Lennox ML180UHE Simple Manual

ML180UHE / Page 4
CONTROLS
SureLight
®
Integrated Furnace Control
Control contains all necessary controls and relays to
operate furnace.
Combustion air inducer is operated by the integrated
furnace control. Prior to ignition, a pre-purge cycle
for 15 seconds is initiated. After the main burners are
turned off, a post-purge cycle for 5 seconds is run.
Flame sensor assures safe and reliable operation.
Should loss of ame occur the integrated furnace
control will initiate 4 re-attempts at ignition before
locking out unit operation for 60 minutes.
Watchguard type circuit automatically resets ignition
controls after one hour of continuous thermostat demand
after unit lockout, eliminating nuisance calls for service.
Fan control consists of adjustable blower timed-off delay
(60, 90, 120, 180 seconds - factory setting 90 seconds)
and xed blower timed-on delay (30 seconds - heating,
2 seconds - cooling).
For air-conditioning applications, blower is automatically
energized on thermostat demand for cooling. Control
has low speed continuous blower speed setting for
humidier or air cleaner operation.
Two accessory terminals furnished for additional
power supply requirements for 120 volt (less than 1
amp) power humidiers and powered air cleaners.
One additional terminal is furnished for power supply
requirements for 24V (less than 0.5 amp) low voltage
accessories.
Ignition control has single red LED to indicate status
and as an aid in troubleshooting.
Last ve codes are stored in non-volatile memory
(accessible by recall button on control) for servicing.
24 Volt Transformer
Furnished and factory installed on outside of control
box. 40VA transformer has fuse wired in series.
Field Wiring Make-up Box
Furnished for line voltage wiring.
Factory installed internally on left side of furnace.
Box may be installed on right side of furnace.
I
FEATURES
OPTIONS
Thermostat
Thermostat (programmable/non-programmable) is not
furnished with unit.
See Thermostat bulletins in Controls Section and
Lennox Price Book for selection.
FILTER (NOT FURNISHED)
Filter and provisions for external mounting must be eld
provided.
OPTIONS
Air Filter and Rack Kit for Horizontal Return Air
(End) Applications
Washable or vacuum cleanable polyurethane frame
type lter and external end return air rack available for
eld installation.
Rack has lter door for easy lter servicing.
Flanges on rack allow easy duct connection.
See dimension drawing.
Air Filter and Rack Kit for Upow Side Return Air
Applications - Not for use with Return Air Base
Washable or vacuum cleanable polyurethane frame
type lter and external side return air rack available for
eld installation.
Available in single and ten pack kits.
Rack has lter door for easy lter servicing.
Flanges on rack allow easy duct connection.
Field installs on either side of unit cabinet. See
dimension drawing.

Lennox ML180UHE Specifications

General

Brand	Lennox
Model	ML180UHE
Category	Furnace
Language	English