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UNIT INFORMATION
UNIT INFORMATION
S e r v i c e L i t e r a t u r e
©2016 Lennox Industries, Inc.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional HVAC
instale (or equivalent), service agency or the gas
supplier.
CAUTION
As with any mechanical equipment, contact with
sharp sheet metal edges can result in personal
injury. Take care while handling this equipment and
wear gloves and protective clothing.
ML193UHE series units are high-efficiency gas furnac
-
es manufactured with Lennox DuralokPlus
™
aluminized
steel clamshell-type heat exchangers, with a stainless
steel condensing coil. ML193UHE units are available in
heating input capacities of 30,000 to 110,000 Btuh (8.8 to
32.2 kW) and cooling applications from 2 through 5 tons
(7.0 through 17.6 kW). Refer to Engineering Handbook for
proper sizing.
Units are factory equipped for use with natural gas. A kit
is available for conversion to LPG operation. All ML193U
-
HE units are equipped with a hot surface ignition system.
The gas valve is redundant to assure safety shut-off as
required by C.S.A.
The heat exchanger, burners and manifold assembly can
be removed for inspection and service. The maintenance
section gives a detailed description on how this is done.
The ML193UHE can be “twinned” with a second unit. See
twinning kit 16W72 for information for two units to operate
as one, in a shared duct system controlled by a single
thermostat. All specifications are subject to change. Pro
-
cedures outlined in this manual are presented as a rec
-
ommendation only and do not supersede or replace local
or state codes.
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
Table of Contents
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Blower Performance Data . . . . . . . . . . . . . . . . . . . . . . 5
I-Unit Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
II Placement and Installation . . . . . . . . . . . . . . . . . . . . 21
III-Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
IV-Heating System Service Checks . . . . . . . . . . . . . . 41
V-Typical Operating Conditions . . . . . . . . . . . . . . . . . 45
VI-Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
VII-Sequence of Operation and Flow Charts . . . . . . 49
ML193UHE
Corp 1905-L1
08/2022
ML193UHE SERIES UNITS
