Bryant 355MAV Procedure 9-BYPASS Humidifier Mode, Procedure 10-DEHUMIDIFICATION Mode

Page 47

 

 

 

 

 

 

 

VARIABLE-SPEED

 

THERMIDISTAT™

 

 

CONDENSING

 

CONTROL

 

 

 

 

FURNACE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RVS COOLING

 

O/W2

 

 

 

 

 

 

W2

 

 

 

 

HEAT/COOL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STAGE 1

 

Y1/W2

 

 

 

 

 

 

 

 

 

 

 

 

(COMPRESSOR LO)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEAT STAGE 3

 

W/W1

 

 

 

 

 

W/W1

 

 

 

 

 

(FURNACE)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEAT/COOL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STAGE 2

 

Y/Y2

 

 

 

 

 

Y/Y2

 

 

 

 

(COMPRESSOR HI)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FAN

 

 

G

 

 

 

 

 

 

G

 

 

 

 

24 VAC HOT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R

 

 

 

 

 

 

R

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DEHUM

 

 

 

DEHUMIDIFY

DHUM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC COMM

 

 

C

 

 

 

 

 

COM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HUM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HUMIDIFY

 

HUM

 

 

 

 

 

HUMIDIFIER

 

 

 

 

 

SOLENOIDVALVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(24VAC)

 

N/A

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S1

 

 

 

 

OUTDOOR

 

 

OUTDOOR

 

 

 

 

 

 

 

SENSOR

 

 

 

 

 

 

 

 

 

 

SENSOR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONNECTION

 

 

S2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-SPEED

HEAT PUMP

O

Y1

W2

Y2

W3

R

C

A01474

Fig. 52—Wiring Schematic for 2-Speed Heat Pump Application with Thermidistat Control (Dual Fuel)

1.Leave 115-v power to furnace turned on.

2.Remove main furnace door.

3.Remove blower access panel.

4.Move setup switch SW-6 to ON position.

5.Manually close blower access panel door switch. Use a piece of tape to hold switch closed.

WARNING: Blower access panel door switch opens 115-v power to control center. No component operation can occur. Caution must be taken when manually closing this switch for service purposes. Failure to follow this warning could result in personal injury or death.

When items 1-5 have been completed, the following will occur:

1.The control center goes through a brief self-test. This self-test takes approximately 2 sec to complete. After door switch is closed, red (microprocessor) LED briefly comes on. Then green LED comes on for 1 sec, followed by 1 sec where both green and yellow LEDs are on. During this time, the microprocessor is checking itself.

2.Inducer motor operates for 20 sec at low speed, operates for 20 sec at high speed, then turns off. Hot surface ignitor is energized for 15 sec, then de-energized.

3.Main blower motor operates for 20 sec at low speed, operates for 20 sec at high speed, then turns off.

4.After component operation test is completed, 1 or more fault codes (11, 22, 41, or 42) will flash. See service label on back of main furnace door for explanation of fault codes.

NOTE: To repeat component test, turn setup switch SW-6 to OFF and then back to ON.

After component test, perform the following:

1.Release blower panel access door switch and turn setup switch SW-6 to OFF position.

2.If applicable, replace blower access panel and check LED status by removing plug in blower access panel.

3.Reinstall main furnace door if all LEDs are off, indicating furnace is ready to operate when a signal from thermostat is received.

PROCEDURE 9—BYPASS HUMIDIFIER MODE

When setup switch SW-3 BPH is in ON position, RPM calculated for low heat is multiplied by 1.15 for all furnace model sizes. This compensates for increased return-air temperature caused by bypassed air supply.

PROCEDURE 10—DEHUMIDIFICATION MODE

A dehumidification input is provided via a 1/4 in. male quick-connect terminal labeled DEHUM located next to the transformer secondary connections. When there is a dehumidify demand, the DEHUM input is activated, which means 24 vac signal is removed from the DEHUM input terminal. In other words, the DEHUM input logic is reversed. the DEHUM input is turned ON when no dehumidify demand exists and is turned OFF when demand exists. This logic reversal has come about from historical use of a standard humidistat to do dehumidification since the contacts open on high humidity, thus removing the 24-v signal to initiate dehumidification.

