Viessmann Vitocrossal 300 CU3A Installation Instructions Manual
Rigid and flex pipe venting systems
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- Application manual (68 pages) ,
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Summary of Contents for Viessmann Vitocrossal 300 CU3A
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Page 1: Installation Instructions
Installation Instructions for use by heating contractor Vitocrossal 300 CU3A Rigid and Flex Pipe Venting Systems Product may not be exactly as shown IMPORTANT Read and save these instructions for future reference. Please file in service binder 5673 654 - 04 08/2015... -
Page 2: Safety, Installation And Warranty Requirements
How these Installation Instructions are Structured..These Instructions cover the following venting systems Information specific to... for the Vitocrossal 300 CU3A boilers. Side Wall Vent Installations (Coaxial) is found in the Refer to the section applicable to your application for Side Wall Vent Installation Section starting on page 14. -
Page 3: Table Of Contents
Table of Contents CU3A Venting Systems Installation Page Safety Safety, Installation and Warranty Requirements....2 How these Installation Instructions are Structured...2 Important Regulatory and Installation Requirements..7 Operation with balanced flue using coaxial vent system..............8 Vent termination location requirements (for installations in Canada)........9 Vent termination location requirements (for installations in the U.S.A.)........9 Common Venting.............9... - Page 4 Table of Contents CU3A Venting Systems Installation Page Direct Venting Exhaust Vent/Air Intake Requirements......24 General requirements..........24 (Two-pipe System) Combustion Air Supply...........24 General Installation Information........25 Installation steps (outline)........25 Exhaust and combustion air piping material....25 Approved materials for two-pipe system....26 Vent Requirements - Stainless Steel......27 Additional requirements for stainless steel vent pipe material..............27 Exhaust vent/air intake connection to boiler....27...
- Page 5 Table of Contents CU3A Venting Systems Installation Page Single Pipe Venting Venting - Single Pipe (Room Air Dependent)....43 Vent Requirements............43 (Room Air Dependent) Combustion air supply..........43 General Installation Information........44 Installation steps (outline)........45 Exhaust vent pipe material........45 Approved material for single pipe vent system...46 Support system.............46 Flashing and storm collar installation......46 Additional requirements for stainless steel...
- Page 6 Table of Contents CU3A Venting Systems Installation Page General Information General Flexible Pipe Installation Information....59 Vent system manufacturers........59 Exhaust vent installation steps.........60 Recommended venting practice.......61 Ceiling / roof opening..........61 Direct Venting Combustion Air Supply..........62 Venting Options (Two-Pipe System)......63 (Two-pipe System) Vent Requirements - Flexible Vent System / Connector Pipes............64 Additional requirements for UL/ULC-listed flexible...
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Page 7: Important Regulatory And Installation Requirements
Safety CU3A Venting Systems Installation Important Regulatory and Installation Requirements For installations on the Commonwealth of Massachusetts, the following modifications to NFPA-54 chapter 10 apply: Excerpt from 248 CMR 5-08: 2(a) For all side-wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side-wall exhaust vent termination is less than (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:... -
Page 8: Operation With Balanced Flue Using Coaxial Vent System
Safety CU3A Venting Systems Installation Important Regulatory and Installation Requirements (continued) The Vitocrossal 300 CU3A boiler, flue gas adaptor is IMPORTANT approved under CSA 4.9. ANSI Z21.13 Standard. The venting system components are tested and listed ULC When replacing parts, use original Viessmann or Viessmann S636 or UL 1738 and are marked and labelled on each approved replacement parts. -
Page 9: Vent Termination Location Requirements
Safety CU3A Venting Systems Installation Important Regulatory and Installation Requirements (continued) Vent termination location requirements (for installation in Canada) The vent must be installed observing local regulations in addition to National Codes, CAN/CSA-B149.1 or 2. A vent must NOT terminate... 8...underneath a veranda, porch or deck, unless: 1...directly above a paved sidewalk or paved driveway which is located between two single-family dwellings and... -
