Desa GWP20T GWN30T, WMP20, GN30 AIR for Combustion and Ventilation, Providing Adequate Ventilation

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AIR FOR COMBUSTION AND VENTILATION

Providing Adequate Ventilation

AIR FOR COMBUSTION AND VENTILATION

WARNING: This heater shall not be installed in a confined space or unusually tight construction un- less provisions are provided for adequate combustion and ventilation air. Read the following instructions to insure proper fresh air for this and other fuel-burning appliances in your home.

Today’s homes are built more energy efficient than ever. New materials, increased insulation, and new construction methods help reduce heat loss in homes. Home owners weather strip and caulk around windows and doors to keep the cold air out and the warm air in. During heating months, home owners want their homes as airtight as possible.

While it is good to make your home energy efficient, your home needs to breathe. Fresh air must enter your home. All fuel-burning appliances need fresh air for proper combustion and ventilation.

Exhaust fans, fireplaces, clothes dryers, and fuel burning appliances draw air from the house to operate. You must provide adequate fresh air for these appliances. This will insure proper venting of vented fuel-burning appliances.

PROVIDING ADEQUATE VENTILATION

The following are excerpts from National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation.

All spaces in homes fall into one of the three following ventilation classifications:

1.Unusually Tight Construction

2.Unconfined Space

3.Confined Space

The information on pages 4 through 6 will help you classify your space and provide adequate ventilation.

Unusually Tight Construction

The air that leaks around doors and windows may provide enough fresh air for combustion and ventilation. However, in buildings of unusually tight construction, you must provide additional fresh air.

Unusually tight construction is defined as construction where:

a.walls and ceilings exposed to the outside atmosphere have a continuous water vapor retarder with a rating of one perm (6x10-11kg per pa-sec-m2) or less with openings gasketed or sealed and

b.weather stripping has been added on openable win- dows and doors and

c.caulking or sealants are applied to areas such as joints around window and door frames, between sole plates and floors, between wall-ceiling joints, between wall panels, at penetrations for plumbing, electrical, and gas lines, and at other openings.

If your home meets all of the three criteria above, you must provide additional fresh air. See Ventilation Air From Outdoors, page 6.

If your home does not meet all of the three criteria above, proceed to Determining Fresh-Air Flow For Heater Loca- tion, page 5.

Confined and Unconfined Space

The National Fuel Gas Code, ANSI Z223.1/NFPA 54 defines a confined space as a space whose volume is less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space and an unconfined space as a space whose volume is not less than 50 cubic feet per 1,000 Btu per hour (4.8 m3 per kw) of the aggregate input rating of all appliances installed in that space. Rooms communicating directly with the space in which the appliances are installed*, through openings not furnished with doors, are considered a part of the unconfined space.

*Adjoining rooms are communicating only if there are doorless passageways or ventilation grills between them.

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Contents GWN20T, GWP20T GWN30T, GWP30T What to do if YOU Smell GASTable of Contents Safety InformationSafety Information Product Identification Product FeaturesLocal Codes UnpackingAIR for Combustion and Ventilation Providing Adequate VentilationUnusually Tight Construction Confined and Unconfined SpaceDetermining FRESH-AIR Flow for Heater Location Determining if You Have a Confined or Unconfined SpaceVentilation Air From Inside Building Ventilation AIRVentilation Air From Outdoors Installation Installation ItemsCheck GAS Type Locating HeaterInstalling Heater to Wall Attaching Thermostat Sensing BulbMounting Bracket Removing Front Panel Of HeaterAttaching Mounting Bracket To Wall Marking Screw LocationsPlacing Heater On Mounting Bracket Installing Bottom Mounting Screws Mounting Base Feet to Floor Where required by local codeMounting Heater to Floor with Optional Floor KIT Mounting Base Feet to HeaterConnecting to GAS Supply Typical Inlet Pipe DiametersPressure Testing Heater Gas Connections Pressure Testing Gas Supply Piping SystemChecking GAS Connections Operating Heater Manual Control Models For Your Safety Read Before LightingLighting Instructions Manual Lighting Procedure To Turn OFF GAS to ApplianceShutting Off Heater Shutting Off Burner Only pilot stays litPilot Flame Pattern Inspecting HeaterThermostat Control Operation Cleaning Maintenance Cleaning Burner Pilot AIR InletBurner Flame Pattern CabinetTroubleshooting Observed Problem Possible CauseObserved Problem Possible Cause Remedy Gas leak. See Warning statement at Illustrated Parts Breakdown Parts List WMN20 WMP20 Description QTYGWN30T, GWP30T GGN30T, GP30T GWN20T, GWP20T, GWN30T, GWP30T Specifications Replacement PartsService Hints Technical ServiceOwners Registration Form Postage Required Accessories Parts CentralsEquipment Shutoff Valve GA5010 FAN Kits GA3250TWarranty Information