GMH8 39 80% Gas Furnace 80% AFUE, 2-Stage (Convertible .

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TECHNICAL MANUALMANUALGMH8 39" 80% Gas Furnace80% AFUE, 2-Stage (Convertible),Multi-Speed, Upflow/Horizontal Refer to Service Manual RS6610004 for installation, operation, and troubleshooting information. All safety information must be followed as provided in the Service Manual. Refer to the appropriate Parts Catalog for part number information. Model numbers listed on page 3. CThis manual is to be used by qualified, professionally trained HVAC technicians only.Goodman does not assume any responsibility for property damage or personalinjury due to improper service procedures or services performed by an unqualifiedperson.Copyright 2006 - 2009 Goodman Manufacturing Company, L.P.USRT6621014 Rev. 2June 2009

PRODUCT IDENTIFICATIONThe model and manufacturing number are used for positive identification of component parts used in manufacturing.Please use these numbers when requesting service or parts information.GMH8070 3 BXAAProduct TypeMinorRevisionG: GoodmanA: InitialReleaseSupply TypeAFUE8: 80%M: Upflow/HorizontalMajorRevisionA: InitialReleaseFurnace TypeH: Two-Stage/Multi-SpeedAdditional FeaturesNominal Input045:070:090:115:140:N: Natural GasX: Low NOx45,000 Btuh70,000 Btuh90,000 Btuh115,000 Btuh140,000 BtuhCabinet WidthA: 14"C: 21"B: 17 1/2"D: 24 1/2"Airflow Capability3: 12004: 16005: 2000WARNINGHIGH VOLTAGE!Disconnect ALL power before servicing or installing this unit. Multiple powersources may be present. Failure to do so may cause property damage, personalinjury or death.Goodman will not be responsiblefor any injury or property damagearising from improper service or service procedures. Ifyou install or perform service on this unit, you assumeresponsibility for any personal injury or property damagewhich may result. Many jurisdictions require a license toinstall or service heating and air conditioning equipment.WARNING2Installation and repair of this unitshould be performed ONLY byindividuals meeting the requirements of an "entry leveltechnician" as specified by the Air-Conditioning, Heating,and Refrigeration Institute (AHRI). Attempting to install orrepair this unit without such background may result inproduct damage, personal injury or death.WARNING

PRODUCT IDENTIFICATIONThe model and manufacturing number are used for positive identification of component parts used in manufacturing.Please use these numbers when requesting service or parts 81155CN**GMH81405DN**Units with low NOx models available.The United States Environmental Protection Agency (“EPA”) has issued various regulations regarding the introduction and disposal of refrigerants introduced into this unit. Failure to followthese regulations may harm the environment and can lead to the imposition of substantial fines.These regulations may vary by jurisdiction. Should questions arise, contact your local EPA office.Do not connect or use any devicethat is not design certified byGoodman for use with this unit.Serious property damage, personal injury, reduced unitperformance and/or hazardous conditions may resultfrom the use of such non-approved devices.WARNINGTo prevent the risk of propertydamage, personal injury, or death,do not store combustible materials or use gasoline orother flammable liquids or vapors in the vicinity of thisappliance.WARNING3