Page 10: For Coaxial Venting Systems Only
0 in. (mm) 0 in. (mm) 0 in. (mm) 0 in. (mm) For details refer to Vitocrossal 300 CU3A Installation Instructions (as may be applicable). For coaxial venting systems only WARNING The venting system may be concealed in a chase. -
Page 11: About These Installation Instructions
General Information CU3A Venting Systems Installation About These Installation 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. WARNING Warnings draw your attention to the presence of Indicates an imminently hazardous situation which, potential hazards or important product information. -
Page 12: General Rigid Pipe Installation Information
The following Coaxial and PP(s) vent system manufacturers WARNING may be contacted for assistance in designing the appropriate venting system for Vitocrossal 300 CU3A boilers. Ensure that the entire venting system is protected from physical damages. A damaged venting system may M&G / Duravent... -
Page 13: Recommended Venting Practice
Route the flue gas connection to be free of load and torque stresses. We recommend fitting an on-site support immediately downstream of the boiler flue connection. WARNING The Vitocrossal 300 CU3A boiler cannot be common vented with any other appliances including additional Vitocrossal 300 CU3A boilers. -
Page 14: Side Wall Venting Layouts
7. Reinstall the inspection port bolt 1 and tighten bolt G Straight pipe (short) to seal. H 45° elbow The Vitocrossal 300 CU3A requires a coaxial venting I Vent termination adaptor. This adaptor must be ordered separately through J Protective screen (Viessmann) the vent manufacturer. -
Page 15: Coaxial Vent Adaptor
Side Wall Vent Installation (Coaxial) CU3A Venting Systems Installation Coaxial Vent Adaptor Centrotherm Coaxial Adaptor for CU3A 45, 57 Centrotherm Coaxial Adaptor for CU3A 26, 35 Centrotherm Coaxial Adaptor CU3A model # 26, 35 45, 57 ØA (nominal) ØB (nominal) ØC (nominal) -
Page 16: Coaxial Vent Termination
Side Wall Vent Installation (Coaxial) CU3A Venting Systems Installation Coaxial Vent Termination IMPORTANT Potential gaps between the vent-air intake and the surrounding construction which may cause air, rain or flue gases to leak into the wall or the building, must be sealed with approved outdoor sealant/caulking to prevent leakage of any kind. -
Page 17: Vent Length
Side Wall Vent Installation (Coaxial) CU3A Venting Systems Installation Venting Length Coaxial adaptor installation Note: This installation procedure is only required for the CU3A 45, 57 and not for the CU3A 26, 35. 1. Remove the inspection port bolt 1 from the top of the vent connection (as shown). -
Page 18: Vertical Venting Layouts
F Straight pipe (short) Ensure that the venting system is properly supported; the G 45° elbow Vitocrossal 300 CU3A boilers are not designed to support H Roof flashing and storm collar the weight of the venting system. I Roof coaxial termination... -
Page 19: General Installation Examples
Consult the vent manufacturer if using two-pipe Ensure that the venting system is properly supported; the to coaxial adaptor directly at the back of the boiler. Vitocrossal 300 CU3A boilers are not designed to support the weight of the venting system. Coaxial adaptor installation Note: This installation procedure is only required for the CU3A 45, 57 and not for the CU3A 26, 35. -
Page 20: Component Installation Guide
Vertical Vent Installation (Coaxial) CU3A Venting Systems Installation Component Installation Guide Coaxial vent termination installation Ceiling opening information Vent system Opening Ø 80/125 5a in. (133 mm) M&G, InnoFlue, PolyFlue, Z-Flex. ECCO MFG 100/150 6e in. (160 mm) M&G, PolyFlue 110/160 in. -
Page 21: Vent Termination Location Requirements
Vertical Vent Installation (Coaxial) CU3A Venting Systems Installation Component Installation Guide (continued) Vent termination location requirements The vent must be installed observing local regulations in addition to National Codes, CAN/CSA-B149.1 or 2 (for installations in Canada) or ANSI-Z223.1 or NFPA 54 (for installations in the U.S.A.). -
Page 22: Installation Of Support System
wall band extension guy wire band roof brace. IMPORTANT Ensure that the venting system is properly supported; the Vitocrossal 300 CU3A boiler is not designed to support the weight of the venting system. -
