Raypak 122-322 manual Barometric Damper, Support of Vent Stack, Vent Terminal Location

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Combustion Air

Exhaust

Venting Category

Certified

Combustion Air

 

Supply

Configuration

Appliance Material

Inlet Material

 

 

 

 

 

 

 

 

Vertical Natural

 

Type B or and

 

 

 

I

Category I Venting

 

 

 

Draft Venting

 

 

From Inside

 

System*

 

 

 

 

 

 

Building (Non-Direct

 

 

 

 

 

Horizontal

 

 

 

 

Venting)

 

Stainless Steel

 

 

 

Thru-wall

III

 

 

 

(Gas Tight)

 

 

 

Venting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type B or and

 

 

 

Vertical Venting

I

Category I Venting

Galvanized Steel

 

From Outside

 

 

System*

 

 

 

PVC

 

Building (Direct

 

 

 

 

 

 

 

 

Horizontal

 

 

ABS

 

Venting)

 

Stainless Steel

 

 

CPVC

 

Thru-wall

III

 

 

 

 

(Gas Tight)

 

 

 

 

 

Venting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*As defined in the latest edition of the NFGC, or in Canada, the B149.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table H: Venting Category Requirements

 

 

 

 

 

 

 

 

Barometric Damper

A barometric damper may be required when vent heights exceed 25 feet or when the draft is greater than -0.08 in. WC. In these installations, a barometric damper (single acting) is recommended.

The damper should be installed NO CLOSER than 18 in. from the discharge of the unit and no closer than 18 in. from a combustible ceiling. The damper can be installed in horizontal or vertical runs of vent pipe as necessary. Installation in a bull-head tee is acceptable as shown in the NFGC.

The weights on the damper should be adjusted per the damper manufacturer’s instructions for proper opera- tion.

Support of Vent Stack

The weight of the vent stack or chimney must not rest on the heater vent connection. Support must be pro- vided in compliance with applicable codes. The vent should also be supported to maintain proper clear- ances from combustible materials.

Use insulated vent pipe spacers where the vent pass- es through combustible roofs and walls.

Vent Terminal Location

NOTE: During winter months check the vent cap and make sure no blockage occurs from build up of snow. Condensate can freeze on the vent cap. Frozen condensate on the vent cap can result in a blocked flue condition.

General

Give special attention to the location of the vent termi- nation to avoid possibility of property damage or personal injury.

a)Gases may form a white vapor plume in winter. The plume could obstruct a window view if the ter- mination is installed in close proximity to windows.

b)Prevailing winds could cause freezing of conden- sate and water/ice build-up on building, plants or roof.

c)The bottom of the vent terminal and the air intake shall be located at least 12 in. above grade.

d)Un-insulated single-wall metal vent pipe shall not be used outdoors on cold climates for venting gas utilization equipment.

e)Through-the-wall vents for Category II and IV appliances and non-categorized condensing appli- ances shall not terminate over public walkways or

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Contents Installation & Operating Instructions Page Contents Are important but not related to personal injury hazards Product Receipt Before InstallationInstallations at Elevation Model IdentificationComponent Locations Component Locations-BackModel Quantity Vent Size Burners Gas Valves Blowers Flue General InformationModel Burners per Valve Stages Fire at Stage Time/Temperature Relationships in Scalds General SafetyWater Time to Produce Serious Temp Burn Indoor Installations InstallationInstallation Codes Equipment BaseOutdoor Installations Heater Min. Clearance Recommended From CombustibleConventional Combustion Air Supply InstallationsCombustion and Ventilation Air Indoor UnitsGeneral Canadian InstallationsWater Piping Relief Valve PipingHydronic Heating Dual Boiler-Primary/Secondary Piping Air-Separation/Expansion Tank Domestic Hot Water PipingPiping-Heating Boilers Three-Way ValvesSingle Heater-Domestic Hot Water with One Storage Tank Automatic Chlorinators and Chemical Feeders Pool HeatingGas Supply Winterizing Your HeaterGas Supply Connection Gas Supply Pressure Gas Pressure RegulatorSurge Protection Electrical Power ConnectionsCheck the Power Source Making the Electrical ConnectionsElectrical Connections-Domestic Hot Water Single Stage and 2-Stage TankstatVenting Definition of Appliance CategoriesSupport of Vent Stack Barometric DamperVent Terminal Location Table I Vent/Air Inlet Termination Clearances US Installations Canada InstallationsVenting Installation Tips Venting ConfigurationsNatural Draft Vertical Venting System Installation Natural Draft Vertical Vent TerminationModel Appliance Certified Vent Size Max. Venting Category Inches Length feetHorizontal Thru-wall Direct Vent Termination Category Inches Length Certified Max Combustion Air Inlet Max. AirVenting Air Intake FeetHorizontal Thru-wall Direct Vent Termination Category Inches Min./Max Combustion Max. Air CertifiedVenting Height InchesVertical Direct Vent System Installation Outdoor InstallationVertical Direct Vent Termination Controls High Limit Manual ResetIgnition Control Module Flow Switch Low Water Cut Off OptionalWiring DIAGRAM-MODELS PRE-START-UP Initial START-UPSafety Inspection Main Burner AdjustmentStart-Up Follow-Up Post START-UP CheckOperation Operating InstructionsTo Turn Off Gas To Appliance MaintenanceSuggested Minimum Maintenance Schedule Yearly Beginning of each heating seasonMonthly AppendixInside Combustion Air Contamination QuarterlyCorporate Headquarters Page
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122-322 specifications

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