Weil-McLain 80 manual Connect breeching and venting systems, Select type of venting system

Page 31

• Installation • Start-Up • Maintenance • Parts

13 Connect breeching and venting systems

General venting information

Construct metal breeching:

• Model 80 boilers operate with positive overfire pressure. Adjust

• See Table 14 or Table 15 for minimum breeching diameter.

damper assembly (see page 33) during burner start-up to achieve

• Select material type and thickness in compliance with local codes.

0.1" W.C. positive pressure at damper sample hole.

 

 

 

 

Conventional flue pipe should not be used as it could

 

 

 

 

 

 

 

Select type of venting system

 

 

 

 

leak flue gases and carbon monoxide emissions

 

 

 

 

 

 

 

through seams and joints, resulting in severe

 

 

 

 

 

 

 

Forced draft

 

 

 

 

 

 

personal injury or death.

Boiler, breeching and stub vent operate at positive pressure. Entire

• Refer to ASHRAE Guide for chimney and breeching calculations

system must be gas-tight to prevent leaks. Stub vent height must be

and construction and lining.

limited to prevent negative draft with 3-foot minimum stub vent

 

 

 

 

Long horizontal breechings, excessive number of

 

 

 

 

height above roof. See Figures 31 and 32.

 

 

 

 

 

 

 

 

tees and elbows or other obstructions restricting

 

 

 

Balanced draft

 

 

 

 

 

 

combustion gas flow can result in possibility of

Boiler operates with positive pressure overfire. Chimney may provide

 

 

 

 

condensation,flue gas leakage and carbon monoxide

 

 

 

 

emissions, causing severe personal injury or death.

excess draft which may require a barometric draft control installed

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and set to provide minimum draft to maintain 0.1" positive pressure

 

 

 

 

 

 

 

 

 

 

at flue collar. Minimum chimney height above roof is 3 feet. See

 

 

 

 

 

 

 

 

 

 

Figures 33 and 34.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 14 Minimum breeching diameter —

 

 

 

 

 

 

 

 

 

 

 

 

 

forced draft venting

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 31

 

Figure 32

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Stub vent – forced draft — single boiler

Stub vent – forced draft — multiple boilers

Figure 33

Conventional chimney – balanced draft with barometric draft control when required — single boiler

Part No. 550-141-935/0602

Figure 34

Conventional chimney – balanced draft with barometric draft control when required — multiple boilers

Table 15 Minimum breeching diameter — balanced draft venting

31

Image 31
Contents Boiler Manual Contents Lay a foundation, if needed Before installing boilerInstallation must comply with Before selecting boiler locationProvide combustion and ventilation air openings For packaged boiler For block assemblyUsing crane attach free end of cables to eye of crane Set boiler in placePlace a block under pipe to hold section upright Install back refractory blanketAssemble block Prepare back sectionIf using tankless heater TI sections Install intermediate sectionsPrepare remaining sections Prepare boiler and test Perform hydrostatic pressure testInstall burner mounting plate on front section Complete block assemblyInstall cleanout plates Prepare flue collector hood assembly Install flue collectorFlue collector assembly Install collector hold-down boltsInstall flue collector Top flue boilers only Before installing flue collectorAfter installing flue collector, ALL Boilers Rear flue boilers onlyInstall flue collector Connect water boiler piping Install pipingGeneral water piping information Size secondary boiler pump GPM based on following formulas Piping for multiple boilers see FigureGeneral steam piping information Connect steam boiler pipingConnect steam boiler piping Condensate piping to boiler Condensate receiver capacity Multiple Steam Boiler Piping Gravity Condensate Return Install jacket front and rear panels Install jacketBefore installing jacket Install support brackets and railsInstall jacket Install jacket top panels Install jacket side panelsInstall jacket trim Jacket side panel placement Models 380, 480, 580 Jacket side panel placement Models 780, 880 Jacket side panel placement Models 1080, 1180, Jacket top panel placement To pipe tankless heaters Pipe tankless heatersSize piping no smaller than heater inlet and outlet Install controls Install water boiler controlsInstall controls where shown in and Figure Install steam boiler controlsWater level control locations see Table General venting information Construct metal breeching Connect breeching and venting systemsSelect type of venting system Wiring and fuel piping Install burnerMake final adjustments Check boiler for gas-tight seal Freeze protection when usedDimensions and ratings Dimensions and ratings Parts Parts Eye Irrigate immediately Breathing Fresh air Handling ceramic fiber and fiberglass materialsPropane boilers propane gas odorant All Residential & Commercial Cast Iron Boilers
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