HORIZONTAL COMBUSTION AIR INLET KITS
Contents
1. Non Condensing Condensing Negative Vent Pressure Positive ill IV Vent Pressure Category I Includes non condensing appliances with negative vent pressure like the traditional atmospheric unit heater Category Il Groups condensing appliances with negative vent pressure Category IlI Appliances are non condensing and operate with a positive vent pressure Category IV Covers condensing appliances with positive vent pressure NOTICE Category Il and IV do not apply to equipment specified within this manual Vent SystemsTermination Clearance Requirements Minimum Clearances for Structure Object Termination Locations USA CANADA Ait below 1 ft 0 3m for 100 000 BTUH Door window or gravity vent inlet or ee input or less 3 ft 0 9m for are 4 ft horizontally combustion air inlet for other appliances input exceeding 100 000 1 ft above BTUH Forced air inlet within 10 ft 3 ft above 6 ft 1 8m Adjoining building or parapet 10 ft 10 ft 3 04m Adjacent public walkways 7 ft above grade 7 ft 2 1m above grade Electric gas meters amp regulators 1 ft Above grade level 4 ft horizontal 3 ft 0 9m horizontally from meter regulator assembly 6 ft 1 8m any direction from a gas service regulator vent outlet 1 ft 0 3m 4 Minimum above maximum snow depth or per local code whichever is greatest INSTALLATION HORIZONTAL TERMINA2. Canada use corrosion resistant and gas tight listed vent pipe conforming with local building codes or in the absence of local building codes with current CSA B149 1 Installation Codes for Natural Gas Burning Appliances and Equipment or CSA B149 2 Installation Codes for Propane Gas Burning Appliances and Equipment For residential installations in the United States vent pipe approved for Category III appliances must be used between the appliance and the combustion air inlet box Any run of single wall vent pipe passing through an unheated space must be insulated with insulation suitable to 550 F 6 The vent system must be installed to prevent collection of condensate Pitch horizontal pipes downward 1 4 inch per foot 21mm per meter toward the vent cap to facilitate drainage The equivalent length of the vent system must not be less than 5 feet 1 5m and must not exceed 50 feet 15 2m The equivalent length equals the total length of straight pipe plus 10 feet 3 05m for each 90 elbow and 4 feet 1 22m for each 45 elbow Each joint must be secured with at least three corrosion resistant screws Two full turns of 3M 425 Aluminum Foil tape or its equivalent must then be used to seal each joint High temperature silicone sealant may be used instead of the tape Silicone sealant must be used to seal the joint between the double wall vent pipe and the single wall pipe For horizontal vent systems longer than 5 feet 1 5
3. of the building Turn on clothes dryers and any exhaust fans such as range hoods and bathroom exhausts so they shall operate at maximum speed Do not operate a summer exhaust fan Close fireplace damper 4 Follow the lighting instructions Place the appliance being inspected in operation Adjust thermostat so that the appliance will operate continuously 5 After it has been determined that each appliance connected to the venting system properly vents when tested as outline above return doors windows exhaust fans fireplace dampers and any other gas burning appliance to their previous condition of use 6 If improper venting is observed during any of the above tests the venting system must be corrected immediately so that the system conforms with the National Fuel Gas Code ANSI Z223 1 NFPA 54 When resizing any portion of the venting system the venting system should be resized to approach the minimum size as determined using the appropriate tables in Appendix G of the National Fuel Gas Code ANSI Z223 1 NFPA 54 The unit heater shall be connected to a factory built chimney or vent complying with a recognized standard or a masonry or concrete chimney lined with a lining material acceptable to the authority having jurisdiction Venting into an unlined masonry chimney is prohibited ADDITIONAL REQUIREMENTS FOR CANADIAN INSTALLATIONS The following instructions apply to Canadian installations in addition to installation a