Page 23: Vent Length Requirements
Vertical Vent Installation (Coaxial) CU3A Venting Systems Installation Vent Length Requirements Maximum vent length with increasers Maximum vent length Model No. CU3A 26, 35 System vent size 80/125 100/150* 110/160 Max. vent length “a” ft. (m) 98 (30) 110 (33) If used with increasers 100/150,110/160 Model No. -
Page 24: Direct Venting
Exhaust Vent/Air Intake Requirements General requirements Combustion Air Supply The Vitocrossal 300 CU3A boilers must be located in such The Vitocrossal boiler is suitable for sidewall, as well as a way that the vent length is as short as possible and that vertical venting. -
Page 25: General Installation Information
A damaged venting system may Ensure that the exhaust vent/air intake pipes are properly cause unsafe conditions. supported. The Vitocrossal 300 CU3A boiler is not designed to support the weight of the exhaust vent/air intake pipe system. WARNING Field supplied increaser fittings (transition) should ... -
Page 26: Approved Materials For Two-Pipe System
CAUTION CAUTION Do not use cellular (foam) core pipe material to vent On the job site, ensure that non-listed combustion air this Vitocrossal 300 CU3A boiler. pipe materials are not inadvertently used instead of listed vent pipe material. CAUTION Do not use PVC material in exhaust system. -
Page 27: Vent Requirements - Stainless Steel
Exhaust vent/air intake connection to boiler The use of vent material other than listed UL/ULC The vent connection to the Vitocrossal 300 CU3A boiler stainless steel, positive pressure vent pipe and fittings must be made with the starter stainless steel adaptor can cause property damage, severe personal injury (supplied by others and/or parallel adaptor). -
Page 28: Maximum Equivalent Length
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent Requirements - Stainless Steel (continued) Maximum equivalent length - (horizontally or vertically vented) Intake Ø Exhaust Ø Equivalent Boiler model length CU3A 26, 35 3 in. 3 in. 198 ft. (80 mm) (80 mm) (60 m) CU3A 45, 57... -
Page 29: Steel
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Component Parts of the Venting System - Stainless Steel Termination Coupling with Screen Termination Elbow with Screen 90° or 45° Termination Tee with Screen Termination Hood with Screen Exhaust vent termination options (vertical installation) Stainless Steel Slip Vertical Termination Supplier... -
Page 30: Vent Requirements - Cpvc
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent Requirements - CPVC Additional requirements for UL/ULC listed CPVC vent pipe Note: The Vitocrossal 300 CU3A boiler has passed the material zero inches vent clearance to combustibles testing requirements dictated by the Harmonized Standard Use UL/ULC listed special plastic pipe (CPVC) for ANSI Z21.13. -
Page 31: Vent And Air Intake Pipe Starter Adaptors - Cpvc
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent and Air Intake Pipe Starter Adaptors - CPVC To install CPVC flue gas vent with Vitocrossal 300 CU3A boilers the CPVC flue gas adaptor D has to be ordered from Viessmann. -
Page 32: Requirements For Ul/Ulc Listed Rigid Pp(S) Vent Pipe Material
Permits may be required before commencement of the temperature of 230ºF (110ºC)]. installation. For Vitocrossal 300 CU3A 45, 57 (with boiler flue adaptor 110 mm to 100 mm) the vent manufacturers must supply transition adaptors. The air intake termination for side wall air intake installations should be located on a wall that is least affected by prevailing winds. -
Page 33: Vent And Air Intake Pipe Starter Adaptors - Pp(S)
ECCO Mfg 3 in. 4 in. (80 mm) (110 mm) Note: Vitocrossal 300 CU3A flue gas terminations are predesigned for PP(s) vent pipes. See vent manufacturers sizes. Note: When using PP(s) material for combustion air supply, CPVC adaptors are not required. -
Page 34: Side Wall Vent Termination - Stainless Steel
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Side Wall Vent Termination - Stainless Steel, CPVC or PP(s) If less than 10 in. required (see D in IMPORTANT fig. below) min 12 in. (305 mm) The exhaust vent/air intake system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the “Natural Gas and 10 in. -
Page 35: Vent Length Requirements
