Desa VSGF36PTB, VSGF36NTB, VSGF36NRB, VSGF36PRB Determining FRESH-AIR Flow for Heater Location

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AIR FOR COMBUSTION

AND VENTILATION

Continued

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 door- less 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 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

+_

39,000

Btu/Hr

Total

=_

79,000

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)

79,000 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 9.

B.Vent room directly to the outdoors. See Ventila- tion Air From Outdoors, page 9.

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 maxi- mum Btu/Hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation.

WARNING:Iftheareainwhich the heater may be operated 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.



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119305-01A

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Contents What to do if YOU Smell GAS VSGF36NTB, VSGF36PTB, VSGF36NRB and VSGF36PRBTable of Contents Safety InformationSafety Information Local Codes Unpacking Product FeaturesProduct Identification Planning Product SpecificationsLocating Firebox Air For Combustion Ventilation Providing Adequate VentilationUnusually Tight Construction Confined and Unconfined SpaceDetermining FRESH-AIR Flow for Heater Location Determining if You Have a Confined or Unconfined SpaceInstallation Ventilation AIRVentilation Air From Inside Building Ventilation Air From OutdoorsInstallation Clearances Minimum Wall and Ceiling Clearances seeBuilt-In Firebox Installation Mantel Clearances for Built-In InstallationRough Opening Dimensions for Built-in Installation Front Width DepthInstalling Gas Piping to Fireplace Location Installing Firebox UsingOptional Accessory Mantels Propane/LP Installation Items NeededNatural Gas Connecting Fireplace to Gas Supply Checking Gas Connections,Pressure Testing Fireplace Gas Connections Checking GAS ConnectionsKPa Test Pressures Equal To or Less Than Psig 3.5 kPaInstalling Logs Middle Right Log Middle Left LogHard-wiring Firebox Installing Fireplace Hood and ScreenFor Your Safety Read Before Lighting Operating FireplaceThermostat Models Lighting InstructionsManual Lighting Procedure Remote Control ModelsThermostat Control Operation To Turn OFF GASSet flame adjustment knob to any level between HI and LO Blower Operation To Turn OFF GAS To ApplianceOptional Hand-Held Remote OperationOn/Off Series Model HRC100 Thermostat Series Model hrc200Key Pad Lock Feature Inspecting BurnersPilot Flame Pattern Main burnerCleaning Maintenance Burner Injector Holder Pilot Air Inlet HoleWiring Diagram Replacement Parts SpecificationsTechnical Service Service HintsTroubleshooting Observed Problem Possible Cause RemedyMaintenance, See Cleaning and Mainte Shut off gas supply Do not try to light any appliance Accessories Illustrated Parts Breakdown Models VSGF36PTB, VSGF36NTBParts List Models VSGF36PRB, VSGF36NRB Parts List Models VSGF36PTB, VSGF36NTB, VSGF36PRB and VSGF36NRB KEY NO. Part no Description 119305-01A 119305-01A Limited Warranty VENT-FREE GAS Fireplace System Warranty InformationKeep this Warranty