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I − UNIT COMPONENTS
13ACD UNIT COMPONENTS
FIGURE 1
OUTDOOR FAN/MOTOR
CONTROL BOX
SUCTION LINE
SUCTION LINE
VALVE
LIQUID LINE
VALVE
DISCHARGE
LINE
COMPRESSOR
A − Control Box (Figure 2)
13ACD units are not equipped with a 24V transformer. All
24 VAC controls are powered by the indoor unit. Refer to
wiring diagram.
Electrical openings are provided under the control box cov-
er. Field thermostat wiring is made to color-coded pigtail
connections.
1 − Compressor Contactor K1
The compressor is energized by a contactor located in the
control box. See figure 2. Single−pole contactors are used
in 13ACD series units. K1 is energized by the indoor ther-
mostat terminal Y1 (24V) when thermostat demand is
present.
DANGER
Electric Shock Hazard.
May cause injury or death.
Line voltage is present at all compo-
nents when unit is not in operation on
units with single pole contactors.
Disconnect all remote electrical power
supplies before opening unit panel.
Unit may have multiple power supplies.
FIGURE 2
DUAL CAPACITOR
(C12)
TIMED OFF
CONTROL
(OPTION)
COMPRESSOR
CONTACTOR
(K1)
13ACD UNIT CONTROL BOX
GROUNDING
LUG
2 − Dual Capacitor C12
The compressor and fan in 13ACD series units use per-
manent split capacitor motors. The capacitor is located
inside the unit control box (see figure 2). A single dual"
capacitor (C12) is used for both the fan motor and the
compressor (see unit wiring diagram). The fan side and
the compressor side of the capacitor have different MFD
ratings. Ratings will be on compressor nameplate and
condenser fan nameplate.
3 − Timed Off Control TOC (option)
The time delay is electrically connected between thermo-
stat terminal Y and the compressor contactor. Between
cycles, the compressor contactor is delayed for 5 minutes
±
2 minutes but may last as long as 8 minutes. At the end of
the delay, the compressor is allowed to energize. When
thermostat demand is satisfied, the time delay opens the
circuit to the compressor contactor coil and the compressor
is de−energized.
4 − High Pressure Switch (option)
The manual−reset high pressure switch is located in the liq-
uid line. When liquid line pressure exceeds the factory set-
ting of 410 + 10 psi, the switch opens and shuts off the com-
pressor.
5 − Pressure Switch (−1 units only)
The auto−reset pressure switch is located in the suction
line. When suction line pressure drops below the factory
setting of 25 + 5 psi, the switch opens and shuts off the
compressor.
