Bryant 345MAV Check Safety Controls Check Primary Limit Control, II. Check Pressure Switch

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CHECK SAFETY CONTROLS

I.CHECK PRIMARY LIMIT CONTROL

This control shuts off combustion control system and energizes air-circulating blower motor if furnace overheats. Recommended method of checking this limit control is to gradually block off return air after furnace has been operating for a period of at least 5 minutes. As soon as limit control has shut off burners, return-air opening should be unblocked to permit normal air circulation. By using this method to check limit control, it can be established that limit is functioning properly and operates if there is a restricted return-air supply or motor failure. If limit control does not function during this test, cause must be determined and corrected.

II.CHECK PRESSURE SWITCH

This control proves operation of draft inducer. Check switch operation as follows:

1.Turn off 115-v power to furnace.

2.Remove main furnace door and disconnect inducer motor lead wires from wire harness.

3.Turn on 115-v power to furnace.

4.Set thermostat to "call for heat" and wait 1 minute. When pressure switch is functioning properly, hot surface ignitor should NOT glow, and control center diagnostic light

flashes a 31 fault. If hot surface ignitor glows when inducer motor is disconnected, shut furnace down immediately. Determine reason pressure switch did not function properly and correct condition.

5.Turn off 115-v power to furnace.

6.Reconnect inducer motor leads, reinstall main furnace door, and turn on 115-v power supply.

CHECKLIST

1.Put away tools and instruments. Clean up debris.

2.Verify manual reset switch has continuity.

3.Verify that blower and control access doors are properly installed.

4.Cycle test furnace with room thermostat.

5.Check operation of accessories per manufacturer's instruc- tions.

6.Review User's Guide with owner.

7.Leave literature packet near furnace.

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Contents Ð1Ð Electrostatic Discharge ESD PrecautionsUnit Size Dimensions→ ÐDimensional Drawing Ð2Ð→ ÐClearances to Combustibles Safety ConsiderationsElectrostatic Discharge ESD Precautions Minimum Inches Clearance to Combustible ConstructionCondensate Trap Location Factory-Shipped Orientation IntroductionApplications General II. Upflow ApplicationsCondensate Trap Location Alternate Upflow Orientation Ð5ÐPressure Switch Tubing Ð6ÐCondensate Trap Field Drain Attachment Condensate Trap Tubing Condensate Trap Freeze ProtectionIII. Downflow Applications Condensate Trap LocationÐ8Ð IV. Horizontal Left SUPPLY-AIR Discharge ApplicationsHorizontal Right SUPPLY-AIR Discharge Applications Construct a Working PlatformÐ9Ð ÐAttic Location and Working Platform Front Upflow or Downflow Horizontal II. Furnace Location Relative to Cooling Equipment III. Confined Space III. Hazardous LocationsAIR for Combustion and Ventilation General II. Unconfined SpaceInstallation Leveling Legs if Desired Combustion AIR from Outdoors Through Vertical DuctsCombustion AIR from Outdoors Through Horizontal Ducts II. Installation on a Concrete Slab Opening DimensionsFurnace Casing Width Ductwork acoustical treatment IV. Installation in Horizontal ApplicationsAIR Ducts General RequirementsVII. Bottom Closure Panel Return Air ConnectionsVI. Filter Arrangement Ðfilter Information171⁄2-IN. Wide Casings only VIII. GAS PipingÐmaximum Capacity of Pipe CU FT PER HR Electrical ConnectionsNominal Length of Pipe FT Iron Internal Diameter Size Amps Size WiringLength FT³ CKT BKR Amps Phase Ðelectrical DataÐWiring Diagram Removal of Existing Furnaces from Common Vent Systems II -V WiringIII. Accessories VentingII. COMBUSTION-AIR and Vent Piping GeneralCombustion Air Pipe ÐCombustion-Air Inlet Pipe Assembly Ðmaximum Allowable Vent Pipe Length FT 3001 to4001 to 5000² 7001 to 8000² Ðmaximum Allowable Vent Pipe Length FT5001 to 6000² 6001 to 7000²9001 to 10,000² ÐShort Vent 5 to 8 Ft System040 060 080 100 120 Vent Extension PipeÐvent Pipe Termination Clearances III. Vent TerminationIV. Multiventing Condensate Drain GeneralÐRoof Termination Preferred IV. Heat Pump Mode Heating ModeII. Cooling Mode III. Continuous Blower ModeII. Prime Condensate Trap with Water START-UP Procedures GeneralComponent Test Component Test SequenceSet Gas Input Rate → ÐInducer Housing Drain TubeIV. Adjustments III. Purge GAS LinesAltitude BTU/CU FTOnly 5001 Only4001 5000Only 8001 7001775 8000Ðaltitude Derate Multiplier for U.S.A ExampleAltitude Derate Multiplier Factor for U.S.A ±SPEED Selector Set Temperature RiseBlower Off Delay Heat Mode Ðgas Rate CU FT/HRCheck Safety Controls Check Primary Limit Control II. Check Pressure SwitchChecklist Vent Piping ChecklistðinstallationCHECKLISTÐSTART-UP Load Calculation
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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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Comfort also extends to the user experience with the inclusion of a smart thermostat option. This integration allows homeowners to manage their heating and cooling systems remotely, enhancing convenience and control. Programmable settings can optimize energy use based on individual schedules, facilitating both comfort and savings.

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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