Lennox International Inc Gas-Fired Hot Water Boiler, GWB9-075IH-2 Boiler Size, Installation

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COMBUSTION AIR AND VENT PIPE

Table 5 - Combustion Air And Vent Piping Lengths - Total Equivalent Length

BOILER

SIZE

100

75 & 50

2” PIPE MINIMUM

2” PIPE MAXIMUM

3” PIPE MINIMUM

3” PIPE MAXIMUM

VENTING

VENTING

VENTING

VENTING

2 FEET

21 FEET

15 FEET

92 FEET

2 FEET

26 FEET

20 FEET

112 FEET

 

 

 

 

•Under certain conditions, flue gas will condense, forming moisture, and may be corrosive. Take steps to prevent building materials at vent from being damaged by exhaust of flue gas.

•Vent shall not terminate where it may cause hazardous frost or ice accumulations on adjacent property surfaces.

9.Venting system shall terminate at least 3 ft. (0.9m) above any forced air inlet (except boiler’s combustion air inlet) within 10 ft.(3m).

•Venting system shall terminate at least 12 in. from any air opening into any building.

•Vent bottom shall be located at least 12 in. above grade.

•Termination of the vent shall be not less than 7 ft. (2.1m) above adjacent public walkway or paved driveway.

•Vent terminal shall not be installed closer than 3 ft. from inside corner of L shaped structure.

•Vent termination should be kept at least 3 ft. away from vegetation.

•USA only. Venting system shall terminate at least 4 ft. horizontally from, and in no case above or below, unless 4 ft. (1.22m) horizontal distance is maintained, from electric meters, gas meters, regulators, and relief equipment.

•Canada only. Venting system shall terminate at least 6 ft. (1.83m) horizontally from, in no case above or below, unless a 6 ft. (1.83m) horizontal distance is maintained, from electric meters, gas meters, regulators, and relief equipment.

•Vent shall not terminate within 6 ft. (1.8m) of mechanical air-supply inlet to any building.

•Vent shall not terminate above regulator within 3 ft. (900 mm) horizontally of vertical center line of regulator vent outlet to maximum vertical distance of 15 ft. (9.5m).

•Vent shall not terminate within 3 ft. (900mm) of window or door that can be opened in any building, or any non-mechanical air-supply inlet to any building, or of combustion air inlet of any other appliance.

•Vent shall not terminate underneath veranda, porch or deck unless,

(a)veranda, porch or deck is fully open on minimum of two sides beneath floor, and

(b)distance between top of vent termination and underside of veranda, porch or deck is greater than 1 ft. (300mm).

See figures 12 and 13 and 14 for two pipe terminations. See figures 15, 16 and 17 for concentric vent terminations.

Installation

1.Attach combustion air intake piping using field supplied 2” flexible coupling. Attach vent piping to furnished 2” vent pipe connector on draft inducer outlet.

2.All pipe joints are to be water tight

3.Working from boiler to outside, cut pipe to required length(s).

4.Deburr inside and outside of pipe.

5.Chamfer outside edge of pipe for better distribution of primer and cement.

6.Clean and dry all surfaces to be joined.

7.Check dry fit of pipe and mark insertion depth on pipe.

8.After pipes have been cut and pre-assembled, apply cement primer to pipe fitting socket and end of pipe to insertion mark. Quickly apply approved cement to end of pipe and fitting socket (over primer). Apply cement in light, uniform coat on inside of socket to prevent buildup of excess cement. Apply second coat.

9.While cement is still wet, insert pipe into socket with ¼ turn twist. Be sure pipe is fully inserted into fitting socket.

10.Wipe excess cement from joint. Continuous bead of cement will be visible around perimeter of properly made joint.

11.Handle pipe joint carefully until cement sets.

12.Support combustion air and vent piping minimum of every 5 feet using pre-formed metal hanging straps. Do not rigidly support pipes. Allow movement due to expansion and contraction.

13.Slope horizontal portion of combustion air and vent pipes toward boiler minimum of ¼” per linear ft. (21mm/m) with no sags between hangers.

14.Use appropriate methods to seal openings where vent and combustion air pipes pass through roof or side wall.

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Contents Installation Instructions Boiler Dimensions Introduction IntroductionGeneral Important Safety InformationNet Ahri Rating Shipping Flue Diameter SEA Level Ratings Natural and Propane Gases90 50/75/100 Series 2 Natural GAS Boilers for USE AT High Altitude United States Installations43331093 43331096 90 50/75 Series 2 Propane GASBoiler Location Considerations Before Installing the BoilerBoiler Sizing Extreme cold climate areas, use ¾ Armaflex or equivalent Boiler InstallationLocating The Boiler Combustion Air And Vent Pipe RequirementsFoundation Requirements Install boiler on level surfaceBoiler is not to be installed on carpeting Condensate Drain RequirementsSupply And Return Lines Clean the System FirstNear Boiler Piping Single Zone Boiler Piping Two Zone Boiler Piping With Zone Valves Multi-Zone SystemsTwo Zone Boiler Piping With Circulators Page Page Page Terminate pipe with plain end not threaded Safety Relief ValveExpansion Tank And Make-Up Water Diaphragm Type Expansion Tank Piping Conventional Closed Type Expansion Tank Piping Chilled Water Piping Reinstall vent drain lineCondensate Drain Piping Filling Condensate Trap With WaterElbow @ 3 ft. + 1 elbow @ 3 ft. = 6 equivalent ft. of pipe Combustion AIR and Vent PipeConnections And Termination ExampleBoiler Size InstallationRoof Vent / Intake Terminations Vent AIR IntakeLess Than 12 Clearance CombustionVent Air Concentric Vent TerminationsFeet minimum total equivalent length for all models Combustion Air and Vent Piping Boiler ConnectionsLeak Check Gas Piping Connecting The Gas PipingGAS Supply Piping Check Gas Supply365,000 Gas Pipe Sizes625,000 445,000Connect Circulator Pump Wiring Electrical WiringElectric Power Supply Thermostat InstallationWiring Schematic Ladder Wiring Diagram Page Ladder Diagram for Figure Controls and Accessories Circulator Pump Casting Temperature Safety SwitchDrain Valve Draft InducerStart UP To Turn Off Gas To Appliance Operating InstructionsDisplay S9381A Integrated Boiler Control Operation and AdjustmentsUser Parameters Adjusting Settings State Code Definitions Sequence of Operation Check OUT Procedure and Adjustment Review All Instructions Set Thermostat To Desired Room TemperatureVR8205 Maintenance and Cleaning Remove draft inducer and gasket from top of flue connector Annual Examination And Cleaning Of Boiler ComponentsIgniter wires Gas valve wires Initial Service Checks TroubleshootingError Codes Boiler Differential Pressure Differential AIR Pressure Switch CheckAluminum Series Eliminate System Leaks Clean System FirstFill Water and Chemistry General Guidelines When Using Antifreeze Antifreeze Products Boiler Model Serial # Date Installed Measured BTU/HR input Installation and CHECK-OUT CertificatePage Lennox Industries Inc. Dallas, Texas
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GWB9-050IH-2, GWB9-100IH-2, GWB9-075IH-2, Gas-Fired Hot Water Boiler specifications

Lennox International Inc. is a prominent player in the HVAC industry, renowned for its innovative solutions and high-efficiency products. Among its standout offerings is the GWB8 Gas-Fired Hot Water Boiler, available in various models including GWB8-262E-2, GWB8-245E-2, GWB8-280E-2, and GWB8-299E-2. These units are designed to provide reliable and efficient heating solutions for residential applications.

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