Lennox International Inc G50UH-24A-045, G50UH-48C-110, G50UH-60D-135, G50UH-36C-110 =-l, YESl

Page 32

NORMAL HEATING MODE

ABNORMAL HEATING MODE

15-SECOND COMBUSTION AIR INDUCER PREPURGE N T ATED BY CLOSED PRESSURE SW TCH.

YES _

IIGNITOR WARM-UP -- 20 SECONDS. YES

GAS VALVE OPENS, IGNITOR ENERGIZED FOR

I4-SECONDUP TOTRIAL4SECONDS,FORIGNITION.

9

 

 

-_O

S VOLTAGE ABOVE 75 VOLTS?

. NO I LEDS SIGNAL

 

YES_

 

 

ALTERNATING

_IIW

YES_t

INO FAST FLASH

ISTHERE A PROPER GROUND?

I--=-_l

ISIGNITOR INTACT AND CONNECTED?I_"I

YES

IFLAME STABILIZATION PERIOD.

4 SECONDS

FLAME RECTIFICATION CURRENT

CHECK. CAN FLAME BE PROVEN WITHIN 4 SECONDS AFTER GAS VALVE OPENS?

( > 0.24 microamps)

YES _

FLAME PRESENT?

YES _

IFLAME SIGNAL ABOVE 0.31 MICROAMPS? YES _

IINDOOR BLOWER ON DELAY BEGINS

(45 seconds,)

YES _1

PRIMARYSWITCHESANDSECONDARYCLOSED? LIMIT

I

I

I_

I

-

I

F-

 

 

INDOOR

BLOWER

OFF.

FOR

I

NO

 

HAS CONTROL

FA LED TO SENSE FLAME

 

 

FIVE CONSECUTIVE TRIES DURING A SINGLE

 

 

 

 

HEAT DEMAND?

 

 

 

 

 

 

 

 

t

 

 

 

 

 

COMBUSTION

AIR INDUCER OFF.

 

 

 

GAS VALVE OFF. COMBUSTION AIR INDUCER ON.

 

 

 

INDOOR BLOWER

OFF WITH DELAY

 

 

YES

 

IGNITION

WATCHGUARD

MODE. GAS VALVE OFF. I

 

LED 1 ALT. SLOW

FLASH

LED 2 ALT SLOW

FLASH

I

I

 

IS 60-MINUTE

RESET

PERIOD COMPLETE?

I,.__

I

 

 

 

 

 

 

 

 

_,Z_.I_

 

HASCONTROLRESET,GN,T,ON

NO

 

 

 

 

 

 

 

 

 

I

 

SEQUENCE

 

FOUR

TIMES?

 

/

Ii

 

 

 

 

 

LOW FLAME SIGNAL

 

YESl

 

 

LED #1 -- SLOW

FLASH

 

 

I

(Does not affect operation of control)

 

 

 

LED #2 -- FAST FLASH

 

LIMIT SWITCH WATCH-

 

 

 

 

 

 

 

 

 

 

 

 

 

GUARD MODE. GAS

 

GAS VALVE DE-ENERGIZED

 

VALVE OFF. COMB. AIR

 

COMBUSTION

AIR INDUCER

 

INDUCER OFF. INDOOR

 

DE-ENERGIZED.INDOOR

 

BLOWER

BLOWER

OFF WITH

ON UNTIL

SWITCH

CLOSES.LED

#1

DELAY, LED#I-SLOW

 

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

FLASH LED#2 - ON. IS

YES

IROLLOUT SWITCH CLOSED?

q

YES _

÷1 COMBUSTION AIR PRESSURE SWITCH CLOSED?

YES _

I

THERMOSTAT DEMAND

SATISFIED.

I

 

YES

 

 

I

LED #1 & #2 SIMULTANEOUS

SLOW FLASHES.

I

YES _

COMB. AIR INDUCER CONTINUES 5-SECOND POST PURGE AFTER T'STATDEMAND IS SATISFIED, INDOOR AIR BLOWER COMPLETES SELECTED "OFF"

DELAY BEFORE SHUTTING OFF.

 

IS LIMIT SWITCH CLOSED?

60MINUTE RESET

 

 

 

PERIOD COMPLETE?

 

YES

 

 

 

HAS PRIMARY/SECONDARY

LIMIT

 

RESET (CLOSED)

WITHIN

3

 

MINUTES?

YES

 

 

NO

GAS VALVE

POWER OFR

 

COMBUSTION AIR INDUCER POWER OFF.

 

INDOOR BLOWER OFF WITH DELAY

 

LED #1 --

ON. LED #2 -- SLOW FLASH,

SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS RESET

YES

 

COMBUSTION

AIR INDUCER

ON.

YES

 

INDOOR BLOWER OFF WITH DELAY

 

 

I

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

 

GAS VALVE DE-ENERGIZED

MINUTES?

 

 

HAS CAB SWITCH

CLOSED IN 2.5

 

NO_

I 5-MINUTEWATCHGUARDPRESSUREMODE,SWITCH ]

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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 ViewLeveling Bolt Installation Inches mm Removingthe Bottom PanelRemoving the Bottom Panel Leveling an Upflow UnitHorizontal Application Unit Installed on Platform Filter Size Supply Air PlenumCombustion Air Inducer HoleVenting Using a Masonry Chimney OutletopeningSeefigure15Thelatesteditionof NationalFuelGasCodeNFPA54 Vent ConnectionCommon Venting Using Tile-Lined Interior Masonry Chimne Combined Vent ConnectorSingle appliance 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/hrPrecautions and Procedures Interior MAKE-UP BOX InstallationLeak Check 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 G50UHX Burner & Heat Exchanger Removal FlueAnd ChimneyCheckunitforproperdraft 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.