—47—

Image 47
Contents Table of Contents Installation, Start-up, and Operating InstructionsLocation Codes and Standards Safety ConsiderationsIntroduction Unit Size DimensionsClearances to Combustibles Installer Packet IncludesApplications Procedure 1-GENERAL Electrostatic Discharge ESD Precaution ProcedureCondensate Trap Tubing Factory-Shipped Orientation Procedure 2-UPFLOW ApplicationsCondensate Trap Location Factory-Shipped Orientation Condensate Trap Tubing Alternate Upflow Orientation Condensate Trap Location Alternate Upflow OrientationCondensate Trap Freeze Protection Pressure Switch TubingProcedure 3-DOWNFLOW Applications Condensate Trap Field Drain AttachmentCondensate Trap Tubing Downflow Tube Configuration Right-Hand Trap InstallationCondensate Trap Field Drain Attachment Construct a Working Platform Condensate Trap Field Drain AttachmentsAttic Location and Working Platform Horizontal Right Tube Configuration Furnace Location for Proper Condensate Drainage Location Procedure 1-GENERALProcedure 2-LOW-FIRE only Installation Prohibit Installation on BackInstallation Procedure 1-LEVELING Legs if Desired Procedure 3-FURNACE Location Relative to CoolingequipmentProcedure 4-HAZARDOUS Locations Furnace Plenum Opening Floor Opening Opening DimensionsProcedure 3-INSTALLATION in Horizontal Applications Floor and Plenum Opening DimensionsGeneral Requirements Procedure 4-AIR DuctsReturn Air Connections Ductwork Acoustical TreatmentSupply Air Connections Filter Information Procedure 5-FILTER ArrangementProcedure 6-BOTTOM Closure Panel Procedure 7-GAS PipingBottom Filter Arrangement Internal Pipe Diameter Size Maximum Capacity of PipeNominal Length of Pipe FT Wiring Procedure 8-ELECTRICAL ConnectionsElectrical Data AccessoriesRemoval of Existing Furnaces from Common Vent Systems Procedure 9-DIRECT VentingUnit Wiring Diagram Combustion-Air and Vent Piping Control Center355MAV Variable Speed Furnace Control Opening Location Clearance FTCombustion-Air and Vent Pipe Connections Short Vent 5 to 8 ft System Altitude FT Maximum Allowable Pipe Length ft4001 to 5000‡ Intake Housing Plug Fitting Drain Roof Termination Preferred Concentric Vent and Combustion-Air RoofTermination Preferred Sidewall Termination of Less than 12 General Procedure 10-CONDENSATE DrainMultiventing and Vent Terminations Condensation Drain Protection ″ 25 mm Maximum TYP Sequence of Operation Example of Field Drain AttachmentProcedure 4-EMERGENCY Heat Mode Procedure 1-SELF-TEST ModeProcedure 2-HEATING Mode Procedure 3-HEATING MODE-TWO StageTwo-Speed Applications Procedure 5-COOLING ModeProcedure 6-HEAT Pump Mode Single-Speed ApplicationsProcedure 8-COMPONENT Test Procedure 7-CONTINUOUS FAN ModeProcedure 10-DEHUMIDIFICATION Mode Procedure 9-BYPASS Humidifier ModeProcedure 2-SELECT Setup Switch Positions Procedure 11-ZONE ModeSTART-UP Procedures Procedure 1-GENERAL Switch Position Tons Air Conditioning A/C Airflow Switch PositionSetup Switches SW AIR Setup Allowable Furnace Model SetupProcedure 5-ADJUSTMENTS Procedure 3-PRIME Condensate Trap with WaterProcedure 4-PURGE GAS Lines Filling Condensate Trap Altitude Altitude AVG GAS Specific Gravity of Natural GASHeat Value United States Canada Redundant Automatic Gas Valve Set Temperature RiseAltitude Percent Derate Multiplier Altitude Derate Multiplier for U.S.ASet Thermostat Heat Anticipator ExampleCheck Primary Limit Control Procedure 6-CHECK Safety ControlsCheck Pressure Switches Gas Rate Cu Ft/HrAmp Draw Check with Ammeter Procedure 7-CHECKLISTCombustion and Vent Piping CHECKLIST-START-UP CHECKLIST-INSTALLATIONBook/Tab 1/6 Catalog No
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355MAV specifications

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