4. 3M 425 Aluminum Foil Tape or its equivalent must then be used to seal each joint General Electric RTV 108 Dow Corning RTV 732 or an equivalent silicone sealant with a temperature rating of 500 F may be used instead of the tape 9 Forhorizontal combustion air systems longer than 5 feet 1 5m the system must be supported from overhead building structures at 4 foot 1 2m intervals in the U S and at 3 foot 0 91m intervals in Canada INSTALLATION continued EXHAUST VENTING AWARNING Never operate unit heaters without combustion air and flue gas piping in place or severe personal injury or death may occur 1 Vent system installation must be in accordance with the current National Fuel Gas Code NFPA 54 or ANSI 2223 1 National Fuel Gas Code In Canada installation must be in accordance with CSA B149 1 Installation Code for Natural Gas Burning Appliances and Equipment and CSA B149 2 Installation Code for Propane Burning Appliances and Equipment A factory supplied Combustion Air Inlet Kit which includes a combustion air inlet box air inlet screen deflector disk vent terminal and inlet air collar MUST be installed at the termination point of the combustion air vent system See Figures 1a 1b 2a 2b and 4 Each unit heater MUST have its own vent system It MUST NOT be connected to other vent systems or to a chimney Use UL 1738 listed single wall pipe for the vent system For installations in
5. Connect flue pipe and combustion air pipe from combustion air inlet box to unit following Combustion Air and Exhaust Venting instructions on pages 7 and 8 Joint between UL 1738 listed vent pipe and single wall vent pipe must be sealed with high temperature silicone sealant see Figure 4 Collars on unit and on combustion air inlet box are sized so that crimped ends of combustion air pipes go toward the unit and crimped ends of flue pipes go away from the unit INSTALLATION continued Figure 4 Horizontal Combustion Air Inlet Kit Installation Note Separated Combustion Blower Type Unit Shown Inlet Air Screen Wind Deflector Disk Approved Breidert Type L or Fields StarKap Vent Terminal 12 305mm Min Above Grade Plus Max Snow Depth or Per Local Code Whichever is Greater 4 min gt 101 6mm F UL 1738 Listed Vet x One Piece Field Supplied Condensate Drain with Trap i Wall Air Inlet If Required by a aca local authorites 6 min to 1st Joint E 152 4 mm k 4FT 304 8mm l ha gt Flue Pipe Inlet Air Pipe D m 9 1 2 Min 241mm 2 1 2 63 5mm Seal All Joints Secure with a minimum of 3 corrosion resistant screws 1 4 Min 21mm m Min Slope t Wall Combustion Air Inlet Box D9017C I
6. HCAK IOM 3 INSTALLATION AND SERVICE MANUAL J30 09025 HORIZONTAL COMBUSTION AIR INLET KITS CATEGORY III VENTING FOR SEPARATED COMBUSTION TUBULAR GAS FIRED UNIT HEATERS USE 5 INCH KIT FOR UNITS WITH CAPACITIES 100 000 TO 250 000 BTU HR USE 6 INCH KIT FOR UNITS WITH CAPACITIES 300 000 TO 400 000 BTU HR Supplement to unit installation instructions STPIM or STBII A WARNING Improper installation adjustment alteration service or maintenance can cause property damage injury or Si death Read this supplement and the unit heater installation operating and maintenance instructions thoroughly before C US installing or servicing this equipment LISTED Intertek This Combustion Air Inlet Kit utilizes one 5 or 6 inch termination in which both the discharge flue gas and the combustion air inlet pass The location of the vent terminal must be in accordance with the National Fuel Code ANSI Z223 1 NFPA 54 in the U S or the Natural Gas Installation Code CSA B149 1 or the Propane Gas Installation Cade CSA B149 2 in Canada Minimum clearances are shown in Table 1 and Figure 3 KIT CONTENTS Figure 1a 5 Inch Combustion Air Inlet Kit Figure 1b 6 Inch Combustion Air Inlet Kit Part No 11J37R02222 002 1 Flue Vent Terminal 2 Part No 11507R08560 Part No 11J37R02222 003 1 Flue Vent Terminal 2 Part No 11507R08951 1 Combustion Air Inlet Box Assembly see Figure 2a f
7. NSTALLATION continued COMBUSTION AIR VENTING A WARNING Never operate unit heaters without combustion air and flue gas piping in place or severe personal injury or death may occur A WARNING CARBON MONOXIDE Your venting system must not be blocked by any snow snow drifts or any foreign matter Inspect your venting system to ensure adequate ventilation exists at all times Failure to heed these warnings could result in Carbon Monoxide Poisoning symp toms include grogginess lethargy inappropriate tiredness or flu like symptoms 1 The combustion air system installation must be in accordance with the current edition of the National Fuel Gas Code NFPA 54 or ANSI 2223 1 National Fuel Gas Code In Canada installation must be in accordance with CSA B149 1 Installation Code for Natural Gas Burning Appliances and Equipment and CSA B149 2 Installation Code for Propane Burning Appliances and Equipment 2 The combustion air inlet box inlet air screen deflector disk and vent terminal provided with the unit heater must be installed at the termination point of the combustion air vent system See Figures 1a 1b 2a 2b and 4 3 Each unit heater MUST have its own combustion air system It MUST NOT be connected to other air intake systems 4 Use UL 1738 listed single wall pipe for the vent system For installations in Canada use corrosion resistant and gas tight listed vent pipe conforming with
