ã 1998 Lennox Industries Inc.
Litho U.S.A.
Page 1
Corp. 9822-L12
LGA/LCA
Service Literature
3.0 to 6.0 TON
10.5 to 21 kW
Revised 09/2001
LGA / LCA SERIES
The LGA / LCA 3, 3.5, 4, 5 and 6 ton(10.5,12.3, 14, 17.5and
21 kW) units are configure to order units (CTO) with a wide
selection of factory installed options. The
LGA/042/048/060/072 gas/electric packaged rooftop units
are availablein 78,000,92,000 or125,000 Btuh (22.85, 27, or
36.6 kW) heating inputs, with the LGA036 available only in
78,000 heating input. Gas heat sections are designed with
Lennox’ aluminized or optional stainless steel tube heat ex-
changers. The LCA cooling packaged rooftop units are
equipped with the same cooling sections as the LGA units.
Optional electric heat is factory-or field-installed in LCA units.
Electric heat operates in single or multiple stages depending
on the kW input size. 7.0 kW through 30kW heat sections are
available. LGA and LCA units have identical refrigerant cir-
cuits with 3, 3.5, 4, 5 and 6 ton (10.5, 12.3, 14, 17.5 and 21
kW) cooling capacities. LGA/LCA units utilize one compres-
sor.
The LGA and LCA units are designed to accept any of sev-
eral different energy management thermostat control sys-
tems with minimum field wiring. Factory or field provided
control options connect to the unit with jack plugs. When
”plugged in” the controls become an integral part of the unit
wiring.
Information contained in this manual is intended for use by
qualified service technicians only. All specifications are sub-
ject to change. Procedures outlined in this manual are pre-
sented as a recommendation only and do not supersede 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 instruc-
tions for the proper rigging technique.
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.
WARNING
!
LGA060 (5 TON) SHOWN
LCA060 (5 TON) SHOWN
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