PRODUCT DESIGNGeneral OperationThe GMH8 furnaces are equipped with an electronic ignitiondevice used to light the burners and an induced draft blowerto exhaust combustion products.An interlock switch prevents furnace operation if the blowerdoor is not in place. Keep the blower access door in placeexcept for inspection and maintenance.This furnace is also equipped with a self-diagnosing electronic control module. In the event a furnace component isnot operating properly, the control module LED will flash onand off in a factory-programmed sequence, depending onthe problem encountered. This light can be viewed throughthe observation window in the blower access door. Refer tothe Troubleshooting Chart for further explanation of the LEDcodes and Abnormal Operation - Integrated Ignition Controlsection in the Service Instructions for an explanation of thepossible problem.The rated heating capacity of the furnace should be greaterthan or equal to the total heat loss of the area to be heated.The total heat loss should be calculated by an approvedmethod or in accordance with “ASHRAE Guide” or “ManualJ-Load Calculations” published by the Air Conditioning Contractors of America.*Obtain from: American National Standards Institute 1430Broadway New York, NY 10018WARNINGTO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO ASPHYXIATION,DO NOT VENT USINGCATEGORY III VENTING.THIS FURNACE MUST BE CATEGORY I VENTED.1. Category I Venting is venting at a non-positive pressure.A furnace vented as Category I is considered a fan-assisted appliance and the vent system does not have tobe “gas tight.” NOTE: Single stage gas furnaces withinduced draft blowers draw products of combustionthrough a heat exchanger allowing, in some instances,common venting with natural draft appliances (i.e. waterheaters). All installations must be vented in accordancewith National Fuel Gas Code NFPA 54/ANSI Z223.1 latest edition. In Canada, the furnaces must be vented inaccordance with the National Standard of Canada, CAN/CSA B149.1 and CAN/CSA B149.2 - latest editions andamendments.NOTE: The vertical height of the Category I venting systemmust be at least as great as the horizontal length of theventing system.2. Line voltage wiring can enter through the right or left sideof the furnace. Low voltage wiring can enter through theright or left side of furnace. The furnace should be as centralized as is practicalwith respect to the air distribution system.3. Conversion kits for propane gas and high altitude naturaland propane gas operation are available. See High Altitude Derate chart for details. Do not install the furnace directly on carpeting, tile, orcombustible material other than wood flooring.4. Installer must supply the following gas line fittings, depending on which entrance is used: When suspending the furnace from rafters or joists,use 3/8" threaded rod and 2” x 2” x 3/8” angle asshown in the Installation and Service Instructions. Thelength of the rod will depend on the application andclearance necessary.Left -- Two 90 Elbows, one close nipple, straight pipeLocation Considerations 4When installed in a residential garage, the furnacemust be positioned so the burners and ignition sourceare located not less than 18 inches (457 mm) abovethe floor and protected from physical damage by vehicles.Right -- Straight pipe to reach gas valve.

PRODUCT DESIGNAccessibility Clearances (Minimum)High Altitude DerateUnobstructed front clearance of 24" for servicing is recommended.When this furnace is installed at high altitude, the appropriate High Altitude orifice kit must be installed. This is required due to the natural reduction in the density of both thegas fuel and combustion air as altitude increases. The kitwill provide the proper design certified input rate within thespecified altitude range.MINIMUM CLEARANCE TO COMBUSTIBLE MATERIALS - INCHESSidesRearFront*103VentSWB61Top1INPUT PER BURNER - 22,500 BTUH NATURAL GAS / 20,000 BTUH L.P.* 24" clearance for serviceability recommended.** Single Wall Vent (SW) to be used only as a conncetor.Refer to the venting tables outlined in the Installation Manual foradditional venting requirements.Note: In all cases accessibility clearance shall take precedence over clearances from the enclosure where accessibility clearances are greater. All dimensions are given ininches.ELEVATION ABOVE SEA-LEVEL (FEET)200030004000US BURNERORIFICE44/5544/5545/56CANADA /5847/5847/57HA-02 HIGH ALTITUDE CONVERSION KIT REQUIREDTabled data is based upon the furnace input being reduced for altitudes above sea level. U.S. 4% per 1,000 feet.Canada 10% derate for 2,000-4,000 feet.High altitude kits are purchased according to the installation altitude and usage of either natural or propane gas. Referto the chart above for a tabular listing of appropriate altituderanges and corresponding manufacturer’s high altitude Natural Gas and Propane Gas kits. For a tabular listing of appropriate altitude ranges and corresponding manufacturer's HighAltitude Pressure Switch kits, refer to either the PressureSwitch Trip Points & Usage Chart in this manual or the Accessory Charts in Service Instructions.5

COMPONENT IDENTIFICATIONPrimary LimitPressure SwitchFlue Pipe ConnectionGas Line Entrance(Alternate)Gas LineEntranceInduced Draft BlowerRollout LimitBlower Door Interlock SwitchInshot BurnerGas grated Control ModuleUpflow/Horizontal1Gas Valve10 Induced Draft Blower2Gas Line Entrance (Alternate)11 Blower Door Interlock Switch3Pressure Switch(es)12 Integrated Control Module4Gas Manifold5Rollout Limit13 Transformer (40 VA)7 Primary Limit14 Circulator Blower8 Gas Line Entrance15 Junction Box9 Flue Pipe Connection (Alternate)6(with fuse and diagnostic LED)

