Lennox International Inc G61MP specifications See BOX a LOW Flame Signal YES

Page 42

HEATING SEQUENCE OF OPERATION

CONTINUED

THERMOSTAT CALLS FOR HEAT.

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

FLAME SIGNAL ABOVE

(u0.22 microamps)

NO

SEE BOX A.

LOW FLAME SIGNAL

YES

YES

 

(Does not affect control operation)

DS1 SLOW FLASH, DS2 FAST FLASH.

NO

SINGLE−STAGE THERMOSTAT MODE

 

 

 

TWO STAGE THERMOSTAT MODE

 

 

 

(E20 SET AT

 

 

 

 

 

 

(E20 SET AT

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

START SECOND−STAGE RECOGNITION

 

 

 

 

 

 

45−SECOND INDOOR BLOWER ON DELAY BEGINS.

 

 

ON DELAY (10 OR 15 MINUTES).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIRST−STAGE (LOW FIRE)

 

 

 

 

YES

PRIMARY, SECONDARY, ROLLOUT AND BACKUP

 

 

 

PRESSURE SWITCHES CLOSED?

 

 

 

 

 

 

 

 

SECONDARY LIMIT SWITCHES CLOSED?

 

 

 

YES

 

 

NO

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

 

 

 

GAS VALVE OFF, COMBUSTION AIR INDUCER OFF,

 

 

 

 

FIRST−STAGE HEAT DEMAND SATISFIED?

 

 

 

 

 

 

INDOOR BLOWER ON. DS1 SLOW FLASH, DS2 ON.

 

 

 

 

DS1 AND DS2 SIMULTANEOUS SLOW FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS VALVE OFF, COMBUSTION AIR INDUCER

 

 

 

 

 

 

HAS PRIMARY, SECONDARY, ROLLOUT OR BACKUP

 

 

 

OFF FOLLOWING POST PURGE.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SECONDARY LIMIT SWITCH CLOSED WITHIN 3 MINUTES?

 

INDOOR BLOWER OFF WITH DELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(Indoor blower on low speed during 3−minute period)

 

 

 

DS1 AND DS2 SIMULTANEOUS SLOW FLASH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SECOND−STAGE HEAT DEMAND.

 

 

 

 

 

 

 

 

LIMIT SWITCH WATCHGUARD MODE.

 

 

 

 

SECOND−STAGE HEAT DEMAND REQUIRED?

 

 

 

 

 

 

GAS VALVE OFF, COMBUSTION AIR INDUCER OFF,

 

 

 

 

DS1 AND DS2 SIMUTANEOUS SLOW FLASH.

 

 

 

 

 

 

INDOOR BLOWER OFF WITH DELAY.

 

YES

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 ALTERNATING SLOW FLASH.

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

IS 60−MINUTE RESET PERIOD COMPLETE?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SECOND STAGE PRESSURE SWITCHES CLOSED?

 

 

 

 

 

 

 

 

 

 

 

ABNORMAL FLASH CODE.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

 

 

 

 

NOTE − IF SECOND−STAGE PRESSURE SWITCHES

 

 

 

 

 

 

 

 

WERE ORIGINALLY FOUND CLOSED,

 

 

 

 

INDOOR BLOWER OFF AFTER DELAY.

 

 

 

 

 

 

 

 

 

 

 

 

ABNORMAL CODE WILL FLASH.

 

 

 

 

 

 

 

 

 

DS1 OFF, DS 2 SLOW FLASH.

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SECOND−STAGE PRESSURE SWITCHES CLOSED

 

NO

 

 

 

 

 

 

 

 

 

 

 

AT BEGINNING OF HEAT DEMAND?

 

 

 

 

SECOND−STAGE 30−SECOND DELAY ON BEGINS.

 

 

 

 

 

 

 

DS1 OFF, DS2 SLOW FLASH.

 

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SECOND−STRAGE COMBUSTION AIR INDUCER

 

 

 

 

 

 

 

SECOND STAGE HEAT DEMAND

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS SLOW FLASH.

 

 

 

 

ON. SECOND−STAGE GAS VALVE ON. HIGH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEAT INDOOR BLOWER SPEED ON.

