Goodman Mfg VC8 User Manual

CUS®ATTENTION INSTALLING PERSONNELRECOGNIZE THIS SYMBOL AS A SAFETY PRECAUTION.Installer: Affix all manuals adjacent to the unit.These furnaces comp

10EXTERIOR MASONRY CHIMNEYS - CATEGORY I FURNACES ONLYheating/cooling costs but have created a problem supplyingcombustion and ventilation air for gas

11EXTERIOR MASONRY CHIMNEYS - CATEGORY I FURNACES ONLY11. Reconnect the induced draft blower power leads. NOTE:If the wires are not long enough, pull

12EXTERIOR MASONRY CHIMNEYS - CATEGORY I FURNACES ONLYIf the chimney does not meet these termination requirements,but all other requirements in the ch

13EXTERIOR MASONRY CHIMNEYS - CATEGORY I FURNACES ONLYNext, use a flashlight and small mirror to sight up the liner. Bvent must be supported so as to

14ELECTRICAL CONNECTIONSFIX 3 - REBUILD THE C ROWNIf the chimney crown is damaged, a qualified mason must re-pair it in accordance with nationally rec

15ELECTRICAL CONNECTIONSand in the National Standard of Canada, CAN/CSA B149.1 andCAN/CSA B149.2 - latest editions and amendments.To install the liner

16ELECTRICAL CONNECTIONSJUNCTION B OX R ELOCATIONEDGESOFSHEETMETALHOLESMAYBESHARP.USEGLOVESASAPRECAUTIONWHENREMOVINGHOLEPLUGS.WARNINGL

17ELECTRICAL CONNECTIONSRY CNEUFurnace IntegratedControl ModuleRemoteCondensing Unit(Single-Stage Cooling)Dehumidistat[Optional]To apply a single-stag

18GAS SUPPLY AND PIPINGA heat pump thermostat with three stages of heat is required toproperly use a two-stage furnace in conjunction with a heatpump.

19CIRCULATING AIR AND FILTERSair temperature rise must be within the range listed on the fur-nace nameplate. Should this appliance be converted to LP

2Table of ContentsSAFETY PRECAUTIONS ...

20GAS SUPPLY AND PIPING• Install a manual shutoff valve between the gas meterand unit within six feet of the unit. If a union is installed,the union

21CIRCULATING AIR AND FILTERSPROPANE G AS T ANKS AND P IPINGIFTHEGASFURNACEISINSTALLEDINABASEMENT,ANEXCAVATEDAREAORCONFINEDSPACE,ITIS

22START-UP PROCEDURE AND ADJUSTMENTA closed return duct system must be used, with the return ductconnected to the furnace. NOTE: Ductwork must never

23START-UP PROCEDURE AND ADJUSTMENTply with UL900 or CAN/ULCS111 standards. If the furnace isinstalled without filters, the warranty will be voided.NO

24START-UP PROCEDURE AND ADJUSTMENTINLET OUTLETGas Valve On/OffSelector SwitchWhite-Rodgers Model 36G54 (Two-Stage)InletPressureBossLow FireRegulatorA

25START-UP PROCEDURE AND ADJUSTMENTGas LineGasShutoffValveGas Line To FurnaceDrip Leg Cap With FittingManometer HoseManometerOpen ToAtmosphereMeasurin

26START-UP PROCEDURE AND ADJUSTMENT4. Calculate the furnace input in BTUs per hour (BTU/hr).Input equals the sum of the installation’s gas heatingvalu

27START-UP PROCEDURE AND ADJUSTMENTThe cooling system manufacturer’s instructions must bechecked for required air flow. Any electronic air cleaners o

28START-UP PROCEDURE AND ADJUSTMENT7. Select the heating speed for your model from the heatingspeed chart in the Specification Sheet. The adjust sett

29COMFORTNET™ SYSTEMECM motor. If the outdoor unit or thermostat is responsiblefor determining the demand, it calculates the demand andtransmits the

3Table of ContentsCIRCULATION A IR FILTERS ...

30COMFORTNET™ SYSTEMFour wires are required between the indoor unit and thermo-stat.NOTE: Use of the CTK01AA transformer is recommended ifinstalling a

31COMFORTNET™ SYSTEMACCESSING AND N AVIGATING THE A DVANCED F EATURES M ENUSThe advanced system features are accessed using theComfortNet thermostat.

