Lennox LCM Series Unit Information

S e r v i c e L i t e r a t u r e
LCM036U, 048U, 060U, and 074U are ultra high efficiency
packaged units equipped with variable speed direct drive
blowers, an inverter-driven variable speed compressor,
and a variable speed outdoor fan.
Optional electric heat is factory or field installed . Electric
heat operates in single stage depending on the kW input
size. 7.5kW through 22.5 kW heat sections are available
for the LCM unit.
Information contained in this manual is intended for use
by qualified service technicians only. All specifications are
subject to change. Procedures outlined in this manual are
presented as a recommendation only and do not super-
sede or replace local or state codes.
If the unit must be lifted for service, rig unit by attaching
four cables to the holes located in the unit base rail (two
holes at each corner). Refer to the installation instructions
for the proper rigging technique.
WARNING
Improper installation,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and service
must be performed by a licensed professional
HVAC installer or equivalent, service agency, or the
gas supplier.
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.
IMPORTANT
The Clean Air Act of 1990 bans the intentional
venting of refrigerant (CFC's and HCFC's) as of July
1, 1992. Approved methods of recovery, recycling
or reclaiming must be followed. Fines and/or
incarceration may be levied for non-compliance.
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.
UNIT INFORMATION UNIT INFORMATION
Ultra High Efficiency LCM036U through 074U
adjustment, alteration,
100039
02/2022
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
Electrostatic
electronic components. Take precautions
to neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.

Table of Contents

Options / Accessories . . . . . . . . . . Page 2
Specifications . . . . . . . . . . . . . . . . . Page 5
Blower Data . . . . . . . . . . . . . . . . . . Page 6
Electrical /Electric Heat Data . . . . . Page 11
Electric Heat Capacities . . . . . . . . Page 15
Parts Arrangement . . . . . . . . . . . . Page 16
I Unit Components . . . . . . . . . . . . . Page 17
II Placement and Installation . . . . . Page 30
III Start Up Operation . . . . . . . . . . . Page 30
IV Charging . . . . . . . . . . . . . . . . . . . Page 31
V System Service Checks . . . . . . . Page 32
VI Maintenance . . . . . . . . . . . . . . . Page 32
VII Accessories . . . . . . . . . . . . . . . .Page 33
VIII Diagrams . . . . . . . . . . . . . . . . . Page 41
Page 1
LCM SERIES
3 to 6 Ton
CAUTION
discharge can affect