Bryant 315AAV Cooling A/C or Continuous-Fan CF Airflow Selection Chart, Inducer Prepurge Period

Page 52

315AAV

COOLING TONNAGE VS. AIRFLOW (CFM)

AIR CONDITIONING

 

AIRFLOW

 

 

 

 

 

 

 

070 MODEL

 

 

 

 

 

 

 

090 MODEL

 

 

 

110, 135,

TONS (12,000 BTU/HR)

 

 

(CFM)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

& 155 MODELS

1-1/2

 

 

 

525

 

 

 

 

 

 

 

 

 

 

 

 

 

X2

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

700

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

X2

 

 

 

 

 

 

 

 

 

 

 

X

2-1/2

 

 

 

875

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

X2

3

 

 

 

1050

 

 

 

 

 

 

 

 

 

 

 

 

X1

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

X

3-1/2

 

 

 

1225

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

X1

 

 

 

 

 

 

 

 

 

 

 

X

4

 

 

 

1400

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

1750

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

2100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

X-INDICATES AN ALLOWABLE SELECTION.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AIR CONDITIONING (A/C) OR CONTINUOUS-FAN (CF) AIRFLOW SELECTION CHART

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BASED ON 350 CFM/TON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SW1-5 OFF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH SW3 POSITIONS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MODEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIZE

 

 

OFF

 

 

23 1

OFF

 

 

 

23 1

OFF

 

 

23 1

OFF

 

 

23 1

OFF

 

 

 

23 1

 

OFF

 

 

23 1

OFF

 

 

23 1

OFF

 

 

 

23 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

070

 

 

 

DEF

 

 

5252

 

700

 

 

875

 

10501

 

 

1225

 

 

1225

 

 

 

1225

 

 

 

 

 

090

 

 

 

DEF

 

 

525

 

7002

 

875

 

1050

 

 

1225

 

 

14001

 

 

 

1400

 

 

 

 

 

110,135,155

 

DEF

 

 

700

 

8752

 

1050

 

1225

 

 

1400

 

 

17501

 

 

 

2100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BASED ON 400 CFM/TON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SW1-5 ON

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH SW3 POSITIONS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MODEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIZE

 

 

OFF

 

 

23 1

OFF

 

 

 

23 1

OFF

 

 

23 1

OFF

 

 

23 1

OFF

 

 

 

23 1

 

OFF

 

 

23 1

OFF

 

 

23 1

OFF

 

 

 

23 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

070

 

 

 

DEF

 

 

6002

800

 

 

1000

 

12001

 

1400

 

 

1400

 

 

 

1400

 

 

 

 

 

090

 

 

 

DEF

 

 

600

 

8002

 

1000

 

1200

 

 

 

1400

 

 

16001

 

 

 

1600

 

 

 

 

 

110,135,155

 

DEF

 

 

800

 

10002

 

1200

 

1400

 

 

1600

 

 

20001

 

 

 

2200

 

 

 

 

1.DEFAULT A/C AIRFLOW WHEN A/C SWITCHES ARE IN OFF POSITION (FACTORY SETTING) 2.DEFAULT CONT. FAN AIRFLOW WHEN CF SWITCHES ARE IN OFF POSITION (FACTORY SETTING) 3. SWITCH POSITIONS ARE ALSO SHOWN ON FURNACE WIRING DIAGRAM

A08470

Fig. 57 - Cooling (A/C) or Continuous-Fan (CF) Airflow Selection Chart

The furnace will start up in either low- or high-heat. If the furnace starts up in low-heat, the control CPU determines the low-heat on-time (from 0 to 16 minutes) which is permitted before switching to high-heat.

If the power is interrupted, the stored history is erased and the control CPU will select low-heat for up to 16 minutes and then switch to high-heat, as long as the thermostat continues to call for heat. Subsequent selection is based on stored history of the thermostat cycle times.

The wall thermostat “calls for heat”, closing the R-to-W circuit. The furnace control performs a self-check, verifies the low-heat and high-heat pressure switch contacts LPS and HPS are open, and starts the inducer motor IDM in high-speed.

a.Inducer Prepurge Period

(1.) If the furnace control CPU selects low-heat oper- ation the inducer motor IDM comes up to speed, the low-heat pressure switch LPS closes, and the furnace control CPU begins a 15-second prepur- ge period. If the low-heat pressure switch LPS fails to remain closed the inducer motor IDM will remain running at high-speed. After the low-heat pressure switch re-closes the furnace control CPU will begin a 15-second prepurge period, and con-

tinue to run the inducer motor IDM at high- speed.