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent Length Requirements Maximum vent/air intake pipe length - horizontal The total equivalent length specified for a two pipe system IMPORTANT consisting of stainless steel, CPVC or PP(s) is the total combined length of the exhaust vent and air intake pipe Always include vent termination length in calculations. -
Page 36: Maximum Vent/Air Intake Pipe Length - Vertical
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent Length Requirements (continued) Maximum vent/air intake pipe length - vertical Flue Note: For combination of different vent/air intake pipe diameters, such as Ø 4 in. stainless steel vent with Ø 3 in. (PP(s), CVPC, PVC, ABS) air intake pipe, the total equivalent length must be used for the smaller pipe diameter. -
Page 37: Maximum Vent/Air Intake Pipe Length - Horizontal/Vertical (Hybrid System)
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent Length Requirements (continued) Maximum vent/air intake pipe length - horizontal/vertical Flue (hybrid system) All PP(s) vent material and air intake (if PP(s) used) must be ULC S636 or UL1738 listed. The total equivalent length specified for a two pipe system is the total combined length of the exhaust vent and air intake pipe system. -
Page 38: Standard Long Sweep Elbows
(m) ft. (m) Equivalent vent length calculation example Stainless steel 3 (0.91) 2 (0.61) (Vitocrossal 300 CU3A 26/35 systems diameter 3 in.) CPVC, ABS, PVC 5 (1.52) 3 (0.91) plastic pipe Maximum allowable equivalent length is 198 ft. (60 m) PP(s) 1 (0.30) - Page 39 Long sweep elbows are recommended for use with venting system. Equivalent vent length calculation example (Vitocrossal 300 CU3A 26/35 systems diameter 3 in.) Maximum equivalent length - vertical exhaust / horizontal air intake (hybrid) 2 x 90º stainless steel elbow....6 ft. (1.83 m) 2 x 45º...
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Page 40: Flue Vent Termination Requirements
Flue Vent Termination Requirements Multiple boiler installations (vertical flue termination) When terminating the vertical vent pipes of multiple Vitocrossal 300 CU3A boilers, a minimum clearance of 4 inches (100 mm) is required between the outside edges of each vent pipe. -
Page 41: Component Parts Of The Pp(S) Venting System
1 Boiler vent pipe adaptor 2 Air intake adaptor (PVC, CPVC, ABS) 3 PP(s) adaptor (110 mm to 100 mm when using M&G system with Vitocrossal 300 CU3A 45 or 57) 4 90º elbows 5 Combustion air intake straight pipe... -
Page 42: Horizontal Pipe System
1 Boiler vent pipe adaptor 2 Air intake adaptor (PVC, CPVC, ABS) 3 PP(s) adaptor (110 mm to 100 mm when using M&G system with Vitocrossal 300 CU3A 45 or 57) 4 90º elbows 5 Combustion air intake straight pipe... -
Page 43: Single Pipe Venting (Room Air Dependent)
The Vitocrossal 300 CU3A boiler is suitable for sidewall, If boiler is installed in a confined space (a space with a as well as vertical venting using field supplied venting volume of less than 50 cubic feet per 1000 Btu/h of gas material. -
Page 44: General Installation Information
Different manufacturers offer a number of different joint systems and adhesives. Do not mix pipes, fittings Viessmann recommends that the entire vent system be and/or joining methods from different manufacturers. checked by a licensed professional heating contractor at Failure to comply could result in leakage, potentially least once each year following initial installation. -
Page 45: Installation Steps (Outline)
A damaged venting system may IMPORTANT cause unsafe conditions. Ensure that the exhaust vent pipes are properly supported. The Vitocrossal 300 CU3A boiler is not designed to WARNING support the weight of the exhaust vent pipe system. Field supplied increaser fittings (transitions) should The venting system is approved for indoor installations ... -
Page 46: Approved Material For Single Pipe Vent System
Type B vent materials (or materials employed. better) may be used. The Vitocrossal 300 CU3A boiler is not designed to To obtain flashings and storm collars, please contact your support the weight of the venting system. -
Page 47: Additional Requirements For Stainless Steel Vent Pipe Material
In case of discrepancies, contact original parts supplier. Exhaust vent pipe connection to boiler The vent connection to the Vitocrossal 300 CU3A boiler Termination Tee must be made with a starter stainless steel adaptors with Screen (supplied by others). -
Page 48: Vent Requirements - Cpvc
