Bryant 345MAV instruction manual AIR Ducts, General Requirements, Ductwork acoustical treatment

Page 16

PERFORATED

DISCHARGE DUCT

FLANGE

NO

YES

210°

MIN

YES

V.AIR DUCTS

A.General Requirements

The duct system should be designed and sized according to accepted national standards such as those published by: Air Conditioning Contractors Association (ACCA), Sheet Metal and Air Conditioning Contractors National Association (SMACNA) or American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). Or consult factory The Air Systems Design Guidelines 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.

When a furnace is installed so that the supply ducts carry air to areas outside the space containing the furnace, the return air must 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.

Fig. 17ÐDuct Flanges

FURNACE

(OR COIL CASING

WHEN USED)

A93029

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.

B.Ductwork acoustical treatment

DOWNFLOW

SUBBASE

SHEET METAL

PLENUM

A78651

Fig. 18ÐFurnace, Plenum, and Subbase Installed on a

Combustible Floor

IV. INSTALLATION IN HORIZONTAL APPLICATIONS

These furnaces can be installed horizontally in either horizontal left or right discharge position. In a crawlspace, furnace can either be hung from floor joist or installed on suitable blocks or pad. Furnace can be suspended from each corner by hanger bolts and angle iron supports. (See Fig. 19.) Cut hanger bolts (4 each 3/8-in. all-thread rod) to desired length. Use 1 X 3/8-in. flat washers, 3/8-in. lockwashers, and 3/8-in. nuts on hanger rods as shown in Fig. 19. Dimples are provided for hole locations. (See Fig. 2.)

CAUTION: The entire length of furnace MUST be supported when furnace is used in a horizontal position to ensure proper draining.

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 if constructed and installed in accordance with the latest edition of SMACNA construction standard on fibrous glass ducts. Both acoustical lining and fibrous ductwork shall comply with NFPA 90B as tested by UL Standard 181 for Class 1 Rigid air ducts.

C.Supply Air Connections

UPFLOW FURNACES

Connect supply-air duct to 3/4-in. flange on furnace supply-air outlet. The supply-air duct attachment must ONLY be connected to furnace supply-/outlet-air duct flanges or air conditioning coil casing (when used). DO NOT cut main furnace casing to attach supply side air duct, humidifier, or other accessories. All accesso- ries MUST be connected external to furnace main casing.

DOWNFLOW FURNACES

Connect supply-air duct to supply-air opening on furnace. The supply-air duct attachment must ONLY be connected to furnace supply/outlet or air conditioning coil casing (when used), when installed on non-combustible material. When installed on combus- tible material, supply-air duct attachment must ONLY be con- nected to an accessory subbase or factory approved air condition- ing coil casing. DO NOT cut main furnace casing to attach supply side air duct, humidifier, or other accessories. All accessories MUST be connected external to furnace main casing.

HORIZONTAL FURNACES

Connect supply-air duct to supply air opening on furnace. The supply-air duct attachment must ONLY be connected to furnace supply/outlet or air conditioning coil casing (when used). DO NOT cut main furnace casing to attach supply side air duct, humidifier, or other accessories. All accessories MUST be connected external to furnace main casing.

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Contents Electrostatic Discharge ESD Precautions Ð1ÐDimensions → ÐDimensional DrawingÐ2Ð Unit SizeSafety Considerations Electrostatic Discharge ESD PrecautionsMinimum Inches Clearance to Combustible Construction → ÐClearances to CombustiblesIntroduction Applications GeneralII. Upflow Applications Condensate Trap Location Factory-Shipped OrientationÐ5Ð Condensate Trap Location Alternate Upflow OrientationÐ6Ð Pressure Switch TubingCondensate Trap Field Drain Attachment Condensate Trap Freeze Protection III. Downflow ApplicationsCondensate Trap Location Condensate Trap TubingIV. Horizontal Left SUPPLY-AIR Discharge Applications Ð8ÐConstruct a Working Platform Horizontal Right SUPPLY-AIR Discharge ApplicationsÐ9Ð ÐAttic Location and Working Platform Front Upflow or Downflow Horizontal II. Furnace Location Relative to Cooling Equipment III. Hazardous Locations AIR for Combustion and Ventilation GeneralII. Unconfined Space III. Confined SpaceCombustion AIR from Outdoors Through Vertical Ducts Installation Leveling Legs if DesiredCombustion AIR from Outdoors Through Horizontal Ducts Opening Dimensions II. Installation on a Concrete SlabFurnace Casing Width IV. Installation in Horizontal Applications AIR DuctsGeneral Requirements Ductwork acoustical treatmentReturn Air Connections VI. Filter ArrangementÐfilter Information VII. Bottom Closure PanelVIII. GAS Piping 171⁄2-IN. Wide Casings onlyElectrical Connections Ðmaximum Capacity of Pipe CU FT PER HRNominal Length of Pipe FT Iron Internal Diameter Size Wiring Length FT³ CKT BKR Amps PhaseÐelectrical Data Amps SizeÐWiring Diagram II -V Wiring III. AccessoriesVenting Removal of Existing Furnaces from Common Vent SystemsGeneral II. COMBUSTION-AIR and Vent PipingCombustion Air Pipe ÐCombustion-Air Inlet Pipe Assembly 3001 to Ðmaximum Allowable Vent Pipe Length FT4001 to 5000² Ðmaximum Allowable Vent Pipe Length FT 5001 to 6000²6001 to 7000² 7001 to 8000²ÐShort Vent 5 to 8 Ft System 9001 to 10,000²Vent Extension Pipe 040 060 080 100 120III. Vent Termination IV. MultiventingCondensate Drain General Ðvent Pipe Termination ClearancesÐRoof Termination Preferred Heating Mode II. Cooling ModeIII. Continuous Blower Mode IV. Heat Pump ModeSTART-UP Procedures General Component TestComponent Test Sequence II. Prime Condensate Trap with Water→ ÐInducer Housing Drain Tube IV. AdjustmentsIII. Purge GAS Lines Set Gas Input RateBTU/CU FT AltitudeOnly 40015000 Only 50017001 7758000 Only 8001Example Ðaltitude Derate Multiplier for U.S.AAltitude Derate Multiplier Factor for U.S.A Set Temperature Rise Blower Off Delay Heat ModeÐgas Rate CU FT/HR ±SPEED SelectorII. Check Pressure Switch Check Safety Controls Check Primary Limit ControlChecklist Checklistðinstallation CHECKLISTÐSTART-UPLoad Calculation Vent Piping
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345MAV specifications

The Bryant 345MAV is a premier choice in the realm of residential heating and cooling systems, encapsulating advanced technologies, high efficiency, and remarkable performance. Designed for homeowners seeking reliability and comfort, this model exemplifies modern HVAC (Heating, Ventilation, and Air Conditioning) innovations.

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