Desa VN1000B installation manual Determining FRESH-AIR Flow for Heater Location

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FRESH AIR FOR COMBUSTION AND VENTILATION

Continued

6

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 18 ft. (length) x 16 ft. (width) x 8 ft. (ceiling height) = 2304 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: 2304 cu. ft. (volume of space) ÷ 50 cu. ft. = 46.1 or 46,100 (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

+

10,000

BTU/Hr

Total

=

 

 

BTU/Hr

50,000

*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: 46,100

BTU/Hr (maximum the space can support)

50,000

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 adjoining room or add ventilation grills between rooms. See Ventilation Air From Inside Building, page 7.

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.

WARNING

WARNING ICON

G 001

You must provide additional ventilation air in a confined space.

099400

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Contents OWNER’S Operation and Installation Manual What to do if YOU Smell GASContents Safety Information Product Identification Local Codes Unpacking Product FeaturesSafety Device Piezo Ignition SystemUnusually Tight Construction Fresh AIR for Combustion and VentilationProducing Adequate Ventilation Unconfined SpaceDetermining FRESH-AIR Flow for Heater Location Determining if You Have a Confined or Unconfined SpaceVentilation AIR Ventilation Air From Inside BuildingVentilation AIR Ventilation Air From OutdoorsInstallation Items Check GAS TypeLocating Heater Installing Heater to Wall Marking Screw LocationsInstalling Two Mounting Screws Folding AnchorPlacing Heater On Mounting Screws Connecting to GAS Supply Connecting to GAS Supply Checking GAS Connections Pressure Testing GAS Supply Piping SystemPressure Testing Heater GAS Connections Manual Shutoff ValveFor Your Safety Read Before Lighting Operating HeaterControl knob and turn counterclockwise C-clockwise Shutting Off Heater Operating Heater Inspecting BurnerPilot Flame Pattern Shutting Off Burner Only pilot stays litBurner Flame Pattern Correct Burner Flame PatternCleaning and Maintenance Trouble Shooting ODS/PILOT and Burner OrificeCabinet Observed Possible Remedy Problem Cause TROUBLE- ShootingCleaning and Mainte Ing statement at TopTechnical Service Service HintsParts Not Under Warranty Replacement Parts Service Publications AccessoryParts Under Warranty Valve GA5010Heater Exploded View Parts List KEY Part Number Description QTYWarranty Information Keep this Warranty

VN1000B specifications

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