Lennox International Inc Gas Units Troubleshooting Continuous Fan Sequence of Operation

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Troubleshooting: Continuous Fan Sequence of Operation

CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION

MANUAL FAN SELECTION MADE AT THERMOSTAT.

AFTER 2 SECOND DELAY, INDOOR BLOWER IS

ENERGIZED ON CONTINUOUS FAN SPEED.

YES

 

YES

 

 

 

YES

THERMOSTAT CALLS FOR FIRST STAGE COOL.

YES

INDOOR BLOWER RAMPS TO FIRST STAGE

COOLING SPEED AFTER A 2−SECOND DELAY.

FIRST−STAGE COOL DEMAND SATISFIED?

NO

SECOND STAGE COOL DEMAND

INDOOR BLOWER RAMPS TO SECOND

STAGE COOL SPEED

SECOND STAGE COOL DEMAND SATISFIED?

YES

INDOOR BLOWER RAMPS DOWN TO FIRST STAGE

COOL SPEED.

THERMOSTAT CALLS FOR FIRST−STAGE HEAT.

YES

AFTER 45−SECOND DELAY, INDOOR BLOWER

SWITCHES TO LOW HEAT SPEED.

FIRST−STAGE HEAT DEMAND SATISFIED.

NO

THERMOSTAT CALLS FOR SECOND−STAGE HEAT.

YES

INDOOR BLOWER SWITCHES TO HIGH HEAT SPEED

AFTER 30−SECOND RECOGNITION PERIOD.

YES

SECOND−STAGE HEAT DEMAND SATISFIED.

YES

INDOOR BLOWER RAMPS DOWN TO LOW

HEAT SPEED.

YES

Repair Parts List

The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA nameplate −− Example: G61MP−36B−045−1. All service must be performed by a licensed pro- fessional installer (or equivalent), service agency, or gas supplier.

Cabinet Parts

Upper access panel

Blower access panel

Top Cap

Control Panel Parts

Transformer

Two−stage integrated control board Door interlock switch

Circuit Breaker Blower Parts

Blower wheel

Motor

Motor mounting frame

Motor capacitor

Blower housing cutoff plate

Heating Parts

Flame Sensor

Heat exchanger assembly Gas manifold Combustion air inducer Gas valve

Main burner cluster Main burner orifices Pressure switches Ignitor

Primary limit control Secondary limit control Flame rollout switches Combustion air inducer auxiliary limit

