Goodman Mfg MH95/ACSH96/AMEH96/ GCH95/GME95/GCH9 Nals XII. GAS Supply and Piping, Volt Humidifier

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If it is necessary for the installer to supply additional line voltage wiring to the inside of the furnace, the wiring must conform to all local codes, and have a minimum temperature rating of 105°C. All line voltage wire splices must be made inside the furnace junction box.

The integrated control module electronic air cleaner terminals (EAC) are energized with 115 volts whenever the circulator blower is en- ergized.

24 VOLT HUMIDIFIER

The yellow wire connected to the I.D. Blower pressure switch is powered anytime the pressure switch is closed and provides 24 VAC humidifier control. Remove the yellow wire and connect a field supplied jumper wire with a “piggyback” terminal to the pressure switch terminal. Reconnect the yellow wire to the “piggyback” ter- minal on the jumper wire and then connect the 24 VAC line of the humidifier to the stripped end of the jumper wire. Using a wire nut or a field-supplied quick connect terminal can make this connec- tion. The wiring must conform to all local and national codes. Con- nect the COM side of the humidifier to the B/C terminal on the furnace control board (or to the COM side of the 24 VAC trans- former). DO NOT CONNECT 115V HUMIDIFIER TO THESE TERMI-

NALS.

XII. GAS SUPPLY AND PIPING

GENERAL

The furnace rating plate includes the approved furnace gas input rating and gas types. The furnace must be equipped to operate on the type of gas applied. This includes any conversion kits required for alternate fuels and/or high altitude.

CAUTION

TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE WITH ALL OTHER HOUSEHOLD GAS FIRED APPLIANCES OPERATING.

Inlet gas supply pressures must be maintained within the ranges specified below. The supply pressure must be constant and avail- able with all other household gas fired appliances operating. The minimum gas supply pressure must be maintained to prevent unreliable ignition. The maximum must not be exceeded to pre- vent unit overfiring.

Inlet Gas Supply Pressure

Natural Gas

Minimum:

4.5" w.c.

Maximum:

10.0" w.c.

Propane Gas

Minimum:

11.0" w.c.

Maximum:

13.0" w.c.

HIGH ALTITUDE DERATE

When this furnace is installed at high altitude, the appropriate High Altitude orifice kit must be applied. This is required due to the natural reduction in the density of both the gas fuel and combus- tion air as altitude increases. The kit will provide the proper design certified input rate within the specified altitude range.

High altitude kits are purchased according to the installation alti- tude and usage of either natural or propane gas. Contact your distributor for a tabular listing of appropriate altitude ranges and corresponding manufacturer’s high altitude (Natural, Propane Gas, and/or Pressure Switch) kits.

Do not derate the furnace by adjusting the manifold pressure to a lower pressure than specified on the furnace rating plate. The combination of the lower air density and a lower manifold pressure will prohibit the burner orifice from drawing the proper amount of air into the burner. This may cause incomplete combustion, flash- back, and possible yellow tipping.

In some areas the gas supplier may artificially derate the gas in an effort to compensate for the effects of altitude. If the gas is artificially derated, the appropriate orifice size must be determined based upon the BTU/ft3 content of the derated gas and the altitude. Refer to the National Fuel Gas Code, NFPA 54/ANSI Z223.1, and information pro- vided by the gas supplier to determine the proper orifice size.

A different pressure switch may be required at high altitude regardless of the BTU/ft3 content of the fuel used. Contact your distributor for a tabular listing of appropriate altitude ranges and corresponding manufacturer’s pressure switch kits.

PROPANE GAS CONVERSION

WARNING

POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED. THE APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER FURNACE OPERATION. ALL CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE AGENCY.

This unit is configured for natural gas. The appropriate manufacturer’s propane gas conversion kit, must be applied for propane gas installations. Refer to the Section VIII, Propane Gas / High Altitude Installations section for details.

Consult the furnace Specification Sheet for a listing of appropirate kits. The indicated kits must be used to insure safe and proper furnace operation. All conversions must be performed by a quali- fied installer or service agency.

GAS VALVE

This unit is equipped with a 24 volt gas valve controlled during furnace operation by the integrated control module. As shipped, the valve is configured for natural gas. The valve is field convertible for use with propane gas by replacing the regulator spring with a propane gas spring from an appropriate manufacturer’s propane gas conversion kit. Taps for measuring the gas supply pressure and manifold pressure are provided on the valve.

The gas valve has a manual ON/OFF control located on the valve itself. This control may be set only to the “ON” or “OFF” position. Refer to the lighting instructions label or Section XIV, Startup Pro- cedure & Adjustment for use of this control during start up and shut down periods.

