1
INSTALLATION INSTRUCTIONS
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
LENNOX MERIT SERIES
™
GAS FURNACE
506998-01
08/2013 Supersedes 06/2012
Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, personal injury or loss of life.
Installation and service must be performed
by a licensed professional installer (or
equivalent), service agency or the gas
supplier.
WARNING
!
!
As with any mechanical equipment, personal
injury can result from contact with sharp
sheet metal edges. Be careful when you
handle this equipment.
CAUTION
!
TABLE OF CONTENTS
Lennox Merit Series
™
Furnace Specifications ........... 2
Lennox Merit Series
™
Gas Furnace ............................ 3
Shipping and Packing List........................................... 3
Requirements ............................................................... 3
General ......................................................................... 4
Shipping and Packing List........................................... 4
General ......................................................................... 4
Location/Placement ..................................................... 4
Duct System ................................................................. 5
Installing Optional Cooling Coil ................................... 5
Venting ......................................................................... 6
General Lennox Merit Series
™
E or EC Series ......... 17
Gas Piping .................................................................. 17
Electrical .................................................................... 18
Filters ......................................................................... 19
Duct System ............................................................... 19
Venting ....................................................................... 19
Gas Piping .................................................................. 19
Electrical .................................................................... 21
Integrated Control ...................................................... 22
Lennox Merit Series
™
Schematic wiring diagram ... 23
Unit Start-Up .............................................................. 24
Gas Pressure Adjustment .......................................... 25
Proper Combustion .................................................... 26
High Altitude .............................................................. 26
Other Unit Adjustments ............................................. 27
Service ....................................................................... 28
Repair Parts ............................................................... 31
This is a safety alert symbol and should never be ignored.
When you see this symbol on labels or in manuals, be alert to
the potential for personal injury or death.
