Desa 102783-01B installation manual AIR for, Ventilation, Determining AIR Flow for Heater Location

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AIR FOR

DETERMINING AIR FLOW FOR HEATER LOCATION

COMBUSTION

Determining if You Have a Confined or Unconfined Space

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

AND

Space: Includes the room in which you will install heater plus any adjoining rooms with

VENTILATION

doorless passageways or ventilation grills between the rooms.

 

 

 

 

 

Continued

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

 

 

Gas furnace

 

 

___________________ Btu/Hr

 

 

Vented gas heater

 

 

___________________ Btu/Hr

 

 

Gas fireplace logs

 

 

___________________ Btu/Hr

 

 

Other gas appliances*

+ ___________________ Btu/Hr

 

 

Total

 

= ___________________ Btu/Hr

 

Example:

Gas water heater

 

 

40,000

 

Btu/Hr

 

 

Vent-free heater

 

+

31,500

 

Btu/Hr

 

 

 

 

=

 

 

 

 

 

Total

 

71,500

 

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)

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 8.

B.Vent room directly to the outdoors. See Ventilation Air From Outdoors, page 8.

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.

Continued

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102783

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Contents What to do if YOU Smell GAS OWNER’S Operation and Installation Manual24 Variable Manually-Controlled Models Contents Safety Information With this heater Flame-MaxStandard Split Combo Local Codes UnpackingPiezo Ignition System Product Features AIR for Combustion and VentilationSafety Device OperationConfined Space Providing Adequate VentilationUnusually Tight Construction Unconfined SpaceDetermining if You Have a Confined or Unconfined Space AIR forVentilation Determining AIR Flow for Heater LocationVentilation Air From Inside Building Ventilation AIRVentilation Air From Outdoors Flue damper closed InstallingVented configuration. Check your state or local codes Check GAS TypeLOG Sizing Requirements Minimum Fireplace Clearance To Combustible MaterialsMinimum Wall and Ceiling Clearances see Figure Minimum Non Combustible Material Clearances If Using Mantel Installing Attaching Damper Clamp Installing Damper Clamp Accessory for Vented OperationInstallation Items Needed InstallingInstallation Items Needed Connecting to GAS SupplyExternal Regulator With Vent Pointing Down Checking GAS Connections Pressure Testing Gas Supply Piping SystemManual Shutoff Valve Pressure Testing Heater Gas ConnectionsAdd lava rock around base of heater Installing LogsHeater Operating Heater Pilot Flame Pattern Inspecting BurnersLogs Cleaning and Maintenance Trouble ShootingTurn off heater and let cool before cleaning ODS/PILOT and BurnerSee Cleaning Cleaning and Mainte Trouble ShootingStatement at top TROUBLE- ShootingService Hints Technical ServiceVariable Manually Controlled Parts AccessoriesIllustrated Parts Breakdown Parts Available not Shown Parts ListKeep this Warranty Warranty Information

102783-01B specifications

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