Troubleshooting: Heating Sequence of Operation

HEATING SEQUENCE OF OPERATION

NORMAL AND ABNORMAL HEATING MODE

POWER ON

CONTROL SELF−CHECK OKAY?

POLARITY OKAY?

YES

IS THERE A

PROPER GROUND?

YES

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.

 

INDOOR BLOWER OFF. (RESET CONTROL BY

 

 

 

 

TURNING MAIN POWER OFF.)

 

 

 

 

 

 

NO

POLARITY REVERSED.

 

 

STATUS ERROR CODE 5 + 4.

 

 

 

 

NO

 

 

SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.

 

STATUS ERROR CODE 5 + 3.

 

 

 

NO

A

NORMAL OPERATION:

STATUS LED −− PULSE

B

THERMOSTAT CALLS FOR HEAT:

STATUS LED −− HEARTBEAT

YES

PRIMARY AND SECONDARY LIMIT

SWITCHES CLOSED?

YES

ROLLOUT SWITCH CLOSED?

YES

FIRST (LOW) STAGE PRESSURE SWITCH

CONTACTS OPEN?

YES

SECOND (HIGH) STAGE PRESSURE SWITCH

CONTACTS OPEN?

YES

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER ON. HAS PRIMARY OR

SECONDARY LIMIT RESET WITHIN 3 MINUTES?

STATUS ERROR CODE 3 + 1.

 

 

NO

 

NO

 

 

 

 

60−MINUTE LIMIT WATCHGUARD MODE.

 

 

 

 

GAS VALVE OFF, COMBUSTION AIR INDUCER

 

 

OFF, INDOOR BLOWER OFF WITH DELAY.

 

 

STATUS ERROR CODE 4 + 5.

 

 

 

 

 

NO

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

 

INDOOR BLOWER ON.

 

 

 

 

STATUS ERROR CODE 5 + 1.

 

 

SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS

NO

 

RESET AND MAIN POWER IS INTERRUPTED OR

T’STAT IS CYCLED OFF/ON FOR 3 SEC. MINIMUM.

 

 

 

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF. CONTROL REMAINS UNTIL PRESSURE SWITCH IS DETECTED OPEN. STATUS ERROR CODE 2 + 4

NO

YES

NO

YES

TWO−STAGE OR SINGLE−STAGE THERMOSTAT

CALL FOR HEAT

COMBUSTION AIR INDUCER ON LOW SPEED.

STATUS LED −− HEARTBEAT

GAS VALVE OFF.

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF.

CONTROL WILL NOT ATTEMPT SECOND−STAGE

OPERATION DURING THIS HEAT DEMAND.

FIRST−STAGE OPERATION WILL BE ATTEMPTED.

STATUS ERROR CODE 2 + 6.

CONTINUED ON NEXT PAGE

Page 57

Page 57
Image 57
Lennox International Inc G61MP Series Units, Gas Units Troubleshooting Heating Sequence of Operation, On Next

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.