Lennox LGC048 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 LGC048 Specifications

General

Cooling Capacity	48, 000 BTU/h
Energy Efficiency Ratio (EER)	11.5
Refrigerant Type	R-410A
Compressor Type	Scroll
Voltage	208/230V
Phase	1
Sound Level (Outdoor Unit)	76 dB

Summary

Safety Information

Fire and Explosion Hazards

Warnings about potential fire and explosion risks from improper operation or fuel handling.

Gas Leak Response

Critical steps to follow immediately if a gas smell is detected, including evacuation and contacting authorities.

Unit Operation

Before Lighting Procedures

Essential safety checks and procedures to perform before lighting the unit.

Ignition Sequence Overview

Description of the unit's automatic ignition system and startup process.

Gas Valve Handling

Shutting Off Gas Valve

Instructions for turning off gas valves for different control models.

Turning Off Gas Supply

Procedure for safely shutting off the main gas supply to the furnace.

Performance Checks

Burner Flame Inspection

Guidance on inspecting burner flame appearance for proper operation.

Flue and Vent Inspection

Annual checks of flue passages and vent connections for obstructions.

Routine Servicing and Component Care

Air Filter Servicing

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

Burner Cleaning and Ignition

Steps for cleaning burners and ensuring the ignition electrode is properly set.

Bearing Lubrication

Recommendations for lubricating blower shaft bearings to ensure longevity.

Manifold Pressure Checks

Information on checking and adjusting gas manifold pressures.

Component Servicing

Combustion Air Inducer Cleaning

Procedure for cleaning the combustion air inducer to maintain efficient operation.

Flue Box and Tube Cleaning

Instructions for cleaning internal flue passages and the flue box.

Repair Parts Identification

Guidance on identifying and ordering necessary replacement parts using unit information.