Lennox LGC120

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 LGC120 Specifications

General

Cooling Capacity	120, 000 BTU
Energy Efficiency Ratio (EER)	Up to 11.0
Refrigerant	R-410A
Voltage	208/230V
Compressor Type	Scroll
Stages	Single Stage
HSPF	Not Available

Summary

Parts Arrangement

Safety

General Safety Precautions

General safety guidelines for unit operation, including area clearance and airflow.

Hazard Warnings

Crucial warnings regarding explosion, fire, electrical shock, and improper servicing risks.

Fiberglass Wool Exposure

Information on potential health risks from fiberglass wool exposure during maintenance.

Unit Operation

Lighting Procedure

Instructions for safely starting the furnace ignition sequence, including pre-lighting checks.

Placing Unit Into Operation

Gas Valve Operation

Detailed steps for operating the gas valve on different models for unit startup.

Turning Off Gas to Furnace

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

Unit Operation Details

Burner Flame Inspection

Guidance on inspecting burner flame for proper operation during the heating season.

Flue Passage and Vent Inspection

Annual inspection of flue passages and vents for corrosion or debris.

Service

Servicing Filter

Lubrication

Information on lubricating blower shaft bearings for extended life.

Manifold Pressures

Reference to manifold pressure values and pressure port locations.

Burners

Combustion Air Inducer

Flue Passageway and Flue Box

Procedure for cleaning the flue passageway and flue box components.

Service Reminder

Repair Parts Listing