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Contents Installation Instructions Table of ContentsFront View Side View G61MP Unit Dimensions − inches mmTOP View TOP CAP Glass AssemblyG61MP Parts Arrangement Sight BlowerInstallation Safety InformationDirect Vent Installation NON−DIRECT Vent G61MP Gas FurnaceUse of Furnace as Construction Heater General Combustion, Dilution & Ventilation AirEquipment in Confined Space − ALL AIR from Inside Equipment in Confined Space − ALL AIR from Outside Installation − Setting EquipmentEquipment operation Side View Setting EquipmentFront View END ViewUpflow Applications Refer to Engineering Handbook for additional informationFront View Furnace FrontFurnace Locations Bottom Leveling Bolt Setting an Upflow UnitLeveling Bolt NON−COMBUSTIBLE Floor Opening SizeAdditive Base Floor Opening Size Side ViewINTAKE/EXHAUST Connection Support Frame Drain PAN Blower Access PanelTypical Horizontal Ceiling Application Intake Pipe Exhaust Pipe GAS ConnectorMIN Raised Platform Condensate Line Service Platform Filters Pipe & Fittings SpecificationsPiping and Fittings Specifications Duct SystemOutdoor Termination Kits and Corresponding Equivalencies Model DIAVent Piping Guidelines Minimum Vent Pipe Lengths Maximum Vent Pipe LengthsJoint Cementing Procedure MAX Plug Plastic strapping or a large wire tieVenting Practices TrapTypical Exhaust Pipe Connections Transition Direct Vent applications where combustion air is takenFrom indoors and flue gases are discharged outdoors Sweep ELL Intake Debris Screen Page Inside Corner Detail Inches 305mm or 12 in mmUS Installations1 Canadian Installations2 Direct Vent Roof Termination KIT Exhaust Pipe Termination Size ReductionG61MP TOP View Wall Ring KIT with Straight IntakeFront View Using Existing Chimney ANGLE−CUT in Direction G61MP Direct Vent ApplicationSide View NON−DIRECT Vent Wall Ring Termination G61MP NON−DIRECT Vent Application Using Existing ChimneyCondensate Piping −RINGS CAP HI/LO Screws Condensate AssemblyCoupling CLEAN−OUT Access Vent Nipple TEEGas Piping Furnace Isolate GAS ValveHorizontal Applications Possible Gas Piping Configerations GAS Pipe Capacity − FT3/HR kL/HRElectrical Precautions and ProceduresInterior MAKE−UP BOX Installation Electrostatic Discharge ESDTypical G61MP Field Wiring Diagram Heat / 2 Cool Cut Intact OFF Cut IntactTWO−STAGE Integrated Control Board = Error Code Recall H= 24V Humidifier Output L= do not USEDIP Switches Function Integrated Control Board DIP Switch Settings and Jumpers Typical G61MP Wiring Diagram Unit Start−Up For Your Safety Read Before OperatingIntegrated Control Board White Rodgers 36E Series GAS Valve Honeywell VR8205 Series GAS ValveIf the appliance will not operate, follow the instructions Gas Pressure AdjustmentUrning Off Gas to Unit and call your service techni High Altitude Information Order TWO EachOther Unit Adjustments Carbon Monoxide Poisoning HazardPage Blower Performance Data 270In. w.g High Low Cfm Watts 2840 1450 In. w.g High Low Cfm Watts 2720 1385 In. w.g High Low Cfm Watts 2730 1465 Heating Sequence of Operation Service Electrical SHOCK, Fire Or Explosion HazardPage Planned Service + Y Ignition Control Board Diagnostic CodesFlash Code Status / Error Description Troubleshooting Heating Sequence of Operation On NextHeating Sequence of Operation Thermostat Calls for Heat Status LED − HeartbeatU1.40 microamps Or Heat Demand is SATISFIED. a Five Troubleshooting Cooling Sequence of Operation Cooling Sequence of OperationContinuous LOW Speed FAN Sequence of Operation Troubleshooting Continuous Fan Sequence of OperationRepair Parts List G61MP Start−Up & Performance Check List Heat Anticipator Setting? Thermostat Level?Vent Pipe Sizing Worksheet − LP/Propane High Fire Manifold PressureRequirements for Commonwealth of Massachusetts LY BELOW. Keep Clear of ALL OBSTRUC- Tions
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G61MP Series Units, Gas Units specifications

Lennox International Inc. has established itself as a leader in the heating and cooling industry, and its G61MP Series Gas Units stand as a testament to the company's commitment to innovation and energy efficiency. These gas units are specifically designed for residential applications and are recognized for their reliability, performance, and advanced technology.

One of the main features of the G61MP Series is its variable speed motor, which offers significantly enhanced comfort over traditional single-stage gas units. This technology allows for precise temperature control and improved humidity management. By adjusting its speed according to the heating demand, the unit minimizes temperature fluctuations, leading to a more consistent indoor climate.

Another notable characteristic of the G61MP Series is its ECM blower motor, which operates quietly and efficiently. This motor not only reduces energy consumption but also enhances the overall comfort of the home by providing a steady flow of warm air without the disruptive noise often associated with traditional gas units.

The G61MP Series units are designed with a focus on energy efficiency, boasting an impressive Annual Fuel Utilization Efficiency (AFUE) rating. This rating indicates that these units convert a significant portion of the fuel they consume into usable heat, resulting in lower energy bills for homeowners. The units are equipped with a modulating gas valve that further optimizes fuel usage by adjusting the gas flow according to the heating needs of the home.

Safety is a paramount consideration in the design of the G61MP Series. These units are built with advanced safety features, including a self-diagnostic control system that continuously monitors the unit’s performance. This system alerts homeowners to any potential issues, allowing for proactive maintenance and ensuring the longevity of the equipment.

The G61MP Series is also designed for ease of installation and servicing. Its compact design allows for flexible placement in various home environments, while the user-friendly access panels simplify routine maintenance tasks.

In conclusion, Lennox International Inc.'s G61MP Series Gas Units deliver a combination of advanced technology, energy efficiency, and reliability, making them an excellent choice for homeowners looking to enhance their heating systems. With features designed to maximize comfort, minimize energy costs, and ensure safety, these units represent a significant advancement in residential heating solutions.
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