HEATING SEQUENCE OF OPERATION

CONTINUED

THERMOSTAT CALLS FOR HEAT

DS1 AND DS2 SIMULTANEOUS FAST FLASH

(Refer to box A on previous page)

FIRST−STAGE (LOW FIRE) PRESSURE

 

 

 

NO

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SWITCH CLOSED WITHIN 2.5 MINUTES?

 

 

 

 

 

 

OFF. INDOOR BLOWER OFF. UNIT WILL RETRY

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

AFTER 5−MINUTE WAIT PERIOD.

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 OFF, DS2 SLOW FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15−SECOND COMBUSTION AIR INDUCER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRE−PURGE INITIATED BY CLOSED FIRST−STAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRESSURE SWITCH (or 15 SECOND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INTER−PURGE PERIOD.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IGNITOR WARM−UP (20 SECONDS)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

COMBUSTION AIR INDUCER OFF, IGNITER OFF.

 

 

 

 

 

 

 

 

IS VOLTAGE ABOVE 75 VOLTS?

 

 

 

 

 

 

SIGNAL HOLDS UNTIL VOLTAGE RISES ABOVE 75 VOLTS.

 

 

 

YES

 

 

 

 

 

 

 

 

DS1 AND DS2 ALTERNATING FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

COMBUSTION AIR INDUCER OFF, IGNITER OFF.

 

 

 

 

 

 

 

 

IS THERE A PROPER GROUND?

 

 

 

 

 

 

 

 

 

 

SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 ALTERNATING FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

COMBUSTION AIR INDUCER OFF, IGNITOR OFF.

 

 

IS IGNITOR INTACT AND CONNECTED?

 

 

 

 

 

 

 

 

 

SIGNAL HOLDS UNTIL IGNITOR IS REPLACED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OR RECONNECTED.

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

DS1 AND DS2 ALTERNATING FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AT END OF IGNITOR 20 SECOND WARM UP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PERIOD, 4−SECOND TRIAL FOR IGNITION.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS VALVE OPENS, IGNITOR ENERGIZED DURING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4−SECOND TRIAL UNTIL FLAME SENSED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4−SECOND FLAME STABILIZATION PERIOD.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 SIMULTANEOUS FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS VALVE OFF. COMBUSTION AIR

 

 

 

 

 

 

FLAME RECTIFICATION CURRENT CHECK

 

 

 

 

 

 

INDUCER ON. INDOOR BLOWER OFF.

 

 

 

 

 

 

CAN FLAME BE PROVEN WITHIN 4

 

 

 

NO

 

 

DS1 SLOW FLASH, DS2 FAST FLASHN.

 

NO

 

SECONDS AFTER GAS VALVE OPENS?

 

 

 

 

 

 

HAS CONTROL FAILED TO SENSE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(u0.16 microamps)

 

 

 

 

 

 

FLAME FOR FIVE CONSECUTIVE TRIES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DURING A SINGLE HEAT DEMAND?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WATCHGUARD MODE. GAS VALVE OFF,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COMBUSTION AIR INDUCER OFF.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INDOOR BLOWER OFF.

 

 

YES

 

 

 

 

 

 

 

 

 

 

DS1 AND DS2 ALTERNATING SLOW FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

IS 60−MINUTE RESET PERIOD COMPLETE?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

FLAME PRESENT?

 

 

 

HAS CONTROL RESET IGNITION SEQUENCE

 

 

NO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FOUR (4) TIMES?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

DS1 SLOW FLASH, DS2 FAST FLASH.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONTINUED ON NEXT PAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 41

Page 41
Image 41
Lennox International Inc G61MP specifications Heating Sequence of Operation

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.