Desa CLD3018NA 24, CLD3924PTA, CLD3924NTA Determining FRESH-AIR Flow for Heater Location

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AIR FOR COMBUSTION AND VENTILATION

Providing Adequate Ventilation (Cont.) Determining Fresh-Air Flow For Heater Location

5

AIR FOR COMBUSTION AND VENTILATION

Continued

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

Confined Space 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.

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Confined or Unconfined Space

Use this work sheet to determine if you have a confined or unconfined space.

Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways or ventilation grills between the rooms.

1.Determine the volume of the space (length x width x height). Length x Width x Height = ___________ cu. ft. (volume of space)

Example: Space size 20 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2560 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or open- ings, add the volume of these rooms to the total volume of the space.

2.Multiply the space volume by 20 to determine the maximum Btu/Hr the space can support.

__________ (volume of space) x 20 = (Maximum Btu/Hr the space

can support)

Example: 2560 cu. ft. (volume of space) x 20 = 51,200 (maximum Btu/Hr the space can support)

3.Add the Btu/Hr of all fuel burning appliances in the space.

Vent-free heater

 

_____________ Btu/Hr

Gas water heater*

 

_____________ Btu/Hr

Gas furnace

 

_____________ Btu/Hr

Vented gas heater

 

_____________ Btu/Hr

Gas fireplace logs

 

_____________ Btu/Hr

Other gas appliances* +

_____________ Btu/Hr

Total

=

_____________ Btu/Hr

*Do not include direct-vent gas appliances. Direct-vent draws com- bustion air from the outdoors and vents to the outdoors.

Example:

 

 

Gas water heater

 

40,000

 

_____________ Btu/Hr

Vent-free heater

+

31,500

_____________ Btu/Hr

Total

=

71,500

_____________ Btu/Hr

4.Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.

__________________ Btu/Hr (maximum the space can support)

__________________ Btu/Hr (actual amount of Btu/Hr used)

Example: 51,200 Btu/Hr (maximum the space can support) 71,500 Btu/Hr (actual amount of Btu/Hr used)

The space in the above example is a confined space because the actual Btu/Hr used is more than the maximum Btu/Hr the space can support. You must provide additional fresh air. Your options are as follows:

A.Rework worksheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 6.

B.Vent room directly to the outdoors. See Ventilation Air From Out- doors, page 6.

C.Install a lower Btu/Hr heater, if lower Btu/Hr size makes room unconfined.

If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

WARNING: If the area in which the heater may be operated is smaller than that defined as an uncon- fined space or if the building is of unusually tight construction, provide adequate combustion and ven- tilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 Sec- tion 5.3 or applicable local codes.

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Contents CLD3924PTA, CLD3924NTA OWNER’S Operation and Installation ManualWhat to do if YOU Smell GAS Winchester Oak Model ShownSafety Information Table of ContentsProduct Identification Local Codes Product FeaturesUnpacking AIR for Combustion and VentilationDetermining if You Have a Confined or Unconfined Space Determining FRESH-AIR Flow for Heater LocationConfined Space and Unconfined Space Ventilation AIR InstallationVentilation Air From Inside Building Ventilation Air From OutdoorsMinimum Firebox Size Check GAS TypeMinimum Fireplace Clearance to Combustible Materials Minimum Noncombustible Material Clearances If Not Using MantelMantel Clearances Determining Minimum Mantel Clearance when Using a HoodFloor Clearances Determining Minimum Mantel ClearanceInstalling Heater Base Assembly Installing Damper Clamp Accessory for Vented OperationInstallation Items Needed Area of Various Standard Round FluesAttaching Flexible Gas Hose to Heater Gas Regulator Connecting to GAS SupplyChecking GAS Connections Pressure Testing Gas Supply Piping SystemEquipment Shutoff Valve Pressure Testing Heater Gas ConnectionsFit over the burner see . Make sure the front What to do if YOU Smell GAS Operating HeaterVariable Control Operation Lighting InstructionsTo Turn OFF GAS to Appliance Manual Lighting ProcedureShutting Off Heater Shutting Off Burners Only pilot stays litThermostat Control Operation Inspecting Burners Cleaning MaintenanceReplacement Parts Technical ServiceService Hints Observed Problem Possible Cause Remedy TroubleshootingMaintenance, Gas leak. See Warning statement at For Masonry and Factory-built Metal Fireplace Optional Positioning of Thermostat Sensing BulbModel CGS2718P CLD3018PA CGS3124P CLD3924PTA SpecificationsIllustrated Parts Breakdown Variable Manually-Controlled Winchester Oak Models Parts ListCLD3018NA CLD3018PA KEY Part Number CLD3018NA CLD3018PA Description QTY CLD3924NTA CLD3924PTA KEY Part Number CLD3924NTA CLD3924PTA Description QTY Parts Central AccessoriesOwners Registration Form Postage Required 107068 Warranty Information

CLD3018NA 24, CLD3924NTA, CLD3924PTA specifications

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