installed upstream of the heating system. Note: For high altitude installation at 10,000 ft. the input for model Vitocrossal 300 CU3A will have an altitude de-ration of 18%.
  • Page 5 Based on maximum input rate. For side wall vent installations (coaxial system): Do not exceed max. equivalent length specified in the Installation Instructions of the Vitocrossal 300 CU3A Venting System. Do not attempt to common-vent Vitocrossal 300 CU3A with any other appliance.
  • Page 6 Dimensional Information Vitocrossal 300 CU3A 26 to 57 Technical Data Models 300 CU3A 26 to 57 Legend A Overall boiler height (boiler control open) B Overall boiler height (boiler control closed) C Safety header connection D Boiler supply E Gas connection...

  • Page 7: Recommended Minimum Service Clearances

    Minimum Clearances Vitocrossal 300 CU3A 26 to 57 Technical Data Recommended Minimum Service Clearances Note: The Vitocrossal 300 CU3A series boiler conforms to the zero inches vent clearance to combustibles testing requirements dictated by the boiler Harmonized Standard ANSI Z21.13. CSA/4.9...

  • Page 8: Pressure Drop (Heating Water Side)

    Legend A Boiler models CU3A 26 to 35 kW B Boiler models CU3A 45 to 57 kW The Vitocrossal 300 is only suitable for fully pumped hot water heating systems. ∆T = 20ºF (10 K) ∆T = 30ºF (15 K) ∆T = 40ºF (20 K)

  • Page 9: Boiler Control

    Boiler Control Vitocrossal 300 CU3A 26 to 57 Technical Data On-Board Vitotronic 200, HO1B Control Programming unit: Easy operation through: ■ – Plain text display with graphic ability – Large font and black & white depiction for good contrast – Context-sensitive help text –...

  • Page 10: Design And Function

    Boiler Control Vitocrossal 300 CU3A 26 to 57 Technical Data Design and Function Functions Setting the Operating Programs The heating system frost protection (see Weather-compensated control of the boiler water ■ frost protection function) applies to all heating programs. and/or supply temperature...

  • Page 11: Design And Functions

    Boiler Control Vitocrossal 300 CU3A 26 to 57 Technical Data Design and Functions (continued) Technical Data Heating Curve Adjustment (slope and shift) The control unit regulates the boiler water temperature Rated supply voltage: 120VAC (= supply temperature of heating circuit without mixing...

  • Page 12: Optional Accessories

    Accessories Vitocrossal 300 CU3A 26 to 57 Technical Data Sensors (supplied) (supplied) Boiler Temperature Sensor Outdoor Temperature Sensor The boiler temperature sensor is connected at the control unit for weather-responsive operation and is built into the boiler. Specification sensor type: Viessmann NTC 10K ohms at 77ºF (25ºC)
  • Page 13 Accessories Vitocrossal 300 CU3A 26 to 57 Technical Data Optional Accessories (continued) Mixing Valve Actuator Kit Room Temperature Sensor, Separate room temperature sensor as supplement to the Vitotrol 200A and 300A; to be used if the Vitotrol 200A or 300A cannot be installed inside the main living room...
  • Page 14 Accessories Vitocrossal 300 CU3A 26 to 57 Technical Data Optional Accessories (continued) Vitotrol 200A One Vitotrol 200A can be used for every heating circuit Connection: in a heating system. The Vitotrol 200A can regulate one - 2-core lead 18 AWG, length max. 164 ft. (50 m)
  • Page 15 Accessories Vitocrossal 300 CU3A 26 to 57 Technical Data Optional Accessories (continued) Vitotrol 300A One Vitotrol 300A can be used for every heating circuit RS function: in a heating system. The Vitotrol 300A can regulate up Installation in the main living room on an internal wall to three heating circuits.
  • Page 16 Fuel Conversion Label Kit (NG>LPG) Low-loss header design (Typical) (included in boiler technical literature set) The Vitocrossal 300 CU3A boiler comes factory set for operation with natural gas. All Vitocrossal 300 CU3A models can be field converted to operate with liquid propane gas (as well as back to natural gas as required).
  • Page 17 Accessories Vitocrossal 300 CU3A 26 to 57 Technical Data Accessories for Vitocrossal 300 CU3A Low-Loss Header (continued) IMPORTANT Principle of Operation When installing a low-loss header, the system mixed supply temperature (T3) must be calculated as follows: Vprimary < Vsecondary T1 >...

