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Bryant 345MAV instruction manual Ii.Furnace Location Relative To Cooling Equipment

Models: 345MAV

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II.FURNACE LOCATION RELATIVE TO COOLING EQUIPMENT

FRONT

°F °F

RETURN

AIR

MAX 85°F MIN 55°F

A93042

NOTE: These furnaces are designed for a minimum continuous return-air temperature of 60°F or intermittent operation down to 55°F such as when used with a night setback thermostat. Return-air temperature must not exceed a maximum of 85°F. Failure to follow these return-air temperature limits may affect reliability of heat exchangers, motors, and controls.

32°F MINIMUM INSTALLED AMBIENT OR FREEZE PROTECTION REQUIRED

A93058

CAUTION: If these furnaces are installed in an uncon- ditioned space where ambient temperatures may be 32°F or lower, freeze protection measures must be taken.

FRONT

BACK

FRONT

B

A

C

K

A93043

II.FURNACE LOCATION RELATIVE TO COOLING EQUIPMENT

The cooling coil must be installed parallel with or on downstream side of furnace to avoid condensation in heat exchanger. When installed parallel with a furnace, dampers or other means used to control flow of air must prevent chilled air from entering furnace. If dampers are manually operated, they must be equipped with a means to prevent operation of either unit unless damper is in full-heat or full-cool position.

WARNING: Do not install furnace on its back. Safety control operation will be adversely affected. Never con- nect return-air ducts to back of furnace. Failure to follow this warning could result in fire, personal injury, or death.

CAUTION: Do not use this furnace during construction when adhesives, sealers, and/or new carpets are being installed and curing. If the furnace is required during construction, use clean outside air for combustion and ventilation. Compounds of chlorine and fluorine, when burned with combustion air, form acids which will cause corrosion of heat exchangers. Some of these compounds are released from paneling and dry wall adhesives, paints, thinners, masonry cleaning materials, and many other solvents commonly used in the construction process.

Excessive exposure to contaminated combustion air will result in safety and performance related problems.

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Bryant 345MAV instruction manual Ii.Furnace Location Relative To Cooling Equipment

Contents

Fig. 1ÐMultipoise Orientations installation, start-upand operating instructions 345MAVDIMENSIONS IN →Fig. 2ÐDimensional DrawingSAFETY CONSIDERATIONS ELECTROSTATIC DISCHARGE ESD PRECAUTIONS→Fig. 3ÐClearances to Combustibles INSTALLATIONINTRODUCTION APPLICATIONS I.GENERALII.UPFLOW APPLICATIONS Fig. 4ÐCondensate Trap Fig. 5ÐFactory-ShippedUpflow Tube Configuration Shown With Blower Access Panel RemovedFig. 6ÐAlternate Upflow Tube Configuration and F. Pressure Switch TubingFig. 7ÐDownflow Tube Configuration Left-HandTrap InstallationFig. 8ÐDownflow Tube Configuration Right-HandTrap InstallationD.Pressure Switch Tubing C.Condensate Trap Field Drain AttachmentE. Condensate Trap Freeze Protection A.Condensate Trap LocationFig. 9ÐHorizontal Left Tube Configuration E.Condensate Trap Freeze ProtectionF.Construct a Working Platform D.Pressure Switch TubingD. Pressure Switch Tubing Fig. 10ÐAttic Location and Working PlatformB.Condensate Trap Tubing C.Condensate Trap Field Drain AttachmentÐ11Ð II.FURNACE LOCATION RELATIVE TO COOLING EQUIPMENT III.HAZARDOUS LOCATIONS AIR FOR COMBUSTION AND VENTILATION I.GENERALII.UNCONFINED SPACE III.CONFINED SPACEINSTALLATION I.LEVELING LEGS IF DESIRED Fig. 12ÐConfined Space: Air for Combustion andVentilation from an Unconfined Space Fig. 13ÐConfined Space: Air for Combustion andII.INSTALLATION ON A CONCRETE SLAB OPENING DIMENSIONS INNon-GarageInstallation Fig. 14ÐLeveling LegsIV. INSTALLATION IN HORIZONTAL APPLICATIONS V.AIR DUCTS A.General RequirementsFig. 17ÐDuct Flanges B.Ductwork acoustical treatmentD.Return Air Connections VI. FILTER ARRANGEMENTTABLE 1ÐFILTER INFORMATION VII. BOTTOM CLOSURE PANELFig. 20ÐFilter Installed for Side Inlet Fig. 22ÐRemoving Bottom Closure PanelVIII. GAS PIPING Fig. 21ÐBottom Filter ArrangementTABLE 2ÐMAXIMUM CAPACITY OF PIPE CU FT PER HR Fig. 23ÐTypical Gas Pipe ArrangementELECTRICAL CONNECTIONS I.115-VWIRING TABLE 3ÐELECTRICAL DATAJ-BOXRELOCATION Fig. 25ÐRelocating J-BoxFig. 26ÐWiring Diagram Ð21ÐII.24-VWIRING III.ACCESSORIESVENTING Fig. 27ÐControl CenterII.COMBUSTION-AIRAND VENT PIPING A.General B. Combustion Air PipeFig. 28ÐCombustion-Airand Vent Pipe Connections COMBUSTION-AIRINLET PIPE ASSEMBLY IN Fig. 29ÐCombustion-AirInlet Pipe AssemblyElbow Configuration Fig. 30ÐIntake Housing Plug Fitting DrainTABLE 4ÐMAXIMUM ALLOWABLE VENT PIPE LENGTH FT Ð25ÐÐ26Ð Fig. 32ÐShort Vent 5 to 8 Ft System Ð27ÐWINTER DESIGN TEMPERATURE AMBIENT D.Extended Exposed Sidewall Pipes III.VENT TERMINATIONIV. MULTIVENTING CONDENSATE DRAIN I.GENERALFig. 33ÐRoof Termination Preferred Fig. 35ÐSidewall Termination with Straight PipeFig. 36ÐExample of Field Drain Attachment Ð30ÐI.HEATING MODE II.COOLING MODEIII.CONTINUOUS BLOWER MODE IV. HEAT PUMP MODESTART-UPPROCEDURES I.GENERAL V.COMPONENT TEST A.Component Test SequenceII.PRIME CONDENSATE TRAP WITH WATER →Fig. 38ÐInducer Housing Drain Tube IV. ADJUSTMENTS A.Set Gas Input RateIII.PURGE GAS LINES → Fig. 39ÐFilling Condensate TrapÐ34Ð Continued Continued Ð36ÐFig. 40ÐRedundant Automatic Gas Valve UNITED STATESFig. 41ÐBurner Flame TABLE 8ÐALTITUDE DERATE MULTIPLIER FOR U.S.AB.Set Temperature Rise C.Blower Off Delay Heat ModeTABLE 9ÐGAS RATE CU FT/HR TABLE 10±SPEED SELECTORCHECK SAFETY CONTROLS II.CHECK PRESSURE SWITCHCHECKLIST I.CHECK PRIMARY LIMIT CONTROLCHECKLISTÐINSTALLATION Ð40Ð