Bryant 355MAV instruction manual Redundant Automatic Gas Valve, Set Temperature Rise

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INLET PRESSURE TAP

ON/OFF SWITCH

FFO

ON

LOW-FIRE ADJUSTMENT ALLEN SCREW (UNDER CAP)

HIGH-FIRE ADJUSTMENT ALLEN SCREW (UNDER CAP)

BURNER

ENCLOSURE

REFERENCE

PRESSURE TAP MANIFOLD

PRESSURE

TAP

A97386

Fig. 56—Redundant Automatic Gas Valve

BURNER

ORIFICE

A93059

Fig. 57—Burner Orifice

m.Move setup switch SW-2 to OFF position and jumper R and W2 thermostat connections. (See Fig. 31.) This keeps furnace locked in high-heat operation. Repeat items h through k for high-heat operation.

EXAMPLE: (High-heat operation at 0-2000 ft altitude) Furnace input from rating plate is 100,000 Btuh.

Btu heating input = Btu/cu ft X cu ft/hr Heating value of gas = 975 Btu/cu ft

Time for 1 revolution of 2-cu ft dial = 70 sec Gas rate = 103 cu ft/hr (from Table 15)

Btu heating input = 103 X 975 = 100,425 Btuh. In this example, the orifice size and manifold pressure adjustment is within ±2 percent of the furnace input rate.

NOTE: Measured gas inputs (high heat and low heat) must be within ±2 percent of that stated on furnace rating plate when installed at sea level or derated per that stated above when installed at higher altitudes.

n.Remove jumper across R, W/W1, and W2 thermostat connections to terminate call for heat.

B. Set Temperature Rise

CAUTION: Temperature rise must be within limits specified on unit rating plate. Recommended operation is at midpoint of rise or above. Failure to follow this caution may result in overheating the heat exchangers or condensing flue gases in heat exchanger areas not designed for condensate.

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Contents Table of Contents Installation, Start-up, and Operating InstructionsLocation Introduction Safety ConsiderationsCodes and Standards Unit Size DimensionsClearances to Combustibles Installer Packet IncludesApplications Procedure 1-GENERAL Electrostatic Discharge ESD Precaution ProcedureCondensate Trap Location Factory-Shipped Orientation Procedure 2-UPFLOW ApplicationsCondensate Trap Tubing 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 BackProcedure 4-HAZARDOUS Locations Procedure 3-FURNACE Location Relative to CoolingequipmentInstallation Procedure 1-LEVELING Legs if Desired Furnace Plenum Opening Floor Opening Opening DimensionsProcedure 3-INSTALLATION in Horizontal Applications Floor and Plenum Opening DimensionsGeneral Requirements Procedure 4-AIR DuctsSupply Air Connections Ductwork Acoustical TreatmentReturn Air Connections Filter Information Procedure 5-FILTER ArrangementProcedure 6-BOTTOM Closure Panel Procedure 7-GAS PipingBottom Filter Arrangement Nominal Length of Pipe FT Maximum Capacity of PipeInternal Pipe Diameter Size 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 Multiventing and Vent Terminations Procedure 10-CONDENSATE DrainGeneral 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 ModeSTART-UP Procedures Procedure 1-GENERAL Procedure 11-ZONE ModeProcedure 2-SELECT Setup Switch Positions Switch Position Tons Air Conditioning A/C Airflow Switch PositionSetup Switches SW AIR Setup Allowable Furnace Model SetupProcedure 4-PURGE GAS Lines Procedure 3-PRIME Condensate Trap with WaterProcedure 5-ADJUSTMENTS Filling Condensate Trap Heat Value Altitude AVG GAS Specific Gravity of Natural GASAltitude 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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