Lennox LGC072 User Manual

10/08
*2P1008*
504,875M
*P504875M*
LGA/LGC036, 042, 048, 060, 072
LGA/LGC090, 102, 120, 150,
LGA/LGC156, 180, 210, 240, 300S
LGA/LGC248, 300H, 360
©2006
Litho U.S.A.
504,875M
10/2008
Supersedes 1/2006
WHAT TO DO IF YOU SMELL GAS:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings ex-
actly could result in serious injury
death or property damage.
WARNING
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Installation and service must be per-
formed by a qualified installer, ser-
vice agency or the gas supplier.
D Do not try to light any appliance.
D Do not touch any electrical switch; do not
use any phone in your building.
D Immediately call your gas supplier from a
neighbor’s phone. Follow the gas suppli-
er’s instructions.
D If you cannot reach your gas supplier, call
the fire department.
D Extinguish any open flames.
ROOFTOP
UNITS
READ ALL INSTRUCTIONS IN THIS MANUAL
AND RETAIN FOR FUTURE REFERENCE
LGA240 SHOWN
See unit nameplate for manufacturer
and address.
FBR113270
(3, 3−1/2, 4, 5, and 6 TONS)
(7−1/2, 8-1/2, 10, and 12-1/2 TONS)
(13, 15, 17-1/2, 20, and 25 TONS)
(20, 25, and 30 TONS)
D Leave the building immediately.

Lennox LGC072 Specifications

General

Brand	Lennox
Model	LGC072
Category	Air Conditioner
Language	English

Summary

Parts Arrangement for LGA/LGC036-072

Parts Arrangement for LGA/LGC090-150

Parts Arrangement for LGA/LGC156-300S

Parts Arrangement for LGA/LGC248-360

Safety Information

General Safety Warnings

Covers explosion, fire, electrical shock, and fiberglass wool hazards.

Unit Operation Safety

Details safety precautions for lighting and operating the unit, including gas leak procedures.

Unit Operation and Gas Valve Handling

Placing Unit Into Operation

Step-by-step instructions for starting the furnace, including gas valve operation.

Turning Off Gas to Furnace

Procedure for safely shutting off the gas supply to the furnace before service.

Maintenance and Inspection

Burner Flame Inspection

Guidance on inspecting burner flame for proper operation and identifying issues.

Flue Passage and Vent Inspection

Instructions for annual inspection of flue passages and vent components.

Service Requirements

Highlights the necessity of yearly servicing by a qualified technician for efficiency and warranty.

Component Servicing

Servicing Filter

Procedure for checking and replacing air filters based on unit model and size.

Burner Cleaning

Steps for cleaning burners, including removal, cleaning, and reinstallation.

Lubrication

Information on lubricating blower shaft bearings every two years with specific grease types.

Manifold Pressures

Reference to tables and figures for locating manifold pressure ports.

Component Maintenance and Troubleshooting

Combustion Air Inducer

Procedures for cleaning the combustion air inducer and its components.

Flue Passageway and Flue Box

Instructions for cleaning the flue box and heat exchanger tubes.

Service Reminder

Checklist of basic troubleshooting steps before calling a service technician.

Repair Parts Listing

Information on how to order repair parts, including required model and serial numbers.