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Bryant 355MAV Floorand Plenum Opening Dimensions, Furnace,Plenum, and Subbase Installed

Models: 355MAV

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Fig. 18—Floor and Plenum Opening Dimensions

	A
	PLENUM
	OPENING
B	D
	FLOOR
	OPENING
	C

A96283

Fig. 18—Floor and Plenum Opening Dimensions

FURNACE

(OR COIL CASING

WHEN USED)

COMBUSTIBLE

FLOORING

DOWNFLOW

SUBBASE

SHEET METAL

PLENUM

FLOOR

OPENING

A96285

Fig. 19—Furnace, Plenum, and Subbase Installed

on a Combustible Floor

NOTE: Remove furnace perforated, supply-air duct flanges when they interfere with mating flanges on coil or downflow subbase. To remove perforated, supply-air duct flanges, use wide duct pliers, duct flange tool, or hand seamers to bend flange back and forth until it breaks off. Be careful of sharp edges. (See Fig. 21.)

WARNING: Do not bend duct flanges inward as shown in Fig. 21. This will affect airflow across heat exchangers and may cause limit cycling or premature heat exchanger failure. Remove duct flange completely or bend it inward a minimum of 210° as shown in Fig. 21.

PROCEDURE 3—INSTALLATION IN HORIZONTAL APPLICATIONS

These furnaces can be installed horizontally in either horizontal left or right discharge position. In a crawlspace, the 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. 22.) 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. lock washers, and 3/8-in. nuts on hanger rods as shown in Fig. 22. Dimples are provided for hole locations. (See Fig. 2.)

—19—

Image 19

Bryant 355MAV Floorand Plenum Opening Dimensions, Furnace,Plenum, and Subbase Installed, on a Combustible Floor

