Bryant 345MAV → ÐInducer Housing Drain Tube, III. Purge GAS Lines, IV. Adjustments

Page 33

A99118

→Fig. 38ÐInducer Housing Drain Tube

5.Remove funnel and tube from inducer housing and replace drain connection cap and clamp.

III.PURGE GAS LINES

If not previously done, purge lines after all connections have been made and check for leaks.

WARNING: Never purge a gas line into a combustion chamber. Never use matches, candles, flame, or other sources of ignition for purpose of checking leakage. Use a soap-and-water solution to check for leakage. Failure to follow this warning could result in fire, explosion, per- sonal injury, or death.

IV. ADJUSTMENTS

A.Set Gas Input Rate

Furnace gas input rate on rating plate is for installations at altitudes up to 2000 ft. Furnace input rate must be within ±2 percent of input on furnace rating plate.

1.Determine natural gas orifice size and manifold pressure for correct input.

a.Obtain average yearly heat value (at installed altitude) from local gas supplier.

b.Obtain average yearly specific gravity from local gas supplier.

c.Verify furnace model. Table 7 can only be used for model 345MAV furnaces.

A99119

→ Fig. 39ÐFilling Condensate Trap

d.Find installation altitude in Table 7.

NOTE: For Canada altitudes of 2000 to 4500 ft, use U.S.A. altitudes of 5001 to 6000 ft in Table 7.

e.Find closest natural gas heat value and specific gravity on Table 7.

f.Follow heat value and specific gravity lines to point of intersection to find orifice size and manifold pressure settings for proper operation.

EXAMPLE: (0Ð2000 altitude)

Heating value = 1050 Btu/cu ft

Specific gravity = 0.62

Therefore: Orifice No. 45

Manifold pressure 3.6-in. wc

*Furnace is shipped with No. 45 orifices. In this example all main burner orifices are the correct size and do not need to be changed to obtain the proper input rate.

Check and verify burner orifice size in furnace. NEVER ASSUME ORIFICE SIZE; ALWAYS CHECK AND VERIFY.

2. Adjust manifold pressure to obtain input rate.

NOTE: Manifold pressure must always be measured with burner enclosure front REMOVED. Gas meter must always be clocked with burner enclosure front INSTALLED.

a. Remove burner enclosure front.

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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 Ð5ÐPressure Switch Tubing Ð6ÐCondensate Trap Field Drain Attachment III. Downflow Applications Condensate Trap Freeze ProtectionCondensate Trap Location Condensate Trap TubingÐ8Ð 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 AIR for Combustion and Ventilation General III. Hazardous LocationsII. Unconfined Space III. Confined 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 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 PipingÐmaximum Capacity of Pipe CU FT PER HR Electrical ConnectionsNominal Length of Pipe FT Iron Internal Diameter Size Length FT³ CKT BKR Amps Phase WiringÐelectrical Data Amps SizeÐWiring Diagram III. Accessories II -V WiringVenting Removal of Existing Furnaces from Common Vent SystemsII. COMBUSTION-AIR and Vent Piping GeneralCombustion Air Pipe ÐCombustion-Air Inlet Pipe Assembly Ðmaximum Allowable Vent Pipe Length FT 3001 to4001 to 5000² 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 8001Ðaltitude Derate Multiplier for U.S.A ExampleAltitude Derate Multiplier Factor for U.S.A Blower Off Delay Heat Mode Set Temperature RiseÐgas Rate CU FT/HR ±SPEED SelectorCheck Safety Controls Check Primary Limit Control II. Check Pressure SwitchChecklist 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.

One standout feature of the Bryant 345MAV is its impressive energy efficiency. With a high SEER (Seasonal Energy Efficiency Ratio) rating, it operates at peak levels while consuming less energy. This not only reduces utility bills but also supports environmental sustainability, making it an ideal selection for eco-conscious consumers. The model employs variable-speed technology, which allows the system to adjust its output based on current heating and cooling needs. As a result, it provides consistent indoor comfort while minimizing temperature fluctuations.

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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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