8. TION 5 INCH KIT FOR USE WITH 100 250 MBH UNITS ONLY Select a location on outside wall for vent terminal In most applications the terminal should be on level with the flue outlet of the unit less a 1 4 inch per foot 21mm m pitch for condensate drainage toward the outside of the building See Table 1 and Figures 3 and 4 Cut hole through wall for 8 inch 203mm combustion air pipe Install thimble if required by local codes or type of wall construction Combustion air inlet box may be fastened directly to wall or spaced away from wall using suitable brackets field supplied Cut length of 8 inch UL 1738 listed pipe so that it will protrude 4 inches 102mm through the wall when the box is mounted in position Fasten pipe to box with sheet metal screws using at least 3 screws per joint Seal joint with high temperature silicone sealant 4 WARNING Never use pipe other than 5 inch diameter Never use PVC ABS or any other non metallic pipe for venting To do so may result in serious damage to the unit and or severe personal injury or death Insert pipe through wall and fasten adaptor box in place so that the pipe pitches downward 1 4 inch per foot 21mm m toward the outside Flash and or caulk 8 inch pipe on outside wall Install inlet air screen assembly and fasten to 8 inch pipe with screws Insert a continuous length of 5 inch UL 1738 listed vent pipe through the 5 3 4 inch opening with the UP arrow pointin
9. e ANSI Z223 1 NFPA 54 or applicable provisions of local building codes Refer to notes below for Canadian installations A WARNING CARBON MONOXIDE Your venting system must not be blocked by any snow snow drifts or any foreign matter Inspect your venting system to ensure adequate ventilation exists at all times Failure to heed these warnings could result in Carbon Monoxide Poisoning symptoms include grogginess lethargy inappropriate tiredness or flu like symptoms When an existing heater is removed or replaced in venting system the venting system may not be properly sized to vent the attached appliances An improperly sized vent system can cause formulation of condensate or leakage or spillage of flue gases The following steps shall be followed with each appliance connected to the venting system placed in operation while any other appliances connected to the venting system are not in operation 1 Seal any unused openings in the venting system Inspect the venting system for proper size and horizontal pitch as required in the National Fuel Gas Code ANSI 2223 1 NFPA 54 and these instructions Determine that there is no blockage or restriction leakage corrosion and other deficiencies which could cause an unsafe condition 3 In so far as practical close all building doors and windows and all doors between the space in which the appliance s connected to the venting system are located and other spaces
10. g toward the outside Position the pipe to extend a minimum of 12 inches 305mm beyond the inlet air screen Seal the space between the UL 1738 listed vent pipe and 5 3 4 inch opening of the combustion air inlet box using high temperature silicone sealant Install deflector disk on UL 1738 listed vent pipe 2 1 2 inches 63 5mm from inlet air screen and fasten with screws Install vent terminal on end of UL 1738 listed vent pipe fasten with screws and seal joint see Figure 4 Connect flue pipe and combustion air pipe from combustion air inlet box to unit following Combustion Air and Exhaust Venting instructions on pages 7 and 8 Joint between UL 1738 listed vent pipe and single wall vent pipe must be sealed with high temperature silicone sealant see Figure 4 Collars on unit and on combustion air inlet box are sized so that crimped ends of combustion air pipes go toward the unit and crimped ends of flue pipes go away from the unit HORIZONTAL TERMINATION 6 INCH KIT FOR USE WITH 300 400 MBH UNITS ONLY Select a location on outside wall for vent terminal In most applications the terminal should be on level with the flue outlet of the unit less a 1 4 inch per foot 21mm m pitch for condensate drainage toward the outside of the building See Table 1 and Figures 3 and 4 Cut hole through wall for 10 inch 254mm combustion air pipe Install thimble if required by local codes or type of wall construction Combustion air inlet bo
11. local building codes or in the absence of local building codes with current CSA B149 1 Installation Codes for Natural Gas Burning Appliances and Equipment or CSA B149 2 Installation Codes for Propane Gas Burning Appliances and Equipment For residential installations in the United States vent pipe approved for Category III appliances must be used between the appliance and the combustion air inlet box AWARNING Never use pipe other than 5 or 6 inch diameter with respective Combustion Air Inlet Kits Never use PVC ABS or any other nonmetallic pipe for venting To do so may result in serious damage to the unit and or severe personal injury or death 5 Long runs of single wall combustion air piping passing through an unheated space may require insulating if condensation becomes noticeable 6 The combustion air system must be installed to prevent collection of condensate Pitch horizontal pipes downward 1 4 inch per foot 21 mm m toward the inlet cap to facilitate drainage 7 The equivalent length of the combustion air system must not be less than 5 feet 1 5m and must not exceed 50 feet 15 2m Equivalent length equals the total length of straight pipe plus 10 feet 3 05m for each 90 elbow and 4 feet 1 22m for each 45 elbow NOTICE For optimum performance keep the com bustion air system as straight as possible 8 Each joint must be secured with at least three corrosion resistant screws Two full turns of
