Bryant 345MAV Return Air Connections, VI. Filter Arrangement, Ðfilter Information

Page 17

D.Return Air Connections

1. Upflow Furnaces

The return-air duct must be connected to bottom, sides (left or right), or a combination of bottom and side(s) of main furnace casing as shown in Fig. 1. Bypass humidifier may be attached into unused side return air portion of the furnace casing. DO NOT connect any portion of return-air duct to back of furnace casing.

2. Downflow and Horizontal Furnaces

The return-air duct must be connected to return-air opening provided as shown in Fig. 1. DO NOT cut into casing sides or back to attach any portion of return-air duct. Bypass humidifier connec- tions should be made at ductwork or coil casing sides exterior to furnace.

VI. FILTER ARRANGEMENT

CAUTION: Never operate unit without a filter or with blower access panel removed.

Factory-supplied washable framed filters are shipped in blower compartment. Determine location for filter and relocate filter retaining wire if necessary. See Table 1 to determine correct filter size for desired filter location. Table 1 indicates filter size, location, and quantity shipped with this furnace. See Fig. 2 for location and size of bottom and side return-air openings.

TABLE 1ÐFILTER INFORMATION

FURNACE

FILTER SIZE (IN.)*

 

FILTER TYPE

CASING

 

 

 

Side Return

Bottom Return

FRAMED

WIDTH (IN.)

 

17-1/2

(1) 16 X 25 X 1²

(1) 16 X 25

X 1

Cleanable

21

(1) 16 X 25 X 1

(1) 20 X 25

X 1²

Cleanable

24-1/2

(2) 16 X 25 X 1²

(1) 24 X 25

X 1

Cleanable

 

 

 

 

 

*Filters can be field modified by cutting frame as marked and folding to desired size. Alternate sizes can be ordered from your distributor or dealer.

² Factory-provided with furnace.

CAUTION: Air delivery above 1800 CFM requires that both sides, a combination of 1 side and bottom, or bottom only of furnace be used for return air.

NOTE: Side return-air openings can ONLY be used in UPFLOW configurations. Install filter(s) as shown in Fig. 20.

Bottom return-air opening may be used with all 4 orientations. Filter may need to be cut to fit some furnace widths. Install filter as shown in Fig. 21.

NOTE: Remove and discard bottom closure panel when bottom inlet is used.

VII. BOTTOM CLOSURE PANEL

These furnaces are shipped with bottom enclosure panel installed in bottom return-air opening. This panel MUST be in place when side return air is used.

A 3-IN. MINIMUM

COMBUSTION-AIR

INTAKE

CLEARANCE TO

 

COMBUSTION-AIR INTAKE

 

IS REQUIRED.

 

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

NOTES:

 

 

(A)PREFERRED ROD LOCATION

(B)ALTERNATE ROD LOCATION

VENT

3⁄8-IN. ROD

5 3⁄4″

ALTERNATE SUPPORT

LOCATION 4-IN. MIN 8-IN. MAX

DRAIN

(A)

(B)

13/16-IN. MAX

(B)ALTERNATE SUPPORT LOCATION FROM BACK

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.

3.Bottom side combustion-air entry cannot be used when furnace is installed with hangers as shown.

A96209

Fig. 19ÐCrawlspace Horizontal Application

Ð17Ð

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Contents Ð1Ð Electrostatic Discharge ESD Precautions→ ÐDimensional Drawing DimensionsÐ2Ð Unit SizeElectrostatic Discharge ESD Precautions Safety ConsiderationsMinimum Inches Clearance to Combustible Construction → ÐClearances to CombustiblesApplications General IntroductionII. Upflow Applications Condensate Trap Location Factory-Shipped OrientationCondensate Trap Location Alternate Upflow Orientation Ð5ÐCondensate Trap Field Drain Attachment Pressure Switch TubingÐ6Ð III. Downflow Applications Condensate Trap Freeze ProtectionCondensate Trap Location Condensate Trap TubingÐ8Ð IV. Horizontal Left SUPPLY-AIR Discharge ApplicationsÐ9Ð Horizontal Right SUPPLY-AIR Discharge ApplicationsConstruct a Working Platform ÐAttic Location and Working Platform Front Upflow or Downflow Horizontal II. Furnace Location Relative to Cooling Equipment AIR for Combustion and Ventilation General III. Hazardous LocationsII. Unconfined Space III. Confined SpaceCombustion AIR from Outdoors Through Horizontal Ducts Installation Leveling Legs if DesiredCombustion AIR from Outdoors Through Vertical Ducts Furnace Casing Width II. Installation on a Concrete SlabOpening Dimensions AIR Ducts IV. Installation in Horizontal ApplicationsGeneral Requirements Ductwork acoustical treatmentVI. Filter Arrangement Return Air ConnectionsÐfilter Information VII. Bottom Closure Panel171⁄2-IN. Wide Casings only VIII. GAS PipingNominal Length of Pipe FT Iron Internal Diameter Size Ðmaximum Capacity of Pipe CU FT PER HRElectrical Connections Length FT³ CKT BKR Amps Phase WiringÐelectrical Data Amps SizeÐWiring Diagram III. Accessories II -V WiringVenting Removal of Existing Furnaces from Common Vent SystemsCombustion Air Pipe II. COMBUSTION-AIR and Vent PipingGeneral ÐCombustion-Air Inlet Pipe Assembly 4001 to 5000² Ðmaximum Allowable Vent Pipe Length FT3001 to 5001 to 6000² Ðmaximum Allowable Vent Pipe Length FT6001 to 7000² 7001 to 8000²9001 to 10,000² ÐShort Vent 5 to 8 Ft System040 060 080 100 120 Vent Extension PipeIV. Multiventing III. Vent TerminationCondensate Drain General Ðvent Pipe Termination ClearancesÐRoof Termination Preferred II. Cooling Mode Heating ModeIII. Continuous Blower Mode IV. Heat Pump ModeComponent Test START-UP Procedures GeneralComponent Test Sequence II. Prime Condensate Trap with WaterIV. Adjustments → ÐInducer Housing Drain TubeIII. Purge GAS Lines Set Gas Input RateAltitude BTU/CU FT4001 Only5000 Only 5001775 70018000 Only 8001Altitude Derate Multiplier Factor for U.S.A Ðaltitude Derate Multiplier for U.S.AExample Blower Off Delay Heat Mode Set Temperature RiseÐgas Rate CU FT/HR ±SPEED SelectorChecklist Check Safety Controls Check Primary Limit ControlII. Check Pressure Switch CHECKLISTÐSTART-UP ChecklistðinstallationLoad 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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In summary, the Bryant 345MAV is a top-tier solution for residential climate control, blending energy efficiency, innovative technology, and unmatched reliability. With its variable-speed operation, environmentally friendly refrigerant, and smart features, the 345MAV represents a significant advancement in the HVAC field. Homeowners investing in this model can expect a system that not only meets their heating and cooling needs but exceeds them in terms of efficiency and comfort.
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