E 2011 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
UPFLOW
AIR FLOW | AIR FLOW |
HORIZONTAL LEFT | HORIZONTAL RIGHT |
INSTALLATION
INSTRUCTIONS
ML180UHE
MERIT® SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
506810−01
06/2011
Supersedes 506732−01
Litho U.S.A.
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.
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 installer (or equivalent), service agency or the gas supplier.
CAUTION
As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.
Table of Contents
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Parts Arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ML180UHE Gas Furnace . . . . . . . . . . . . . . . . . . . . . . . . . 4
Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 4
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Use of Furnace as a Construction Heater . . . . . . . . . . . 5 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Combustion, Dilution & Ventilation Air . . . . . . . . . . . . . . 6
Setting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Integrated Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Unit Start−Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . 30
High Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Proper Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Other Unit Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . . . . 33
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Planned Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Integrated Control Diagnostic Codes . . . . . . . . . . . . . . . 38
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
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