Desa VFRMV24NB, VFRMV24PB, VFRMV18NB, VFRMV18PB AIR for Combustion Ventilation, Ventilation AIR

Page 7

AIR FOR COMBUSTION

AND VENTILATION

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 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 appliance

_________ Btu/Hr

Gas water appliance*

_________ Btu/Hr

Gas furnace

_________ Btu/Hr

Vented gas appliance

_________ Btu/Hr

Gas fireplace logs

_________ 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.

Example:

 

40,000

 

Gas water appliance

 

Btu/Hr

Vent-free appliance

+

33,000

Btu/Hr

Total

=

73,000

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)

73,000 Btu/Hr (actual amount of Btu/Hr used)

The space in the previous 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.

B.Vent room directly to the outdoors. See Ven- tilation Air From Outdoors, page 8.

C.Install a lower Btu/Hr appliance, 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:Iftheareainwhich the appliance 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, ANSI Z223.1/NFPA54 Section 5.3 or applicable local codes.

VENTILATION AIR

Ventilation Air From Inside Building

This fresh air would come from an adjoining un- confined space. When ventilating to an adjoining unconfined space, you must provide two perma- nent openings: one within 12" of the ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1 and 2, Figure 2 on page 8). You can also remove door into adjoining room (see option 3, Figure 2). Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for re- quired size of ventilation grills or ducts.

116412-01B

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Contents Ansi Z21.11.2b-2004 Ansi Z21.60-2003 Models VFRMV18NB, VFRMV18PB VFRMV24NB and VFRMV24PBTable of Contents Safety Information Safety Information Local Codes Optional Remote Control AccessoriesProduct Features Product IdentificationFor Appliance Location Air For Combustion VentilationProviding Adequate Ventilation Determining FRESH-AIR FlowVentilation AIR AIR for Combustion VentilationVentilation Air From Inside Building Ventilation Air From Outdoors InstallationCheck GAS Type Installation and Clearances for vent-free operationCeiling Minimum Noncombustible Material Clearances Safe InstallationFloor Clearances Mantel ClearancesMasonry Manufactured FireplaceFireplace Installing Damper Clamp Accessory for Vented OperationInstalling Remote Control Accessory bracket Installing Heater AssemblyInstallation Items Needed Connecting to GAS SupplyChecking GAS Connections Pressure Testing Gas Supply Propane/LP FromPiping System Test Pressures In Excess Of 1/2 Psig KPa Pressure Testing Heater Gas ConnectionsTest Pressures Equal To or Less Than Psig 3.5 kPa Operating Heater For Your Safety Read Before LightingLighting Instructions Shutting Off Heater Operating HeaterTo Turn OFF GAS To Appliance Propane/LPNaturalOn/Off Series Model HRC100 Manual Lighting ProcedureOptional Hand-Held Remote OperationInspecting Burners Safety FeaturesAuto Shutoff Feature Key Pad Lock FeatureBurner Flame Pattern Cleaning MaintenanceBurner Injector Holder Pilot Air Inlet Hole Propane/LP Cleaning MaintenanceWiring Diagram Technical ServiceObserved Problem Possible Cause Remedy TroubleshootingMaintenance, TroubleshootingOperation Processes and logs curing Hours of operation Checking Gas Connections Gas leak. See warningAccessories SpecificationsReplacement Parts Service HintsAccessories Models VFRMV18NB, VFRMV18PB, VFRMV24NB Shown and VFRMV24PB Illustrated Parts BreakdownParts List 116412-01B 116412-01B Keep this Warranty Warranty InformationLimited Warranty VENT-FREE GAS LOG Heaters

VFRMV18PB, VFRMV18NB, VFRMV24NB, VFRMV24PB specifications

The Desa VFRMV series is a sophisticated line of heating solutions known for its efficiency and modern design. The models in this series include the VFRMV24NB, VFRMV24PB, VFRMV18NB, and VFRMV18PB, each sharing a commitment to provide superior comfort and versatility in various living spaces.

One of the most notable features of the VFRMV series is its advanced heating technology. These units are equipped with a powerful burner system designed to maximize heat output while minimizing energy consumption. This makes the units not only environmentally friendly but also cost-effective, as users can enjoy warm indoor spaces without incurring high energy bills. The gas burners achieve a high thermal efficiency, ensuring that a significant amount of heat is delivered into the room promptly.

The VFRMV series is designed with customer convenience in mind. The models feature easy-to-read digital displays that allow users to adjust temperatures and settings effortlessly. These displays are intuitive, providing feedback on heating levels, operational status, and timer functions, enhancing the user experience. Furthermore, the inclusion of a remote control option allows homeowners to manage the heating from the comfort of their sitting area.

In terms of safety, the VFRMV series implements several key features. Each unit is equipped with an oxygen depletion sensor and a safety shut-off system. This ensures that the unit operates safely within its designated space, automatically shutting down if carbon monoxide levels rise or oxygen levels drop beyond safe limits. This commitment to safety provides peace of mind for households, making it a suitable choice for a wide range of environments.

Aesthetically, the VFRMV24NB and VFRMV24PB models feature a sleek design, with the "NB" models showcasing a bold black finish, while the "PB" variants offer a more classic propane-blue coloration. The smaller VFRMV18 series similarly combines elegance with functionality, ensuring that they can seamlessly blend into any home décor.

In summary, the Desa VFRMV24NB, VFRMV24PB, VFRMV18NB, and VFRMV18PB models exemplify modern heating solutions. With their advanced burner technology, user-friendly features, stringent safety measures, and stylish designs, they cater to contemporary requirements for effective indoor heating. Whether for residential or commercial use, the VFRMV series promises reliability and comfort all year round.
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