© 2024 Lennox Industries Inc.
Dallas, Texas USA
WARNING
This furnace is equipped with an ignition control
factory enabled for use with Lennox A2Lrefrigerant
sysytems.
Disabling
functionality on A2L system is prohibited by safety
codes. Refer to furnace installation instructions for
non-A2L and non-Lennox refrigerant system setup.
Contents
Safety .............................................................................3
General ...........................................................................4
Filters ............................................................................10
Duct System ................................................................. 11
Venting ......................................................................... 11
Gas Piping ....................................................................17
Electrical .......................................................................19
the
refrigerant
detection
INSTALLATION
INSTRUCTIONS
ML180DFE(K)
MERIT
SERIES GAS FURNACE
®
UPFLOW / HORIZONTAL AIR DISCHARGE
508543-01
11/2024
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.
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.
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.
Twinning .......................................................................27
Unit Start-Up .................................................................31
High Altitude .................................................................32
Service..........................................................................35
Blower Data ..................................................................38
Page 1
WARNING
CAUTION
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