Desa FA-60BA Fresh AIR for Combustion Ventilation, Determining FRESH-AIR Flow for Heater Location

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OWNER’S MANUAL

FRESH AIR FOR

COMBUSTION AND

VENTILATION

Continued

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

Determining if You Have a Confined or Unconfined Space

Use this worksheet 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 openings, add the volume of these rooms to the total volume of the space.

2.Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.

__________ (volume of space) ÷ 50 cu. ft. = (Maximum Btu/Hr the space can support)

Example: 2560 cu. ft. (volume of space) ÷ 50 cu. ft. = 51.2 or 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

Example:

 

 

 

Gas furnace

 

______________ Btu/Hr

 

 

 

 

Gas water heater

 

44,000

Btu/Hr

Vented gas heater

 

______________ Btu/Hr

 

 

Vent-free heater

+

10,000

Btu/Hr

Gas fireplace logs

 

______________ Btu/Hr

 

 

=

 

 

 

Total

54,000

Btu/Hr

Other gas appliances* +

______________ Btu/Hr

 

 

 

 

Total

=

______________ Btu/Hr

 

 

 

 

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

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) 54,000 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 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 adjoin- ing 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 Outdoors, 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 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, ANS Z223.1, Section 5.3 or applicable local codes.

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Contents What to do if YOU Smell GAS OWNER’S Operation and Installation ManualFAS-10BB Natural GAS Heater Safety InformationProduct Identification Product FeaturesLocal Codes UnpackingProviding Adequate Ventilation Fresh AIR for Combustion and VentilationUnusually Tight Construction Confined and Unconfined SpaceDetermining if You Have a Confined or Unconfined Space Fresh AIR for Combustion VentilationDetermining FRESH-AIR Flow for Heater Location Ventilation Air From Outdoors Ventilation AIRVentilation Air From Inside Building Installation Removing Front Panel Of Heater Installing Bottom Mounting ScrewsMethods For Attaching Mounting Bracket To Wall Marking Screw LocationsInstalling Bottom Mounting Screw Connecting to GAS SupplyChecking GAS Connections Pressure Testing Gas Supply Piping SystemPressure Testing Heater Gas Connections Operating Heater Manual Lighting ProcedureLighting Instructions To Turn OFF GAS To ApplianceThermostat Control Operation For Your Safety Read Before LightingInspecting Burner Cleaning and MaintenanceObserved Problem Possible Cause Remedy TroubleshootingMaintenance, Gas leak. See Warning statement at Technical Service SpecificationsService Hints Service PublicationsReplacement Parts AccessoryParts Under Warranty Parts not Under WarrantyBaltimore Electric Washer Equipment Co Dayton Hardware Parts CentralsTarantin Tank Co Heater & Fireplace Store Cans Unlimited, IncFA-10BA Illustrated Parts ListODS Pilot Assembly KEY FA-10BA Description QTY FA-60BA KEY FA-60BA Description QTY FAS-10BB KEY FAS-10BA Description QTY Warranty Information