SURELIGHT® CONTROL

HEATING SEQUENCE OF OPERATION

 

 

NORMAL HEATING MODE

 

 

 

 

ABNORMAL HEATING MODE

 

 

 

I

POWER ON

]

 

 

I

 

GAS VALVE OFF. COMBUSTION

AIR INDUCER

ON.

 

 

 

_'

 

 

 

I

 

 

INDOOR BLOWER ON.

 

 

 

CONTROL SELF-CHECK OKAY'_

 

I,_

_

 

LED #1 ALTERNATING

FAST FLASH

 

 

I

 

 

"

 

; NO

 

LED#2 ALTERNATING

FAST FLASH

 

 

 

 

I

 

 

 

 

CHECK FOR BROKEN IGNITOR OR

 

 

 

 

 

 

 

 

-I

 

GAS VALVE OFF. COMBUSTION

AIR INDUCER

OFF.

 

 

 

v

 

 

aYES _

I

 

INDOOR BLOWER DELAY OFF.

 

 

 

,sPOLARITYREVERSED?

_1

 

 

 

LED#1ON

 

 

I

 

 

 

 

i- I

I

I

 

 

LED #2 ON

 

 

 

 

I

I NO

 

 

/I

 

I

(R__

 

TURNING

MAIN POWER

OFF)

LED#1

AND LED#2

 

 

 

/

 

 

 

 

 

 

 

ALTERNATING

FAST

J_

 

 

1'

 

 

_

 

POLARITY REVERSED.

 

FLASH,

SIGNAL

NO

I YESI

 

 

 

 

I

 

LED #1 -- FAST FLASH

 

HOLDS UNTIL UNIT IS ._--I

ISTHERE

ISVOLTAGE

 

I NO I

 

LED #2 -- SLOW FLASH

 

PROPERLY GROUNDi_I

PROPER GROUND?

_

ABOVE

75 VOLTS?

I_-----'

I

 

 

 

--

'

 

YES/

 

 

 

II _I LED#1ANDLED#2ALTERNATINGFAST

 

_I

 

 

 

NO

 

 

I'--ml FLASH. SIGNAL HOLDS UNTIL VOLTAGE I

 

ROLLOUT SWITCH CLOSED?

 

_

 

 

I_ I

 

RISES ABOVE

75 VOLTS.

I

 

 

 

YESi

 

 

 

in,--

 

 

 

 

 

 

 

 

 

 

I1"I"1

GAS VALVE OFF. COMBUSTION

AIR INDUCER

OFF.

 

 

 

'_

 

 

 

_1

 

INDOOR BLOWER OFF WITH DELAY.

 

 

 

 

GAS VALVE

 

 

I

I

 

LED #1 -- ON. LED #2 -- SLOW FLASH,

 

 

I

 

DE-ENERGIZED?

 

 

I

ISEQUENCE

HOLDS UNTIL ROLLOUT SWITCH CLOSES.

YEs_

 

LED #1 -- SLOW FLASH

 

 

NORMAL

OPERATION:

I

 

LED #2 -- SLOW FLASH

 

I

THERMOSTAT

CALLS

FOR HEAT:

I

LED #1 -- FAST FLASH

I

LED #2 -- FAST FLASH

i

YES

 

 

 

IS COMBUSTION

AIR

I

PRESSURE

SWITCH

OPEN?

14

YES _1

I IS(HUMCOMBUSTIONTERMINAL AIRIS ENERGIZEDINDUCER ENERGIZED?WITHC.A. .) 4

NO

COMBUSTION AIR INDUCER OFF.

INDOOR BLOWER OFF WITH DELAY.

LED #1 OFF

LED #2 SLOW FLASH

GAS VALVE OFF.

(Sequence holds until pressure switch closes or thermostat resets control,)

 

HASSWITCHCOMBUSTIONCLOSED INAIR2.5 PRESSUREMINUTES?

1_

 

 

 

YES

 

I

 

15-SECOND COMBUSTION

AIR INDUCER PREPURGE

N T ATED BY CLOSED

PRESSURE SW TCH.

I

 

 

 

m

 

YES

 

 

 

CONTINUED

NEXT PAGE

 

PRESSURE SWITCH IS IN WATCHGUARD MODE. GAS VALVE OFF. COMBUSTION AIR INDUCER OFF. INDOOR BLOWER OFF WITH DELAY,

LED #1 -- OFF. LED #2 -- SLOW FLASH,

IS 5-MINUTE RESET PERIOD COMPLETE?

Page 31

Page 31
Image 31
Lennox International Inc G50UH-36A-070, G50UH-48C-110 Surelight Control, Normal Heating Mode Abnormal Heating Mode

G50UH-60D-155, G50UH-36B-090, G50UH-36A-070, G50UH-24A-045, G50UH-60D-135 specifications

Lennox International Inc is renowned for its high-quality heating, ventilation, and air conditioning (HVAC) solutions. Among its versatile product lineup are the G50UH series of gas furnaces, which exemplify efficiency and performance. These models, specifically the G50UH-24A-070, G50UH-24A-045, G50UH-36B-090, G50UH-36A-070, and G50UH-48C-135, offer a range of features tailored to meet varying residential heating demands.

One of the key features of the G50UH series is its energy efficiency. Many models in this lineup boast an impressive Annual Fuel Utilization Efficiency (AFUE) rating, which indicates their ability to convert fuel into usable heat efficiently. These high AFUE ratings can lead to significant savings on energy bills, making these furnaces a cost-effective choice for homeowners.

The G50UH series incorporates advanced technology, including multi-speed blowers that enhance comfort levels. This feature allows for better airflow control and can help maintain consistent temperatures throughout the home. The controlled airflow reduces temperature swings and ensures that every room benefits from the heating provided by the furnace.

Safety is paramount in Lennox designs, and the G50UH series is no exception. Each unit is equipped with safety features designed to protect both the furnace and the home. Dual certification ensures that the products meet stringent safety standards. Moreover, features like a self-diagnostic control board streamline maintenance, allowing homeowners to easily identify potential issues.

Another important characteristic of the G50UH series is its compact design, which is beneficial for homes with limited space. The units are designed to fit comfortably in various installation environments, from basements to utility rooms.

Durability is another hallmark of the G50UH furnaces. Constructed with quality materials, these units are designed for long-term reliability. This ensures that homeowners can enjoy the comfort of their heating systems without frequent repairs.

Lastly, Lennox provides extensive support and warranties, giving homeowners peace of mind associated with their purchase. With options tailored to meet diverse home heating needs, the Lennox G50UH series stands out in the HVAC market, combining efficiency, safety, and reliability in one impressive package.