Bryant 355M-40-5 ÐWiring Schematic for 2-Speed Cooling Applications, VII. Continuous FAN Mode

Page 33

2-SPEED

VARIABLE

2-SPEED AIR

 

SPEED

THERMOSTAT

THERMOSTAT

CONDITIONER

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

R

 

 

 

R

 

C

 

 

 

C

 

 

 

C

 

G

 

 

 

G

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

W2

 

 

 

W/W1

 

 

 

 

W2

 

 

 

 

 

 

 

 

 

 

 

 

Y2

 

 

 

Y/Y2

 

 

 

 

Y2

 

E

 

 

 

 

 

 

 

 

W3

 

 

 

 

 

 

 

 

 

 

L

 

 

 

 

 

 

 

 

L

 

Y1

 

 

 

 

 

 

 

 

Y1

 

 

 

 

 

 

 

 

 

 

 

A94302

Fig. 43ÐWiring Schematic for 2-Speed

Cooling Applications

2.HumidifierÐThe HUM terminal is energized after inducer prepurge period is completed.

3.Ignitor warm upÐAfter prepurge period, HSI is energized for 17 sec.

4.Ignition sequenceÐAfter HSI warm-up period is com- pleted, the gas valve is energized, permitting gas flow to the burners where it is ignited. After 5 sec, the HSI is de-energized, and a 2-sec flame-sensing period begins.

5.Flame sensingÐWhen burner flame is sensed, control center holds gas valve open.

If burner flame is not sensed, control center de-energizes gas valve, and ignition sequence is repeated.

6.Blower off periodÐTen sec after gas valve is energized, the blower stops for 25 sec to allow heat exchangers to warm up.

7.Blower on delayÐAfter blower off period, blower starts.

NOTE: The blower starts at approximately 400-500 RPM. After 20 sec, the motor is turned off for 1/10 of a sec where a coast down calibration is done to evaluate resistance of the conditioned air duct system. The microprocessor then determines blower RPM required to provide proper airflow for heating mode.

8.Electronic Air CleanerÐThe EAC-1 terminal is energized whenever blower operates.

9.Inducer speed operationÐIf cycle starts in low heat, inducer speed reduces slightly after the flame sense. If cycle starts in high heat, inducer speed increases 15 sec after flame sense. The reduction in speed in low heat is to optimize combustion for maximum efficiency.

10.Call for heat terminatedÐWhen the call for heat is satisfied, the R-W/W1 signal is terminated, de-energizing gas valve (stopping gas flow to burners), and HUM terminal is de-energized.

a.R-W/W1 signal terminated with R-Y/Y2 and R-G still presentÐThe blower changes its speed to cooling RPM.

Ð33Ð

b.R-W/W1 with R-Y/Y2 and R-G signals terminatedÐ The blower continues to operate completing a normal blower off delay.

11.Post purgeÐThe inducer continues operating for 15 sec after gas valve is de-energized.

B.Two-Speed Applications

For details on 2-speed heat pump applications, refer to Fig. 44.

2-SPEED

VARIABLE

2-SPEED

SPEED

THERMOSTAT

THERMOSTAT

HEAT PUMP

R

R

R

C

C

C

G

G

 

W2

W/W1

W2

Y2

Y/Y2

Y2

E

 

W3

L

 

L

O

 

O

Y1

 

Y1

A94303

Fig. 44ÐWiring Schematic for 2-Speed

Heat Pump Applications

VII. CONTINUOUS FAN MODE

1.Operating with continuous fan onlyÐ

a.Call for continuous fanÐThe thermostat closes R-G circuit.

b.Blower onÐThe blower starts immediately.

NOTE: The blower starts at approximately 400-500 RPM. After 20 sec, the motor is turned off for 1/10 of a sec where a coast down calibration is done to evaluate resistance of the conditioned air duct system. The microprocessor then determines blower RPM required to provide proper airflow for heating mode.

NOTE: The continuous fan speed is the same as low-heat speed unless it is field adjusted to another desired airflow. See Continu- ous Fan Setup Switches section. There is also a chart on wiring diagram. (See Fig. 24.)

c.Electronic Air CleanerÐThe EAC-1 terminal is ener- gized whenever blower operates, regardless of operating mode.

