Lennox ML193UH User Manual

ML193UH / Page 4
DIRECT VENT (CONTINUED)
Termination Kits - Wall Assembly
Close Couple (US Only) - Direct Vent Applications
2 or 3 inch kit consists of close-couple, side-by-side
PVC piping with galvanized steel wall cover plate for
sealing and isolating piping penetration of the wall.
Piping spacing and length is sized for proper wall
installations.
CSA certied.
Close Couple WTK (Canada Only) - Direct Vent
Applications
2 or 3 inch kit contains one insulated faceplate, one
insulated exhaust pipe, elbow and ttings.
Wall Ring - Direct Vent or Non-Direct Vent
Applications
2 inch kit contains 2 stainless steel outside seal caps,
2 galvanized steel inside seal caps, 4 seal rings for
the caps and 18 inch insulation sleeve for sealing and
isolating intake and exhaust piping penetration of wall.
Maintain a maximum of 6 inches between the inlet and
outlet openings in the installation of the pipes.
Roof Termination Flashing Kit
2 or 3 inch kit contains two neoprene rubber roof
ashings for vertical venting through a roof.
Vent pipe and insulation not furnished.
Also available for use with 2 inch (use 3 inch ashing)
Concentric Vent Termination Kits used in vertical
venting rooftop applications.
CONTROLS
Integrated Furnace Control Board
Board contains all necessary controls and relays to
operate furnace.
Combustion air inducer is controlled by board. 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.
Ignition control board continuously monitors line voltage
and maintains the igniter power at a constant level to
provide consistent lighting and maximum igniter life.
Electronic ame sensor assures safe and reliable
operation.
Should loss of ame occur, ame sensor controls 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).
For air-conditioning applications, blower is automatically
energized on thermostat demand for cooling.
I
FEATURES
Two accessory terminals furnished for additional power
supply requirements for 120 volt (less than 1 amp)
power humidiers and powered air cleaners.
Ignition control has two LED’s to indicate status and as
an aid in troubleshooting.
24 Volt Transformer
Furnished and factory installed in 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 internally or externally on either
side of furnace.
OPTIONS
Furnace Twinning Kit
Required to operate two furnaces simultaneously.
Kit consists of twinning control and two fan sensors.
Thermostat
Thermostat (programmable/non-programmable) is not
furnished with unit.
See Thermostat bulletins in Controls Section and
Lennox Price Book for selection.
Night Service Kit
Contains most commonly used service parts:
• Control board
• Igniter
• Flame sensor
• Gas valve
• Transformer
• Service Manual
BLOWER
Multi-speed direct drive blower.
Statically and dynamically balanced.
Resiliently mounted.
Blower assembly easily removed for servicing.
Blower speeds are easily changed on the integrated
furnace control board. See blower performance tables.
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Lennox ML193UH Specifications

General

Brand	Lennox
Model	ML193UH
Category	Furnace
Language	English