Lennox ML193UH User Manual

ML193UH / Page 3
HEATING SYSTEM (CONTINUED)
Lennox Designed Header Box
Header box on end of condenser coil collects ue
condensate for disposal through condensate drains.
The drains are located on each side of the cabinet for
easy eld installation of condensate drain trap.
Only one drain is used, the other drain is sealed.
Condensate drain trap is included with the unit for eld
installation.
Lennox Designed Flue Condensate Trap Assembly
Condensate trap assembly is mounted outside the
conditioned air stream.
Assembly can be mounted on either side of cabinet
in upow applications. Assembly is mounted below
the cabinet in horizontal applications. See Dimension
Drawing and Installation Instructions. Can also be
mounted remotely (up to 5 ft. away) from unit.
Drain connection can be made with eld provided PVC
pipe or PVC coupling.
Drain cap on trap allows easy cleaning and winterizing.
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.
Hot Surface Nitride Ignitor
Unique, non-porous, high strength proprietary
ceramic material provides long life and trouble-free
maintenance.
Low mass element provides fast heat−up and consistent
igniter temperature with low power usage.
Cemented to alumina block for positive mounting and
protection against current leakage.
High temperature Teon
®
insulated ignition lead wires
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.
Operates only during heating cycle.
Pressure Switch
Proves Combustion Air Inducer operation before
allowing gas valve to open.
D
E
F
G
Flame Rollout Switches (2)
Manual reset switches are factory installed on burner box.
Switch provides protection from abnormal operating
conditions.
Limit Control
Automatic reset, primary limit is accurately located on
vestibule panel on all units.
OPTIONS
High Altitude Orice Kit − natural gas models only
Required on all natural gas units for proper unit
operation at altitudes from 7,501 to 10,000 ft.
High Altitude Pressure Switch Kit
Required for proper unit operation on installations above
4500 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.
DIRECT VENT / NON-DIRECT VENT
Furnace can be installed in either Direct Vent or Non-
Direct applications.
In Direct Vent applications, combustion air is supplied
from outdoors and ue gases are discharged outdoors.
In Non-Direct Vent applications, combustion air is
supplied from indoors and ue gases are discharged
outdoors.
OPTIONS
Termination Kits
Facilitates installation of combustion air intake pipe and
ue exhaust pipe.
Refer to venting table in this bulletin to determine pipe
size needed and proper termination kit required.
See Optional Accessories table and dimension
drawings.
Termination Kit - Concentric - Direct Vent
Applications
2 or 3 inch kit contains concentric termination
assembly, reducer bushing and 45° elbow.
2 inch kit for -045-070 models contains an outdoor
exhaust accelerator.
Kit requires single hole penetration of roof or wall for
installation.
Roof Termination Flashing Kit is available for use with
2 inch Kits.
CSA certied.
Termination Kit - Flush-Mount
Kit contains ush-mount termination, accelerator,
mounting template and hardware.
Kit may be used with 2, 2-1/2 or 3 in. pipe.
H
FEATURES

Lennox ML193UH Specifications

General

Brand	Lennox
Model	ML193UH
Category	Furnace
Language	English