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,1_ 2006 Lennox industries
Inc.
Dallas, Texas, USA
INSTALLATION
INSTRUCTIONS
G50UH(X) Series
GAS FURNACE
505,254M
_
Technical
8/2006
.L_ ._L Publications
Supersedes 504,957M
Lithe U.S.A.
RETAIN THESE
INSTRUCTIONS
FOR FUTURE
REFERENCE
Unit Dimensions
................................
2
G50UH(X) Parts Arrangement
....................
3
G50UH(X) Gas Furnace ..........................
4
Shipping and Packing List ........................
4
Safety Information ...............................
4
General ........................................
5
Combustion, Dilution & Ventilation Air ..............
6
Setting Equipment ...............................
8
Filters ..........................................
12
Duct System ....................................
12
Venting
........................................
12
Gas Piping .....................................
20
Electrical .......................................
21
Unit Start-Up
...................................
25
Gas Pressure Adjustment
........................
26
High Altitude Information
.........................
27
Other Unit Adjustments
..........................
27
Service
........................................
28
Repair Parts List ................................
30
Ignition Control Board Diagnostic Codes
...........
30
Troubleshooting
.................................
31
Start-Up & Performance Check List ................
35
&WARNING
Do not store or use gasoline or other
flammable
vapors and liquids
in the
vicinity
of this
or any
other
ap-
pliance.
Installation
and
service
must
be
performed
by a qualified
installer,
service
agency
or the gas supplier.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical
switch;
do not
use any phone in your building.
• Leave the building
immediately.
• Immediately
call your gas supplier
from a
neighbor's
phone. Follow the gas supplier's
instructions.
• If you cannot
reach your gas supplier,
call
the fire department.
08/06
IIIHIININIIIIIIIIIIIIIIIIIIIIIIIIIIII
Page1
505,254M
IIIHIIIIIIIIIIIIIIIIIIINII
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Related Manuals for Lennox G50UH-36B-090
Summarization of Contents
G50UH(X) Gas Furnace
Shipping and Packing List
Lists items included with the furnace unit.
Safety Information
Crucial safety warnings and precautions for installation and operation.
General Installation Recommendations
General Recommendations
Provides general recommendations for furnace installation placement.
Combustion, Dilution & Ventilation Air
Unconfined Space Air Requirements
Defines requirements for air supply in unconfined spaces.
Confined Space Air Requirements
Defines requirements for air supply in confined spaces.
Return Air Configurations
Upflow Applications - Side Return Air
Details side return air configuration with a filter.
Upflow Applications - Optional Return Air Base
Describes the optional return air base for specific cabinet sizes.
Installation Preparation
Removing the Bottom Panel
Steps to remove the furnace bottom panel.
Leveling an Upflow Unit
Instructions for leveling the furnace in upflow applications.
Horizontal Application Clearances
Provides installation clearances for horizontal applications.
Horizontal Installation Methods
Unit Suspended in Attic or Crawlspace
Details suspending the unit in an attic or crawlspace.
Unit Installed on Platform
Details installing the unit on a platform.
Duct System Requirements
Filters
Filter requirements and sizing for proper operation.
Supply Air Plenum
Requirements for the supply air plenum.
Return Air Plenum
Requirements and safety considerations for the return air plenum.
Gas Piping Installation
Gas Supply Connection
Connects the gas supply to the unit.
Gas Pipe Capacity Recommendations
Table of recommended pipe sizes for gas supply.
Electrical Installation and Safety
Leak Check Procedures
Procedures for checking gas piping connections for leaks.
Electrostatic Discharge (ESD) Precautions
Precautions to protect electronic components from ESD.
Interior Make-Up Box Installation
Instructions for installing the interior make-up box.
Wiring Diagrams and Control Boards
Typical Field Wiring Diagram
Diagram illustrating field wiring connections.
Integrated Control Board Designations
Identifies terminals and DIP switches on the control board.
Unit Start-Up Procedure
Safety Precautions Before Lighting
Critical safety warnings before initiating the unit.
Gas Valve Operation
Instructions for operating the gas valve.
Gas Pressure and Flow Adjustment
Gas Flow Rate Determination
Method to determine gas flow rate using meter readings.
Gas Pressure Checks and Adjustments
Checks and adjustments for gas line and manifold pressure.
Unit Adjustments and Performance
High Altitude Information
Information for installations at altitudes above 4500 feet.
Primary and Secondary Limits
Location and function of primary and secondary limit controls.
Flame Rollout Switches
Location and function of manual reset flame rollout switches.
Pressure Switch Function
Location and function of the combustion air pressure switch.
Temperature Rise Adjustment
Adjusting blower speed to achieve proper temperature rise.
Fan Control Delay Settings
Adjusting fan off delay for heating and cooling modes.
Thermostat Heat Anticipator Setting
Setting the heat anticipator based on control board amp draw.
Service and Maintenance
Flue and Chimney Checks
Checking flue pipe, chimney, and connections for tightness.
Failure To Operate Troubleshooting
Common causes and checks when the unit fails to operate.
Blower Maintenance
Maintenance for the blower wheel and motor.
Filter Maintenance
Filter inspection and replacement procedures.
Electrical Checks
Checking electrical wiring, voltage, and amp-draw.
Heat Exchanger and Burner Cleaning
Procedures for cleaning the heat exchanger and burners.
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