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2015 Lennox Industries Inc.
Dallas, Texas, USA
AIR FLOW
UPFLOW
AIR FLOW
AIR FLOW
HORIZONTAL RIGHT
HORIZONTAL LEFT
Los calefactores están
aprobados por el Instituto
del Gas Argentino (IGA)
para funcionar con gas
natural y no se pueden
convertir para funcionar
con gas licuado.
INSTALLATION
INSTRUCTIONS
ML180UHT
MERIT
®
SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
507408-01
06/2015 Supersedes 507061-01
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
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ML180UHT Gas Furnace
3
. . . . . . . . . . . . . . . . . . . . . . . . .
Shipping and Packing List
3
. . . . . . . . . . . . . . . . . . . . . . . .
Requirements
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combustion, Dilution & Ventilation Air
4
. . . . . . . . . . . . . .
Setting Equipment
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filters
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duct System
11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Venting
12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Piping
19
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical
21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Integrated Control
22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Start-Up
24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gas Pressure Adjustment
25
. . . . . . . . . . . . . . . . . . . . . . . .
Proper Combustion
25
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude
26
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other Unit Adjustments
26
. . . . . . . . . . . . . . . . . . . . . . . . . .
Service
27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Parts
28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Litho U.S.A.
