Lennox International Inc Gas Units Other Unit Adjustments, Carbon Monoxide Poisoning Hazard

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Testing for Proper Venting and Sufficient Combustion Air for Non−Direct Vent Applications

WARNING

CARBON MONOXIDE POISONING HAZARD!

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monox- ide poisoning or death.

The following steps shall be followed for each ap- pliance connected to the venting system being placed into operation, while all other appliances con- nected to the venting system are not in operation.

After the G61MP gas furnace has been started, the follow- ing test should be conducted to ensure proper venting and sufficient combustion air has been provided to the G61MP, as well as to other gas-fired appliances which are separate- ly vented.

If a G61MP furnace replaces a Category I furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the heat of the original furnace flue prod- ucts, the existing vent pipe is probably oversized for the single water heater or other appliance. The vent should be checked for proper draw with the remaining appliance.

The test should be conducted while all appliances (both in operation and those not in operation) are connected to the venting system being tested. If the venting system has been installed improperly, or if provisions have not been made for sufficient amounts of combustion air, corrections must be made as outlined in the previous section.

1 − Seal any unused openings in the venting system.

2 − Visually inspect the venting system for proper size and horizontal pitch. Determine there is no blockage or re- striction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

3 − To the extent that it is practical, close all building doors and windows and all doors between the space in which the appliances connected to the venting system are lo- cated and other spaces of the building.

4 − Close fireplace dampers.

5 − Turn on clothes dryers and any appliances not con- nected to the venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan.

6 − Follow the lighting instruction to place the appliance being inspected into operation. Adjust thermostat so appliance will operate continuously.

7 − Use the flame of match or candle to test for spillage of flue gases at the draft hood relief opening after 5 min- utes of main burner operation.

8 − If improper venting is observed during any of the above tests, the venting system must be corrected or

sufficient combustion/make-up air must be provided. The venting system should be re-sized to approach the minimum size as determined by using the ap- propriate tables in appendix G in the current standards of the National Fuel Gas Code ANSI−Z223.1/NPFA 54 in the U.S.A., and the appropriate Natural Gas and Propane appliances venting sizing tables in the cur- rent standard of the CSA−B149 Natural Gas and Pro- pane Installation Codes in Canada.

9 − After determining that each appliance remaining connected to the common venting system properly vents when tested as indicated in step 3, return doors, windows, exhaust fans, fireplace dampers and any other gas-burning appliance to their previous condition of use.

Other Unit Adjustments

Primary and Secondary Limits

The primary limit is located on the heating compartment vestibule panel. The secondary limits are located in the blower compartment, attached to the back side of the blow- er. These limits are factory set and require no adjustment. Flame Rollout Switches (Two)

These manually reset switches are located on the burner box. If tripped, check for adequate combustion air before resetting.

Pressure Switches (Two or Four)

The pressure switches are located in the heating compart- ment on the combustion air inducer. These switches check for proper combustion air inducer operation before allow- ing ignition trial. The switches are factory−set and require no adjustment.

Back−Up Secondary Limit (090, 110 & 135 Models) The back−up secondary limit is located on the combustion air inducer. This switch protects the plastic components from overheating due to indoor blower motor failure. If tripped, check for proper blower operation before resetting. Temperature Rise

After the furnace has been started and supply and return air temperatures have been allowed to stabilize, check the temperature rise. If necessary, adjust the blower speed to maintain the temperature rise within the range shown on the unit nameplate. Increase the blower speed to decrease the temperature. Decrease the blower speed to increase the temperature rise. Failure to do adjust the temperature rise may cause erratic limit operation.

Thermostat Heat Anticipation

Set the heat anticipator setting (if adjustable) according to the amp draw listed on the wiring diagram that is attached to the unit.

Electrical

1 − Check all wiring for loose connections.

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Contents Installation Instructions Table of ContentsTOP View G61MP Unit Dimensions − inches mmFront View Side 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 operation Installation − Setting EquipmentEquipment in Confined Space − ALL AIR from Outside 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 ViewTypical Horizontal Ceiling Application Blower Access PanelINTAKE/EXHAUST Connection Support Frame Drain PAN MIN Raised Platform Condensate Line Service Platform Exhaust Pipe GAS ConnectorIntake Pipe 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 From indoors and flue gases are discharged outdoors Direct Vent applications where combustion air is takenTransition 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 ApplicationCondensate Piping G61MP NON−DIRECT Vent Application Using Existing ChimneySide View NON−DIRECT Vent Wall Ring Termination −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 IntactDIP Switches Function = Error Code Recall H= 24V Humidifier Output L= do not USETWO−STAGE Integrated Control Board Integrated Control Board DIP Switch Settings and Jumpers Typical G61MP Wiring Diagram Integrated Control Board For Your Safety Read Before OperatingUnit Start−Up White Rodgers 36E Series GAS Valve Honeywell VR8205 Series GAS ValveUrning Off Gas to Unit and call your service techni Gas Pressure AdjustmentIf the appliance will not operate, follow the instructions 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 Flash Code Status / Error Description Ignition Control Board Diagnostic Codes+ Y 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 OperationRepair Parts List Troubleshooting Continuous Fan Sequence of OperationContinuous LOW Speed FAN Sequence of Operation 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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