32COMFORTNET™ SYSTEMFURNACE A DVANCED F EATURES M ENUSSubmenu Item Indication (for Display Only; not User Modifiable)Number of Heat Stages (HT STG) Di

33COMFORTNET™ SYSTEMNETWORK TROUBLESHOOTINGCommunications is achieved by taking the differencebetween two dc signals. The signals and transmission li

34OPERATIONAL CHECKS & SAFETY CIRCUIT DESCRIPTIONHEATING M ODEThe normal operational sequence in heating mode is as fol-lows:• R and W1 (or R and

35OPERATIONAL CHECKS & SAFETY CIRCUIT DESCRIPTION• Gas valve opens at end of igniter warm up period, deliveringgas to burners and establishing fla

36TROUBLESHOOTING & MAINTENANCE Burner FlameSAFETY CIRCUIT DESCRIPTIONA number of safety circuits are employed to ensure safe andproper furnace o

37MISCELLANEOUSFAULT R ECALLThe ignition control is equipped with a momentary push-buttonswitch that can be used to display the last six faults on the

38MISCELLANEOUSBURNERSVisually inspect the burner flames periodically during the heat-ing season. Turn on the furnace at the thermostat and allowseve

39TROUBLESHOOTING CHARTComfortNet™ Thermostat Only Symptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat) Diagnostic/Status LED Codes Fa

4SAFETY PRECAUTIONSAdhere to the following warnings and cautions when install-ing, adjusting, altering, servicing, or operating the furnace.To ensure

40TROUBLESHOOTING CHARTComfortNet™ Thermostat Only Symptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat) Diagnostic/Status LED Codes Fa

41TROUBLESHOOTING CHARTComfortNet™ Thermostat Only Symptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat) Diagnostic/Status LED Codes Fa

42TROUBLESHOOTING CHARTComfortNet™ Thermostat Only Symptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat) Diagnostic/Status LED Codes Fa

43TROUBLESHOOTING CHARTComfortNet™ Thermostat Only Symptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat) Diagnostic/Status LED Codes Fa

44STATUS CODESC 2O PH Ib 0d 4C 1b 2E 4H IINTERNAL CONTROL FAULT/NO POWERNORMAL OPERATIONLOCKOUT DUE TO EXCESSIVE RETRIESLOW STAGE PRESSURE SW

45AIR FLOW DATA *DVC81155CX* *DVC80905CX* *DVC80703BX* *MVC81155CX* *MVC80905CX* *MVC80704BX*To set airflow:C ------- 7.5

46Wiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.HIGH VOLTAGE!DISCONNECT ALL POWER BEFORE

47*MVC8_AB, *DVC8_AA WIRING DIAGRAMTO +VDCTOMICROTORGND (4)+ VDC (1)RX (2)TX (3)CIRCULATORINDOORAIRBLWRRDGYBLBKPROPERLY POLARIZEDHUMIDIFIERGNDPROTECTI

48Goodman Manufacturing Company, L.P.5151 San Felipe, Suite 500, Houston, TX 77056www.goodmanmfg.com© 2009-2010 Goodman Manufacturing Company, L.P.

5PRODUCT APPLICATIONTOPREVENTPERSONALINJURYORDEATHDUETOASPHYXIATION,THISFURNACEMUSTBECATEGORYIVENTED.DONOTVENTUSINGCATEGORYIIIVE

6LOCATION REQUIREMENTS AND CONSIDERATIONS• It must be installed per the installation instructionsprovided and per local and national codes.• It must b

7LOCATION REQUIREMENTS AND CONSIDERATIONSTo ensure proper furnace operation, install, operate andmaintain the furnace in accordance with these install

8LOCATION REQUIREMENTS AND CONSIDERATIONS Top - 1"SideClearance - 1"Back - 0"Front Clearance - 3"Vent Pipe Clearance to Com

9COMBUSTION & VENTILATION CATEGORY I VENTING AIR REQUIREMENTSSuspended FurnaceEXISTING F URNACE R EMOVALNOTE: When an existing furnace is removed