PRODUCT 5CN**GMH81155CN**2119.5GMH81405DN**24.523All dimensions are in inches.7

PRODUCT DESIGNPRESSURE SWITCH TRIP POINTSAND USAGE CHARTPRESSURE SWITCH TRIP POINTSAND USAGE CHARTSQUARE NOSETRIP POINTID BLOWERPRESSURESWITCHROUND NOSETRIP POINTID BLOWERPRESSURESWITCHMODELID BLOWERPRESSURESWITCHPART #MODELID BLOWERPRESSURESWITCHPART 142For installaions in Canada, the GMH8 furnace is certified only to 4,500 ft.* Negative pressure readings are in inches of water column (*w.c.)T.O.D. PRIMARY LIMITPart NumberOpen Setting ( 370190 B1370187 B1370188 B1370198 B13701892101---------------ROLLOUT LIMIT -----1-----AUXILIARY LIMIT SWITCHESPart NumberB1370145Part NumberB1370155Open Setting ( F)GMH80453AN**3001202Open Setting ( CN**GMH81405DN**1

PRODUCT DESIGNCoil Matches:A large array of Goodman brand coils are available for use with the GDH8 furnaces, in dedicated downflow applications.These coils are available in both cased and uncased models (with the option of a field installed TXV expansion device).These 80% furnaces match up with the existing Goodman brand coils as shown in the chart below.Coil Matches (Goodman units using R22 and R-410A):CAPF1824A6EXPANSIONDEVICE:F: FlowraterPRODUCTTYPE:C: Indoor CoilCABINET FINISH:U: UnpaintedP: PaintedN: Unpainted CaseAPPLICATIONA: Upflow/Downflow CoilH: Horizontal A CoilS: Horizontal Slab CoilAREVISIONA: RevisionREFRIGERANTCHARGE:6: R-410A or R-222: R-224: R-410aNOMINAL WIDTH FOR GAS FURNACEA: Fits 14" Furnace CabinetB: Fits 17 1/2" Furnace CabinetC: Fits 21" Furnace CabinetD: Fits 24 1/2" Furnace CabinetN: Does Not Apply (Horizontal Slab Coils)NOMINAL CAPACITY RANGE@ 13 SEER1824: 1 1/2 to 2 Tons3030: 2 1/2 Tons3636: 3 Tons3642: 3 to 3 1/2 Tons3743: 3 to 3 1/2 Tons4860: 4 & 5 Tons4961: 4 & 5 Tons All CAPF coils in B, C, & D widths have insulated blank off plates for use with one size smaller furnaces. All CAPF coils have a CAUF equivalent. All CHPF coils in B, C & D heights have an insulated Z bracket for use with one size smaller furnace. All proper coil combinations are subject to being AHRI rated with a matched outdoor unit.9

PRODUCT DESIGNThermostats:NOTE: Complete lineup of thermostats can be found in the Thermostat Specification Sheets.Filters:Filters are required with this furnace and must be provided by the installer. The filters used must comply with UL900 orCAN/ULCS111 standards. Installing this furnace without filters will void the unit warranty.Upflow FiltersThis furnace has provisions for the installation of return air filters at the side and/or bottom return. The furnace willaccommodate the following filter sizes depending on cabinet size:Side Return(s)Approx.CabinetNominalWidthFilter Size Flow Area(in.)(in.)(in2)All16 x 25 x 1400Bottom ReturnApprox.CabinetNominalWidthFilter Size Flow Area(in.)(in.)(in2)1412 x 25 x 130017-1/214 x 25 x 13502116 x 25 x 140024-1/220 x 25 x 1500Refer to Minimum Filter Area tables to determine filter area requirement. NOTE: Filters can also be installed elsewhere inthe duct system such as a central return.MINIMUM FILTER SIZESFURNACE INPUT45M70M90MFILTER SIZETYPE2permanent2permanent2permanent160 in241 in320 in115M2400 inpermanent140M370 in2permanent45M320 in2disposable70M483 in2disposable90M640 in2disposable2disposable2disposable115M140M800 in738 inPERMANENT NOMINAL 600 F.M. FACE VELOCITYDISPOSABLE NOMINAL 300 F.M. FACE VELOCITY10

