© 2024 Lennox Industries Inc.
Dallas, Texas USA
Contents
Safety .............................................................................3
General ...........................................................................4
Filters ............................................................................10
Duct System ................................................................. 11
Venting ......................................................................... 11
Gas Piping ....................................................................17
DOWNFLOW
AIR FLOW
Electrical .......................................................................19
Unit Start-Up .................................................................24
High Altitude .................................................................25
Service..........................................................................28
Blower Data ..................................................................33
Page 1
INSTALLATION
INSTRUCTIONS
ML180DFE
MERIT
SERIES GAS FURNACE
®
DOWNFLOW DISCHARGE AIR
506734-03
04/2024
Supersedes 01/2023
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
This is a safety alert symbol and should never be
ignored. When you see this symbol on labels or in man-
uals, be alert to the potential for personal injury or death.
WARNING
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 HVAC installer or
equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
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