Lennox International Inc G50UH-48C-110 Normalcooling Mode Abnormalcooling Mode, YESl

Page 33

SURELIGHT®CONTROL

COOLINGSEQUENCEOF OPERATION

 

 

 

 

NORMALCOOLING

MODE

 

ABNORMALCOOLING MODE

 

 

 

 

I

 

POWER ON

l

 

 

 

 

 

 

 

 

I

IGNITIONCONTROLMA,POWERON

I

 

 

 

 

 

 

 

I

 

 

 

 

 

 

GAS VALVE OFF, COMBUSTION AIR INDUCER OFR

 

 

ISCONTROL.TOPERATINGO SNORMALLY?O,A .OS ,OO. OK

 

 

 

 

 

 

 

 

 

 

 

INDOOR BLOWER OFF WITH NORMAL DELAY.

 

 

 

 

 

 

 

 

 

SIGNAL CIRCUIT BOARD FAILURE AT LED.

 

 

 

 

 

 

Y sJ

 

INTERRUPT MAIN POWER TO RESET CONTROL,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I

 

 

,sPOLARITYREVERSED? LED_FLASHLEDIFASTSLOWFLASHI2

 

 

 

 

 

 

/

 

 

 

 

 

 

 

LED#1 AND

LED#2

 

 

 

NO

 

 

 

 

 

 

 

ALTERNATING

FAST

I

NO

_

__

I YESJ Is VOLTAGE

_

LED#1 AND LED#2 ALTERNATING FAST

FLASH. SIGNAL

_

 

 

IS THERE

FLASH. SIGNAL HOLDS UNTIL VOLTAGE

I HOLDS UNTIL

UNIT IS I_1

PROPER GROUND? I_IABOVE

75 VOLTS?

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RISES ABOVE

75 VOLTS.

[PROPERLY

GROUND.

I

 

 

 

I

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• NO I GAS VALVE OFF COMBUSTION

AIR INDUCER OFF

 

 

I ROLLOUT

SWITCH

MONITORED

CONTINUOUSLY.

_

INDOOR

BLOWER

OFF WITH

NORMAL

DELAY.

 

 

 

 

IS ROLLOUT SWITCH

CLOSED?

I_--I

SIGNAL

CIRCUIT

BOARD FAILURE

AT LED,

 

 

 

 

 

 

YESl

 

-

ISEQUENCEHOLDS UNTIL ROLLOUT SWITCH CLOSES.

t

I CHECK TO ENSURE GAS VALVE IS DE-ENERGIZED.

S GAS VALVE OFF?

I LED:SLOWTHROUGHOUTFLASHRATEREMAINSUNCHANGEDCOOLING CYCLE. I

I

THERMOSTAT CALLS FOR COOLING.

I

COMPRESSOR CONTACTOR IS ENERGIZED,

INDOOR BLOWER ON COOL SPEED AND EAC

TERM NAL S ENERG ZED AFTER 2-SECOND DELAY,

I

I

I

THERMOSTAT OPENS.

I

COMPRESSOR

OFF.

I

SYSTEM FAN AND EAC

TERM, OFF

I

WITH 2 OR 45-SECOND

DELAY,

I

Page 33

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Contents G50UHX Series Supply AIR FlueBoxGasket HeatExchanger FlueCollectorBox Gasket FlueTransitionPackage 1 of 1 contains Wheninstalled,thisfurnacemustbeelectricallygrounded Acaution Canada,referto the standardCSAB149installation codesAir from Inside WiTER/ RoomEquipment in Confined Space ALL AIR from Outside Mm at unit front. The unit must be levelSide View Front View 27-5/8Removingthe Bottom Panel Leveling Bolt Installation Inches mmRemoving the Bottom Panel Leveling an Upflow UnitHorizontal Application Unit Installed on Platform Supply Air Plenum Filter SizeCombustion Air Inducer HoleOutletopeningSeefigure15 Venting Using a Masonry ChimneyThelatesteditionof NationalFuelGasCodeNFPA54 Vent ConnectionCombined Vent Connector Common Venting Using Tile-Lined Interior Masonry ChimneSingle appliance Minimum Vent capacityMaximum Horizontal Inches mm MIN MAX Serving a Single Category I Appliance Serving Two or More Category I Appliances Type B Double-WallVents with Type B Double-Wall ConnectorsRemoval of the Furnace from Common Vent VentGas Pipe Capacity ft3/hr m3/hr PropaneInstallationCodesinCanadaInterior MAKE-UP BOX Installation Precautions and ProceduresLeak Check Electrostatic Discharge ESDINTERIORMAKE-UP BOX Installation PowER @1HsuN,TZk for Correct Number of Secondary Typical G50UHX Field Wiring DiagramSot G5OUHXManifold For Your Safety Read Before LightingRevolution Honeywell VR8205 Gas Valve with ON/OFF SwitchPrimary and Secondary Limits FlueAnd Chimney CheckunitforproperdraftG50UHX Burner & Heat Exchanger Removal Ak Caution Diagnostic Surelight Control Normal Heating Mode Abnormal Heating ModeYESl =-lYESl Normalcooling Mode Abnormalcooling ModeYEs FurnaceBtuInput BlowerMotorAmps

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.
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