Bryant 340MAV instruction manual Duct Flanges, II. Ductwork Acoustical Treatment

Page 16

PERFORATED

DISCHARGE DUCT

FLANGE

NO

YES

210°

MIN

YES

When a furnace is installed so that the supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air shall also be handled by a duct(s) sealed to the furnace casing and terminating outside the space containing the furnace.

Secure ductwork with proper fasteners for type of ductwork used. Seal supply- and return-duct connections to furnace with code approved tape or duct sealer.

Flexible connections should be used between ductwork and furnace to prevent transmission of vibration. Ductwork passing through unconditioned space should be insulated to enhance system performance. When air conditioning is used, a vapor barrier is recommended.

Maintain a 1-in. clearance from combustible materials to supply air ductwork for a distance of 36 in. horizontally from the furnace. See NFPA 90B or local code for further requirements.

Fig. 21—Duct Flanges

A93029

For a furnace not equipped with a cooling coil, the outlet duct shall be provided with a removable access panel. This opening shall be accessible when the furnace is installed and shall be of such a size that the heat exchanger can be viewed for possible openings using light assistance or a probe can be inserted for sampling the air

Air Conditioning Contractors National Association (SMACNA) or American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE) or consult The Air Systems Design Guide- lines reference tables available from your local distributor. The duct system should be sized to handle the required system design CFM at the design static pressure.

stream. The cover attachment shall prevent leaks.

II. DUCTWORK ACOUSTICAL TREATMENT

Metal duct systems that do not have a 90 degree elbow and 10 ft of main duct to the first branch take-off may require internal acoustical lining. As an alternative, fibrous ductwork may be used

3⁄8-IN. ROD

ANGLE

IRON OR

EQUIVALENT

 

(B)

 

 

(A)

 

(B)

 

 

(A) ROD LOCATION

 

 

USING DIMPLE

 

 

LOCATORS

3/8-IN. HEX NUT

(A)

(SEE DIMENSIONAL

DWG FOR

& WASHER (4)

 

LOCATIONS)

REQD PER ROD

 

53⁄4″

ALTERNATE SUPPORT LOCATION 4-IN. MIN 8-IN. MAX

DRAIN

(A)

(B)

13/16-IN. MAX

(B)ALTERNATE SUPPORT LOCATION FROM BACK

(A)PREFERRED ROD LOCATION

(B)ALTERNATE ROD LOCATION

NOTES: 1. A 1 In. clearance minimum between top of furnace and combustible material.

2.The entire length of furnace must be supported when furnace is used in horizontal position to ensure proper drainage.

A93304

Fig. 22—Crawlspace Horizontal Application

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Contents Electrostatic Discharge ESD Precautions Safety ConsiderationsMultipoise Orientations Dimensions Unit SizeSafety II. General InstallationVI. GAS Piping and GAS Pipe Pressure Testing Codes and StandardsElectrostatic Discharge ESD Precautions VII. Electrical ConnectionsIntroduction ApplicationsGeneral II. Upflow ApplicationsPressure Switch Tubing Condensate Trap Tubing Factory-Shipped OrientationCondensate Trap Location Alternate Upflow Orientation Condensate Trap Tubing Alternate Upflow OrientationCondensate Trap Location III. Downflow ApplicationsCondensate Trap Tubing Horizontal Left Tube Configuration Construct a Working Platform IV. Horizontal Left SUPPLY-AIR Discharge ApplicationsHorizontal Right SUPPLY-AIR Discharge Applications Attic Location and Working Platform Location Furnace Location for Proper Condensate Drainage II. Furnace Location Relative to Cooling EquipmentII. Installation in Upflow or Downflow Applications Installation Leveling Legs if DesiredIII. Installation in Horizontal Applications III. Hazardous LocationsFurnace Plenum Opening Floor Opening Casing Opening DimensionsWidth Duct Flanges II. Ductwork Acoustical TreatmentIII. Supply AIR Connections IV. Return AIR ConnectionsFilter Arrangement Filter InformationVI. Bottom Closure Panel VII. GAS PipingMaximum Capacity of Pipe Casings onlyFire or Explosion Hazard Electrical ConnectionsWiring III AccessoriesPCB Electrical Data Direct VentingRemoval of Existing Furnaces from Common Vent Systems II. COMBUSTION-AIR and Vent PipingControl Center COMBUSTION-AIR and Vent Pipe Termination Clearances Clearance FTExample Combustion-Air and Vent Pipe DiameterCombustion-Air and Vent Pipe Attachment COMBUSTION-AIR Intake Housing Plug Fitting Short Vent 5 to 8 Ft SystemMaximum Allowable Pipe Length FT Altitude FT6001 to 7000‡ Air Intake Housing Plug Fitting Drain Extended Exposed Sidewall Pipes Vent Extension PipeTwo-Pipe Termination Kit Concentric Vent/Air Termination Kit IV. Multiventing and Vent TerminationsRoof Termination Preferred Sidewall Termination of 12 in. or Less II. Application Condensate Drain GeneralIII. Condensate Drain Protection Heating Mode II. Cooling ModeIII. Continuous Blower Mode IV. Heat Pump ModeSTART-UP Procedures General IV. AdjustmentsComponent Test II. Prime Condensate Trap with WaterInducer Housing Drain Cap BTU/CU FT Orifice Manifold 625 650 Only 7001 675 725 8000 775 750 15% 825 2001to 725 750 Only 4001 775 800 825 5000 875 850 900 925 Example 100,000 Btuh Input Furnace Installed AT 4300 FT Altitude Derate MultiplierUnited States CanadaBlower OFF Delay Setup Position Check Safety ControlsGAS Rate CU FT/HR Speed SelectorChecklist II. Check Pressure SwitchCheck Primary Limit Control CHECKLIST-INSTALLATION CHECKLIST-START-UPLoad Calculation Combustion AIR Vent Piping
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