12. m the system must be supported from overhead building structures at 4 foot 1 2m intervals in the U S and at 3 foot 0 91m intervals in Canada 10 The exhaust vent system must remain at a minimum distance of 1 inch 25mm from all combustible materials Any part of the vent system that passes through a combustible material must be properly insulated NOTICE Increasing the clearance distances may be necessary if there is a possibility of distortion or discoloration of adjacent materials
13. nd operating instructions 1 Installation must conform with local building codes or in the absence of local codes with current CSA B149 1 Installation Codes for Natural Gas Burning Appliances and Equipment or CSA B149 2 Installation Codes for Propane Gas Burning Appliances and Equipment 2 Any reference to U S standards or codes in these instructions are to be ignored and the applicable Canadian standards or codes applied VENTING GENERAL GUIDELINES continued Do not damper or add heat recovery devices to the flue piping Failure to open such a damper prior to operating the gas unit heater will result in the spillage of flue gas into the occupied space Avoid installing units in areas under negative pressure When required a flue vent fan should be installed in accordance with the instructions included with the fan Vent connectors serving Category and Category II heaters shall not be connected into any portion of mechanical draft systems operating under positive vent pressure Maintain 1 inch 25 4mm clearance between the vent pipe and combustible materials Figure 3 Side View Horizontal Vent No Building Uverhang 3 0 Min 0 9M Min rr aa Building 10 0 Min 3 04M Min Approved Breidert Type L or Fields StarKap Vent Terminal D9333 Table 1 ANSI now organizes vented appliances into four categories Venting Categories
14. or dimensional data 3 Part No 11J37R08572 1 Air Inlet Screen 4 Part No 11507R08569 1 Deflector Disk Also Included 1 Part No J30 09025 Installation Instructions 1 Part No 11HO3R03612 002 Tube of High Temp Silicone Sealant 08 13 SS y gt 1 Combustion Air Inlet Box gt Assembly see Figure 2b o for dimensional data 3 Part No 11J37R08957 1 Air Inlet Screen 4 Part No 11507R09012 1 Deflector Disk Also Included 1 Part No J30 09025 Installation Instructions 1 Part No 11H03R03612 002 Tube of High Temp Silicone Sealant D9014B MESTEK INC E NORTH ELM ST WESTFIELD MA 01085 TEL 413 568 9571 FAX 413 562 8437 www mestek com DIMENSIONAL DATA Figure 2a 5 Inch Combustion Air Inlet Box Assembly 5 75 a 146 1mm 203 2mm op 18 p 381mm Es 2 Q Q o 5 o o o i Lor 127mm 304 8mm 127mm D9015B Figure 2b 6 Inch Combustion Air Inlet Box Assembly 1 0 6 75 254mm 171 45mm o o 17 125 435mm 6 152 4mm m 14 125 358 8mm 181mm D9016B VENTING GENERAL GUIDELINES All unit heaters must be vented All Venting installations shall be in accordance with the latest edition of Part 7 Venting of Equipment of the National Fuel Gas Cod
15. x may be fastened directly to wall or spaced away from wall using suitable brackets field supplied Cut length of 10 inch UL 1738 listed pipe so that it will protrude 4 inches 102mm through the wall when the box is mounted in position Fasten pipe to box with sheet metal screws using at least 3 screws per joint Seal joint with high temperature silicone sealant A WARNING Never use pipe other than 6 inch diameter Never use PVC ABS or any other non metallic pipe for venting To do so may result in serious damage to the unit and or severe personal injury or death Insert pipe through wall and fasten adaptor box in place so that the pipe pitches downward 1 4 inch per foot 21 mm m toward the outside Flash and or caulk 10 inch pipe on outside wall Install inlet air screen assembly and fasten to 10 inch pipe with screws Insert a continuous length of 6 inch UL 1738 listed vent pipe through the 6 3 4 inch opening with the UP arrow pointing toward the outside Position the pipe to extend a minimum of 12 inches 305mm beyond the inlet air screen Seal the space between the UL 1738 listed vent pipe and 6 3 4 inch opening of the combustion air inlet box using high temperature silicone sealant Install deflector disk on UL 1738 listed vent pipe 2 1 2 inches 63 5mm from inlet air screen and fasten with screws Install vent terminal on end of UL 1738 listed vent pipe fasten with screws and seal joint see Figure 4
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