Lennox International Inc G61MP specifications On Next

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HEATING SEQUENCE OF OPERATION

NORMAL AND ABNORMAL HEATING MODE

POWER ON

CONTROL SELF−CHECK OKAY?

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. CHECK FOR BROKEN IGNITOR OR OPEN IGNITER CIRCUIT. DS1 AND DS2 ALTERNATING FAST FLASH.

POLARITY OKAY?

YES

IS THERE A

PROPER GROUND?

YES

IS VOLTAGE

ABOVE 75 VOLTS?

YES

BURNER OFF?

(CONTINUOUS FLAME CHECK)

YES

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF. (RESET CONTROL BY

TURNING MAIN POWER OFF.) DS1 ON, DS2 ON

NO

 

 

POLARITY REVERSED.

 

 

 

DS1 −− FAST FLASH

 

 

 

 

 

 

 

 

 

 

 

DS2 −− SLOW FLASH

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.

 

 

 

 

 

DS1 AND DS2 ALTERNATING FAST FLASH.

 

NO

 

 

 

 

 

 

 

 

 

 

SIGNAL HOLDS UNTIL VOLTAGE RISES ABOVE 75 VOLTS.

 

 

 

 

 

 

DS1 AND DS2 ALTERNATING FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

 

 

 

INDOOR BLOWER ON HEATING SPEED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 SLOW FLASH, DS2 OFF.

 

NO

A

NORMAL OPERATION:

DS 1 −− SIMULTANEOUS SLOW FLASH DS 2 −− SIMULTANEOUS SLOW FLASH

B

THERMOSTAT CALLS FOR HEAT: DS 1 −− SIMULTANEOUS FAST FLASH DS 2 −− SIMULTANEOUS FAST FLASH

YES

PRIMARY AND SECONDARY LIMIT

SWITCHES CLOSED?

YES

ROLLOUT SWITCH CLOSED?

YES

FIRST (LOW) STAGE PRESSURE

SWITCHES OPEN?

YES

SECOND (HIGH) STAGE PRESSURE

SWITCHES OPEN?

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER ON. HAS PRIMARY OR

SECONDARY LIMIT RESET WITHIN 3 MINUTES?

DS1 SLOW FLASH, DS2 ON.

 

 

NO

 

NO

 

 

 

 

60−MINUTE LIMIT WATCHGUARD MODE.

 

 

 

 

GAS VALVE OFF, COMBUSTION AIR INDUCER

 

 

OFF, INDOOR BLOWER OFF WITH DELAY.

 

 

DS1 AND DS2 ALTERNATING SLOW FLASH.

 

 

 

 

 

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

 

HAS MANUAL ROLLOUT SWITCH(ES) BEEN

 

 

 

 

RESET (CLOSED) WITHIN 3 MINUTES?

 

 

DS1 SLOW FLASH, DS2 ON.

NO

 

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. CONTROL REMAINS UNTIL PRESSURE SWITCH IS DETECTED OPEN.

DS1 OFF, DS2 SLOW FLASH.

NO

YES

NO

YES

 

 

 

 

GAS VALVE OFF.

TWO−STAGE OR SINGLE−STAGE THERMOSTAT

 

COMBUSTION AIR INDUCER OFF.

CALL FOR HEAT

 

INDOOR BLOWER OFF.

 

 

 

 

CONTROL WILL NOT ATTEMPT SECOND−STAGE

 

 

 

 

 

 

 

OPERATION DURING THIS HEAT DEMAND.

 

 

 

 

FIRST−STAGE OPERATION WILL BE ATTEMPTED.

COMBUSTION AIR INDUCER ON LOW SPEED.

 

 

 

 

DS1 OFF, DS2 FAST FLASH.

DS1 AND DS2 SIMULTANEOUS FAST FLASH

 

 

 

 

 

 

 

