Lennox ML180UHE Simple Manual

ML180UHE / Page 3
HEATING SYSTEM
Lennox Duralok™ Heat Exchanger Assembly
Heavy gauge aluminized steel heat exchanger.
Crimped seam clamshell type design.
Designed for normal expansion and contraction.
Minimum resistance to
air ow.
Heat exchanger has
been laboratory life
cycle tested in excess of
industry standards.
Compact size of heat
exchanger permits low
overall design of furnace
cabinet.
Inshot Burners
Aluminized steel inshot burners provide efcient,
trouble-free operation.
Burner venturi mixes air and gas in correct proportion
for proper combustion.
Burner assembly is removable from the unit as a single
component for ease of service.
SureLight
®
Hot Surface Ignitor
Tough, reliable, long-life, trouble-free performance.
Silicon nitride ignitor.
Cemented to steatite block for protection against current
leakage.
Ignition leads are constructed of nickel plated copper
and are enclosed in high temperature Teon
®
insulation
for dependable operation.
Gas Control Valve
24 volt redundant combination gas control valve
combines manual shut off switch (On-Off), automatic
electric valve (dual) and gas pressure regulation into a
compact combination control.
Combustion Air Inducer
Shaded pole heavy duty blower prepurges heat
exchanger and safely vents ue products.
Pressure switch proves blower operation before
allowing gas valve to open.
Operates only during heating cycle.
Direct access allows inducer assembly to be rotated
90° clockwise or counterclockwise to facilitate easy vent
attachment from either side of the cabinet in upow
applications and from the top in horizontal applications.
A
B
C
D
E
F
Flame Rollout Switches (2)
Manual reset switches are factory installed on burner
box.
Switches provides protection from abnormal operating
conditions.
Limit Controls
Automatic reset, primary and secondary limits are
accurately located.
Primary limit factory installed on vestibule panel on
all units, secondary limit factory installed on blower
housing.
OPTIONS
High Altitude Pressure Switch Kit
Required on most units for proper unit operation at
altitudes from 4,501 to 7500 ft.
Natural Gas to LPG/Propane Conversion Kit
Required for eld changeover from natural gas to LPG/
Propane.
LPG/Propane to Natural Gas Conversion Kit
Required for eld changeover from LPG/Propane to
natural gas.
Vent Adaptor (Upow Applications Only)
Allows venting through a
masonry chimney without the
need of a ue liner.
Manual reset temperature
sensor protects against
abnormal operating conditions.
Sensor wiring may be routed
from either side of adaptor.
Minimum winter design
temperatures:
−10°F when used with interior masonry chimneys.
+5°F when used with exterior masonry chimneys.
Refer to Winter Design Temperatures Map on page 6
for application information. Also refer to the installation
instructions for detailed information.
BLOWER
Direct drive blower.
Statically and dynamically balanced.
Resiliently mounted.
Blower assembly easily removed for servicing.
High Efciency Constant Torque Blower Motor
ECM (Electronically Commutated Motor) motor.
Motor is programmed to provide constant torque at each
of the selectable speeds.
Motor is controlled by the Integrated Furnace Control.
Blower speeds are easily changed on the integrated
furnace control. See blower performance tables.
G
7 in.
(178 mm)
6 in.
(152 mm)
H
FEATURES

Lennox ML180UHE Specifications

General

Brand	Lennox
Model	ML180UHE
Category	Furnace
Language	English