Desa installation manual Fresh AIR, Determining FRESH-AIR Flow for Heater Location

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FRESH AIR

DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION

FOR

Determining if You Have a Confined or Unconfined Space

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

COMBUSTION

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

AND

doorless passageways or ventilation grills between the rooms.

 

 

 

 

 

VENTILATION

1. Determine the volume of the space (length x width x height).

Length x Width x Height =

___________________

cu. ft. (volume of space)

Continued

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

 

+

18,000

 

BTU/Hr

 

 

Total

 

=

 

 

 

BTU/Hr

 

 

 

58,000

 

*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: 51,200

BTU/Hr (maximum the space can support)

58,000

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.

6

099569

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Contents OWNER’S Operation and Installation Manual What to do if YOU Smell GASContents Safety Information001 Unpacking Product IdentificationLocal Codes ProductVentilation Fresh AIR ForCombustion Producing Adequate VentilationFresh AIR Determining FRESH-AIR Flow for Heater LocationDetermining if You Have a Confined or Unconfined Space Fresh AIR for Combustion and Ventilation Ventilation AIRVentilation Air From Inside Building Ventilation AIR Ventilation Air From OutdoorsCheck GAS Type Installing To WallInstallation Items Locating HeaterLocating Thermostat Sensing Bulb Thermostat Sensing BulbThermostat Models Only Attaching Thermostat Sensing BulbRemoving Front Panel Of Heater Installing Heater to WallMounting Bracket Methods For Attaching Mounting Bracket To WallMarking Screw Locations Attaching Mounting Bracket To WallInstalling Bottom Mounting Screws Placing Heater On Mounting BracketConnecting to GAS Supply Connections Pressure Testing GAS Supply Piping SystemChecking GAS Servicing. Correct all leaks at oncePressure Testing Heater GAS Connections CheckingFor Your Safety Read Before Lighting Operating HeaterOperating HeaterShutting Off Heater Shutting Off Burner Only pilot stays litNon-Thermostat Model Model Inspecting Burner Pilot Flame PatternBurner Flame Pattern Correct Burner Flame PatternCabinet Trouble ShootingODS/PILOT and Burner Air PassagewaysCleaning and Mainte TroubleTROUBLE- Shooting Ing statement at TopTechnical Service Service Hints Service Publications18,000 BTU/Hr 28,000 BTU/Hr Models Parts Parts Under WarrantyParts Not Under Warranty CentralsAccessories Floor Mounting Stand 18,000 BTU/Hr Models GA4000BValve GA5010 Illustrated Parts List Manual Control 18,000 BTU/Hr Non Thermostat ModelShown. See page 31 for Manual Control Valve Parts List Description QTY099569 099569 Warranty Information Keep this Warranty

A specifications

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