CONTINUED ON NEXT PAGE

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Contents Table of Contents G61MPOptional Accessories − Must be Ordered Extra SpecificationsAfue Direct Vent Blower Data G61MP−36B−045 Performance Less Filter1495 2340 1285 1385 2410 Glass Assembly G61MP Parts ArrangementTOP CAP Sight BlowerDoor Interlock Switch S51 Circuit Breaker CB8−Control Box Control Transformer T1 Integrated Control Board A92Page TWO−STAGE Integrated Control Board Integrated Control Board Terminals 120VAC Neutral120VAC Line Integrated Control Board 5 Pin Terminal−Blower Compartment Blower Motor B3 and Capacitor C4 Secondary Limit Controls S21DS1 DS2 Description Supply AIR Blower−Heating Components Flame Sensor IgnitorBurners Figure Ignitor Bracket Burners Front View Burners TOP ViewFlame Rollout Switches S47 Combustion Air Inducer Prove Switch S18Clamshell Heat Exchanger Primary Limit Control S10CAI & Cold END Header BOX Assembly Dual Combustion AIR Prove SwitchFirst stage Negative Pressure Second stage Positive Combustion Air Inducer B6 II−PLACEMENT and Installation Outdoor Termination Kits and Corresponding Equivalencies−Vent Piping Guidelines Minimum Vent Pipe Lengths −PVC Joint Cementing ProcedureMaximum Vent Pipe Lengths − Venting Practices Upflow or Downflow Direct or NON-DIRECT Vent ApplicationsTypical Exhaust Pipe Connections Direct Vent applications where combustion air is taken From indoors and flue gases are discharged outdoorsReducer Plug ReducerCarbon Monoxide Poisoning Hazard Sweep ELLPage − G61MP Vent Termination − AIR Inlet of Other Appliance Exhaust Pipe Termination Size Reduction Front View Side ViewUsing 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 Condensate Assembly Vent Nipple TEE Screw Coupling CLEAN−OUT AccessHose clamp −RINGS CAP HI/LO Screws−Preliminary and Seasonal Checks For Your Safety Read Before Operating−Heating Start-Up −Safety or Emergency Shutdown IV−HEATING System Service Checks A−C.S.A. Certification−Testing Gas Piping −Extended Period Shutdown−Testing Gas Supply Pressure −Check Manifold Pressure− Proper Gas Flow Approximate − Proper Combustion− High Altitude − Condensate pH Range−Temperature Rise −Flame Signal−External Static Pressure VI−MAINTENANCE −Blower Speed TapsPage Page VII− Wiring and Sequence of Operation Sequence of Operation On Next Heating Sequence of Operation See BOX a LOW Flame Signal YES Normal Operation DS1 and DS2 Simultaneous Slow Flash YESEN or Heat Demand is SATISFIED. a Five Cooling Sequence of Operation Continuous LOW Speed FAN Sequence of Operation Single VIII− Field Wiring Applications and Jumper SettingsTWO Cool Transformer− Both diagnostic lights fail to light up LED#2−Off Miswiring of furnace or improper conDoor interlock switch failure − Diagnostic lights flash the roll−outUous fan demand Primary, secondary or backup secon − Diagnostic lights flash the limit failure modeLED#1−Slow Flash Miswiring of furnace or improper Connections at limit switchesSwitch failure code 2.5 minutes after LED#1−Off Prove switch lines damagedCondensate in prove switch line Prove switch does not close due to aTerminating the unit − Diagnostic lights flash the pressure Switch codeWith a heating demand Installed − After 5 tries the control diagnostics− Roll−out switch trips during − Diagnostic lights flash roll−out failFails to stay lit Operation. Problem is characterized − Combustion air inducer energizesMode Er motor Nostic lights flash low flame sense BurnerLED#1−Slow Flash Sensor rod is contaminatedService Notes

G61MP specifications

Lennox International Inc. has long been a leader in HVAC solutions, and the G61MP gas furnace exemplifies the company's commitment to innovation and energy efficiency. This high-efficiency gas furnace operates with an Annual Fuel Utilization Efficiency (AFUE) of up to 96%, allowing homeowners to save significantly on energy costs while maintaining a comfortable indoor environment.

One of the primary features of the G61MP is its modulating gas valve. This technology enables the furnace to operate at multiple levels of heating output, ensuring that it can adjust its performance according to the home’s heating demands. By modulating the heating output, the G61MP maximizes efficiency and minimizes energy waste, providing a consistent temperature and improved comfort.

The G61MP also incorporates advanced two-stage heating, which enhances its performance by reducing temperature fluctuations in the home. This feature is especially beneficial during transitional weather periods when heating needs may vary widely. With its ability to operate on a lower stage most of the time, the furnace can produce quieter operation and reduced energy consumption.

In terms of design, the G61MP includes a sealed combustion chamber that draws air from outside the home for combustion, enhancing safety and efficiency. This design feature eliminates the need for indoor air, improving indoor air quality. The furnace is also equipped with a high-efficiency ECM blower motor that not only boosts comfort but operates quietly and uses less electricity compared to traditional motors.

Further enhancing its efficiency, the G61MP utilizes a variable-speed blower, which allows for precise control of airflow throughout the home. This results in better humidity control and improved air distribution, providing an overall more comfortable environment.

The Lennox G61MP is compatible with the iComfort S30 smart thermostat, allowing homeowners to control their heating remotely, adjust settings based on their schedules, and access energy usage data. This connectivity transforms the G61MP into an integral part of a smart home ecosystem, facilitating energy conservation and comfort optimization.

Lastly, the G61MP is designed with durability in mind. Its robust construction and high-quality materials ensure reliable performance and lengthy service life. Homeowners can feel assured that they are investing in a heating solution that will meet their needs for many winters to come. In summary, the Lennox G61MP gas furnace stands out with its high efficiency, advanced technology, and user-friendly features, making it a top choice for homeowners seeking exceptional heating performance.