Lennox LGH420 User's Information Manual
35, 40, 45 and 50 tons
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Also See for LGH420:
- Installation instructions manual (62 pages) ,
- Installation instructions manual (8 pages)
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See unit nameplate for manufacturer
and address.
506345-02
9/2015
Supersedes 506345-01
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.
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 supplier's
instructions.
D If you cannot reach your gas supplier, call
the fire department.
LGH420, 480, 540, 600
(35, 40, 45 and 50 TONS)
ROOFTOP
UNITS
©2015
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Summary of Contents for Lennox LGH420
- Page 1 See unit nameplate for manufacturer and address. 506345-02 9/2015 Supersedes 506345-01 LGH420, 480, 540, 600 (35, 40, 45 and 50 TONS) ROOFTOP UNITS READ ALL INSTRUCTIONS IN THIS MANUAL AND RETAIN FOR FUTURE REFERENCE ©2015 WARNING FIRE OR EXPLOSION HAZARD Failure to follow safety warnings ex...
- Page 2 Page 1...
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Page 3: For Your Safety Read Before Lighting
Safety WARNING 1- Keep unit area clear and free of combustible materials, gasoline and other flammable vapors and Danger of electrical shock, explosion and fire. Improper servicing could liquids. result in dangerous operation, serious 2- Do not obstruct air flow to unit. Unit must receive inujry, death or property damage. - Page 4 Placing Unit Into Operation 1- Set thermostat to lowest setting. 2- Turn off all electrical power to appliance. WARNING 3- This appliance is equipped with an ignition device which automatically lights the burner. Do not try to Danger of explosion and fire. Can cause light the burner by hand.
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Page 5: Heat Exchanger Assembly
Burner Flame Service To maintain efficiency and longevity, your equipment must be serviced yearly by a qualified service technician. WARNING Failure to provide proof of service can void warranty. Danger of explosion and fire. Can cause CAUTION injury or product or property damage. Periodically inspect burner flame to en... - Page 6 REMOVE FILTERS WARNING Danger of explosion. Can cause injury or death. Do not overtighten main burner mounting screws. Snug tighten only. BURNER BOX ASSEMBLY BURNER SUPPORT FLAME SENSOR FIGURE 4 BURNERS Lubrication All motors are lubricated at the factory. No further lubrication is required.
- Page 7 Combustion Air Inducer is recommended that the combustion air inducer gasket be replaced during reassembly. A combustion air inducer proving switch checks 6- Use a small brush to clean the combustion air inlet combustion air inducer operation before allowing power louvers on the heat access panel.
- Page 8 MODULATING GAS VALVE (MGV) TO RIGHT HEAT SECTION RIGHT HEAT SECTION MODULATING TO LEFT HEAT GAS VALVE SECTION MANIFOLD PRESSURE PORT LEFT HEAT SECTION MODULATING RIGHT HEAT GAS VALVE SECTION GAS VALVE LEFT HEAT SECTION GAS VALVE MANIFOLD PRESSURE INLET PORT FIGURE 7 Optional Modulating Gas Valve (MGV)