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INSTALLATION
INSTRUCTIONS
EL180UHE
507329-01
05/2016
Supersedes 01/2016
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.
© 2016 Lennox Industries Inc.
Dallas, Texas USA
Table of Contents
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
EL180UHE Gas Furnace . . . . . . . . . . . . . . . . . . . . . . . . . 3
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Use of Furnace as a Construction Heater . . . . . . . . . . . 4
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Combustion, Dilution & Ventilation Air . . . . . . . . . . . . . . 5
Setting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Integrated Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 27
High Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Proper Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Other Unit Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Start Up Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
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