Elbows/Coupling Exhaust vent connection to boiler The vent connection to the Vitocrossal 300 CU3A boiler WARNING must be made with CPVC starter adaptors (see table). The starter adaptors are intended for a slip fit and slide The use of vent material other than materials approved into the boiler adaptor with a gentle twisting motion. -
Page 49: Requirements For Ul/Ulc Listed Rigid Pp(S) Vent Pipe Material
Listed manufacturers deliver PP(s) vents. The venting system must be installed by a licensed For Vitocrossal 300 CU3A (with boiler flue adaptor 110- professional heating contractor familiar with the operation 100) the vent manufacturers developed special transition and maintenance of heating appliances and venting. -
Page 50: Side Wall Vent Termination
Single Pipe Venting (Room Air Dependent) CU3A Venting Systems Installation Side Wall Vent Termination IMPORTANT For PP(s) systems, all exhaust vent and air intake piping and elbows exposed outside, must be UV resistant polypropylene (supplied by the vent manufacturer). IMPORTANT min 12 in. -
Page 51: Vent Length Requirements
Single Pipe Venting (Room Air Dependent) CU3A Venting Systems Installation Vent Length Requirements Maximum vent pipe length - horizontal IMPORTANT All PP(s) vent material (if PP(s) used) must be ULC S636 or UL 1738 listed. First elbow not included in equivalent vent calculation. Always include vent termination length in calculations. -
Page 52: Maximum Vent Pipe Length - Vertical
Single Pipe Venting (Room Air Dependent) CU3A Venting Systems Installation Vent Length Requirements (continued) Maximum vent pipe length - vertical IMPORTANT All PP(s) vent material must be ULC S636 or UL 1738 listed. Size the exhaust vent pipe as specified in the table. For PP(s) systems, all exhaust vent piping and elbows This table lists the maximum allowable vent length in feet exposed outside, must be UV resistant polypropylene... -
Page 53: Component Installation Guide
Legend 1 Flue gasket outlet 2 Vent pipe starter adaptor or PP(s) adaptor (110 mm to 100 mm when using M&G system with Vitocrossal 300 CU3A 45 or 57) 3 Elbow, 90° 4 Straight pipe* 5 Elbow, 45° 6 Suspension band / hanger... -
Page 54: Single-Pipe Vent Starter Adaptor Installation
Single Pipe Venting (Room Air Dependent) CU3A Venting Systems Installation Component Installation Guide (continued) Single-pipe vent starter adaptor installation WARNING Installing single-pipe vent adaptor for stainless steel, CPVC and PP(s) (if required) Prior to installation, ensure the specially designed single-pipe vent adaptor end is smooth and chamfered to prevent possible damage to the sealing gasket of the boiler vent pipe adaptor (coaxial). -
Page 55: Flashing And Storm Collar Installation
Single Pipe Venting (Room Air Dependent) CU3A Venting Systems Installation Vent Termination Location Requirements Vertical installations The vent must be installed observing local regulations in addition to National Codes, CAN/CSA-B149.1 or 2 (for installations in Canada) or ANSI-Z223.1 or NFPA 54 (for installations in the U.S.A.). -
Page 56: Vent Length Requirements
CU3A Venting Systems Installation Vent Length Requirements Equivalent vent length calculation example - vertical (stainless steel system) Vitocrossal 300 CU3A 2 x 90º elbow...........6 ft. (1.8 m) 2 x 45º elbow...........4 ft. (1.2 m) 3 x vent pipe (0.5 m)......4.9 ft. (1.5 m) 2 x vent pipe (1 m).........6.6 ft. -
Page 57: Flue Vent Length Requirements
Flue Vent Termination Requirements Multiple boiler installations (vertical flue termination) When terminating the vertical vent pipes of multiple Vitocrossal 300 CU3A boilers, a minimum clearance of 4 inches (100 mm) is required between the outside edges of each vent pipe. -
Page 58: Installation Of Support System - Pp(S)
Ensure that the venting system is properly supported; the venting system. Please contact Viessmann to order. Vitocrossal 300 CU3A boiler is not designed to support the weight of the venting system. -
Page 59: General Flexible Pipe Installation Information
Use special venting system (UL/ULC listed for Category systems and adhesives. Do not mix pipes, fittings and/ IV) for exhaust vent material of the Vitocrossal 300 CU3A boilers. Contact on of the following suppliers to order or joining methods from different manufacturers. Failure to comply could result in leakage, potentially causing parts. -
Page 60: Exhaust Vent Installation Steps
