Desa CBT30NT, CBT30PT Determining FRESH-AIR Flow for Heater Location, Ventilation AIR

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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 confined 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. (6.1 m) (length) x 16 ft. (4.88 m) (width) x 8 ft. (2.44 m) (ceiling height) = 2560 cu. ft. (72.49 m3) (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.Multiply the space volume by 20 to determine the maximum Btu/Hr the space can support.

__________ (volume of space) x 20 = (Maxi- mum Btu/Hr the space can support)

Example: 2560 cu. ft. (72.49 m3) (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 provide additional fresh air. Your options are as follows:

A.Rework worksheet, adding the space of an adjoin- ing 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 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 un- confined 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/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 permanent openings: one within 12" (30.4 cm) of the ceiling and one within 12" (30.4 cm) of the floor on the wall connecting the two spaces (see options 1 and 2, Figure 2, page 7). You can also remove door into adjoining room (see option 3, Figure 2, page 7). Follow the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts.

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Contents What to do if YOU Smell GAS Table of Contents Safety Information Local Codes Product FeaturesSafety Device Ignition SystemFollowing are excerpts from National Fuel AIR for Combustion VentilationProviding Adequate Ventilation Unusually Tight ConstructionDetermining if You Have a Confined or Unconfined Space Determining FRESH-AIR Flow for Heater LocationVentilation AIR Ventilation Air From Inside BuildingCheck GAS Type AIR for Combustion Ventilation InstallationInstallation Items Ventilation Air From OutdoorsLocating Heater Thermostat Sensing BulbRemoving Front Panel Of Heater Installing Heater to WallMounting Bracket Marking Screw LocationsAttaching To Wall Anchor Method Installing Bottom Mounting ScrewsAttaching To Wall Stud Method Placing Heater On Mounting BracketMounting Heater to Floor Optional Connecting to GAS SupplyMounting Base Feet to Floor Where required by local code Mounting Base Feet to HeaterAppliance Apply pipe joint sealant lightly to male NPT Dealer. See Accessories,Be upstream from heater see Figure Clogged heater valvesChecking GAS Connections Test Pressures In Excess Of 1/2 Psig 3.5 kPaTest Pressures Equal To or Less Than 1/2 Psig 3.5 kPa For Your Safety Read Before Lighting Operating HeaterLighting Instructions To Turn OFF GAS To Appliance Manual Lighting ProcedureInspecting Heater Thermostat Control OperationODS/PILOT and Burner Soft bristled brush to cleanBurner Flame Pattern Burner Pilot AIR InletTechnical Service Cleaning MaintenanceService Hints When Gas Pressure Is Too LowControl knob is not in pilot position TroubleshootingObserved Problem Possible Cause Remedy Contact local propane/LP gas companyAssembly Goes out when control knob is Control knob not pressedProblem could be caused by Delayed ignition of burners Manifold pressure is too lowSlight smoke or odor during Noise when burner is litWhen heated, vapors from Turn heater off when using Initial operation Processes Hours of operationGas leak. See Warning Specifications Replacement Parts Service PublicationsIllustrated Parts Breakdown Parts List 111435-01 Electronic Ignitor 097159-04 Piezo IgnitorFront Panel 107954-01 107955-01 FAN Kits GA3250T AccessoriesEquipment Shutoff Valve GA5010 Floor Mounting KIT GA4550Parts Central Warranty Information Keep this Warranty

CBT30NT, CBT30PT specifications

The Desa CBT30NT and CBT30PT are high-performance heating solutions designed to deliver efficient warmth for both residential and commercial applications. These units are known for their reliability, innovative features, and easy integration into various spaces. They are particularly suited for those seeking effective heating options without compromising on energy efficiency.

The CBT30NT, or the natural gas version, stands out with its ability to provide consistent warmth through a direct vent system. This allows for safe operation while minimizing the impact on indoor air quality. It effectively draws combustion air from outside, which is essential for spaces with limited ventilation. The CBT30PT, on the other hand, is a propane variant, providing flexibility for users who may not have access to natural gas lines. Both models are designed with user convenience in mind, featuring a simple control system that allows for easy adjustments and temperature settings.

One of the key characteristics of these heaters is their advanced thermostat control, which enables precise temperature management. This feature ensures energy usage is optimized, preventing unnecessary heating and reducing utility costs. The compact and sleek design of the CBT30NT and CBT30PT allows them to fit seamlessly into any room without being an eyesore.

The heaters are equipped with durable materials, providing resilience against the rigors of daily use. They feature safety mechanisms, including flame failure safety devices, ensuring peace of mind for users. Furthermore, both models incorporate a forced air design, which disperses heat efficiently throughout the space, eliminating cold spots and creating a more uniform climate.

In summary, the Desa CBT30NT and CBT30PT are ideal heating solutions that combine safety, efficiency, and aesthetic appeal. Their natural gas and propane options respectively cater to a diverse range of user needs, making them versatile choices for enhanced comfort. With their advanced technology and user-friendly features, these heaters are a worthy investment for anyone in need of reliable heating solutions. Emphasizing energy efficiency and user safety, they represent the next generation of residential and commercial heating systems.
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