Lennox LGA048 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 LGA048 Specifications

General

Refrigerant Type	R-410A
Compressor Type	Scroll
Voltage	208/230V
Phase	1
Cooling Capacity	48000 BTU/h
Sound Level (Outdoor Unit)	76 dB

Summary

General Safety Warnings

Fire or Explosion Hazard Warning

Failure to follow safety warnings could result in serious injury, death, or property damage.

Gas Leak Emergency Procedure

Steps to take if you smell gas, including evacuation and contacting gas supplier.

Safety Precautions

Combustible Materials and Airflow

Keep unit area clear of combustibles and ensure unobstructed airflow.

Electrical and Installation Hazards

Warnings regarding electrical shock, improper installation, and wet furnaces.

Fiberglass Wool Exposure

Information and precautions regarding exposure to fiberglass wool insulation.

Unit Operation and Lighting

Safety Before Lighting

Perform pre-lighting checks and follow safe operating procedures.

Ignition System and Controls

Description of the automatic spark ignition and reset procedures.

Gas Valve Operation Procedures

Detailed steps for operating various gas valve models and troubleshooting.

Turning Off Gas Supply

Procedure for safely turning off the gas supply to the furnace.

Maintenance and Servicing

Burner Flame Inspection

Guidelines for inspecting burner flame characteristics for proper operation.

Flue Passage and Vent Inspection

Annual inspection of combustion air louvers, vent cap, heat exchanger, and burners.

Routine Service Recommendations

Annual servicing by a qualified technician is required for efficiency and warranty.

Filter Servicing

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

Burner Cleaning and Maintenance

Steps for cleaning burners, checking spark gap, and ensuring proper flame.

Blower Bearing Lubrication

Instructions for relubricating blower shaft bearings every two years.

Manifold Pressure Specifications

Table of manifold pressures for natural gas and propane by unit series.

Combustion Air Inducer Cleaning

Procedure for cleaning the combustion air inducer wheel and housing.

Flue Passageway Cleaning

Steps for cleaning the flue box and heat exchanger tubes.

Service Reminder Checklist

Checklist of items to verify before calling a service technician.

Repair Parts Listing

List of available repair parts categorized by system component.