ComfortNET GMVC8 Manuel d'instructions

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

10• Drafts, or dead spots behind doors, in corners, or undercabinets.• Hot or cold air from registers.• Radiant heat from the sun.• Light fixtures or

11Vent the furnace in accordance with the National Fuel GasCode NFPA 54/ANSI Z223.1 - latest edition. In Canada, ventthe furnace in accordance with t

12Proper ChimneyTermination?(Check 1)Chimney channelfree of solid andliquid fuelappliances?(Check 2)Change ventingarrangements (Fix 2)Crown in goodcon

13Appliances which burn propane (sometimes referred to as LP(liquefied petroleum)) gas are considered gas-fired appliances.CHECK 3 - CHIMNEY C ROWN CO

14CHECK 7 - COMPLETE THE I NSTALLATION.If Checks 1 through 6 have been satisfactory, and the liner is anacceptable size as determined by the tables in

15FIX 3 - REBUILD THE C ROWNIf the chimney crown is damaged, a qualified mason must re-pair it in accordance with nationally recognized building codes

16HIGHVOL TAGE!TOAVOIDTHERISKOFINJURY,ELECT RICALSHOCKORDEATH,THEFURNACEMUSTBEELECT RICALLYGROUNDEDINACCORDANCEWITHLOCALCODESOR

171. Measure resistance between the neutral (white)connection and one of the burners.2. Resistance should measure 10 ohms or less.This furnace is equi

18To use a single-stage thermostat, turn off power to the furnace,move the thermostat selection DIP switch to the OFF position.Set the desired transit

19Accessories WiringIf it is necessary for the installer to supply additional line volt-age wiring to the inside of the furnace, the wiring must confo

2Table of ContentsSAFETY CONSIDERATIONS ...

20NOTE: Do not remove the gas valve inlet plug before the gasline is installed. Replace if water or debris has been introduced.Natural Gas Minimum: 4

21• Use black iron or steel pipe and fittings for the buildingpiping.• Use pipe joint compound on male threads only. Pipejoint compound must be resis

22GAS P IPING C HECKSBefore placing unit in operation, leak test the unit and gas con-nections.TOAVOIDTHEPOSSIBILITYOFEXPLOSIONORFIRE,NEVERUS

233/8" 1/2" 5/8" 3/4" 7/8" 1-1/8" 1/2" 3/4" 1" 1-1/4" 1-1/2"10 39 92 199 329 501 935 275 567 1,

24Checking Static Pressure(80% Furnace Shown, 90% Similar)FILTERS - READ T HIS SECTION B EFORE I NSTALLING T HERETURN AIR DUCTWORKFilters must be used

2512. After the burners are lit, set the thermostat to desiredtemperature.FURNACE SHUTDOWN1. Set the thermostat to the lowest setting.The integrated c

26Gas Valve On/OffSelector SwitchRegulatorVentHigh FireRegulatorAdjustLow FireRegulatorAdjustHoneywell Model VR9205 (Two-Stage)iManometerManometerHose

274. Attach a hose and manometer to the outlet pressurebarb fitting (Honeywell valve) or outlet pressure boss(White-Rodgers valve).5. Turn ON the gas

28RISE = SUPPLY AIRRETURN AIR HEAT EXCHANGERRADIATION "LINE OF SIGHT"TRETURNTSUPPLY TSUPPLY - TRETURNTemperature Rise MeasurementCIRCU

29• Profile A provides only an OFF delay of one (1) minuteat 100% of the cooling demand airflow.OFF100% CFM 100% CFM1 minOFF• Profile B ramps up to fu

3Table of ContentsSTART-UP PROCEDURE AND ADJUSTMENT ...

301290 seconds OFF OFF120 seconds ON OFF150 seconds* OFF ON180 seconds ON ON(*Indicates factory setting)Heat OFF DelayDIP Sw itch No.Sw itch Bank: S1H

31the ECM motor. If the outdoor unit or thermostat is respon-sible for determining the demand, it calculates the demandand transmits the demand along

32NOTE: Use of a transformer is recommended if installing a dualfuel/fossil fuel system. Failure to use the transformer in theoutdoor unit could resu

33FURNACE ADVANCED F EATURES MENUS (ACCESSED THROUGH COMMUNICATING T HERMOSTAT)Submenu Item Indication (for Display Only; not User Modifiable)Number

34Submenu Item Indication (for Display Only; not User Modifiable)Mode (MODE) Displays the current furnace operating modeCFM (CFM) Displays the airflow

35HEATING MODEThe normal operational sequence in heating mode is as fol-lows:• R and W1 (or R and W1/W2) thermostat contacts close,initiating a call f

36• Furnace runs, integrated control module monitors safetycircuits continuously.• If the two-stage thermostat changes the call from lowheat to high h

37SAFETY CIRCUIT DESCRIPTIONA number of safety circuits are employed to ensure safe andproper furnace operation. These circuits serve to control anyp

38RESETTING F ROM L OCKOUTFurnace lockout results when a furnace is unable to achieveignition after three attempts during a single call for heat. It

39INDUCED D RAFT AND C IRCULATOR B LOWERSThe bearings in the induced draft blower and circulator blowermotors are permanently lubricated by the manufa

4SAFETY CONSIDERATIONSAdhere to the following warnings and cautions when installing,adjusting, altering, servicing, or operating the furnace. To en

40TROUBLESHOOTING CHARTSymptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat)Diagnostic/Status LED CodesFault DescriptionComfortNet™ The

41TROUBLESHOOTING CHARTSymptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat)Diagnostic/Status LED CodesFault DescriptionComfortNet™ The

42TROUBLESHOOTING CHARTSymptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat)Diagnostic/Status LED CodesFault DescriptionComfortNet™ The

43TROUBLESHOOTING CHARTSymptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat)Diagnostic/Status LED CodesFault DescriptionComfortNet™ The

44TROUBLESHOOTING CHARTSymptoms of Abnormal Operation (Legacy & ComfortNet™ Thermostat)Diagnostic/Status LED CodesFault DescriptionComfortNet™ The

45STATUS CODESC2OnHIb0d4C1b2E4HIINTERNAL CONTROL FAULT/NOPOWERNORMAL OPERATIONLOCKOUT DUE TO EXCESSIVE RETRIESLOW STAGE PRESSURE SWITCH STUCK CLOSED A

46AIR FLOW DATANOTE: Airflow data shown applies to non-communicating mode operation only. For a fully communicatingsystem, please see the outdoor unit

47DIP SWITCHES123490 Off Off120On Off150 Off On180 On On2 Stage StatOn On2 Stage Stat On Off1 Stg Stat 5 min delay Off Off1 Stg Stat auto delay Off On

48*MVC8, *DVC8 WIRING DIAGRAMWiring is subject to change. Always refer to the wiring diagram on the unit for the most up-to-date wiring.HIGH VOLTAGE!D

5 CARBON MONOXIDE POISONING HAZARD - Special Warning for Installation of Furnace or Air Handling Units inEnclosed Areas such as Garages, U

6This product may also be installed with the ComfortNet ther-mostat and a non-ComfortNet compatible single stage air con-ditioning unit. However, this

7• The furnace heat exchanger, components, ductsystem, air filters and evaporator coils are thoroughlycleaned following final construction clean up.•

8• For counterflow installations, the air conditioning coilmust be downstream from the heat exchanger of thefurnace.• Counterflow installation over a

9CLEARANCES AND ACCESSIBILITYUnobstructed front clearance of 24" for servicing is recom-mended.TOPB1-VENT SINGLE(PLENUM)1" 6" 1" 3