Goodman Mfg GAS-FIRED WARM AIR FURNACE installation instructions Rack, manifold or gas valve

Page 29

Natural Gas Capacity of Pipe

In Cubic Feet of Gas Per Hour (CFH)

Length of

 

Nominal Black Pipe Size

 

Pipe in Feet

1/2"

3/4"

1"

1 1/4"

1 1/2"

10

132

278

520

1050

1600

20

92

190

350

730

1100

30

73

152

285

590

980

40

63

130

245

500

760

50

56

115

215

440

670

60

50

105

195

400

610

70

46

96

180

370

560

80

43

90

170

350

530

90

40

84

160

320

490

100

38

79

150

305

460

(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on

rigid pipe must be used to reach the outside of the cabinet. A semi-rigid connector to the gas piping may be used from there.

Use listed gas appliance connectors in accordance with their instructions. Connectors must be fully in the same room as the furnace.

Protect connectors and semi-rigid tubing against physical and thermal damage when installed. Ensure aluminum-alloy tubing and connectors are coated to protect against external corrosion when in contact with masonry, plaster, or insulation, or subjected to repeated wetting by liquids such as water (except rain water), detergents, or sewage.

0.60 Specific Gravity Gas)

CFH = BTUH Furnace Input

Heating Value of Gas (BTU/Cubic Foot)

To connect the furnace to the building’s gas piping, the installer must supply a ground joint union, drip leg, manual shutoff valve, and line and fittings to connect to gas valve. In some cases, the installer may also need to supply a transition piece from 1/2" pipe to a larger pipe size. The following stipulations apply when connecting gas piping. Refer to Gas Piping Connections figure for typical gas line connections to the furnace.

Gas piping must be supported external to the furnace cabinet

so that the weight of the gas line does not distort the burner

rack, manifold or gas valve.

Use black iron or steel pipe and fittings for building piping.

Where possible, use new pipe that is properly chamfered,

reamed, and free of burrs and chips. If old pipe is used, be

sure it is clean and free of rust, scale, burrs, chips, and old

pipe joint compound.

Use pipe joint compound on male threads ONLY. Always

use pipe joint compound (pipe dope) that is APPROVED

FOR ALL GASES. DO NOT apply compound to the first two

GAS VALVE

BURNERS

MANIFOLD

ALTERNATE

 

PIPE

UNION

LOCATION

UNION

GAS LINE

 

GROMMET IN

 

GAS LINE

 

HOLE

 

MANUAL

SHUT OFF VALVE (UPSTREAM FROM

PIPE UNION)

HEIGHT REQUIRED

BY LOCAL CODE

GROMMET

IN STANDARD

GAS LINE HOLE

DRIP LEG

threads.

Use ground joint unions.

Install a drip leg to trap dirt and moisture before it can enter

the gas valve. The drip leg must be a minimum of three

inches long.

Install a 1/8" NPT pipe plug fitting, accessible for test gauge

connection, immediately upstream of the gas supply

connection to the furnace.

Always use a back-up wrench when making the connection

to the gas valve to keep it from turning. The orientation of

the gas valve on the manifold must be maintained as

shipped from the factory. Maximum torque for the gas valve

connection is 375 in-lbs; excessive over-tightening may

damage the gas valve.

Install a manual shutoff valve between the gas meter and

unit within six feet of the unit. If a union is installed, the

union must be downstream of the manual shutoff valve,

between the shutoff valve and the furnace.

Tighten all joints securely.

Connect the furnace to the building piping by one of the

following methods:

Rigid metallic pipe and fittings.

Semi-rigid metallic tubing and metallic fittings.