2.Operating with continuous fan (R-G) and call for heat (R-W/W1) is receivedÐSame as heat pump mode except blower on delay is 10 sec less than heat mode. After call for heat (R-W/W1) is terminated, the blower remains operating at low-heat speed for selected blower off delay before resuming continuous fan speed.

3.Operating with continuous fan (R-G) and call for cool- ing (R-Y/Y2) is receivedÐSee Cooling Mode section. After call for cooling (R-Y/Y2) is terminated, the blower remains operating at cooling speed for 90 sec before resuming continuous fan speed.

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Contents ÐMultipoise Orientations Ð1ÐDimensions Ð2ÐUnit Size Electrostatic 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 Condensate Trap Location III. Downflow ApplicationsCondensate Trap Tubing Ð7ÐIV. Horizontal Left SUPPLY-AIR Discharge Applications Ð8ÐConstruct a Working Platform Horizontal Right SUPPLY-AIR Discharge ApplicationsÐ9Ð ÐAttic Location and Working Platform Condensate Trap Tubing Location General ÐHorizontal Right Tube ConfigurationIII. Furnace Location Relative to Cooling Equipment II. LOW-FIRE only InstallationInstallation Leveling Legs if Desired II. Installation in Upflow or Downflow ApplicationsIV. Hazardous Locations Ðopening Dimensions Furnace Plenum Opening Floor Opening CasingWidth ÐDuct Flanges III. Installation in Horizontal ApplicationsÐfilter Information IV. Filter ArrangementBottom Closure Panel → ÐBottom Filter ArrangementVI. GAS Piping WiringÐmaximum Capacity of Pipe Electrical ConnectionsII -V Wiring → ÐHeating and Cooling Application Wiring DiagramÐWiring Diagram III. Accessories Ðelectrical DataAmps Size Removal of Existing Furnaces from Common Vent Systems Direct VentingNgpic II. COMBUSTION-AIR and Vent PipingCombustion-Air and Vent Pipe Diameter ÐCOMBUSTION-AIR and Vent Pipe Termination ClearancesLocation Clearance FT Or doors which can be opened or Combustion-air openingCombustion-Air and Vent Pipe Attachment Example2001 to Ðmaximum Allowable Pipe Length FT3001 to 4001 to 5000³6001 to 7000³ Ðmaximum Allowable Pipe Length FT7001 to 8000³ 8001 to 9000³COMBUSTION-AIR Intake Housing Plug Fitting Termination KIT InstallationIII. Concentric Vent and COMBUSTION-AIR ÐRoof Termination Preferred Two-Pipe Termination Kit Extended Exposed Sidewall PipesConcentric Vent/Air Termination Kit 042040 042060 042080 060080 060100 060120Condensate Drain General IV. Multiventing and Vent TerminationsII. Application III. Condensate Drain ProtectionÐConcentric Vent and Combustion-Air Roof II. Heating Mode SELF-TEST ModeSequence of Operation HSICooling Mode IV. Emergency Heat ModeVI. Heat Pump Mode III. Heating Modeðtwo StageVII. Continuous FAN Mode ÐWiring Schematic for 2-Speed Cooling ApplicationsDehumidification Mode IX. Bypass Humidifier ModeXI. Zone Mode START-UP Procedures GeneralÐcontinuous FAN CF Airflow Setup Switch Position Ðair Conditioning A/C Airflow Setup Switch PositionSetup Switches SW III. Prime Condensate Trap with WaterÐblower OFF Delay Setup Switch Position Ðsetup Switch DescriptionIV. Purge GAS Lines AdjustmentsSet Gas Input Rate → ÐRedundant Automatic Gas ValveBTU/CU FT 4001 Only875 1.5 5000775 1.5 70018000 825Canada Ðaltitude Derate Multiplier for U.S.ASume the Orifice SIZE. Always Check and Verify Altitude Derate Multiplier Factor for U.S.ACheck Safety Controls Check Primary Limit Control Set Temperature RiseÐgas Rate CU FT/HR Set Thermostat Heat AnticipatorChecklist II. Check Pressure SwitchesCHECKLISTÐSTART-UP ChecklistðinstallationLoad Calculation Combustion and Vent Piping

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