Lennox International Inc G61MP Series Units, Gas Units installation instructions

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2 − Check for the correct voltage at the furnace (furnace operating).

3 − Check amp-draw on the blower motor.

Motor Nameplate__________Actual__________

NOTE − Do not secure the electrical conduit directly to the air ducts or structure.

Blower Speeds

NOTE − CFM readings are taken external to unit with a dry evaporator coil and without accessories.

1 − Turn off electrical power to furnace.

2 − Remove blower access panel.

3 − Disconnect existing speed tap at control board speed terminal.

NOTE − Termination of any unused motor leads must be insulated.

4 − Refer to blower speed selection chart on unit wiring dia- gram for desired heating or cooling speed. See blower performance data beginning on Page 48.

5 − Connect selected speed tap at control board speed terminal.

6 − Resecure blower access panel.

7 − Turn on electrical power to furnace. Electronic Ignition

The integrated control has an added feature of an internal Watchguard control. The feature serves as an automatic re- set device for ignition control lockout caused by ignition fail- ure. This type of lockout is usually due to low gas line pres-

sure. After one hour of continuous thermostat demand for heat, the Watchguard will break and remake thermostat de- mand to the furnace and automatically reset the control to begin the ignition sequence.

Exhaust and Air Intake Pipe

1 − Check exhaust and air intake connections for tightness and to make sure there is no blockage.

2 − Are pressure switches closed? Obstructed exhaust pipe will cause unit to shut off at pressure switches. Check termination for blockages.

3 − Reset manual flame rollout switches on burner box cover.

Failure To Operate

If the unit fails to operate, check the following:

1 − Is the thermostat calling for heat?

2 − Are access panels securely in place?

3 − Is the main disconnect switch closed?

4 − Is there a blown fuse?

5 − Is the filter dirty or plugged? Dirty or plugged filters will cause the limit control to shut the unit off.

6 − Is gas turned on at the meter?

7 − Is the manual main shut-off valve open?

8 − Is the internal manual shut-off valve open?

9 − Is the unit ignition system in lock out? If the unit locks out again, inspect the unit for blockages.

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Contents Table of Contents Installation InstructionsFront View Side View G61MP Unit Dimensions − inches mmTOP View Sight Blower Glass AssemblyG61MP Parts Arrangement TOP CAPG61MP Gas Furnace Safety InformationDirect Vent Installation NON−DIRECT Vent InstallationUse of Furnace as Construction Heater Combustion, Dilution & Ventilation Air GeneralEquipment in Confined Space − ALL AIR from Inside Equipment in Confined Space − ALL AIR from Outside Installation − Setting EquipmentEquipment operation END View Setting EquipmentFront View Side ViewRefer to Engineering Handbook for additional information Upflow ApplicationsFurnace Front Front ViewNON−COMBUSTIBLE Floor Opening Size Setting an Upflow UnitLeveling Bolt Furnace Locations Bottom Leveling BoltSide View Additive Base Floor Opening SizeINTAKE/EXHAUST Connection Support Frame Drain PAN Blower Access PanelTypical Horizontal Ceiling Application Intake Pipe Exhaust Pipe GAS ConnectorMIN Raised Platform Condensate Line Service Platform Duct System Pipe & Fittings SpecificationsPiping and Fittings Specifications FiltersModel DIA Outdoor Termination Kits and Corresponding EquivalenciesVent Piping Guidelines Maximum Vent Pipe Lengths Minimum Vent Pipe LengthsJoint Cementing Procedure Trap Plastic strapping or a large wire tieVenting Practices MAX PlugTypical 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 Inches 305mm or 12 in mm Inside Corner DetailUS Installations1 Canadian Installations2 TOP View Wall Ring KIT with Straight Intake Exhaust Pipe Termination Size ReductionG61MP Direct Vent Roof Termination KITFront View G61MP Direct Vent Application Using Existing Chimney ANGLE−CUT in DirectionSide View NON−DIRECT Vent Wall Ring Termination G61MP NON−DIRECT Vent Application Using Existing ChimneyCondensate Piping Vent Nipple TEE Condensate AssemblyCoupling CLEAN−OUT Access −RINGS CAP HI/LO ScrewsFurnace Isolate GAS Valve Gas PipingGAS Pipe Capacity − FT3/HR kL/HR Horizontal Applications Possible Gas Piping ConfigerationsElectrostatic Discharge ESD Precautions and ProceduresInterior MAKE−UP BOX Installation ElectricalTypical G61MP Field Wiring Diagram Heat / 2 Cool Cut Intact Cut Intact OFFTWO−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 Honeywell VR8205 Series GAS Valve White Rodgers 36E Series GAS ValveIf the appliance will not operate, follow the instructions Gas Pressure AdjustmentUrning Off Gas to Unit and call your service techni Order TWO Each High Altitude InformationCarbon Monoxide Poisoning Hazard Other Unit AdjustmentsPage 270 Blower Performance DataIn. 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 Electrical SHOCK, Fire Or Explosion Hazard ServicePage Planned Service + Y Ignition Control Board Diagnostic CodesFlash Code Status / Error Description On Next Troubleshooting Heating Sequence of OperationThermostat Calls for Heat Status LED − Heartbeat Heating Sequence of OperationU1.40 microamps Or Heat Demand is SATISFIED. a Five Cooling Sequence of Operation Troubleshooting Cooling Sequence of OperationContinuous LOW Speed FAN Sequence of Operation Troubleshooting Continuous Fan Sequence of OperationRepair Parts List − LP/Propane High Fire Manifold Pressure Heat Anticipator Setting? Thermostat Level?Vent Pipe Sizing Worksheet G61MP Start−Up & Performance Check ListLY BELOW. Keep Clear of ALL OBSTRUC- Tions Requirements for Commonwealth of Massachusetts
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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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