Goodman Mfg MVC95 Operational Checks & Safety Circuit Description, Coolingmode, Fanonlymode

Page 48

OPERATIONAL CHECKS & SAFETY CIRCUIT DESCRIPTION

•Integrated control module performs safety circuit checks.

•Induced draft blower is energized on high speed for a 15- second prepurge. Humidifier terminal is energized with induced draft blower.

•Induced draft blower steps to low speed following prepurge. Low stage pressure switch contacts are closed.

•Igniter warm up begins upon step to low speed and presence of closed low stage pressure switch contacts.

•Gas valve opens at end of igniter warm up period, delivering gas to burners and establishing flame.

•Integrated control module monitors flame presence. Gas valve will remain open only if flame is detected.

•If the thermostat call is for low heat, gas valve and induced draft blower will continue on low stage. If the call is for high heat, the gas valve and induced draft blower will change to high stage.

•Circulator blower is energized on heat speed following a thirty (30) second blower on delay. The circulator blower requires thirty seconds to ramp up to full speed. Electronic air cleaner terminal is energized with circulator blower.

•Furnace is now operating on the specified stage called for by the two-stage thermostat.

•Furnace runs, integrated control module monitors safety circuits continuously.

•If the two-stage thermostat changes the call from low heat to high heat, the integrated control module will immediately switch the induced draft blower, gas valve, and circulator blower to their high stage settings.

•If the two-stage thermostat changes the call from high heat to low heat, the control will immediately switch the induced draft blower and gas valve to their low stage settings. The circulator blower will remain on high heating speed for thirty (30) seconds before switching to the low heat circulating

speed.

•R and W1 (or R and W1/W2) thermostat contacts open, completing the call for heat.

•Gas valve closes, extinguishing flame.

•Induceddraftblowerisde-energizedfollowingafifteensecond post purge. Humidifier terminals are de-energized.

•Circulator blower continues running for the selected heat off delay period (90, 120, 150 or 180 seconds). The speed run during this period depends on the last heat call provided by the thermostat.

If the last call for heat was a call for low heat, the air circulator motor will run on low heat speed for the duration of the heat off delay period (90, 120, 150 or 180 seconds).

If the last call for heat was a call for high heat, the air circulating motor will run on the high heating speed for thirty (30) seconds and then switch to the low heating speed for

the balance of the heat off delay period (60, 90, 120 or 150 seconds).

•Circulator blower and electronic air cleaner terminal is de- energized.

•CirculatorblowerrampsdowntoOFFduringthe30seconds following the heat off delay period.

•Furnace awaits next call from thermostat.

COOLINGMODE

The normal operational sequence in cooling mode is as follows:

•R and Y1/G or Y2/G thermostat contacts close, initiating a call for cool.

•Integrated control module performs safety circuit checks.

•Outdoor fan and compressor are energized to their appropriate speed.

•Circulator blower is energized on the appropriate cool speed at the level and time determined by the selected ramping profile. Electronic air cleaner terminal is energized with circulator blower.

•Furnace circulator blower and outdoor cooling unit run their appropriate speeds, integrated control module monitors safety circuits continuously.

•R and Y1/G or Y2/G thermostat contacts open, completing the call for cool.

•Outdoor fan and compressor are de-energized.

•Circulator blower continues running during a cool off delay period. The OFF delay time and airflow level are determined by the selected ramping profile.

•Electronic air cleaner terminal and circulator blower are de- energized.

•Furnace awaits next call from thermostat.

FANONLYMODE

The normal operational sequence in fan only mode is as follows:

•R and G thermostat contacts close, initiating a call for fan.

•Integrated control module performs safety circuit checks.

•Circulatorblowerisenergizedoncontinuousfanspeed(30% of the furnace’s maximum airflow capability) following a five

(5)seconddelay. Electronicaircleanerterminalisenergized.

•Circulator blower runs, integrated control module monitors safety circuits continuously.

•R and G thermostat contacts open, completing the call for fan.

•Circulator blower is de-energized. Electronic air cleaner terminal is de-energized.

•Furnace awaits next call from thermostat.

