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I-UNIT COMPONENTS
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ELECTROSTATIC DISCHARGE (ESD)
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.
The control box is located in the upper portion of the com-
pressor compartment.
1-Disconnect Switch S48
All units may be equipped with an optional disconnect
switch S48 or circuit breaker CB10. S48 and CB10 are
-
cian to disconnect power to the unit.
2-Control Transformer T1
All use a single line voltage to 24VAC transformer installed
in the control box. The transformer supplies power to con-
trol circuits in the unit. The transformer is rated at 70VA
-
age transformers use a single primary voltage tap.
BLUE YELLOW
ORANGE
RED
BLACK
230 VOLTS
208 VOLTS
PRIMARY
SECONDARY
208/230V TRANSFORMER
FIGURE 3
3-C. A. I. Transformers T3 575V Only
in the control box. The transformers have an output rating
4-Terminal Strip TB1
All indoor thermostat connections are made at terminal
-
place.
5-Condenser Fan Capacitors C1 & C2
of capacitor or outdoor fan motor nameplate.
6-Compressor Contactor K1 & K2
All compressor contactors are three-pole-double-break
K2 energize compressors B1 and B2 in response to
CONTACTOR
FIGURE 4
7-Blower Contactor K3
-
ble- break contactor with a 24VAC coil used to energize
the indoor blower motor B3 in response to blower de-
mand. K3 is energized by a thermostat cooling demand.
8-Condenser Fan Relay K10
Outdoor fan relay K10 is a DPDT relay with a 24VAC coil.
-
fan B10 is energized.
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