Desa 10542 installation manual 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 con- fined or unconfined space.

Space: Includes the room in which you will install heater plus any adjoining rooms with doorless pas- sageways 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. (vol- ume of space)

If additional ventilation to adjoining room is sup- plied 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 = (Maximum Btu/Hr the space can support)

Example: 2560 cu. ft. (volume of space) x 20 = 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

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

Example:

 

Gas water heater

40,000

______________ Btu/Hr

Vent-free heater

20,000

+ _____________ Btu/Hr

Total

60,000

= _____________ 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:

51,200 Btu/Hr (maximum the space can support)

60,000 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 pro- vide additional fresh air. Your options are as follows:

A.Rework worksheet, adding the space of an ad- joining room. If the extra space provides an un- confined space, remove door to adjoining room or add ventilation grills between rooms. See Ven- tilation Air From Inside Building, page 7.

B.Vent room directly to the outdoors. See Ventila- tion Air From Outdoors, page 7.

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 oper- ated 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/NFPA 54 Section

5.3or applicable local codes.

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Contents What to do if YOU Smell GAS Table of Contents Safety Information Product Identification Product FeaturesLocal Codes UnpackingUnusually Tight Construction AIR for Combustion VentilationProviding Adequate Ventilation Confined and Unconfined SpaceDetermining FRESH-AIR Flow for Heater Location Determining if You Have a Confined or Unconfined SpaceCheck GAS Type InstallationVentilation AIR Ventilation Air From Inside BuildingInstallation Items Locating HeaterInstalling Heater to Wall 10,000 Btu/Hr Model 30,000 Btu/Hr Model20,000 Btu/Hr Model Attaching To Wall Anchor MethodMounting Heater to Floor with Optional Floor KIT Installing Bottom Mounting ScrewsMounting Base Feet to Floor Where required by local code Placing Heater On Mounting BracketConnecting to GAS Supply Typical Inlet Pipe DiametersNatural Gas Propane/LPPressure Testing Heater GAS Connections Test Pressures Equal To or Less Than 1/2 Psig 3.5 kPaManual Control Models For Your Safety Read Before Lighting Operating HeaterLighting Instructions Shutting Off Heater Manual Lighting ProcedureTo Turn OFF GAS To Appliance Shutting Off Burner Only pilot stays litThermostat Control Operation Inpecting Heater Pilot Flame PatternBurner Flame Pattern Burner Pilot AIR Inlet Cleaning MaintenanceODS/PILOT and Burner CabinetTroubleshooting Observed Problem Possible Cause RemedyReplace burner orifice See Cleaning and Mainte Gas leak. See Warning Statement above10549 10547 10545 Specifications10548 10546 10542/10544 10543Service Publications Replacement Parts Service HintsTechnical Service Parts Under WarrantyIllustrated Parts Breakdown 10,000 BTU/HR Manual Control Models 10542Parts List 10,000 BTU/HR Manual Control Models19-1 19-2 19-113 10,000, 20,000, and 30,000 BTU/HR Termostat Models FAN Kits GA3210T AccessoriesEquipment Shutoff Valve GA5010 Base KIT GA4550Parts Centrals Warranty Information Keep this WarrantyLimited Warranty VENT-FREE Residential GAS Heaters

10542 specifications

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