Smith Cast Iron Boilers GB100W Vent Connections, Combustion Air Duct Sizing, Common Vent Systems

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Page 6

GB100W NATURAL OR PROPANE BOILER

 

INSTALLATION AND OPERATING INSTRUCTIONS

To operate properly and safely this boiler requires a continuous supply of air for combustion. Oxygen is used by the burners in the boiler to burn the gas. In addition, air is also used to assist in the safe disposal of the products of combustion. This air is known as dilution air and mixes with the products of combustion to assist in it’s exit through the flue pipe and chimney. An adequate supply of outside air must be available to replace that used by these processes.

Older houses often have enough “leakage” to provide an adequate amount of combustion air provided that the demand for combustion air is not too great. Homes that are relatively new or “tight” will most likely require the installation of a fresh air duct or other means of providing air for combustion. Any home utilizing other gas burning appliances, a fireplace, wood stove or any type of exhaust fan must be checked for adequate combustion air when all of these devices are in operation at one time. Sizing of an outside air duct must be done to meet the requirements of all such devices.

Table 2: Combustion Air Duct Sizing

 

Input Btuh

Input Btuh

Input Btuh

Fresh Air

1/4" Wire

Metal

Wooden

Duct Size

Mesh Screen

Louvers

Louvers

3" x 12"

144,000

108,000

36,000

 

 

 

 

8" x 8"

256,000

192,000

64,000

 

 

 

 

8" x 12"

384,000

288,000

96,000

 

 

 

 

8-1/2" x 16"

512,000

384,000

128,000

 

 

 

 

If the boiler will be located in an alcove, closet or any confined space refer to item 6 in the Boiler Location section of this manual.

CHIMNEY & VENT PIPE CONNECTIONS

WARNING: This boiler must be vented in accordance with Part 7, Venting of Equipment, of the latest revision of the National Fuel Gas code, ANSI Z223.1/NFPA 54 and all applicable local building codes. Improper venting of this appliance can result in excessive levels of carbon monoxide which can result in severe personal injury or death!

Chimney Inspection & Sizing

If this boiler will be connected to a masonry chimney, a thorough inspection of the chimney must be performed. Ensure that the chimney is clean, properly constructed and properly sized. Table 1 lists the flue size and chimney height required for this boiler.

When more than one appliance is connected to the same chimney flue, the flue must be large enough to handle both appliances.

The vent installation must be in accordance with Part 7 of the latest revision of the National Fuel Gas Code, ANSI Z223.1/NFPA 54.

WARNING : If an appliance using any type of a mechanical draft system operating under positive pressure is connected to a chimney flue, never connect any other appliances to this flue. Doing so can result in the accumulation of carbon monoxide which can cause severe personal injury or death!

VENT CONNECTIONS

Always use a type B or C vent pipe of the proper diameter for the boiler. Use the shortest, straightest vent system possible for the particular application. The vent system should be sloped up toward the chimney at a rate of 1/4 in/ft, 2 mm/m. Ensure that the flue pipe is properly supported and each connection securely fastened with at least 3 corrosion resistant sheet metal screws. The termination of the vent pipe should be flush with the inside of the chimney flue.

Always provide a minimum clearance of 6 in, 152 mm, between type C vent pipe and any combustible materials. Type B1 vent may be used, clearance between it and any combustible material must be as listed.

WARNING: Failure to maintain minimum clearances between vent connectors and any combustible material can result in extensive property damage, severe personal injury or death!

WARNING: Never modify or alter any part of the draft hood or vent damper supplied with this boiler. This includes the removal or alteration of any baffles in the draft hood or flue collar. Never install a vent pipe of a diameter different than that of the boiler draft hood flue collar, table 1. Failure to comply with this warning can result in severe personal injury or death.

Common Vent Systems

If an existing appliance is removed from a common venting system, the common venting system may then be too large for the proper venting of the remaining appliances connected to it. At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.

Au moment du retrait d'une chaudière existante, les mesures suivantes doivent être prises pour chaque appareil toujours raccordé au système d'évacuation commun et qui fonctionne alors que d'autres appareils toujours raccordés au système d'évacuation ne fonction- nent pas: système d'évacuation.

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Contents GB100W Contents Before YOU StartBoiler Ratings and Capacities Boiler LocationClearances to Combustible Construction FrontVent and Chimney Dimensions Combustible Floor OptionCombustion AIR Chimney Inspection & Sizing Vent ConnectionsCombustion Air Duct Sizing Common Vent SystemsVent Dampers Heating System Piping Heating System PipingCirculators Piping For Use With Cooling UnitsSystem Bypass Pumped BlendReverse Acting Aquastats Equivalent Length ChartGAS Supply Piping Gas Pipe CapacityThermostat Installation Electrical WiringElectrical Power Connections Vent DamperTheoriginalwire Bereplacedwith Ifanyof Itmust Fenwal/Honeywell Direct IgnitionWiththisappliancemust Thermoplasticwireorits Bereplaced EquivalentHoneywell Continuous Pilot Ignition Multi Zone Diagram Boiler SET UP Flame Roll-out Safety Shutoff SystemFor Your Safety Read Before Operating Lighting InstructionsWhat to do if YOU Smell GAS Comment Couper Ladmission DE GAZ DE Lappareil Pour Votre Sécurité Lisez Avant DallumerInstructions Dallumage QUE Paire SI Vous Sentez UNE Odeur DE GAZOperating Instructions To Turn OFF GAS to AppliancePour Votre Sécurité Lisez Avant DE Mettre EN Marche QUE Faire SI Vous Sentez UNE Odeur DE GAZBoiler Operation Continuous Pilot SystemIntermittent & Direct Ignition Systems Gas Pressure Adjustment Boiler Checking & AdjustmentPilot Adjustment Input RateBoiler Maintenance Instructions to the Installer Vent SystemControls Replacement Parts GB100 Series Repair PartsSpark Ignition Honeywell Canadian Supplement Limited Lifetime Warranty For Residential Water Boilers Shortness of breath Page North ELM Street WESTFIELD, MA 01085 TEL 562-9631 FAX 413