PRODUCT DESIGNDual aver Configuration & OperationDual averThis furnace is capable of the following heating modes: Single Stage (Factory Setting) Modified Two-Stage» Fixed 5-Min Low Stage» Auto Time (1-12 Min) Low StageTo change from the factory single-stage operation, adjust thedipswitches on the ignition control as follows:Off OnMode5 Min FixedMode Dipswitch2nd Stage Delay DipswitchAutoNote: This furnace is designed to be used with a single-stage roomthermostat.StartStartCall for HeatCall for HeatSafety Circuit CheckSafety Circuit CheckStart Furnacein Low StageLow-Heat BlowerStart Furnacein Low StageLow-Heat BlowerDelay Time (5 Min)Delay Time (1-12 Min)Gas Valve Switchto 2nd StageGas Valve Switchto 2nd StageBlower Switch toHi Heat OperationBlower Switch toHi Heat OperationT-Stat SatisfiedT-Stat Satisfied11

2,00072,00072,00092,000112,000Output, LP 0%0.20 - 0.500.20 - 0.500.20 - 0.500.20 - 0.500.20 - 0.500.20 - 0.500.20 - 0.500.20 - 0.5025 - 5525 -5520 - 5030 - 6035 - 6535 - 6535 - 6540 - 70Pressure Switch Trip Point (" r Wheel (D" x 1/21/21/23/4Temperature Rise ( F)Blower HorsepowerBlower SpeedsMax CFM @ 0.5 E.S.P.Power Supply (Volts/Hz/Ph)Minimum Circuit Ampacity (MCA) 2Maximum Overcurrent Device3Transformer (VA)ID Blower Pressure SwitchTrip Point (" w.c.)Square Nose BlowersID Blower Pressure SwitchTrip Point (" w.c.)Round Nose BlowersGMH81405DN*GMH80905CN*70,00056,000Rated External Static (" w.c.)GMH80904BN*70,00036,000Input, Natural Gas (BTUH)GMH80903BA45,000Output, Natural Gas (BTUH) 1MODELGMH80704BN*GMH80703AN*GMH80453AN*FURNACE .70-.70-.75-.60-.60-.47-.75-.75-.60-.70-.60Primary Limit Setting ( F)210160170150170200150150Auxiliary Limit Setting ( F)120120120120120120120120Rollout Limit Setting ( F)300300300300300300300300Fan Delay On HeatingOff Heating *Fan Delay On 55555Off Cooling4545454545454545Fan Delay On - Fan Only555555557 / 117 / 117 / 117 / 117 / 117 / 117 / 117 / 113.5 / 103.5 / 103.5 / 103.5 / 103.5 / 103.5 / 103.5 / 103.5 / 1043 / 5543 / 5543 / 5543 / 5543 / 5543 / 5543 / 5543 / 55Gas Supply Pressure(Natural/Propane) (" w.c.)Manifold Pressure(Natural/Propane) (" w.c.)Orifice Size (Natural/Propane)Number of Burners23344456Vent Connector Diameter (inches)44444444120130143153153163163183Shipping Weight (lbs.)*Low NOx model available1.These furnaces are manufactured for natural gas operation. Optional kits are available for conversion to propane operation.2.Minimum Circuit Ampacity calculated as: (1.25 x Circulator Blower Amps) I.D. Blower Amps. Wire sizes should be determined in accordancewith National Electrical Codes.Extensive wire runs will require larger wire sizes.3Maximum Overcurrent protections Device refers to maximumrecommended fuse or circult breaker size. May use time delay fuses or HACRtype circuit breakers of the same sizes as noted.NOTES:1.For elevations above 2000 feet the rating should be reduced by 4% for each 1000 feet above sea level. The furnace must not be derated,orifice changes should only be made if necessary for altitude.2.The total heat loss from the structure as expressed in TOTAL BTU/HR must be calculated by the manufacturers method or in accordance withthe "A.S.H.R.A.E. GUIDE" or "MANUAL J-LOAD CALCULATIONS" published by the AIR CONDITIONING CONTRACTORS OF AMERICA. The totalheat loss calculated should be equal to or less than the heating capacity. Output based on D.O.E. test procedures, steady state efficiency timesoutput.12

