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©2008 Lennox Industries Inc.
Dallas, Texas
506099−01
4/2009
Supersedes 4/2008
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
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.
04/09
*2P0409*
L E
N
O X N
SGA240 (20−TON) &
SGB288 (24−TON)
READ ALL INSTRUCTIONS IN THIS MANUAL
AND RETAIN FOR FUTURE REFERENCE
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings ex-
actly could result in serious injury
death or property damage.
WHAT TO DO IF YOU SMELL GAS:
D Do not try to light any appliance.
D Extinguish any open flames.
D Do not touch any electrical switch; do not
use any phone in your building.
D Leave the building immediately.
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.
SGA036, 060,
120,
240, AND
SGB288
L E
L E
L E
L E
N
N
O X N
O X N
N
N
O X N
O X N
*P506099-01*
ROOFTOP
UNITS
SGA120 (10−TON)
Litho U.S.A.
506099−01
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Table of Contents
Related Manuals for Lennox SGA036
Summary of Contents for Lennox SGA036
- Page 1 SGA036, 060, ©2008 Lennox Industries Inc. Dallas, Texas 506099−01 120, 4/2009 240, AND Supersedes 4/2008 SGB288 ROOFTOP UNITS O X N SGA240 (20−TON) & SGB288 (24−TON) WARNING Improper installation, adjustment, alteration, ser- O X N O X N O X N...
- Page 2 SG 036 & 060 Parts Arrangement FILTERS EVAPORATOR COIL (FOUR − 16 X 20 X 2") ECONOMIZER DAMPERS CONDENSER FANS (OPTIONAL) (1 FAN ON 036) BLOWER MOTOR BLOWER FILTER DRIER CONDENSATE DRAIN CONDENSER COIL COMBUSTION COMPRESSOR AIR INDUCER O X N O X N BURNERS GAS VALVE...
- Page 3 SG 240 & 288 Parts Arrangement EVAPORATOR FILTERS COIL CONDENSER (TWELVE − 20 ECONOMIZER FANS (6) X 20 X 2") DAMPERS (OPTIONAL) BLOWER MOTOR BLOWERS (2) FILTER DRIERS CONDENSER CONDENSATE COILS DRAIN SUPPLY AIR VFD O X N COMPRESSORS (4) (OPTIONAL) BURNERS GAS VALVE...
- Page 4 Use only your hand to push in or turn the gas control knob. WARNING Never use tools. If the knob will not push in or turn by hand, do not try to repair it, call a qualified service Electric shock hazard. Can cause technician.
- Page 5 1− Set thermostat to lowest setting. Burner Flame 2− Turn off all electrical power to furnace. 3− This furnace is equipped with an ignition device which WARNING automatically lights the burner. Do not try to light the burner by hand. Danger of explosion and fire.
- Page 6 NOTE−Filters must be U.L.C. certified or equivalent for TYPICAL HEAT EXCHANGER ASSEMBLY use in Canada. 120, 240, & 288 UNITS HEAT TABLE 1 EXCHANGER TUBE NUMBER AND SIZE OF FILTER BY UNIT SG Unit Qty Filter Size − inches (mm) COMBUSTION AIR INDUCER 036, 060...
- Page 7 HEAT SECTION − 036/060 UNITS WARNING (060 Shown) BURNER Electric shock hazard and danger of SUPPORT CAP explosion. Can cause injury, death or product or property damage. Turn off gas and electrical power to unit before performing maintenance servicing operations on the unit. Follow lighting instructions attached to unit when putting unit back into operation and after service or maintenance.
- Page 8 6− Make sure all access panels are in place. Repair Parts Listing The following repair parts are available through Lennox dealers. When ordering parts, include the complete model number and serial number listed on the ETL/CSA rating plate − e.g. SGA120H4BH1Y.