GAS PIPING CONNECTIONS

GENERAL

CAUTION

TO AVOID POSSIBLE UNSATISFACTORY OPERATION OR EQUIPMENT DAMAGE DUE TO UNDERFIRING OF EQUIPMENT, USE THE PROPER SIZE OF NATURAL/PROPANE GAS PIPING NEEDED WHEN RUNNING PIPE FROM THE METER/TANK TO THE FURNACE.

When sizing a trunk line, be sure to include all appliances which will operate simultaneously.

The gas piping supplying the furnace must be properly sized based on the gas flow required, specific gravity of the gas, and length of the run. The gas line installation must comply with local codes, or in their absence, with the latest edition of the National Fuel Gas Code, NFPA 54/ANSI Z223.1.

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Contents GCH95/GME95/GCH9 Table of Contents XIV. Startup Procedure & Adjustment XVII. Safety Circuit DescriptionXVIII. Troubleshooting XIX. MaintenanceCarbon Monoxide Poisoning Hazard Upflow/Horizontal Component IdentificationII. Safety Considerations What to do if YOU Smell GASElectrostatic Discharge ESD Precautions III. Product ApplicationIV. Location Requirements & Considerations GeneralClearances and Accessibility Suspended FurnaceFurnace Suspension Existing Furnace RemovalCombustion & Ventilation AIR Requirements Thermostat InfluencesThermostat Location See 5.3.3-a VII. Horizontal Applications & Considerations VI. Installation PositionsHorizontal Furnace Recommended Installation Positions VIII. Propane GAS /HIGH Altitude InstallationsAlternate Electrical and GAS Line Connections Drain PANDirect Vent Terminal Clearances IX. VENT/FLUE Pipe & Combustion AIR Pipe Dual Certification NON-DIRECT/DIRECT VentMaterials and Joining Methods Proper VENT/FLUE and Combustion AIR Piping PracticesIncreased Clearance Configuration Termination LocationsCanadian Venting Requirements Standard Furnace ConnectionsVent/Flue Pipe Cuts Alternate Furnace ConnectionsAlternate Vent/Flue Location NON-DIRECT Vent Single Pipe PipingDirect Vent Dual Pipe Piping Alternate Horizontal Vent Termination Dual Pipe Termination of Multiple Direct Vent FurnacesCondensate Drain Lines & Drain Trap Concentric Vent TerminationHose and Tube Identification Standard Right or Left Side Drain Hose ConnectionsDrain Trap Alternate VENT/FLUE Drain Hose ConnectionsUpright INSTALLATIONS-TRAP on Left Side Upright Standard Connections Left SideHorizontal Installations Right Side Down Upright Drain Trap Mounting Left or Right Side PanelLeft Side Down Horizontal Drain Trap Mounting Left or Right Side PanelWiring Harness XI. Electrical ConnectionsJunction Box Relocation Junction BOX RelocationThermostat Diagram Field Wiring for GME95 /AMEH96 Furnacewith 2-StageVolt Thermostat Wiring GME95/AMEH96 Furnace with 2-STAGE Condenser Field WiringVolt Humidifier Nals XII. GAS Supply and PipingGAS Piping Connections Rack, manifold or gas valve Horizontal Upflow Model Gas Piping ConnectionsPropane Gas Installation Typ Propane Gas Piping ChartXIII. Circulating AIR & Filters Propane GAS Tanks and PipingChecking Static Pressure 80% Furnace Shown, 90% Similar Duct Flange Cut OutsChecking Duct Static Bottom Return AIR Opening Upflow ModelsXIV. Startup Procedure & Adjustment Permanent Minimum Filter Area sq.Disposable Minimum Filter area sq. Filter LocationsWhite-Rodgers Model 36G54 Connected to Manometer White-Rodgers Model 36G54 Two-StageHoneywell Model VR9205 Connected to Manometer GAS Supply Pressure MeasurementMeasuring Inlet Gas Pressure Alt. Method GAS Manifold Pressure Measurement and AdjustmentGAS Input Rate Measurement Natural GAS only Temperature Rise Temperature Rise MeasurementCirculator Blower Speeds Circulator Blower FAN Timing Adjustment Setting Furnace Operating ModePower UP Heating ModePage XVIII. Troubleshooting XIX. Maintenance XX. Before Leaving AN Installation XXI. Repair & Replacement PartsTroubleshooting Chart No signalContinuously MH95 Blower Performance DataACSH96 AMEH96 GCH95 / GCH9115 GME95 Wiring Diagram MH950453,0704,0905D MH950703,0904,1155MH950905CX GME95 / AMEH96 GAS Vent Directly BELOW. Keep Clear of ALL Obstructions ExemptionsThis page Left Intentionally Blank This page Left Intentionally Blank This page Left Intentionally Blank Quality Makes the Difference