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506099−01

*P506099-01*

04/09

*2P0409*

SGA036, 060,

120, 

240, AND

SGB288

©

2008 Lennox Industries Inc.

Litho U.S.A.

506099−01
4/2009
Supersedes 4/2008

WHAT TO DO IF YOU SMELL GAS:

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.

Dallas, Texas

D

Extinguish any open flames.

ROOFTOP

UNITS

READ ALL INSTRUCTIONS IN THIS MANUAL

AND RETAIN FOR FUTURE REFERENCE

SGA240 (20−TON) &
SGB288 (24−TON)

WARNING

Improper installation, adjustment, alteration, ser-
vice or maintenance can cause property damage,
personal injury or loss of life. Installation and ser-
vice must be performed by a qualified installer, ser-
vice agency or the gas supplier

D

Leave the building immediately.

FIRE OR EXPLOSION HAZARD

Failure to follow safety warnings ex-
actly could result in serious injury
death or property damage.

WARNING

SGA120 (10−TON)

LEN

O

X

N

LEN

O

X

N

LEN

O

X

N

LEN

O

X

N

LEN

O

X

N

Summary of Contents for SGA036

Page 1: ...or s phone Follow the gas suppli er s instructions D If you cannot reach your gas supplier call the fire department Dallas Texas D Extinguish any open flames ROOFTOP UNITS READ ALL INSTRUCTIONS IN THI...

Page 2: ...20 X 2 ECONOMIZER DAMPERS OPTIONAL BURNERS FILTER DRIER L L E N O X N L E N O X N IMC SG 120 Parts Arrangement L E N O X N L E N O X N L E N O X N L E N O X N COMBUSTION AIR INDUCER EVAPORATOR COIL BL...

Page 3: ...ustment alteration ser vice or maintenance can cause property damage personal injury or loss of life Installation and ser vice must be performed by a qualified installer ser vice agency or the gas sup...

Page 4: ...operty Vent ini tial supply air outside when possible Unit Operation FOR YOUR SAFETY READ BEFORE LIGHTING BEFORE LIGHTING smell all around the furnace area for gas Be sure to smell next to the floor b...

Page 5: ...gas supplier Turning Off Gas to Furnace 1 If using an electromechanical thermostat set to the lowest setting 2 Before performing any service turn off all electrical power to the furnace 3 Open or remo...

Page 6: ...er lubrication is required Blower shaft bearings are prelubricated For extended bearing life relubricate at least once every two years with a lithium base grease such as Alvania 3 Shell Oil Chevron BR...

Page 7: ...s obstructed Under normal operating conditions the combustion air blower wheel should be checked and cleaned prior to the heating season However it should be examined periodically during the heating s...

Page 8: ...is required 1 Be sure electrical disconnect switches are ON 2 Check room thermostat for proper setting 3 Replace any blown fuses or reset circuit breakers 4 Gas valve should be ON 5 Air filters shoul...

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