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Lennox G43UF User Manual

Lennox G43UF
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G A S F U R N A C E S
G43UF
MERIT
®
SERIES
Up−Flow
E N G I N E E R I N G D A T A Bulletin No. 210394
August 2005
Supersedes December 2004
AFUE − up to 92.1%
Input − 44,000 to 132,000 Btuh
Nominal Add−on Cooling − 2 to 5 Tons
MODEL NUMBER IDENTIFICATION
G 43 24−B 045
Unit Type
G = Gas Furnace
Series
43 = 90% Minimum AFUE
Nominal Add−On Cooling Capacity
24 = 2 tons (7.0 kW)
36 = 3 tons (10.5 kW)
48 = 4 tons (14.10 kW)
60 = 5 tons (17.5 kW)
1
Cabinet Width
B = 17−1/2 in. (445 mm)
C = 21 in. (533 mm)
D = 24−1/2 in. (622 mm)
Nominal Gas Heat Input
045 = 44,000 Btuh (12.9 kW)
070 = 66,000 Btuh (19.3 kW)
090 = 88,000 Btuh (25.8 kW)
110 = 110,000 Btuh (32.2 kW)
135 = 132,000 Btuh (38.7 kW)
1
Indoor coils with the same letter designation
will physically match the furnace.
UF
Configuration
UF = Up−Flow

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Lennox G43UF Specifications

General IconGeneral
Heating StagesSingle-stage
Blower MotorPSC
Ignition SystemHot Surface Ignition
Gas ValveSingle-stage
Cabinet Width17.5 inches
Fuel TypeNatural Gas or Propane
Cabinet TypeUpflow/Horizontal
Ignition TypeHot Surface Ignition
Heating Capacity44, 000-132, 000 BTUH
Warranty5-Year Limited Warranty on covered components

Summary

MODEL NUMBER IDENTIFICATION

FEATURES

WARRANTY

Details limited warranty for heat exchanger and other components.

APPROVALS

Lists certifications and standards met by the units.

APPLICATIONS

Describes unit capabilities, cabinet features, and installation flexibility.

DIRECT VENT / NON-DIRECT VENT

Explains furnace installation types and venting.

Termination Kits

Lists termination kits for venting installations.

HEATING SYSTEM

Lennox Duralok Plus® Heat Exchanger Assembly

Primary heat exchanger and secondary condenser coil assembly details.

Lennox Designed Header Box

Explains the header box for flue condensate collection and disposal.

Lennox Designed Flue Condensate Trap Assembly

Details the condensate trap assembly location and connections.

Inshot Burners

Describes the inshot burners, their operation, and serviceability.

Hot Surface Mini-Nitride Ignitor

Covers the ignitor material, life, and operation.

Gas Control Valve

Details the 24-volt redundant combination gas control valve.

Combustion Air Inducer

Explains the inducer blower's function in purging and venting.

Pressure switch

Describes the pressure switch's role in proving blower operation.

Limit Control

Explains the automatic reset primary limit control.

Flame Rollout Switch

Details the manual reset rollout switch for protection.

OPTIONS

High Altitude Orifice Kit

Kit for proper operation at higher altitudes.

High Altitude Pressure Switch Kit

Kit for proper operation above 4,500 ft.

LPG/Propane Conversion Kit

Kit for changing from natural gas to LPG/Propane.

CONTROLS

Integrated Furnace Control Board

Describes the solid-state board and its functions.

Accessory Terminals

Explains the use of accessory terminals for add-ons.

24 Volt Transformer

Details the furnished 24-volt transformer.

Field Wiring Make-up Box

Describes the box for line voltage wiring.

BLOWER

Multi-speed, direct drive blower

Describes the blower motor and its mounting.

FILTER (NOT FURNISHED)

Air Filter and Rack Kit

Details filter provisions and rack kits for side return.

EZ Filter Base

Describes the EZ filter base for bottom return air.

CABINET

Low-profile, narrow width cabinet

Describes the cabinet construction, insulation, and access features.

Return Air Entry

Coil Match-up

OPTIONS

Condensate Drain Heat Cable Kits

Lists optional accessories like condensate drain heat cable kits.

Condensate Trap Alternate Location Kit

Allows condensate drain installation on the opposite side.

RAB Return Air Base

Required for certain side return air configurations.

SPECIFICATIONS

Gas Heating Performance

Details input, output, and temperature rise for each model.

Connections

Lists pipe sizes and types for various connections.

Indoor Blower

Provides details on blower wheel, motor, and cooling capacity.

Shipping Data

Lists shipping weight and electrical characteristics.

OPTIONAL ACCESSORIES

FILTER KITS

Lists available filter and rack kits by model width.

CABINET ACCESSORIES

Lists bases and frames for furnace installation.

CONDENSATE DRAIN KITS

Details heat cable and tape kits for condensate lines.

CONTROLS

Lists twinning kits for operating multiple furnaces.

TERMINATION KITS

Lists various kits for direct and non-direct vent applications.

GAS HEAT ACCESSORIES

Lists kits for high altitude and fuel conversion.

EXHAUST PIPE VENTING

Maximum Equivalent Vent Length

Table showing vent length limits based on altitude and pipe size.

Termination Kits - Equivalent Vent Lengths

Table detailing vent lengths for various termination kits.

FILTER AIR RESISTANCE

HIGH ALTITUDE INFORMATION

INSTALLATION CLEARANCES

INSTALLATION CONFIGURATIONS

DIMENSIONS

Furnace Dimensions

Diagram and table showing overall furnace dimensions (A, B, C).

Air Openings

Details supply and return air opening locations and sizes.

OPTIONAL ACCESSORY DIMENSIONS

RAB Return Air Base

Dimensions for the RAB base for up-flow applications.

Furnace/Coil Combined Dimensions

Table showing combined dimensions for furnace and coil units.

OPTIONAL ACCESSORY DIMENSIONS

Concentric Termination Kits

Dimensions and diagrams for concentric wall and roof termination kits.

Wall Assembly Termination Kit - Ring Kit

Dimensions and diagrams for the wall ring termination kit.

OPTIONAL ACCESSORY DIMENSIONS

Close-Couple Wall Termination Kits

Dimensions and diagrams for close-couple wall termination kits.

WTK Wall Assembly Termination Kit

Dimensions and diagrams for WTK wall assembly kits.

BLOWER/WATTS DATA

G43UF-24B-045 PERFORMANCE

Blower/watts data for the 24B-045 model.

G43UF-24B-070 PERFORMANCE

Blower/watts data for the 24B-070 model.

G43UF-36B-070 PERFORMANCE

Blower/watts data for the 36B-070 model.

G43UF-36C-090(H) PERFORMANCE

Blower/watts data for the 36C-090(H) model.

BLOWER/WATTS DATA

G43UF-36C-090 PERFORMANCE

Blower/watts data for the 36C-090 model.

G43UF-48C-090 PERFORMANCE

Blower/watts data for the 48C-090 model.

G43UF-48C-110 PERFORMANCE

Blower/watts data for the 48C-110 model.

G43UF-60C-110 PERFORMANCE

Blower/watts data for the 60C-110 model.

G43UF-60C-110 PERFORMANCE (Bottom Return Air)

Blower/watts data for 60C-110 with bottom return.

G43UF-60D-135 PERFORMANCE

Blower/watts data for the 60D-135 model.

BLOWER/WATTS DATA

G43UF-60D-135 PERFORMANCE (Single Side Return Air)

Blower/watts data for 60D-135 with single side return.

G43UF-60D-135 PERFORMANCE (Bottom Return Air)

Blower/watts data for 60D-135 with bottom return.

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