Bryant 315AAV Return Air Connections, GAS Piping Fire or Explosion Hazard, Furnace Damage Hazard

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Return Air Connections

!WARNING

FIRE HAZARD

A failure to follow this warning could cause personal injury, death and/or property damage.

Never connect return-air ducts to the back of the furnace. Follow instructions below.

Downflow Furnaces

The return-air duct must be connected to return-air opening (bottom inlet) as shown in Fig. 3. DO NOT cut into casing sides (left or right). Side opening is permitted for only upflow and certain horizontal furnaces. Bypass humidifier connections should be made at ductwork or coil casing sides exterior to furnace. (See Fig. 19.)

Upflow and Horizontal Furnaces

The return-air duct must be connected to bottom, sides (left or right), or a combination of bottom and side(s) of main furnace casing as shown in Fig. 3. Bypass humidifier may be attached into unused return air side of the furnace casing. (See Fig. 18 and 20.) Not all horizontal furnace models are approved for side return air connections. (See Fig. 20.)

GAS PIPING

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections.

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Use proper length of pipe to avoid stress on gas control manifold and a gas leak.

!WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in personal injury, death, and/or property damage.

Gas valve inlet and/or inlet pipe must remain capped until gas supply line is permanently installed to protect the valve from moisture and debris. Also, install a sediment trap in the gas supply piping at the inlet to the gas valve.

Gas piping must be installed in accordance with national and local codes. Refer to current edition of NFGC in the U.S.

Installations must be made in accordance with all authorities having jurisdiction. If possible, the gas supply line should be a separate line running directly from meter to furnace.

NOTE: In the state of Massachusetts:

1.Gas supply connections MUST be performed by a li- censed plumber or gas fitter.

2.When flexible connectors are used, the maximum length shall not exceed 36 in. (915 mm).

3.When lever handle type manual equipment shutoff valves are used, they shall be T-handle valves.

4.The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.

Refer to Table 6 for recommended gas pipe sizing. Risers must be used to connect to furnace and to meter. Support all gas piping with appropriate straps, hangers, etc. Use a minimum of 1 hanger every 6 ft. (1.8 M). Joint compound (pipe dope) should be applied sparingly and only to male threads of joints. Pipe dope must be resistant to the action of propane gas.

Table 6 – Maximum Capacity of Pipe

NOMINAL

INTERNAL

 

LENGTH OF PIPE --- FT (M)

 

IRON PIPE

 

 

 

 

 

SIZE

DIA.

10

20

30

40

50

IN. (MM)

IN. (MM)

(3.0)

(6.0)

(9.1)

(12.1)

(15.2)

 

 

 

 

 

 

 

1/2 (12.7)

0.622(158)

175

120

97

82

73

 

 

 

 

 

 

 

3/4 (19.0)

0.824 (20.9)

360

250

200

170

151

 

 

 

 

 

 

 

1 ( 25.4)

1.049 (26.6)

680

465

375

320

285

 

 

 

 

 

 

 

1-1/4

1.380 (35.0)

1400

950

770

660

580

(31.8)

 

 

 

 

 

 

1-1/2

1.610 (40.9)

2100

1460

1180

990

900

(38.1)

 

 

 

 

 

 

 

 

 

 

 

 

 

*Cubic ft of gas per hr for gas pressures of 0.5 psig (14--- In. W.C.) or less and a pressure drop of 0.5--- In. W.C. (based on a 0.60 specific gravity gas). Ref: Table 6 and 9.2 NFGC.

!WARNING

FIRE OR EXPLOSION HAZARD

A failure to follow this warning could result in personal injury, death, and/or property damage.

If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector which has previously served another gas appliance. Black iron pipe shall be installed at the furnace gas control valve and extend a minimum of 2-in. (51 mm) outside the furnace.

!CAUTION

FURNACE DAMAGE HAZARD

Failure to follow this caution may result in furnace damage.

Connect gas pipe to furnace using a backup wrench to avoid damaging gas controls and burner misalignment.

An accessible manual equipment shutoff valve MUST be installed external to furnace casing and within 6 ft. (1.8 M) of furnace. A 1/8-in. (3 mm) NPT plugged tapping, accessible for test gauge connection, MUST be installed immediately upstream of gas supply connection to furnace and downstream of manual equipment shutoff valve.