Aluminum alloy tubing must not be used in exterior

locations. In order to seal the grommet cabinet penetration,

 

GROMMET IN

 

ALTERNATE

 

GAS LINE

 

HOLE

DRIP LEG

GAS VALVE

 

 

BURNERS

29

Image 29
Contents GCH95/GME95/GCH9 Table of Contents XVII. Safety Circuit Description XIV. Startup Procedure & AdjustmentXVIII. Troubleshooting XIX. MaintenanceCarbon Monoxide Poisoning Hazard Component Identification Upflow/HorizontalWhat to do if YOU Smell GAS II. Safety ConsiderationsIII. Product Application Electrostatic Discharge ESD PrecautionsGeneral IV. Location Requirements & ConsiderationsSuspended Furnace Clearances and AccessibilityFurnace Suspension Existing Furnace RemovalThermostat Location Thermostat InfluencesCombustion & Ventilation AIR Requirements See 5.3.3-a Horizontal Furnace VI. Installation PositionsVII. Horizontal Applications & Considerations VIII. Propane GAS /HIGH Altitude Installations Recommended Installation PositionsAlternate Electrical and GAS Line Connections Drain PANDirect Vent Terminal Clearances Dual Certification NON-DIRECT/DIRECT Vent IX. VENT/FLUE Pipe & Combustion AIR PipeMaterials and Joining Methods Proper VENT/FLUE and Combustion AIR Piping PracticesTermination Locations Increased Clearance ConfigurationCanadian Venting Requirements Standard Furnace ConnectionsAlternate Furnace Connections Vent/Flue Pipe CutsNON-DIRECT Vent Single Pipe Piping Alternate Vent/Flue LocationDirect Vent Dual Pipe Piping Termination of Multiple Direct Vent Furnaces Alternate Horizontal Vent Termination Dual PipeCondensate Drain Lines & Drain Trap Concentric Vent TerminationStandard Right or Left Side Drain Hose Connections Hose and Tube IdentificationAlternate VENT/FLUE Drain Hose Connections Drain TrapUpright Standard Connections Left Side Upright INSTALLATIONS-TRAP on Left SideUpright Drain Trap Mounting Left or Right Side Panel Horizontal Installations Right Side DownHorizontal Drain Trap Mounting Left or Right Side Panel Left Side DownXI. Electrical Connections Wiring HarnessJunction Box Relocation Junction BOX RelocationField Wiring for GME95 /AMEH96 Furnacewith 2-Stage Thermostat DiagramVolt Thermostat Wiring GME95/AMEH96 Furnace with 2-STAGE Condenser Field WiringGAS Piping Connections Nals XII. GAS Supply and PipingVolt Humidifier Rack, manifold or gas valve Gas Piping Connections Horizontal Upflow ModelPropane Gas Piping Chart Propane Gas Installation TypXIII. Circulating AIR & Filters Propane GAS Tanks and PipingDuct Flange Cut Outs Checking Static Pressure 80% Furnace Shown, 90% SimilarChecking Duct Static Bottom Return AIR Opening Upflow ModelsPermanent Minimum Filter Area sq. XIV. Startup Procedure & AdjustmentDisposable Minimum Filter area sq. Filter LocationsWhite-Rodgers Model 36G54 Two-Stage White-Rodgers Model 36G54 Connected to ManometerHoneywell Model VR9205 Connected to Manometer GAS Supply Pressure MeasurementGAS Input Rate Measurement Natural GAS only GAS Manifold Pressure Measurement and AdjustmentMeasuring Inlet Gas Pressure Alt. Method Circulator Blower Speeds Temperature Rise MeasurementTemperature Rise Setting Furnace Operating Mode Circulator Blower FAN Timing AdjustmentPower UP Heating ModePage XVIII. Troubleshooting XIX. Maintenance XXI. Repair & Replacement Parts XX. Before Leaving AN InstallationNo signal Troubleshooting ChartContinuously Blower Performance Data MH95ACSH96 AMEH96 GCH95 / GCH9115 GME95 MH950453,0704,0905D MH950703,0904,1155 Wiring DiagramMH950905CX GME95 / AMEH96 Exemptions GAS Vent Directly BELOW. Keep Clear of ALL ObstructionsThis page Left Intentionally Blank This page Left Intentionally Blank This page Left Intentionally Blank Quality Makes the Difference