BLOWER PERFORMANCE SPECIFICATIONSBLOWER PERFORMANCE(CFM & Temperature Rise vs. External Static Pressure)Model(Heating SpeedAs Shipped)MotorSpeedEXTERNAL STATIC PRESSURE (Inches Water Column)Tons ACat 0.5"ESP0.10.20.30.40.50.60.70.8CFM RISE CFM RISE CFM RISE CFM RISE CFM RISE CFM CFM CFMHIGH3.01555---1511---1459---1392---1344251279 1201 524HIGH3.01437361310391295401310391273411202 1129 1803 1710 331492 1414 01261 1215 01593421561431567421543431493441420 1343 8591089 11578476HIGH4.02182---2127312056321974331895351809 1715 431491 1440 11267 1217 1139LOW2.51063601061601057611056611039611025 51351910 1748 421551 1469 01293 1246 02481---2395352288372217382076411999 1858 521585 1492 31313 1261 IGH5.02554412435432375442240472152492002 1883 631583 1526 5---1373 1308 1245LOW3.01301---1274---1260---1231---1207---1177 10939989549168609311.CFM in chart is without filters(s). Filters do not ship with this furnace, but must be provided by the installer.2.All furnaces ship as high speed cooling. Installer must adjust blower cooling speed as needed.3.For most jobs, about 400 CFM per ton when cooling is desirable.4.INSTALLATION IS TO BE ADJUSTED TO OBTAIN TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE.5.The chart is for information only. For satisfactory operation, external static pressure must not exceed value shown on rating plate. The shaded area indicatesranges in excess of maximum external static pressure allowed when heating. The data for 0.6" w.c. to 0.8" w.c. is shown for air conditioning purposes only.6The dashed (---) areas indicate a temperature rise not recommended for this model.7.The above chart is for U.S. furnaces installed at 0-4000 feet. At higher altitudes, a properly derated unit will have approximately the same temperature rise at aparticular CFM, while the ESP at that CFM will be lower.13

1410203040506070308090100405060700600 CFM90100200022002400 CFM180016001400OUTPUT BTU/HR x 10008012001100100090070800FORMULAS110120130140BTU OUTPUT CFM x 1.08 x RISEBTU OUTPUTRISE CFM1.08BTU OUTPUT vs TEMPERATURE RISE CHART150BLOWER PERFORMANCE SPECIFICATIONSTEMPERATURE RISE