NOTE: The furnace gas control valve inlet pressure tap connection is suitable to use as test gauge connection providing test pressure DOES NOT exceed maximum 0.5 psig (14-In. W.C.) stated on gas control valve. (See Fig. 50.)

Some installations require gas entry on right side of furnace (as viewed in upflow). (See Fig. 21.)

Install a sediment trap in riser leading to furnace as shown in Fig. 22. Connect a capped nipple into lower end of tee. Capped nipple

315AAV

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Contents Electrostatic Discharge ESD Precautions Furnace Reliability Hazard Safety ConsiderationsCUT Hazard Clearances to Combustibles Introduction Electrostatic Discharge ESD Precautions ProcedureCodes and Standards Location Dimensional Drawing Dimensions In. mmFIRE, Injury or Death Hazard Carbon Monoxide Poisoning / Component Damage HazardLocation Relative to Cooling Equipment Fire HazardPersonal Injury AND/OR Property Damage Hazard Furnace Corrosion Hazard AIR for Combustion VentilationCarbon Monoxide Poisoning Hazard Standard Method Air for Combustion, Ventilation, and Dilution for OutdoorsBottom Return Air Inlet InstallationUpflow Installation Combination of Indoor and Outdoor AirSuspended Furnace Support Downflow InstallationPlatform Furnace Support Floor and Plenum Opening Dimensions Roll-Out Protection General Requirements Opening Dimensions In. mmFilter Arrangement AIR DuctsUpflow and Horizontal Furnaces Supply Air ConnectionsDownflow Furnaces Horizontal Unit Suspension Typical Attic Installation Downflow Return Air Configurations and Restrictions CFM Air Delivery CFM With FilterFurnace Damage Hazard Return Air ConnectionsGAS Piping Fire or Explosion Hazard Maximum Capacity of PipeFurnace MAY not Operate Hazard WiringElectrical Connections Electrical Shock Hazard Electrical Shock and Fire HazardBox Relocation Electrical DataFire or Electrical Shock Hazard Accessories BX Cable Installation in Furnace J-BoxVenting Field Wiring Diagram Two-Stage Furnace with Single-Speed Air Conditioner General Venting RequirementsTwo-Stage Furnace with Two-Speed Air Condi Tioner See notes 1 and 2 on the page following these figures 315AAV Chimney Inspection Chart Appliance Application Requirements Masonry Chimney RequirementBurn Hazard Vent Height Additional Venting RequirementsUpflow Application Vent Elbow Up Horizontal Left Application Vent Elbow Left Horizontal Left Application Vent Elbow Up Venting Notes forFurnace Vent Orientation Furnace Input MIN. Vent START-UP, ADJUSTMENT, and Safety CheckSidewall Venting GeneralFire and Explosion Hazard Orifice HoleSetup Switch Switch Name Normal Description of USE Position Furnace Setup Switch DescriptionAltitude Percent Derate Multiplier Altitude Derate Multiplier for U.S.ADerate Factor Furnace Overheating Hazard Unit Damage Hazard315AAV Wiring Diagram Seconds G Size of Test Dial Gas Rate CU ft./hrSpecific Gravity of Natural GAS Altitude Range Range AltitudeBTUH/CU FT BTUH/CU Altitude RangeAT Altitude Electrical Operation Hazard Service and Maintenance ProceduresEnvironmental Hazard Electrical SHOCK, Fire or Explosion HazardComponent Self-Test Electrical Controls and WiringCarbon Monoxide Poisoning and Fire Hazard Care and Maintenance Fire or Explosion HazardCleaning and/or Replacing Air Filter Media cabinet filter proceduresFollowing steps should be performed by a qualified Cleaning Heat ExchangerService agency Filter Size Information In. mmIgniter Position Side View Sequence of Operation Inducer Prepurge Period Cooling A/C or Continuous-Fan CF Airflow Selection ChartSingle-Speed Cooling Single-Stage Thermostat and Two-Speed Cooling Adaptive ModeSuper-Dehumidify Mode Thermidistat ModeContinuous Blower Mode Heat pump TroubleshootingComponent test Troubleshooting Guide Adapter Kit Werblo Modelinvalid Orselection Description Part Number Accessory ListParts Replacement Information Guide
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