Desa CGN18B, RN30B 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 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.

100096

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Contents OWNER’S Operation and Installation Manual What to do if YOU Smell GASContents Safety Information 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 Right CeilingFloor 16 3/ 4 RN30BRemoving 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 Pressure Testing GAS Supply Piping System Checking GAS ConnectionsPressure Testing Heater GAS Connections Manual Shutoff ValveFor Your Safety Read Before Lighting Operating HeaterGRH/OV 007G Shutting Off Heater Operating Heater Inspecting BurnerPilot Flame Pattern Shutting Off Burner Only pilot stays litBurner Flame Pattern Correct Flame Pattern AT High PositionIncorrect Flame Pattern AT High Position ODS/PILOT and Burner Cleaning and Maintenance Trouble ShootingObserved Possible Problem Cause Remedy CabinetMaintenance, TROUBLE- ShootingFrom Ing statement at TopTechnical Service Service HintsRN30B CGN18B Replacement Parts Centrals Parts Under WarrantyParts Not Under Warranty Accessories Manual ShutoffFloor Mounting Stand GA4000B ODS/Pilot RN30B Parts List KEY Part Number Description QTY12-2 12-1 CGN18B Parts List Warranty Information Limited Warranty VENT-FREE Heaters

RN30B, CGN18B specifications

Desa CGN18B and RN30B are innovative indoor heating solutions that cater to both residential and commercial needs, offering efficient heating capabilities with advanced features. Both models have carved a niche for themselves in the market, owing to their reliable performance, user-friendly interfaces, and modern design.

The Desa CGN18B is a gas-fired vent-free heater that has garnered attention due to its sleek design and compact size, making it an excellent choice for smaller spaces. With a heating capacity of 18,000 BTUs, it can effectively warm up areas up to 700 square feet, which is ideal for bedrooms, living rooms, or even office settings. One of the standout features of the CGN18B is its thermostat, which allows users to maintain their desired room temperature, enhancing comfort while optimizing energy consumption. The model operates without the need for external venting, which simplifies installation and reduces overall costs. Additionally, the CGN18B boasts safety features such as an oxygen depletion sensor, which automatically shuts the heater off if oxygen levels fall below a safe threshold, ensuring peace of mind for users.

On the other hand, the Desa RN30B is a dual-fuel heater that offers versatility by accommodating both liquid propane and natural gas. This flexibility makes it a preferred option for homeowners who may want to switch fuel sources based on availability or preference. With a robust heating capacity of 30,000 BTUs, the RN30B can comfortably heat larger spaces, up to 1,000 square feet. This model is particularly designed for heavy-duty use, making it suitable for workshops or larger living areas. The RN30B comes equipped with an electronic ignition system that simplifies startup, eliminating the need for matches or lighters. Moreover, its sleek design allows it to blend seamlessly with various interior styles, while the easy-to-use control panel enhances user experience.

Both models showcase advanced heating technologies, such as radiant heat distribution, which ensures warmth is spread evenly throughout the room. Furthermore, the efficient combustion technology employed in both units maximizes fuel utilization, thereby minimizing environmental impact while lowering energy expenses.

In conclusion, Desa CGN18B and RN30B are exemplary choices in the realm of indoor heaters. Their unique features, enhanced safety measures, and efficiency render them highly suitable options for those seeking dependable and effective heating solutions. Whether for a cozy home environment or a larger workspace, these models are designed to meet diverse heating needs effectively.