Watts Aerco Modulex EXT Series Technical Application Manual
Venting & combustion air guide
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Modulex EXT Vent and Combustion Air Application Guide
Venting & Combustion Air Guide
Modulating Condensing Hot Water Boilers
Latest Update: 09/25/2017
TAG-0054-0F
GF-136-V
TECHNICAL APPLICATION GUIDE
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
APPLIES TO THE FOLLOWING
LIGHT COMMERCIAL MODELS
• MLX EXT 321
• MLX EXT 450 / MLX EXT 481
• MLX EXT 600 / MLX EXT 641
• MLX EXT 800 / MLX EXT 802
• MLX EXT 962
• MLX EXT 1100 / MLX EXT 1123
COMMERCIAL MODELS
• MLX EXT 1500 / MLX EXT 1530
• MLX EXT 1912
• MLX EXT 2295 / MLX EXT 2300
• MLX EXT 2600 / MLX EXT 2677
• MLX EXT 3000 / MLX EXT 3060
GF-136-V
Page 1 of 28
09/25/2017
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Table of Contents
Related Manuals for Watts Aerco Modulex EXT Series
Summary of Contents for Watts Aerco Modulex EXT Series
- Page 1 GF-136-V Modulex EXT Vent and Combustion Air Application Guide TECHNICAL APPLICATION GUIDE Venting & Combustion Air Guide Modulating Condensing Hot Water Boilers APPLIES TO THE FOLLOWING LIGHT COMMERCIAL MODELS • MLX EXT 321 • MLX EXT 450 / MLX EXT 481 •...
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Page 2: Table Of Contents
Modulex EXT Vent and Combustion Air Application Guide TABLE OF CONTENTS: CHAPTER 1: CODES, SAFETY, AND VENTING SYSTEMS ..........3 1.1. APPLICABLE FEDERAL CODES ................3 1.2. GAS VENT CATAGORIES ..................4 1.3. CERTIFIED VENTING MATERIALS FOR FLUE PIPE SYSTEMS ......4 1.3.1. -
Page 3: Chapter 1: Codes, Safety, And Venting Systems
Modulex EXT Vent and Combustion Air Application Guide CHAPTER 1: CODES, SAFETY, AND VENTING SYSTEMS 1.1. APPLICABLE FEDERAL CODES United States: NFPA 54/ANSI National Fuel Gas Code Z223.1: NFPA/ANSI 211: Chimneys, Fireplaces, Vents and Solid Fuel Burning Appliances Canada: CAN1-B149.1: Installation Codes for Gas-Burning Equipment B149.2: Installation Codes for Gas-Burning Equipment... -
Page 4: Gas Vent Catagories
Modulex EXT Vent and Combustion Air Application Guide 1.2. GAS VENT CATAGORIES WARNING! The Modulex boiler is approved for a Category IV vent configuration as well as for sealed combustion installations. Make provisions for combustion and ventilation air in accordance with Section 5.3, (Air for Combustion and Ventilation) of the National Fuel Gas Code - ANSI Z223.1, or Sections 7.2, 7.3, or 7.4 of CAN/CGA B149, Installation Codes, or applicable provisions of the local building codes. -
Page 5: Option 1: Al29-4C Stainless Steel
Modulex EXT Vent and Combustion Air Application Guide 1.3.1. OPTION 1: AL29-4C Stainless Steel • Security Chimneys International, Secure Seal, SS, SSD, and SSID (available through AERCO) • Flex-L International Inc., StaR 34 Vent • Heat-Fab Inc., Saf-T Vent • Protech System Inc., Fas N Seal Vent •... -
Page 6: Factory Supplied Inlet And Vent Components
Modulex EXT Vent and Combustion Air Application Guide 1.4. FACTORY SUPPLIED INLET AND VENT COMPONENTS For installation flexibility, venting connectors are provided for left hand, right hand, and rear connections. Basic drawings of the connection components and optional assemblies are shown in Figures 1 through 4. -
Page 7: Flue Exhaust Piping Starter Pieces
Modulex EXT Vent and Combustion Air Application Guide 1.4.3. Flue Exhaust Piping Starter Pieces Table 1 lists the exhaust vent adaptors available for each Modulex EXT model. Instructions for assembling the vent adaptors are in Chapter 3. TABLE 1: EXT Vent Adaptors BOILER MODELS DIAMETER MATERIAL... -
Page 8: Air Intake Connector (Supplied)
Modulex EXT Vent and Combustion Air Application Guide 1.4.4. Air Intake Connector (Supplied) Air is drawn into the EXT through the air inlet on the left side of the unit (Figure 4). A connector is included installed and ready to use for connecting the appropriate air intake piping for EXT 321– 1123/450–1100. -
Page 9: Chapter 2: Combustion Air System
Modulex EXT Vent and Combustion Air Application Guide CHAPTER 2: COMBUSTION AIR SYSTEM WARNING! Air openings to combustion area must not be obstructed. Using Table 2, air openings may be specified so that adequate combustion air can be maintained. 2.1. COMBUSTION AIR REQUIREMENTS WARNING! •... - Page 10 Modulex EXT Vent and Combustion Air Application Guide 3. When combustion air is brought from outside the building and the boiler room is provided with two permanent openings, one shall commence 12 inches from the top and the other shall commence within 12 inches from the bottom of the room (see Figure 5).