(2.) If the furnace control CPU selects high-heat op- eration, the inducer motor IDM remains running at high-speed, and the high-heat pressure switch relay HPSR is de-energized to close the NC con- tact. When sufficient pressure is available the high-heat pressure switch HPS closes, and the high-heat gas valve solenoid GV-HI is ener- gized. The furnace control CPU begins a

15-second prepurge period after the low-heat pressure switch LPS closes. If the high-heat pres- sure switch HPS fails to close and the low-heat pressure switch LPS closes, the furnace will oper- ate at low-heat gas flow rate until the high-heat pressure switch closes for a maximum of 2 min- utes after ignition.

b.Igniter Warm-Up-At the end of the prepurge period, the Hot-Surface Igniter HSI is energized for a 17-second igniter warm-up period.

c.Trial-For-Ignition Sequence -When the igniter warm-up period is completed the main gas valve relay contact GVR closes to energize the gas valve solenoid GV-M. The gas valve solenoid GV-M permits gas flow to the burners where it is ignited by the HSI. Five

52

Image 52
Contents Electrostatic Discharge ESD Precautions Furnace Reliability Hazard Safety ConsiderationsCUT Hazard Clearances to Combustibles Introduction Electrostatic Discharge ESD Precautions ProcedureCodes and Standards Dimensional Drawing Dimensions In. mm LocationCarbon Monoxide Poisoning / Component Damage Hazard FIRE, Injury or Death HazardLocation Relative to Cooling Equipment Fire HazardPersonal Injury AND/OR Property Damage Hazard Furnace Corrosion Hazard AIR for Combustion VentilationCarbon Monoxide Poisoning Hazard Air for Combustion, Ventilation, and Dilution for Outdoors Standard MethodInstallation Upflow InstallationCombination of Indoor and Outdoor Air Bottom Return Air InletSuspended Furnace Support Downflow InstallationPlatform Furnace Support Floor and Plenum Opening Dimensions Roll-Out Protection Opening Dimensions In. mm Filter ArrangementAIR Ducts General RequirementsUpflow and Horizontal Furnaces Supply Air ConnectionsDownflow Furnaces Horizontal Unit Suspension Typical Attic Installation Downflow Return Air Configurations and Restrictions Air Delivery CFM With Filter CFMReturn Air Connections GAS Piping Fire or Explosion HazardMaximum Capacity of Pipe Furnace Damage HazardWiring Electrical Connections Electrical Shock HazardElectrical Shock and Fire Hazard Furnace MAY not Operate HazardBox Relocation Electrical DataFire or Electrical Shock Hazard Accessories BX Cable Installation in Furnace J-BoxVenting Field Wiring Diagram General Venting Requirements Two-Stage Furnace with Single-Speed Air ConditionerTwo-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 Additional Venting Requirements Vent HeightUpflow Application Vent Elbow Up Horizontal Left Application Vent Elbow Left Venting Notes for Horizontal Left Application Vent Elbow UpSTART-UP, ADJUSTMENT, and Safety Check Sidewall VentingGeneral Furnace Vent Orientation Furnace Input MIN. VentOrifice Hole Fire and Explosion HazardFurnace Setup Switch Description Setup Switch Switch Name Normal Description of USE PositionAltitude Percent Derate Multiplier Altitude Derate Multiplier for U.S.ADerate Factor Unit Damage Hazard Furnace Overheating Hazard315AAV Wiring Diagram Gas Rate CU ft./hr Seconds G Size of Test DialSpecific Gravity of Natural GAS Altitude Range Range AltitudeBTUH/CU FT Altitude Range BTUH/CUAT Altitude Service and Maintenance Procedures Environmental HazardElectrical SHOCK, Fire or Explosion Hazard Electrical Operation HazardElectrical Controls and Wiring Component Self-TestCare and Maintenance Fire or Explosion Hazard Cleaning and/or Replacing Air FilterMedia cabinet filter procedures Carbon Monoxide Poisoning and Fire HazardCleaning Heat Exchanger Service agencyFilter Size Information In. mm Following steps should be performed by a qualifiedIgniter Position Side View Sequence of Operation Cooling A/C or Continuous-Fan CF Airflow Selection Chart Inducer Prepurge PeriodSingle-Stage Thermostat and Two-Speed Cooling Adaptive Mode Single-Speed CoolingSuper-Dehumidify Mode Thermidistat ModeContinuous Blower Mode Heat pump TroubleshootingComponent test Troubleshooting Guide Adapter Kit Werblo Modelinvalid Orselection Accessory List Description Part NumberParts Replacement Information Guide