Manuals / Bryant / Household Appliance / Furnace

Bryant 355MAV Furnace,Plenum, and Coil Assembly or, Coil Box Installed on a Combustible Floor

Models: 355MAV

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Page 20

Fig. 20—Furnace, Plenum, and Coil Assembly or

FURNACE

CD5 OR CK5

COIL ASSEMBLY

OR KCAKC

COIL BOX

COMBUSTIBLE

FLOORING

SHEET METAL

PLENUM

FLOOR

OPENING

A96284

Fig. 20—Furnace, Plenum, and Coil Assembly or

Coil Box Installed on a Combustible Floor

PERFORATED

DISCHARGE DUCT

FLANGE

NO

YES

210 DEG.

MIN

YES

A93029

Fig. 21—Duct Flanges

CAUTION: The entire length of furnace MUST be supported when furnace is used in a horizontal position to ensure proper draining. When suspended, bottom brace supports sides and center blower shelf. When unit is supported from the ground, blocks or pad should support sides and center blower shelf area.

PROCEDURE 4—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 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.

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.

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Image 20

Bryant 355MAV Furnace,Plenum, and Coil Assembly or, Coil Box Installed on a Combustible Floor, DuctFlanges

Contents

TABLE OF CONTENTS Installation, Start-up,and Operating InstructionsDeluxe 4-WayMultipoise 355MAVGeneral SAFETY CONSIDERATIONS Fig. 1-MultipoiseOrientationsINTRODUCTION CODES AND STANDARDSDimensions in Fig. 2-DimensionalDrawingFig. 3-Clearancesto Combustibles INSTALLATIONFig. 4-CondensateTrap ELECTROSTATIC DISCHARGE ESD PRECAUTION PROCEDUREAPPLICATIONS PROCEDURE 1-GENERAL PROCEDURE 2-UPFLOWAPPLICATIONS Fig. 5-Factory-ShippedUpflow Tube ConfigurationShown with Blower Access Panel Removed h.Attach tube to coupling and clamp securely F. Pressure Switch Tubing PROCEDURE 3-DOWNFLOWAPPLICATIONSFig. 7-DownflowTube Configuration Left-HandTrap InstallationB. Condensate Trap Tubing Fig. 8-DownflowTube ConfigurationRight-HandTrap Installation D. Pressure Switch Tubing C.Condensate Trap Field Drain AttachmentE. Condensate Trap Freeze Protection A. Condensate Trap LocationFig. 9-HorizontalLeft Tube Configuration C. Condensate Trap Field Drain AttachmentsF. Construct a Working Platform D. Pressure Switch TubingB. Condensate Trap Tubing Fig. 10-AtticLocation and Working PlatformA. Condensate Trap Location D. Pressure Switch Tubing Fig. 11-HorizontalRight Tube ConfigurationC. Condensate Trap Field Drain Attachment LOCATION PROCEDURE 1-GENERAL Fig. 13-Return-AirTemperatureFig. 12-FurnaceLocation for Proper Condensate DrainageFig. 15-FreezeProtection Fig. 14-ProhibitInstallation on BackPROCEDURE 2-LOW-FIREONLY INSTALLATION PROCEDURE 4-HAZARDOUSLOCATIONS Fig. 16-Installationin a GarageINSTALLATION PROCEDURE 1-LEVELINGLEGS IF DESIRED 1.Size gas piping based on the high-fireinputTable 1-OpeningDimensions in Fig. 17-LevelingLegson a Combustible Floor Fig. 18-Floorand Plenum Opening DimensionsFig. 