48

Page 47 Page 49
Image 48
Page 47 Page 49
Contents Type FSP Category IV Direct or Non Direct Vent Air Furnace Product Description Normal Sequence of Operation Troubleshooting Safety Precautions What to do if YOU Smell GASElectrostaticdischargeesdprecautions TotheinstallerProduct Description & Application ShippinginspectionFeatures Product DescriptionProductapplication Location Requirements & Considerations Clearancesandaccessibility FurnacesuspensionExistingfurnaceremoval Installation Positions Combustion & Ventilation AIR RequirementsThermostatlocation AlternateVent/FlueLocation RecommendedInstallationPositions Horizontal Applications & ConsiderationsHorizontalFurnace Propane GAS/HIGH Altitude Installations VENT/FLUE Pipe & Combustion AIR PipeMaterialsandjoiningmethods PROPERVENT/FLUEANDCOMBUSTIONAIRPIPINGPRACTICESTerminationlocations Increased Clearance Configuration Vent Termination ClearancesCanadianventingrequirements StandardfurnaceconnectionsVent/FluePipeCuts AlternatefurnaceconnectionsRemove Pipe Relocate Upflow NON-DIRECTVENTSINGLEPIPEPIPINGVertical Termination Single Pipe Alternate Vertical Termination Single PipeHorizontalTerminationSinglePipe DirectventdualpipepipingVertical Terminations Dual Pipe Standard Horizontal Terminations Dual PipeAlternate Horizontal Vent Termination Dual Pipe HorizontalVentingOfMultipleUnitsConcentricventtermination Side Wall Vent KITCondensate Drain Lines & Drain Trap Hose and Tube IdentificationStandardrightorleftsidedrainhoseconnections UPRIGHTINSTALLATIONS-TRAPONRIGHTSIDE Drain Trap MountingExternally UPRIGHTINSTALLATIONS-TRAP on Leftside Horizontalinstallations Counterflow furnacesCut Wiringharness Electrical ConnectionsJunctionbox Relocation 115VOLT Line ConnectionsThermostat Wiring Diagrams 24VOLTTHERMOSTATWIRINGSINGLE-STAGE Heatingthermostatapplication Accessory load specifications are as follows FossilfuelapplicationsAccessories Wiring GAS Supply and Piping24VOLTHUMIDIFIER HighaltitudederateGaspipingconnections Natural Gas Capacity of Pipe Cubic Feet of Gas Per Hour CFHHorizontal Upflow Model Gas Piping ConnectionsPropaneGasInstallationTyp Coupling Degree elbow Inch close nipplePropanegastanksandpiping Propane Gas Piping Chart Circulating AIR & FiltersDuct Work -AIR Flow Checking Duct StaticConsult proper tables for the quantity of air Checking Static Pressure 80% Furnace Shown, 90% SimilarDuctFlangeCutOuts BottomreturnairopeningupflowmodelsStartup Procedure & Adjustment Startup Procedure &ADJUSTMENTFollowing figure shows possible filter locations Temperature Set the thermostat to the lowest settingIf you smell gas after five minutes, immediately follow White-Rodgers Model 36G54 Two-StageGasmanifoldpressuremeasurementandadjustment Turn on the gas supplyHoneywell Model VR9205 Connected to Manometer Measuring Inlet Gas Pressure Alt. MethodTemperaturerise GasinputratemeasurementnaturalgasonlyTemperature Rise Measurement CirculatorblowerspeedsAirflowTable Heat Off Delay Dipswitches Blowerheat Offdelay TimingsComfortnet System OverviewSystem Wiring using Four-Wires System System OperatingTouch To step through the list of installed equip ComfortnetsystemadvancedfeaturesPear. Use Value. TouchConfiguration Networktroubleshooting Is 30 seconds Non-CT compatible single stage AC unitSystemtroubleshooting Power UPNormal Sequence of Operation HeatingmodeOperational Checks & Safety Circuit Description CoolingmodeFanonlymode Troubleshooting & Maintenance Operational Checks Safety Circuit DescriptionTroubleshooting Troubleshooting & Maintenance MaintenanceFollow the manufacturer’s directions for service Before Leaving AN Installation Repair and Replacement PartsInduced Draft Blower Transformer Door Switch MiscellaneousDIP Switches BankTroubleshooting Chart InternalLimit Chart MessageInvalid Trips Status Codes Wiring Diagram CVC9AA, *MVC95AACVC9AB, *MVC95AB

MVC95, CVC9/95 specifications

Goodman Manufacturing has established itself as a leader in the HVAC industry, and among its stellar lineup, the Goodman CVC9/95 and MVC95 stand out for their remarkable features, technologies, and efficiency.

The Goodman CVC9/95 is a high-performance gas furnace, designed for homeowners seeking reliability and cost-effective heating solutions. It operates with an impressive 95% Annual Fuel Utilization Efficiency (AFUE), which means that a significant portion of the fuel it consumes is converted into heat. This level of efficiency not only contributes to lower energy bills but also reduces greenhouse gas emissions, making it an environmentally friendly choice.

One of the standout features of the CVC9/95 is its multi-speed ECM blower motor. This technology adjusts the airflow according to the heating demands of the home, ensuring consistent and comfortable temperatures. The ECM motor also operates quietly, enhancing the comfort of your living space without the disruptive noise often associated with traditional furnaces.

The MVC95, on the other hand, offers similar efficiency with its also 95% AFUE rating. This model is equipped with a patented ignition system that enhances reliability with minimal maintenance needs. Its durable construction includes a heavy-gauge steel cabinet and an insulated blower compartment that minimizes heat loss. This design not only supports optimal performance but also contributes to its longevity.

Both models come with a self-diagnostic control board that provides straightforward troubleshooting capabilities, making it easier for technicians to ensure that your system is operating at peak performance. This feature aids in timely maintenance, which is crucial for extending the lifespan of the unit.

Additionally, Goodman backs their products with a strong warranty, offering a lifetime limited warranty on the heat exchanger and a 10-year limited parts warranty. This assurance provides homeowners peace of mind regarding their investment.

In the landscape of HVAC solutions, the Goodman CVC9/95 and MVC95 models exemplify a commitment to quality, efficiency, and advanced technology. Whether for new constructions or replacements, these furnaces offer superior heating performance coupled with modern conveniences, making them an invaluable choice for homeowners seeking effective climate control solutions. With their low emissions and high efficiency, choosing Goodman means investing in both comfort and sustainability.
Top Page Image Contents