- Page 11 Modulex EXT Vent and Combustion Air Application Guide 7. When terminating the combustion air through the roof: a) Combustion air inlet must be 3 ft. below any vent outlet within 10 ft. See Figures 6 and 7. b) Combustion air inlet must also face away from the vent outlet. See Figure 6. Figure 6: Combustion Air Roof Termination Locations 8.
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Page 12: Combustion Air Pipe Sizing
Modulex EXT Vent and Combustion Air Application Guide Bird Screen Installed Figure 8: Outdoor Installation Air Inlet and Vent Outlet Locations 11. For outdoor installations, an outdoor venting kit is available through AERCO. Please contact your local representative for further details. 2.2. -
Page 13: Common Combustion Air Pipe Sizing
Modulex EXT Vent and Combustion Air Application Guide EXAMPLES: 1. A 40 foot length of combustion air pipe and 1 sharp 90° elbow plus two termination 90° elbows add up to 40 ft. + 10 ft. + (2 x 10 ft.) = 70 equivalent ft. (21.3 m). 2. - Page 14 Modulex EXT Vent and Combustion Air Application Guide EXAMPLES: The combustion air system of two EXT 1123/1100 (2 x 1,123,000 BTU/hr. = 2,246,000 BTU/hr.) consists of 30 foot length of common combustion air pipe and 3 sharp 90° elbows. The termination includes two (2) 90°...
- Page 15 Modulex EXT Vent and Combustion Air Application Guide Figure 10: Typical Common Combustion Air Inlet installation Through Wall TAG-0054_0F AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 15 of 28 GF-136–V Phone: 800-526-0288 09/25/2017...
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Page 16: Chapter 3: Vent System
Modulex EXT Vent and Combustion Air Application Guide CHAPTER 3: VENT SYSTEM Correct boiler venting is crucial for proper operation. Being a condensing boiler, combustion gases are discharged at a very low temperature. It is therefore necessary for the venting system to be impermeable to combustion products and condensate and to be made of corrosion resistant materials. - Page 17 Modulex EXT Vent and Combustion Air Application Guide EUROPEAN FLUE EXHAUST MANIFOLD (SUPPLIED) FLUE ADAPTOR GASKET (SUPPLIED) NUTS (6) (SUPPLIED) Figure 11: Connection of Exhaust Manifold to Flue Exhaust Outlet (EXT 321 – 1123) EUROPEAN FLUE EXHAUST MANIFOLD (SUPPLIED) FLUE ADAPTOR GASKET (SUPPLIED)
- Page 18 Modulex EXT Vent and Combustion Air Application Guide GASKET FOR FLUE ADAPTOR EUROPEAN-TO-USA FLUE EXHAUST ADAPTER (SUPPLIED) EUROPEAN FLUE EXHAUST MANIFOLD INSPECTION PORT Figure 13: Assembly of USA Adaptor to European Flue Manifold (EXT 321 – 1123) GASKET FOR FLUE ADAPTOR EUROPEAN-TO-USA FLUE EXHAUST...
