PARTS ARRANGEMENT
(LGM210, 240, 300 SHOWN)
EVAPORATOR
COIL
COMBUSTION
AIR INDUCER
CONDENSER FANS
(4 ON 156 & 180)
CONDENSER
COILS
COMPRESSORS
(3 ON 156 & 180)
GAS VALVE
BURNERS
FILTERS
(SIX - 24 X 24 X 2”)
DISCONNECT
(FACTORY-INSTALLED
OPTION)
REHEAT
COIL
BLOWERS
BLOWER
MOTOR
ECONOMIZER
DAMPERS
(OPTIONAL)
CONDENSATE
DRAIN
VARIABLE SPEED
COMPRESSOR INVERTER
BLOWER
INVERTER
UNIT
CONTROLLER
FIGURE 1
I-UNIT COMPONENTS
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.
wear gloves and protective clothing. All 13 through 25 ton
come standard with hinged unit panels. The unit panels
may be held open with the door rod located inside the
is yellow and L3 is blue.
A-Control Box Components
Precautions and Procedures
CAUTION
electronic components. Take precautions
to neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.
-
trol box is located in the upper portion of the compressor
compartment.
1-Disconnect Switch S48
Units with higher SCCR rating may be equipped with an
-
tional circuit breakers may be used, such as CB10. S48
and CB10 are toggle or twist-style switches, which can
be used by the service technician to disconnect power to
the unit.
2-Control Transformer T1
All use a single line voltage to 24VAC transformer mount-
ed in the control box. Transformer supplies power to con-
trol circuits in the unit. The transformer is rated at 70VA
and is protected by a 3.5 amp circuit breaker (CB8). The
208/230 (Y) voltage transformers use two primary voltage
-
age transformers use a single primary voltage tap.
BLUE YELLOW
ORANGE
RED
BLACK
230 VOLTS
208 VOLTS
PRIMARY
SECONDARY
FIGURE 2
3-Contactor Transformer T18
T18 is a single line voltage to 24VAC transformer used in
all LGM 13 to 25 ton units. Transformer T18 is protected
by a 3.5 amp circuit breaker (CB18). T18 is identical to
transformer T1. The transformer supplies 24VAC power to
the contactors.
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