Lennox International Inc G50UH-60D-155, G50UH-48C-110, G50UH-60D-135, G50UH-36C-110 Diagnostic

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ThefollowingrepairpartsareavailablethroughLennoxdealersWhenorderingparts,includethecompletefurnacemodel. numberlistedontheCSAInternationalnameplate--Example:G50UH(X)-24A-045-8,

CabinetParts

 

 

 

 

HeatingParts

 

Upperaccesspanel

 

 

 

 

FlameSensor

 

Blowerpanel

 

 

 

 

 

Heatexchangerassembly

 

Topcap

 

 

 

 

 

 

 

 

 

 

 

Gasmanifold

 

ControlPanelParts

 

 

 

 

 

Combustionairinducer

 

Transformer

 

 

 

 

 

Gasvalve

 

SureLight® ignitionboard

 

 

 

 

Mainburnercluster

 

Doorinterlockswitch

 

 

 

 

Mainburnerorifices

 

Circuitbreaker

 

 

 

 

 

Pressureswitch

 

BlowerParts

 

 

 

 

 

Ignitor

 

Blowerwheel

 

 

 

 

 

Primarylimitcontrol

 

Motor

 

 

 

 

 

Flamerolloutswitch

 

Motormountingframe

 

 

 

 

Secondarylimit(notusedon24A-45-1)

Motorcapacitor

 

 

 

 

 

 

 

 

Blowerhousingcutoffplate

 

 

 

 

 

 

 

 

 

 

DIAGNOSTIC

CODES

 

 

 

 

 

Make sure to Identify LED'SCorrectly.

 

 

 

Refer to Installation Instructions for control board layout,

 

DSl

DS2

 

 

 

 

 

DESCRIPTION

 

(Red or

Green)

(Green)

 

 

 

 

 

 

 

SIMULTANEOUS

SIMULTANEOUS

Power on -- Normal operation.

 

 

SLOW FLASH

SLOW FLASH

Also signaled during cooling and continuous fan.

 

SIMULTANEOUS

SIMULTANEOUS

Normal operation -- Signaled when heating demand initiated at thermostat.

FAST FLASH

FAST FLASH

 

 

 

 

 

 

 

SLOW

FLASH

ON

Primary or secondary

limit switch open. Limit must close within

3 minutes or unit

 

 

 

goes into 1-hour Watchguard.

 

 

 

 

 

Pressure switch open;

 

 

 

OFF

SLOW FLASH

OR: Blocked

inlet/exhaust vent;

 

OR: Condensate line blocked;

 

 

 

 

 

 

 

 

 

 

OR: Pressure switch closed prior to activation of combustion air inducer.

ALTERNATING

ALTERNATING

Watchguard

-- Burners failed to ignite, limit open longer than 3 minutes, or flame

SLOW FLASH

SLOW FLASH

sense

lost 5 times in one heating cycle.

 

SLOW

FLASH

OFF

Flame

sensed

without

gas valve energized.

 

ON

SLOW FLASH

Rollout

switch

open.

 

 

 

ON

ON

 

 

 

 

 

 

 

ON

OFF

Circuit board failure or control

wired incorrectly. Check 24-volt and 115-volt

connections

to

board.

 

 

 

OFF

ON

 

 

 

 

 

 

 

 

 

 

FAST

FLASH

SLOW FLASH

Main power

polarity reversed.

Switch line and neutral. Improper

main ground.

SLOW

FLASH

FAST FLASH

Low flame signal. Check flame

sensor.

 

 

 

 

The following conditions are sensed during the ignitor warm-up period only:

ALTERNATING

ALTERNATING

1) Improper

main ground;

 

 

FAST FLASH

FAST FLASH

2) Broken ignitor; OR: Open ignitor circuit;

 

 

 

 

3) Line voltage below 75 volts.

 

 

NOTE - Slow flash rate equals 1 Hz (one flash per second). Fast flash rate equals 3 Hz (three flashes per second). Drop out flame sense current = 0.15 - 0.24 microAmps.

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Contents G50UHX Series Supply AIR Gasket FlueTransition FlueBoxGasket HeatExchanger FlueCollectorBoxPackage 1 of 1 contains Wheninstalled,thisfurnacemustbeelectricallygrounded Canada,referto the standardCSAB149installation codes AcautionWiTER/ Room Air from InsideMm at unit front. The unit must be level Equipment in Confined Space ALL AIR from Outside27-5/8 Side View Front ViewRemoving the Bottom Panel Leveling Bolt Installation Inches mmRemovingthe Bottom Panel Leveling an Upflow UnitHorizontal Application Unit Installed on Platform Combustion Air Inducer Filter SizeSupply Air Plenum HoleThelatesteditionof NationalFuelGasCodeNFPA54 Venting Using a Masonry ChimneyOutletopeningSeefigure15 Vent ConnectionSingle appliance Common Venting Using Tile-Lined Interior Masonry ChimneCombined Vent Connector Minimum Vent capacityMaximum Horizontal Inches mm MIN MAX Serving a Single Category I Appliance Type B Double-WallVents with Type B Double-Wall Connectors Serving Two or More Category I AppliancesVent Removal of the Furnace from Common VentPropaneInstallationCodesinCanada Gas Pipe Capacity ft3/hr m3/hrLeak Check Precautions and ProceduresInterior MAKE-UP BOX Installation Electrostatic Discharge ESDPowER @1HsuN,T INTERIORMAKE-UP BOX InstallationTypical G50UHX Field Wiring Diagram Zk for Correct Number of SecondaryG5OUHX SotFor Your Safety Read Before Lighting ManifoldHoneywell VR8205 Gas Valve with ON/OFF Switch RevolutionPrimary and Secondary Limits FlueAnd Chimney CheckunitforproperdraftG50UHX Burner & Heat Exchanger Removal Ak Caution Diagnostic Normal Heating Mode Abnormal Heating Mode Surelight Control=-l YESlNormalcooling Mode Abnormalcooling Mode YESlYEs BlowerMotorAmps FurnaceBtuInput

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.