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See unit nameplate for manufacturer
and address.
504,875M
10/2008
Supersedes 1/2006
FBR113270
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.
10/08
*2P1008*
LGA/LGC036, 042, 048, 060, 072
LGA/LGC090, 102, 120, 150,
LGA/LGC156, 180, 210, 240, 300S
LGA/LGC248, 300H, 360
LGA240 SHOWN
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.
D Do not try to light any appliance.
D Extinguish any open flames.
D Do not touch any electrical switch; do not
D Leave the building immediately.
D Immediately call your gas supplier from a
D If you cannot reach your gas supplier, call
(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)
WHAT TO DO IF YOU SMELL GAS:
use any phone in your building.
neighbor's phone. Follow the gas suppli-
er's instructions.
the fire department.
(20, 25, and 30 TONS)
ROOFTOP
UNITS
Litho U.S.A.
504,875M
*P504875M*
©2006
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Summary of Contents for Lennox LGA042
- Page 1 See unit nameplate for manufacturer and address. 504,875M 10/2008 Supersedes 1/2006 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, 300H, 360 (20, 25, and 30 TONS) ROOFTOP...
- Page 2 LGA/LGC036, 042, 048, 060, 072 Parts Arrangement CONDENSER FAN HEAT EXCHANGER EVAPORATOR COIL FILTERS ECONOMIZER (OPTIONAL) COMPRESSOR COMBUSTION AIR INDUCER CONDENSATE DRAIN GAS VALVE DISCONNECT BURNERS (OPTIONAL) BLOWER 120V GFCI OUTLET (OPTIONAL) LGA/LGC090, 102, 120 and 150 Parts Arrangement EVAPORATOR CONDENSER FANS FILTERS COIL...
- Page 3 LGA/LGC156, 180, 210, 240 and 300S Parts Arrangement EVAPORATOR CONDENSER FANS COIL FILTERS ECONOMIZER DAMPERS (OPTIONAL) BLOWERS BLOWER MOTOR CONTROL BOX CONDENSATE DRAIN CONDENSER COILS 120V GFCI OUTLET (Factory−installed option) COMPRESSORS (3 COMPRESSORS ON LGA/LGC156 & 180 UNITS) DISCONNECT BURNERS (Factory−installed option) COMBUSTION AIR...
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Page 4: Unit Operation
Safety CAUTION Label all wires prior to disconnection when servic- 1− Keep unit area clear and free of combustible ing controls. Wiring errors can cause improper and materials, gasoline and other flammable vapors and dangerous operation. Verify proper operation after liquids. - Page 5 TYPICAL ELECTROMECHANICAL THERMOSTAT HONEYWELL VR8205M SERIES GAS VALVE INLET MANIFOLD PRESSURE PRESSURE Gas valve knob is shown in OFF position. FIGURE 3 HONEYWELL VR8205Q/VR8305Q SERIES GAS VALVE FIGURE 1 HIGH FIRE LOW FIRE ADJUSTMENT ADJUSTMENT MANIFOLD Placing Unit Into Operation PRESSURE WARNING Danger of explosion and fire.
- Page 6 3− Open or remove the heat section access panel. HEAT EXCHANGER ASSEMBLY (036−072) HEAT 4− VR8205, & VR8305 − EXCHANGER TUBES Turn the knob on the gas valve clockwise COMBUSTION OFF". Do not force. INDUCER 36E − Turn the knob 180° either way to OFF". 5−...
- Page 7 Servicing Filter TABLE 2 MANIFOLD PRESSURES in.wg. (kPa) Units are equipped with the number of filters shown in Natural Gas Propane (LP) Gas table 1. Filters should be checked monthly and replaced LGA/LGC Unit 1st Stg.+ 2nd Stg.+ 1st Stg.+ 2nd Stg.+ when necessary with filters of like kind and size.
- Page 8 Combustion Air Inducer combustion air inducer gasket be replaced during reassembly. A combustion air inducer proving switch checks combustion air inducer operation before allowing power 6− Use a small brush to clean the combustion air inlet to the gas controller. The gas controller will not operate if louvers on the heat access panel.
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