- Page 19 Modulex EXT Vent and Combustion Air Application Guide OPTIONAL FLUE PIPING STARTER PIECE WORM-DRIVEN HOSE-CLAMP BOLT (4) WASHER (4) ADAPTOR CONNECTOR (4” or 6”, PVC or SS) GASKET EUROPEAN-TO-USA FLUE ADAPTER EUROPEAN EXHAUST MANIFOLD Figure 15: Flue Piping Starter Piece Assembly (EXT 321 – 1123) TAG-0054_0F AERCO International, Inc.
- Page 20 Modulex EXT Vent and Combustion Air Application Guide FLUE PIPING STARTER PIECE WORM-DRIVEN HOSE CLAMP SCREWS (8 EACH) WASHERS (8 EACH) DIAMETER REDUCTION ADAPTOR CONNECTOR GASKET EUROPEAN-TO-USA FLUE ADAPTER EUROPEAN EXHAUST MANIFOLD Figure 16: Flue Piping Starter Piece Assembly (EXT 1500 –3060) Page 20 of 28 AERCO International, Inc.
- Page 21 Modulex EXT Vent and Combustion Air Application Guide FLUE VENT PIPE INSTALLED WITH RTV LIQUID SILICONE AND WORM-DRIVEN HOSE CLAMP FLUE STARTER PIECE FLUE MANIFOLD EUROPEAN-TO-USA FLUE ADAPTER (EXT 321 – 1123) Figure 17: Installed Flue Piping Starter Piece FLUE VENT PIPE INSTALLED WITH RTV LIQUID SILICONE AND WORM-DRIVEN...
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Page 22: Installation Procedure For Venting System Through Walls
Modulex EXT Vent and Combustion Air Application Guide NOTE: Specific installation regulations for side-wall and vertical terminations, respectively, are described in the following two sections (Sections 3.2 and 3.3). 3.2. INSTALLATION PROCEDURE FOR VENTING SYSTEM THROUGH WALLS The minimum distances from adjacent public walkways, adjacent buildings, operable windows and building openings shall not be less that those values specified in the National Fuel Gas Code, ANSI Z223.1 and/or CAN/CGA B149, Installation Codes. - Page 23 Modulex EXT Vent and Combustion Air Application Guide Figure 19: Determining Location of Vent Outlet TAG-0054_0F AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 23 of 28 GF-136–V Phone: 800-526-0288 09/25/2017...
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Page 24: Installation Procedure For Vertical Venting
Modulex EXT Vent and Combustion Air Application Guide 3.3. INSTALLATION PROCEDURE FOR VERTICAL VENTING WARNING! Do not insulate or otherwise wrap vent pipe or fittings. Follow the vent pipe manufacturer’s installation instructions for vertical venting. WARNING! Non-motorized louvers and grilles must be fixed in an open position. Minimum screens mesh size shall not be smaller than ¼... -
Page 25: Vent Piping Size
Modulex EXT Vent and Combustion Air Application Guide 3.4. VENT PIPING SIZE The maximum length is the combined length of straight horizontal and vertical runs, and the equivalent straight length of fittings. The required lengths for each boiler are as shown on Table 5 and TABLE 5: Venting Pipe Run Lengths EQUIVALENT VENT LENGTH EXAMPLES MAXIMUM... -
Page 26: Common Vent Piping Size
Modulex EXT Vent and Combustion Air Application Guide 3.5. COMMON VENT PIPING SIZE Refer to Figures 6, 7 and 8 in Section 2 for typical common vent installations. The maximum length is the sum of the equivalent straight length of horizontal runs, vertical runs, and fittings of the individual vent connector and the common vent pipe. - Page 27 Modulex EXT Vent and Combustion Air Application Guide The maximum pressure drop of the combustion air piping is also 100 equivalent feet (30.5 m). See Section 2.3. Note that this does NOT mean that the allowed combined pressure drop between the vent and combustion air is 200 equivalent feet (61 m).
- Page 28 Modulex EXT Vent and Combustion Air Application Guide Change Log: DATE DESCRIPTION CHANGED BY Rev E: 02/22/2017 Curtis Harvey DIR 17-008: Added new model numbers for units with aluminum water connections. Reformatted per new design standard. Rev F: 09/25/2017 Chris Blair DIR 17-066: Modify Table 1, Specify P/N for PolyPro vents (section 1.4.3) ©...