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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 199
Floor mounted, gas-fired condensing
boiler with modulating MatriX gas burner.
For room air dependent or independent
operation.
H
5673 647 - 14
10/2019
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Summary of Contents for Viessmann Vitocrossal 300 Series
- Page 1 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 199 Floor mounted, gas-fired condensing...
- Page 2 CSA B51 and ASME Section IV. - Horizontal, vertical or hybrid sealed combustion double-pipe venting (field supplied). ■ Low Emission Combustion with Viessmann made - Horizontal or vertical single-wall venting (field supplied). stainless steel MatriX burner. Factory calibrated.
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Page 3: Cross Section
Product Information Vitocrossal 300 CU3A 26 to 199 Technical Data Cross-Section Vitocrossal 300 CU3A 26 to 199 Vitocrossal 300 CU3A boiler efficiency dependent on system heating water return temperatures and load conditions Product may not be exactly as shown Legend A Digital Vitotronic boiler control unit B Water-cooled stainless steel combustion chamber C Modulating MatriX gas burner –... -
Page 4: Technical Data
Technical Data Vitocrossal 300 CU3A 26 to 199 Technical Data Technical Data Boiler Model No. CU3A 26, 94 35, 125 45, 160 57, 199 Natural Gas / Liquid Propane Gas CSA input 19-94 25-125 43-160 43-199 (kW) (5.6-27.5) (7.3-36.6) (12.6-47) (12.6-58) CSA output / DOE heating capacity*1 17.7-87... - Page 5 For details refer to the Installation Instructions for the Vitocrossal 300 CU3A Venting System. Standby losses measured from the boiler temperature sensor well based on a boiler water temperature of 158°F (70°C) and a room temperature of 68°F (20°C). For information regarding other Viessmann System Technology componentry, please reference documentation of respective product.
- Page 6 Dimensional Information Vitocrossal 300 CU3A 26 to 199 Technical Data Models 300 CU3A 26 to 199 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 F Boiler return G Boiler drain H Vent connection...
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Page 7: Recommended Minimum Service Clearances
See the Vitocrossal 300 CU3A Venting Recommended minimum service clearances System Installation Instructions for details. For typical Vitocrossal CU3A series boiler installations, Viessmann recommends installing the boiler with the service clearances shown in the illustration. Minimum clearances to combustibles Boiler model CU3A... -
Page 8: Pressure Drop (Heating Water Side)
Waterside Flow Vitocrossal 300 CU3A 26 to 199 Technical Data Pressure Drop (heating water side) Flow rate Legend A Boiler models CU3A 26, 35, 94, 125 B Boiler models CU3A 45, 57, 160, 199 The Vitocrossal 300 is only suitable for fully pumped hot water heating systems. - Page 9 Boiler Control Vitocrossal 300 CU3A 26 to 199 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 –...
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Page 10: Design And Function
Boiler Control Vitocrossal 300 CU3A 26 to 199 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 You can select the following heating programs with the Control of one heating circuit without mixer and two ■... -
Page 11: Design And Functions
Boiler Control Vitocrossal 300 CU3A 26 to 199 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 Rated frequency: 60 Hz valve) and the supply temperature of the heating circuit... -
Page 12: Optional Accessories
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) Max. ambient temp. - at operation: 32ºF to 266ºF (0ºC to 130ºC) - Page 13 300A cannot be installed inside the main living room The mixing valve actuator is mounted directly on the or in a suitable position where the unit can capture and Viessmann ¾ to 2½ in. mixing valve. adjust the temperature. The mixing valve actuator is a motor-driven control unit.
- Page 14 Accessories Vitocrossal 300 CU3A 26 to 199 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) heating circuit and up to two remote controls may be (even if connecting connected to the control unit.
- Page 15 Accessories Vitocrossal 300 CU3A 26 to 199 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 CU3A boiler, the low-loss header acts as hydraulic break, Boiler Return decoupling boiler and system circuits from each other. Boiler Supply Viessmann recommends the use of a low-loss header Bypass (with laminar flow) in cases where the system head and flow rates are Debris and/or air unknown.
- Page 17 Accessories Vitocrossal 300 CU3A 26 to 199 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 >...
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Page 18: Standard Equipment
- The boiler comes prewired and fully piped internally for field connections. - Side wall vent installations must include Viessmann protective screen! - Enclosure finish: black steel, powder-coated Viessmann silver - The Vitocrossal 300 CU3A comes ready for use with natural gas and can be fuel converted to liquid propane gas in the field. -
Page 19: Hydraulic Connection
Vitocrossal 300 CU3A 26 to 199 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 199 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 Installation Examples Vitocrossal 300 CU3A 26 to 199 Technical Data System Layout 2 Vitocrossal 300 CU3A with... - DHW storage tank - one heating circuit with mixing valve and system separation Legend Installation of ... Vitocrossal 300 CU3A boiler with underfloor heating circuit with 3-way mixing valve ■...
- Page 22 Installation Examples Vitocrossal 300 CU3A 26 to 199 Technical Data System Layout 3 Vitocrossal 300 CU3A with... - DHW storage tank - one direct-connected heating circuit - two heating circuit with a mixing valve Legend Installation of different heating circuits... Vitocrossal 300 CU3A boiler with radiator heating circuit (high-temp.
- Page 23 Installation Examples Vitocrossal 300 CU3A 26 to 199 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) ■ Vitocrossal 300 CU3A boiler with Vitotronic 200, under floor heating circuit with 3-way mixing valve ■...
- Page 24 Installation Examples Vitocrossal 300 CU3A 26 to 199 Technical Data System Layout 5 Vitocrossal 300 CU3A with... - DHW storage tank - three zone circuits Legend Vitocrossal 300 CU3A boilers Installation of different heating circuits... DHW storage tank DHW production ■...
- Page 25 - 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 26 Proper installation and functionality in the field is the responsibility of the heating contractor. WARNING If a DHW storage tank other than a Viessmann Vitocell 100 or 300 tank is used, the installer must verify proper operation of the Viessmann DHW tank temperature sensor with the original manufacturer of the tank.
- Page 27 Proper installation and functionality in the field is the responsibility of the heating contractor. WARNING If a DHW storage tank other than a Viessmann Vitocell 100 or 300 tank is used, the installer must verify proper operation of the Viessmann DHW tank temperature sensor with the original manufacturer of the tank.
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Page 28: Electrical Connections
Wiring Vitocrossal 300 CU3A 26 to 199 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 supplied after servicing. - Page 29 Wiring Vitocrossal 300 CU3A 26 to 199 Technical Data Electrical Connections (continued) Legend Outdoor Temperature Sensor IMPORTANT Supply Temperature Sensor/Low Loss Header Boiler Temperature Sensor #1 Electrical installations must comply with the latest edition of: Boiler Temperature Sensor #2 In the U.S.A., the National Electrical Code (NEC), DHW Temperature Sensor ANSI/NFPA 70 and any other state, local codes and/or Ionization Electrode...
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Page 30: System Design Considerations
In this case, only those Flue gas system commercially available corrosion protection products Viessmann PP(s) (Polypropylene) concentric flue gas/ approved for boilers with domestic hot water heating fresh air systems for room air independent operation via single-wall heat exchangers (instantaneous plate (sealed combustion) and side wall venting are tested to heat exchangers or DHW tanks) must be used. - Page 31 194°F from the boiler with a heat exchanger. Viessmann (90°C). recommends the use of underfloor plastic tubing with an oxygen diffusion barrier.
- Page 32 Vitocrossal 300 CU3A 26 to 199 Technical Data...
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