 

 

 

 

 

 

 

NO

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RETURNS TO FIRST−STAGE HEAT MODE WHICH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

CONTINUES UNTIL SECOND−STAGE PRESSURE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCHES CAN BE PROVEN or HEAT DEMAND IS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SECOND−STAGE PRESSURE SWITCHES CLOSED

 

NO

 

 

SATISFIED. FIVE (5) MINUTE WAIT PERIOD

 

 

 

 

IN LESS THAN TEN (10) SECONDS?

 

 

 

 

 

 

INITIATED BEFORE RETRY. WERE 5 ATTEMPTS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

 

 

 

 

 

 

MADE FOR SECOND−STAGE HEAT?

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTINUED ON NEXT PAGE

 

 

 

 

 

 

 

 

 

NORMAL OPERATION.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS SLOW FLASH.

 

 

 

 

YES

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Contents Table of Contents G61MPSpecifications Optional Accessories − Must be Ordered ExtraAfue Direct Vent Blower Data G61MP−36B−045 Performance Less Filter1495 2340 1285 1385 2410 TOP CAP Glass AssemblyG61MP Parts Arrangement Sight Blower−Control Box Control Transformer T1 Door Interlock Switch S51Circuit Breaker CB8 Integrated Control Board A92Page 120VAC Line TWO−STAGE Integrated Control BoardIntegrated Control Board Terminals 120VAC Neutral Integrated Control Board 5 Pin TerminalDS1 DS2 Description −Blower Compartment Blower Motor B3 and Capacitor C4Secondary Limit Controls S21 Supply AIR BlowerBurners Figure −Heating Components Flame SensorIgnitor Ignitor Bracket Burners Front View Burners TOP ViewClamshell Heat Exchanger Flame Rollout Switches S47Combustion Air Inducer Prove Switch S18 Primary Limit Control S10Dual Combustion AIR Prove Switch CAI & Cold END Header BOX AssemblyFirst stage Negative Pressure Second stage Positive Combustion Air Inducer B6 II−PLACEMENT and Installation Outdoor Termination Kits and Corresponding Equivalencies−Vent Piping Guidelines −PVC Joint Cementing Procedure Minimum Vent Pipe LengthsMaximum Vent Pipe Lengths − Venting Practices Upflow or Downflow Direct or NON-DIRECT Vent ApplicationsTypical Exhaust Pipe Connections Reducer Plug Direct Vent applications where combustion air is takenFrom indoors and flue gases are discharged outdoors 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 ApplicationG61MP NON−DIRECT Vent Application Using Existing Chimney Condensate PipingSide View NON−DIRECT Vent Wall Ring Termination Hose clamp Condensate AssemblyVent Nipple TEE Screw Coupling CLEAN−OUT Access −RINGS CAP HI/LO ScrewsFor Your Safety Read Before Operating −Preliminary and Seasonal Checks−Heating Start-Up −Testing Gas Piping −Safety or Emergency ShutdownIV−HEATING System Service Checks A−C.S.A. Certification −Extended Period Shutdown− Proper Gas Flow Approximate −Testing Gas Supply Pressure−Check Manifold Pressure − Proper Combustion− High Altitude − Condensate pH Range−Flame Signal −Temperature Rise−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 VIII− Field Wiring Applications and Jumper Settings SingleTWO Cool TransformerDoor interlock switch failure − Both diagnostic lights fail to light upLED#2−Off Miswiring of furnace or improper con − Diagnostic lights flash the roll−outLED#1−Slow Flash Miswiring of furnace or improper Uous fan demand Primary, secondary or backup secon− Diagnostic lights flash the limit failure mode Connections at limit switchesCondensate in prove switch line Switch failure code 2.5 minutes afterLED#1−Off Prove switch lines damaged Prove switch does not close due to aWith a heating demand Installed Terminating the unit − Diagnostic lights flash the pressureSwitch code − After 5 tries the control diagnosticsFails to stay lit Operation. Problem is characterized − Roll−out switch trips during− Diagnostic lights flash roll−out fail − Combustion air inducer energizesLED#1−Slow Flash Mode Er motorNostic lights flash low flame sense Burner 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.
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