19-Furnace,Plenum, and Subbase Installed Fig. 20-Furnace,Plenum, and Coil Assembly or Coil Box Installed on a Combustible FloorPROCEDURE 4-AIRDUCTS A. General Requirements Fig. 21-DuctFlangesFig. 22-CrawlspaceHorizontal Application B. Ductwork Acoustical TreatmentC. Supply Air Connections UPFLOW FURNACESPROCEDURE 5-FILTERARRANGEMENT Fig. 23-FilterInstalled for Side InletPROCEDURE 6-BOTTOMCLOSURE PANEL PROCEDURE 7-GASPIPING171⁄2-IN.WIDE CASINGS ONLY Fig. 24-BottomFilter ArrangementFig. 25-RemovingBottom Closure Panel Table 3-MaximumCapacity of Pipe Fig. 26-TypicalGas Pipe ArrangementPROCEDURE 8-ELECTRICALCONNECTIONS A. 115-VWiringFig. 28-DisconnectSwitch and Furnace B. 24-VWiringC.Accessories Table 4-ElectricalDataPROCEDURE 9-DIRECTVENTING Fig. 29-Relocating J-BoxFig. 30-UnitWiring Diagram Fig. 31-ControlCenter Fig. 32-EACTerminals on Control CenterB. Combustion-Airand Vent Piping GENERALFig. 34-ThermidistatConnection Fig. 33-355MAVVariable Speed Furnace ControlPage Fig. 36-Combustion-Airand Vent Pipe Connections Fig. 37-ShortVent 5 to 8 ft System COMBUSTION-AIRAND VENT PIPE DIAMETERTable 7-MaximumAllowable Pipe Length ft COMBUSTION-AIRAND VENT PIPE ATTACHMENTTable 7-MaximumAllowable Pipe Length ft Continued Fig. 38-IntakeHousing Plug Fitting Drain Table 7-MaximumAllowable Pipe Length ft ContinuedFig. 39-RoofTermination Preferred Fig. 42-SidewallTermination of 12 in. or More Fig. 43-SidewallTermination of Less than 12 in EXTENDED EXPOSED SIDEWALL PIPESTWO-PIPETERMINATION KIT CONCENTRIC VENT/AIR TERMINATION KITD. Multiventing and Vent Terminations PROCEDURE 10-CONDENSATEDRAIN A. GeneralAmbient B. Application C. Condensation Drain ProtectionFig. 47-SidewallTermination of 12 in. or Less Fig. 48-SidewallTermination of More than 12 inSEQUENCE OF OPERATION Fig. 49-Exampleof Field Drain AttachmentFig. 50-CondensateTrap Heat Tape PROCEDURE 1-SELF-TESTMODE PROCEDURE 2-HEATINGMODEPROCEDURE 3-HEATING MODE-TWOSTAGE PROCEDURE 4-EMERGENCYHEAT MODEPROCEDURE 5-COOLINGMODE PROCEDURE 6-HEATPUMP MODEA. Single-SpeedApplications B.Two-SpeedApplicationsB. Two-SpeedApplications PROCEDURE 7-CONTINUOUSFAN MODEPROCEDURE 8-COMPONENTTEST PROCEDURE 9-BYPASSHUMIDIFIER MODE PROCEDURE 10-DEHUMIDIFICATIONMODETable 10-BlowerOff Delay Setup Switch SW Position PROCEDURE 11-ZONEMODESTART-UPPROCEDURES PROCEDURE 1-GENERAL PROCEDURE 2-SELECTSETUP SWITCH POSITIONSFig. 53-Exampleof Setup Switch in OFF Position Fig. 54-InducerHousing Drain TubeC. Setup Switches SW 1 OFFTable 11-SetupSwitch Description Table 12-BlowerOff Delay Setup Switch PositionPROCEDURE 3-PRIMECONDENSATE TRAP WITH WATER PROCEDURE 4-PURGEGAS LINESFig. 55-FillingCondensate Trap Sea Level Sea Level Sea Level CANADAFig. 57-BurnerOrifice B. Set Temperature RiseFig. 56-RedundantAutomatic Gas Valve C. Set Thermostat Heat Anticipator Fig. 58-BurnerFlameTable 14-AltitudeDerate Multiplier for U.S.A PROCEDURE 6-CHECKSAFETY CONTROLS B. Check Pressure SwitchesTable 15-GasRate Cu Ft/Hr A. Check Primary Limit ControlPROCEDURE 7-CHECKLIST Fig. 59-AmpDraw Check with AmmeterPage Book/Tab 1/6 Catalog No