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508117-01 2/2021
Shipping and Packing List
Package 1 of 1 contains:
1- Assembled unit
Check unit for shipping damage. Receiving party should
contact last carrier immediately if shipping damage is found.
General
These instructions are intended as a general guide and
do not supersede local codes in any way. Authorities
having jurisdiction should be consulted before
installation.
The LGM156U gas/electric packaged rooftop unit is
available in 260,000 & 360,000 Btuh heating input. The
LGM180U, 210U, 240U, & 300U gas/electric
packaged rooftop units are available in 260,000,
360,000, or 480,000 Btuh heating inputs.
The LCM cooling packaged rooftop unit is the same basic
design as the LGM unit except for the heating section.
Optional electric heat is factory- or field-installed in LCM
units.
LGM and LCM units have identical refrigerant circuits with
respective 13, 15, 17‐1/2, 20 and 25 ton cooling
capacities. 156U and 180U units contain three
compressors; one is variable speed and the other two are
fixed speed compressors. 210U, 240U and 300U units
contain four compressors; one is variable speed and the
other three are fixed speed compressors.
Units come standard with a factory-installed fin/tube
condenser coil.
Units are available with an optional hot gas reheat coil
which provides a dehumidifying mode of operation. Refer
to Reheat Operation section.
Units are available with variable air volume or single-zone
variable air volume. Refer to the 9
th
character of the
model number to determine type of blower:
V - Variable Air Volume
M - Single-Zone Variable Air Volume
Units use R410A, an ozone-friendly HFC refrigerant.
Refer to the Cooling Start-Up section for precautions
when installing unit.
WARNING
Electric shock hazard and danger of
explosion. Can cause injury, death or
product or property damage. Turn off
gas and electrical power to unit before
performing any maintenance or
servicing operations on the unit. Follow
lighting instructions attached to unit
when putting unit back into operation
and after service or maintenance.
Requirements
See figure 1 for unit clearances.
UNIT CLEARANCES - 156, 180U UNIT SHOWN
C
D
B
A
FIGURE 1
Optional
Outdoor
Air Hood
1Unit
Clearance
A
in.(mm)
B
in.(mm)
C
in.(mm)
D
in.(mm)
Top
Clearance
Service
Clearance
60
(1524)
36
(914)
36
(914)
66
(1676)
Unob
structed
Clearance to
Combus
tibles
36
(914)
1 (25)
1 (25)
1 (25)
Unob
structed
Minimum
Operation
Clearance
36
(914)
36
(914)
36
(914)
41
(1041)
Unob
structed
Note - Entire perimeter of unit base requires support when elevated above
mounting surface.
1
Service Clearance
- Required for removal of serviceable parts.
Clearance to Combustibles
- Required clearance to combustible material
(gas units).
Minimum Operation Clearance
- Required clearance for proper unit
operation.