  • Page 18: Standard Equipment

    10.0 1.37 1.40 1.44 1.48 The Vitocrossal 300 CU3A boilers come equipped with Lambda Pro, the industry’s first intelligent combustion management system. The boiler adjusts automatically to any gas type and quality without the need for a fuel conversion kit.

  • Page 19: Hydraulic Connection

    Installation Vitocrossal 300 CU3A 26 to 57 Technical Data Hydraulic Connection System design Viessmann condensing boilers can generally be installed in any pumped hot water heating system (closed system). Minimum system pressure 14 psi. The boiler water temperature is limited to 194ºF (90ºC).

  • Page 20: System Layout

    Installation Examples Vitocrossal 300 CU3A 26 to 57 Technical Data System Layout 1 Vitocrossal 300 CU3A with a direct-connected heating circuit Legend Installation of ... A Vitocrossal 300 CU3A boiler with radiator heating circuit (high-temp. circuit) Vitotronic 200, KW6B outdoor reset control ■...

  • Page 21: System Layout 2

    Installation Examples Vitocrossal 300 CU3A 26 to 57 Technical Data System Layout 2 Vitocrossal 300 CU3A with... - DHW storage tank - one heating circuit with mixing valve and system separation Installation of ... Legend Vitocrossal 300 CU3A boiler with underfloor heating circuit with 3-way mixing valve ■...

  • Page 22: System Layout 3

    Installation Examples Vitocrossal 300 CU3A 26 to 57 Technical Data System Layout 3 Vitocrossal 300 CU3A with... - DHW storage tank - one direct-connected heating circuit - one heating circuit with a mixing valve Legend Installation of different heating circuits...

  • Page 23: System Layout 4

    Installation Examples Vitocrossal 300 CU3A 26 to 57 Technical Data System Layout 4 Vitocrossal 300 CU3A with... - direct-connected heating circuit - one heating circuit with system separation Installation of different heating circuits... Legend radiator heating circuit (high-temp. circuit) ■...

  • Page 24: System Layout 5

    - low-loss header - multiple heating circuits with mixing valves - one heating circuit without mixing valve When designing a system as illustrated above, please contact your local Viessmann Sales Representative for assistance. Legend Vitocrossal 300 CU3A boiler with Vitotronic *1 Contact your local Sales Representative for details.

  • Page 25: System Layout 6

    Installation Examples Vitocrossal 300 CU3A 26 to 57 Technical Data System Layout 6 Multiple (up to eight) Vitocrossal 300 CU3A with... - multiple heating circuits with mixing valves - low-loss header When designing a multiple Vitocrossal 300 CU3A system Legend...

  • Page 26: Electrical Connections

    Installation Examples Vitocrossal 300 CU3A 26 to 57 Technical Data Electrical Connections CAUTION WARNING DISCONNECT POWER BEFORE Label all wires prior to disconnection SERVICING BOILER. when servicing controls. Wiring errors can cause improper and dangerous operation. Verify proper operation If any of the original wires as after servicing.
  • Page 27 Installation Examples Vitocrossal 300 CU3A 26 to 57 Technical Data Electrical Connections (continued) Legend Outdoor Temperature Sensor Supply Temperature Sensor/Low Loss Header Boiler Temperature Sensor #1 Boiler Temperature Sensor #2 DHW Temperature Sensor Ionization Electrode Flue Gas temperature Sensor Boiler Pump...

  • Page 28: System Design Considerations

    Do not install an isolation valve between the boiler and Boiler location the low water cut-off. As a direct vent appliance, the Vitocrossal 300 CU3A can be installed for room air independent operation (sealed Water connections combustion) regardless of size and ventilation method Vitocrossal 300 CU3A boilers can be used in any fully of the room in which it is located.
  • Page 29 System Design Vitocrossal 300 CU3A 26 to 57 Technical Data System Design Considerations (continued) System layout Oxygen diffusion barrier underfloor tubing The max. boiler water temperature for space heating The boiler warranty does not cover leaks resulting from ■ and DHW production is 194°F (90°C). To minimize...
  • Page 30 Vitocrossal 300 CU3A 26 to 57 Technical Data...
  • Page 31 Vitocrossal 300 CU3A 26 to 57 Technical Data...
  • Page 32 Vitocrossal 300 CU3A 26 to 57 Technical Data...

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