Contents

355MAV TABLE OF CONTENTSInstallation, Start-up,and Operating Instructions Deluxe 4-WayMultipoiseGeneral CODES AND STANDARDS SAFETY CONSIDERATIONSFig. 1-MultipoiseOrientations INTRODUCTIONFig. 2-DimensionalDrawing Dimensions inINSTALLATION Fig. 3-Clearancesto CombustiblesAPPLICATIONS PROCEDURE 1-GENERAL ELECTROSTATIC DISCHARGE ESD PRECAUTION PROCEDUREFig. 4-CondensateTrap Shown with Blower Access Panel Removed Fig. 5-Factory-ShippedUpflow Tube ConfigurationPROCEDURE 2-UPFLOWAPPLICATIONS h.Attach tube to coupling and clamp securely Left-HandTrap Installation F. Pressure Switch TubingPROCEDURE 3-DOWNFLOWAPPLICATIONS Fig. 7-DownflowTube ConfigurationRight-HandTrap Installation Fig. 8-DownflowTube ConfigurationB. Condensate Trap Tubing A. Condensate Trap Location D. Pressure Switch TubingC.Condensate Trap Field Drain Attachment E. Condensate Trap Freeze ProtectionD. Pressure Switch Tubing Fig. 9-HorizontalLeft Tube ConfigurationC. Condensate Trap Field Drain Attachments F. Construct a Working PlatformA. Condensate Trap Location Fig. 10-AtticLocation and Working PlatformB. Condensate Trap Tubing C. Condensate Trap Field Drain Attachment Fig. 11-HorizontalRight Tube ConfigurationD. Pressure Switch Tubing Drainage LOCATION PROCEDURE 1-GENERALFig. 13-Return-AirTemperature Fig. 12-FurnaceLocation for Proper CondensatePROCEDURE 2-LOW-FIREONLY INSTALLATION Fig. 14-ProhibitInstallation on BackFig. 15-FreezeProtection 1.Size gas piping based on the high-fireinput PROCEDURE 4-HAZARDOUSLOCATIONSFig. 16-Installationin a Garage INSTALLATION PROCEDURE 1-LEVELINGLEGS IF DESIREDFig. 17-LevelingLegs Table 1-OpeningDimensions inFig. 19-Furnace,Plenum, and Subbase Installed Fig. 18-Floorand Plenum Opening Dimensionson a Combustible Floor Fig. 21-DuctFlanges Fig. 20-Furnace,Plenum, and Coil Assembly orCoil Box Installed on a Combustible Floor PROCEDURE 4-AIRDUCTS A. General RequirementsUPFLOW FURNACES Fig. 22-CrawlspaceHorizontal ApplicationB. Ductwork Acoustical Treatment C. Supply Air ConnectionsPROCEDURE 7-GASPIPING PROCEDURE 5-FILTERARRANGEMENTFig. 23-FilterInstalled for Side Inlet PROCEDURE 6-BOTTOMCLOSURE PANELFig. 25-RemovingBottom Closure Panel Fig. 24-BottomFilter Arrangement171⁄2-IN.WIDE CASINGS ONLY Fig. 26-TypicalGas Pipe Arrangement Table 3-MaximumCapacity of PipeA. 115-VWiring PROCEDURE 8-ELECTRICALCONNECTIONSTable 4-ElectricalData Fig. 28-DisconnectSwitch and FurnaceB. 24-VWiring C.AccessoriesFig. 29-Relocating J-Box PROCEDURE 9-DIRECTVENTINGFig. 30-UnitWiring Diagram GENERAL Fig. 31-ControlCenterFig. 32-EACTerminals on Control Center B. Combustion-Airand Vent PipingFig. 33-355MAVVariable Speed Furnace Control Fig. 34-ThermidistatConnectionPage Fig. 36-Combustion-Airand Vent Pipe Connections COMBUSTION-AIRAND VENT PIPE DIAMETER Fig. 37-ShortVent 5 to 8 ft SystemCOMBUSTION-AIRAND VENT PIPE ATTACHMENT Table 7-MaximumAllowable Pipe Length ftTable 7-MaximumAllowable Pipe Length ft Continued Table 7-MaximumAllowable Pipe Length ft Continued Fig. 38-IntakeHousing Plug Fitting DrainFig. 39-RoofTermination Preferred Fig. 42-SidewallTermination of 12 in. or More CONCENTRIC VENT/AIR TERMINATION KIT Fig. 43-SidewallTermination of Less than 12 inEXTENDED EXPOSED SIDEWALL PIPES TWO-PIPETERMINATION KITAmbient PROCEDURE 10-CONDENSATEDRAIN A. GeneralD. Multiventing and Vent Terminations C. Condensation Drain Protection B. ApplicationFig. 48-SidewallTermination of More than 12 in Fig. 47-SidewallTermination of 12 in. or LessFig. 50-CondensateTrap Heat Tape Fig. 49-Exampleof Field Drain AttachmentSEQUENCE OF OPERATION PROCEDURE 4-EMERGENCYHEAT MODE PROCEDURE 1-SELF-TESTMODEPROCEDURE 2-HEATINGMODE PROCEDURE 3-HEATING MODE-TWOSTAGEB.Two-SpeedApplications PROCEDURE 5-COOLINGMODEPROCEDURE 6-HEATPUMP MODE A. Single-SpeedApplicationsPROCEDURE 8-COMPONENTTEST PROCEDURE 7-CONTINUOUSFAN MODEB. Two-SpeedApplications PROCEDURE 10-DEHUMIDIFICATIONMODE PROCEDURE 9-BYPASSHUMIDIFIER MODEPROCEDURE 2-SELECTSETUP SWITCH POSITIONS Table 10-BlowerOff Delay Setup Switch SW PositionPROCEDURE 11-ZONEMODE START-UPPROCEDURES PROCEDURE 1-GENERAL1 OFF Fig. 53-Exampleof Setup Switch in OFF PositionFig. 54-InducerHousing Drain Tube C. Setup Switches SWPROCEDURE 4-PURGEGAS LINES Table 11-SetupSwitch DescriptionTable 12-BlowerOff Delay Setup Switch Position PROCEDURE 3-PRIMECONDENSATE TRAP WITH WATERFig. 55-FillingCondensate Trap Sea Level Sea Level CANADA Sea LevelFig. 56-RedundantAutomatic Gas Valve B. Set Temperature RiseFig. 57-BurnerOrifice Table 14-AltitudeDerate Multiplier for U.S.A Fig. 58-BurnerFlameC. Set Thermostat Heat Anticipator A. Check Primary Limit Control PROCEDURE 6-CHECKSAFETY CONTROLSB. Check Pressure Switches Table 15-GasRate Cu Ft/HrFig. 59-AmpDraw Check with Ammeter PROCEDURE 7-CHECKLISTPage Catalog No Book/Tab 1/6