WIRING DIAGRAMSGMH8WARNING:DISCONNECT POWER BEFORESERVICING.WIRING TO UNIT MUST BEPROPERLY POLARIZED AND GROUNDED.INTEGRATEDCONTROL MODULEHUMIDIFIERXFMR (6)GNDGND (8)24 VACHUMIDIFIERC2MVC (9)HIMVH (12)GRWY5 MIN2 STGMODEBR7845612324V THERMOSTAT CONNECTIONSCBLAUXILIARYLIMITSBRINTEGRATEDCONTROL MODULEM1MVL (2)CID BLOWERPRESSURESWITCHGPS (10)NOCPSO (4)TOMICRO HLI (7)YWHLO (1)RRO2 (11)RO1 (5)XFMR (3)24 VACRDRD40 VATRANSFORMERBRBLGASVALVERDPUXFMR-H115 VACXFMR-NFLAME SENSOROR2YLYL1FPBKBK24VBLIND-NCIRCULATORBLWRBK15 PIN PLUGON SOME MODELSGRIDBLWRINDEAC-HBLOWER COMPARTMENTELECTRONICAIR CLEANERLINE-NJUNCTION BOXBKWHDOORSWITCH24 VACHUMIDIFIERDOOR SWITCHSWITCH LOCATED IN BLOWERCOMPARTMENT ON SOME MODELSNOEAC-NLINE-HBURNER 15VXFMRIGN-NINTEGRATED CONTROL MODULEPARKINTEGRATED CONTROL MODULEBK (HI)BL (MED)OR(MED LOW)RD (LOW)WH (N)WHPURDYLWHWHHIGH VOLTAGE!DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THISUNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TODO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.HOT SURFACEIGNITERIGNPRIMARY LIMITPRESSURESWITCHDISCONNECTYLRDYLYLWHBKLGNDNTO 115VAC/ 1Ø /60 HZ POWER SUPPLY WITHOVERCURRENT PROTECTION DEVICEBRBLBRPM C12HOTSURFACEIGNITERBKHI3JUNCTIONBOXWH2 STAGEGAS VALVELINE-NGNDLINE HPUINDUCED DRAFTBLOWERPUPUFLAMESENSORROLLOUT LIMITS(SINGLE CONTROL ON SOME MODELS)0TO 115 VAC/ 1/60HZPOWER SUPPLY WITHOVERCURRENT PROTECTIONDEVICESTEADY ON NORMAL OPERATIONOFFLOW VOLTAGE (24V) CONTROL FAILURE11 FLASH 22 FLASHES PRESSURE SWITCH STUCK CLOSED33 FLASHES PRESSURE SWITCH STUCK OPEN44 FLASHES OPEN HIGH LIMIT55 FLASHES FLAME SENSE WITHOUT GAS VALVE66 FLASHES OPEN ROLLOUT OR OPEN FUSESYSTEM LOCKOUT (RETRIES/RECYCLES EXCEEDED)7 FLASHES LOW FLAME SIGNAL88 FLASHES CHECK IGNITER OR IMPROPER GROUNDCRAPID FLASHES REVERSED 115 VAC POLARITY/VERIFY GNDPK PINKBR BROWNWH WHITEBL BLUEGY GRAYRD REDHI VOLTAGE (115V)EQUIPMENT GNDFIELD GNDFIELD SPLICEHI VOLTAGE FIELDSWITCH (TEMP.)7COLOR CODES:YL YELLOWOR ORANGEPU PURPLEGR GREENBK BLACKLOW VOLTAGE FIELDJUNCTIONTERMINALINTERNAL TOINTEGRATED CONTROLPLUG CONNECTIONIGNITERSWITCH (PRESS.)OVERCURRENTPROT. DEVICENOTES:1. SET HEAT ANTICIPATOR ON ROOM THERMOSTAT AT 0.7 AMPS.2. MANUFACTURER'S SPECIFIED REPLACEMENT PARTS MUST BE USED WHEN SERVICING.3. IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE FURNACE MUST BEREPLACED, IT MUST BE REPLACED WITH WIRING MATERIAL HAVING A TEMPERATURERATING OF AT LEAST 105 C. USE COPPER CONDUCTORS ONLY.4. BLOWER SPEEDS SHOULD BE ADJUSTED BY INSTALLER TO MATCH THE INSTALLATIONREQUIREMENTS SO AS TO PROVIDE THE CORRECT HEATING TEMPERATURE RISE AND THECORRECT COOLING CFM. (SEE SPEC SHEET FOR AIR FLOW CHART)5. UNIT MUST BE PERMANENTLY GROUNDED A ND CONFORM TO N.E.C. AND LOCAL CODES.6. TO RECALL THE LAST 5 FAULTS, MOST RECENT TO LEAST RECENT, DEPRESS SWITCHFOR MORE THAN 2 SECONDS WHILE IN STANDBY(NO THERMOSTAT INPUTS).Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.15

SCHEMATICSHIGH VOLTAGE!DISCONNECT ALL POWER BEFORE SERVICING OR INSTALLING THISUNIT. MULTIPLE POWER SOURCES MAY BE PRESENT. FAILURE TODO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH.CIRCULATORBLOWERHICOOL HEATK2ELECTRONICAIR CLEANERLOHEATCIRPARK NEU 7K1XFMRHOT24 EGAS VALVEHIGHLIMITAUXLIMITPRESSURESWITCHTYPICAL SCHEMATICGMH8 ** MODEL FURNACESWR 50M56-289 INTEGRATED IGNITION CONTROLThis schematic is for reference only. Not all wiring is as shown above. Always refer to the appropriate wiring diagram for the unit being serviced.16

The furnace should be as centralized as is practical with respect to the air distribution system. Do not install the furnace directly on carpeting, tile, or combustible material other than wood flooring. When suspending the furnace from rafters or joists, use 3/8" threaded rod and 2” x 2” x 3/8” angle as

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