General Information CU3A Venting Systems Installation General Flexible Pipe Installation Information (continued) Exhaust vent installation steps The length of the flexible vent system can be determined WARNING two ways: use a plumb line to measure the existing chimney length (add an extra 16 in. (40 cm) for each Ensure that the entire venting system is protected from bend). -
Page 61: Recommended Venting Practice
General Information CU3A Venting Systems Installation General Flexible Pipe Installation Information (continued) Exhaust vent installation steps (continued) Recommended venting practice Once the bottom of the flex pipe and adaptor has reached the desired position, insert into the support elbow/support strip assembly. When installing a venting system the following recommended venting practices apply: Keep length and number of 90º... -
Page 62: Combustion Air Supply
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Combustion Air Supply The Vitocrossal 300 CU3A boiler is suitable for vertical Inspect all finished exhaust vent/air intake piping to ensure: venting using rigid pipe and flexible pipe vent system Vent/air intake pipe and fittings are of approved material. -
Page 63: Venting Options (Two-Pipe System)
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Venting Options (Two-pipe System) The two-pipe venting system draws combustion air A through a separate air intake pipe from the outdoors. Flue gases B are discharged to the outdoors via the single-pipe rigid-pipe and flexible vent system. The two-pipe system is flexible in the selection of materials offered by different manufacturers and the location of the air intake termination. -
Page 64: Vent Requirements - Flexible Vent System / Connector Pipes
Viessmann. These parts are available in pre-cut diameters of 3 in. or 4 in. Note: The Vitocrossal 300 CU3A boiler has passed the zero inches vent clearance to combustibles testing requirements dictated by the Harmonized Standard ANSI Z21.13. -
Page 65: Side Wall Air Intake Termination
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Side Wall Air Intake Termination Support Bracket IMPORTANT The air intake system must terminate so that proper Attach clearances are maintained as cited in local codes or the Termination Side Wall latest edition of the “Natural Gas and Propane Installation Elbow w/Screen Code"... -
Page 66: Vent Length Requirements
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent Length Requirements Maximum vertical exhaust vent pipe length and vertical air intake pipe length Legend Maximum allowable equivalent length - vertical a Equivalent length (exhaust) Boiler Model System Ø Max. combined b Equivalent length (air intake) See note below equivalent vent... -
Page 67: Maximum Vertical Exhaust Vent Pipe Length And Horizontal Air Intake Pipe Length
Direct Venting (Two-pipe System) CU3A Venting Systems Installation Vent Length Requirements (continued) Maximum exhaust vent pipe length vertical and air intake pipe length horizontal Legend Maximum allowable equivalent length - vertical exhaust / horizontal air intake (hybrid) a Equivalent length (exhaust) b Equivalent length (air intake) Boiler Model System Ø... -
Page 68: Standard Long Sweep Elbows (For Cpvc / Pvc / Abs Pipes Air Intake Use Only)
D 90º elbow E PP(s) adaptor (110 mm to 100 mm when using Equivalent vent length calculation example M&G system with Vitocrossal 300 CU3A 45 or 57) (Vitocrossal 300 CU3A 26/35 systems diameter 3 in.) F Air intake adaptor G Flex pipe with adaptor set Maximum allowable equivalent length is 149 ft. -
Page 69: Combustion Air Supply
152 mm) opening becomes a 14 in. x 10 in. (356 mm x blower. 254 mm) opening for a grill containing metal louvers. The Vitocrossal 300 CU3A boiler is suitable for vertical venting using flexible venting system material. The CAUTION... -
Page 70: Vent Length Requirements
Single Pipe Venting (Room Air Dependent) CU3A Venting Systems Installation Vent Length Requirements Maximum vertical exhaust vent pipe length Legend Maximum allowable equivalent length - vertical A Combustion air intake Boiler Model System Ø Max. combined B Combustion air opening (room) See note below equivalent vent C Boiler flue termination... -
Page 71: General Component Parts Of The Flex Venting System
A Combustion air intake B Flue gas outlet 1 Boiler vent pipe adaptor (for PP(s) adaptor 110 mm to 100 mm when using M&G system with Vitocrossal 300 CU3A 45 or 57) 2 Pipe support (mounting clip) 3 Adaptors 4 90... - Page 72 CU3A Venting Systems Installation...