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PRODUCT LITERATURE
1997 Lennox Industries Inc.
Dallas, Texas
INSTALLATION
INSTRUCTIONS
G20R SERIES UNITS
GAS UNITS
503,560M
2/97
Supersedes 11/96
TABLE OF CONTENTS
UNIT DIMENSIONS 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PARTS ARRANGEMENT 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
REQUIREMENTS 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMBUSTION, DILUTION AND VENTILATION AIR 5. . . .
INSTALLATION–Setting Equipment 7. . . . . . . . . . . . . . . . . . .
RETURN AIR OPENING GUIDELINES 8. . . . . . . . . . . . . . . .
DUCT SYSTEM 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VENTING 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GAS PIPING 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ELECTRICAL 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UNIT START–UP 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
HIGH ALTITUDE INFORMATION 15. . . . . . . . . . . . . . . . . . . .
GAS PRESSURE ADJUSTMENT 15. . . . . . . . . . . . . . . . . . . .
OTHER UNIT ADJUSTMENTS 15. . . . . . . . . . . . . . . . . . . . . .
SERVICE 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REPAIR PARTS 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
START–UP AND PERFORMANCE CHECK LIST 19. . . . . .
BCC TROUBLESHOOTING 20. . . . . . . . . . . . . . . . . . . . . . . .
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WHAT TO DO IF YOU SMELL GAS:
If the information in this manual is not
followed exactly, a fire or explosion
may result causing property damage,
personal injury or loss of life.
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
performed by a qualified installer,
service agency or the gas supplier.
Do not try to light any appliance.
Do not touch any electrical switch; do not
use any phone in your building.
Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
If you cannot reach your gas supplier, call
the fire department.
Extinguish any open flames.
Litho U.S.A.
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