Desa GS38 Determining FRESH-AIR Flow for Heater Location, Confined and Unconfined Space

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Air For Combustion

and Ventilation

Continued

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.

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 fireplace plus any adjoining rooms with doorless pas- sageways 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 22 ft. (length) x 18 ft. (width) x 8 ft. (ceiling height) = 3168 cu. ft. (volume of space)

If additional ventilation to adjoining room is supplied with grills or openings, 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 = (Maxi- mum Btu/Hr the space can support)

Example: 3168 cu. ft. (volume of space) x 20 = 63,360 (maximum Btu/Hr the space can support)

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

Vent-free fireplace

____________ 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. Di- rect-vent draws combustion air from the outdoors and vents to the outdoors.

Example:

40,000

Gas water heater

__________ Btu/Hr

Vent-free fireplace

33,000

+__________ Btu/Hr

Total

73,000

=__________ 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: 63,360 Btu/Hr (maximum the space

can support)

73,000 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 maxi- mum 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 adjoin- ing 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 8.

B.Vent room directly to the outdoors. See Ventila- tion Air From Outdoors, page 8.

C.Install a lower Btu/Hr fireplace, 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 un- confined space. You will need no additional fresh air ventilation.

WARNING: If the area in which the fireplace may be oper- ated is smaller than that defined as an unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA54 Section 5.3 or applicable local codes.

113195-01C

www.desatech.com



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Contents VI33NRB and VI33PRB Shown with GS38 Surround Kit G8010 Brick Liner AccessoriesRemote Ready GAS Fireplace Insert Safety Information Table of ContentsSafety Information Safety Information Product Identification Remote Control AccessoriesLocal Codes UnpackingAir For Combustion Ventilation Product FeaturesProviding Adequate Ventilation Confined and Unconfined Space Determining FRESH-AIR Flow for Heater LocationDetermining if You Have a Confined or Unconfined Space Ventilation Air From Outdoors InstallationVentilation AIR Ventilation Air From Inside BuildingElectrical Hookup Installing Surround Kit GS38 or GS43Blower Accessory Check GAS TypeRemoving Screws and Screen Installation Clearances Installing HoodMaterial, Side Wall and Ceiling Installation Items Needed Installing Gas Piping to Fireplace LocationPropane/LP Connecting Fireplace Insert to GAS SupplyNatural Checking Gas Connections Checking GAS ConnectionsPressure Testing Fireplace Insert Gas Connections Fireplace Insert Installation into masonry fireplaceTest Pressures Equal To or Less Than Psig 3.5 kPa Assembling and attaching trim Connecting Fireplace Insert to Gas Supply,Installing Log Set Installing LogsInstalling Remote Receiver Unit Installing 9-Volt BatteriesInstalling 9-Volt Battery Not Included Receiver Operating Fireplace Insert For your safety Read before lightingLighting Instructions Remote Operation Manual Lighting ProcedureTo Turn OFF GAS To Appliance Optional Hand-HeldOn/Off Series Model HC100 Manual ModeAuto Thermostatic Mode Safety FeaturesOptional Blower Operation Auto Shutoff FeatureKey Pad Lock Feature Inspecting BurnersMain burner Cleaning MaintenanceBurner Flame Pattern Burner Primary AIR HolesLogs Wiring DiagramsObserved Problem Possible Cause Remedy TroubleshootingMaintenance, See Cleaning and Mainte Statement above Gas leak. See WarningService Hints SpecificationsReplacement Parts Technical ServiceModels VI33NRB and VI33PRB Illustrated Parts BreakdownParts List Fireplace Insert Models VI33NRB and VI33PRB Parts List WALL-MOUNT ON/OFF Switch Receiver and HAND-HELD Remote Control KIT HRC100 SeriesEquipment Shutoff Valve GA5010 113195-01C Keep this Warranty Warranty InformationLimited Warranty VENT-FREE GAS Fireplace Insert

GS38 specifications

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