Lennox LGA090 User's Information Manual
Lennox LGA090 User's Information Manual

Lennox LGA090 User's Information Manual

3, 3-1/2, 4, 5, 6, 7-1/2, 8-1/2, 10, 12-1/2, 13, 15, 17-1/2, 20, 25 and 30 tons rooftop units

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See unit nameplate for manufacturer
and address.
504,875M
1/2006
Supersedes
1/2004
LGA/LGC036,
042, 048, 060, 072
(3, 3-1/2, 4, 5, and 6 TONS)
LGA/LGC090,
102, 120, 150,
(7-1/2, 8-1/2, 10, and 12-1/2 TONS)
LGA/LGC156,
180, 210, 240, 300S
(13, 15, 17-1/2, 20, and 25 TONS)
LGA/LGC248,
30OH, 360
(20, 25, and 30 TONS)
ROOFTOP
UNITS
FBR113270
LGA240 SHOWN
READ ALL INSTRUCTIONS
IN THIS MANUAL
AND RETAIN FOR FUTURE
REFERENCE
_pu
Technical
blications
Litho U.S.A.
@2006
A\tL't F-,R _*_A
C
US
/-18TEO
j
A 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.
01/06
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Extinguish
any open flames.
• Do not touch any electrical
switch;
do not
use any phone in your building.
• Leave the building
immediately.
• Immediately
call your gas supplier
from
a
neighbor's
phone.
Follow
the gas suppli-
er's instructions.
• If you cannot
reach your gas supplier,
call
the fire department.
504,875M
IIIHII III 11111
IIIII IIIII 1111111111
II I III

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Summary of Contents for Lennox LGA090

  • Page 1 See unit nameplate for manufacturer and address. 504,875M 1/2006 Supersedes 1/2004 LGA/LGC036, 042, 048, 060, 072 (3, 3-1/2, 4, 5, and 6 TONS) LGA/LGC090, 102, 120, 150, (7-1/2, 8-1/2, 10, and 12-1/2 TONS) LGA/LGC156, 180, 210, 240, 300S (13, 15, 17-1/2, 20, and 25 TONS) LGA/LGC248, 30OH, 360 (20, 25, and 30 TONS)
  • Page 2 CONDENSER HEAT EXCHANGER EVAPORATOR COIL FILTERS ECONOMIZER (OPTIONAL) COMPRESSOR COMBUSTION AIRINDUCER DRAIN GAS VALVE DISCONNECT BURNERS (OPTIONAL) BLOWER 120V (OPTIONAL) ECONOMIZER DAMPERS (OPTIONAL) CONDENSER COIL DISCONNECT (Factory-installed option) (Factory-installed option) DRAIN COMBUSTION INDUCER BURNERS COMPRESSORS HEAT EXCHANGER GAS VALVE TUBES Page 1...
  • Page 3 BLOWERS BLOWER MOTOR, CONTROL CONDENSATE DRAIN CONDENSER COILS 120V GFCI OUTLET (Factory-installed option) COMPRESSORS (3COMPRESSORS LG_LGC156&180UNITS) DISCONNECT BURNERS (Factory=installed option) COMBUSTION INDUCER HEAT EXCHANGER TUBES CONDENSER FANS EVAPORATOR ECONOMIZER DAMPERS FILTERS COIL (OPTIONAL) BLOWER MOTOR CONDENSATE DRAIN CONDENSER COILS HEAT EXCHANGER TUBES COMPRESSORS (-248 AND -300H HAVE...
  • Page 4 ,&CAUTION 1- Keep unit area clear and free of combustible materials, gasoline andotherflammable v apors and liquids, 2 - Donotobstructairflowto unit, Unitmustreceive ,&WARNING an unobstructed flow of combustion and ventilating air, `&WARNING ,&WARNING `&WARNING ,&WARNING `&WARNING FOR YOUR SAFETY READ BEFORE LIGHTING AWARNING BEFORE LIGHTING smell all around the furnace area for gas.
  • Page 5 TYPICAL ELECTROMECHANICAL THERMOSTAT HONEYWELL VR8205M SERIES GAS VALVE INLET :::::::::::_T"_ MANIFOLD -//I 80 g0 25 80 \\\\'\/\/" IIII " 11 II "//// P RESTAS FIGURE 3 WHITE RODGERS 36C76 GAS VALVE HEAT OFF COOL FIGURE 1 STAGE 2 MANUAL MANIFOLD MANIFOLD INLET PRESSURE...
  • Page 6 11- Thecombustion a ir inducer w ill start,The burners will lightwithin40seconds, To maintain efficiency and longevity, your equipment 12- Ifthefurnace doesnotlightthefirsttime(gaslinenot must be serviced yearly by a qualified service technician. fullypurged), it willattempt u ptotwomoreignitions Failure to provide proof of service can void warranty. before lockingout, 13- If lockout o ccurs, r epeat s teps1through 10, A, CAUTION...
  • Page 7 ServicingFilter TABLE MANIFOLD PRESSURES in.wg. (kPa) Unitsareequipped withthe number o f filtersshown in Natural Propane (LP) Gas table1,Filters should bechecked monthly a ndreplaced LGA/LGC Unit 1st Stg.+ 2nd Stg.+ 1st Stg.+ 2nd Stg.+ whennecessary withfilters oflikekindandsize. T ake note 0.2(+.05) 0.3 (+.08) 0.2 (+.05) 0.3 (+.08)
  • Page 8 4-Replace burners and screws securingburner, Return the combustion air inducer motor and the vent Replace theburner c ompartment access panel, connector to their original location and secure with retained screws. It is recommended that 5- Turn on the electrical power and the gas supply to the combustion air inducer gasket be replaced during unit, Follow the operating instructions attached to the reassembly.

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