Filter
Top Products
Page 1
08/13
*2P0813*
507121-01
*P507121-01*
E 2013 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
UPFLOW
AIR FLOW
AIR FLOW
HORIZONTAL RIGHT
HORIZONTAL LEFT
INSTALLATION
INSTRUCTIONS
ML193UH
MERIT
®
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
507121-01
08/2013
Supersedes 06/2013
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 manuals, be alert
to the potential for personal injury or death.
CAUTION
As with any mechanical equipment, personal injury
can result from contact with sharp sheet metal
edges. Be careful when you handle this equipment.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, person
al injury or loss of life. Installation and service must
be performed by a licensed professional HVAC in
staller (or equivalent), service agency or the gas sup
plier.
Table of Contents
Unit Dimensions 2................................
ML193UH Gas Furnace 3..........................
Shipping and Packing List 3........................
Safety Information 3...............................
Use of Furnace as a Construction Heater 4...........
General 5........................................
Combustion, Dilution, Ventilation Air 5...............
Setting Equipment 8...............................
Filters 13..........................................
Duct System 13....................................
Pipe and Fittings Specifications 13...................
Joint Cementing Procedure 15.......................
Venting Practices 16...............................
Vent Piping Guidelines 17...........................
Gas Piping 34.....................................
Electrical 37.......................................
Integrated Control 39...............................
Unit Start Up 40....................................
Gas Pressure Measurement 41......................
Proper Combustion 42..............................
High Altitude 42....................................
Testing For Combustion Air Non-Direct Vents 44.......
Other Unit Adjustments 45..........................
Twinning the ML193UH 45..........................
Service 46........................................
Repair Parts List 47................................
Start Up Checklist 48...............................
Litho U.S.A.