Page 4
A - Control Box (Figures 2 & 3)
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 10ACC units. K1 is energized by the indoor thermostat
terminal Y1 (24V) when thermostat demand is present.
10ACC units are not equipped with a 24V transformer. All
24 VAC controls are powered by the indoor unit. Refer to
wiring diagram.
DANGER
Shock Hazard
10ACC units use single-pole con-
tactors. One leg of compressor,
capacitor and condenser fan are
connected to line voltage at all
times. Potential exists for electri-
cal shock resulting in injury or
death. Remove all power at dis-
connect before servicing.
Can cause personal injury or death.
2 - Dual Capacitor C12
The compressor and fan in 10ACC series units use per-
manent split capacitor motors. The capacitor is located
inside the unit control box (see figures 2 and 3). 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. For ratings see side of capacitor.
3 - Start Capacitor C7 (option)
Start capacitor (C7) is wired in parallel with the compres-
sor side of the dual capacitor. The capacitor is located in-
side the unit control box (see figure 2). C7 is switched off
by potential relay (K31) when the compressor nears full
speed. The start capacitor is rated at 330 VAC and has an
MFD rating of 176-216.
4 - Potential (Start) Relay K31 (option)
Potential relay K31 is located inside the unit control box
(see figure 2). The relay is normally closed when con-
tactor K1 is de-energized. When K1 energizes, the com-
pressor immediately begins start-up. K31 remains closed
during compressor start-up and the start capacitor C7 re-
mains in the circuit. When the compressor reaches 75% of its
speed, K31 is energized. When K31 energizes, the contacts
open and the start capacitor C7 is taken out of the circuit.
