I Unit Components - Lennox 13HPX Series Unit Information

I − UNIT COMPONENTS
Unit components are illustrated in figure 1.
13HPX UNIT COMPONENTS
condenser fan
txv valve
compressor
drier
reversing valve
FIGURE 1
13HPX UNIT CONTROL BOX
COMPRESSOR
CONTACTOR
(K1)
GROUNDING
LUG
FIGURE 2
low pressure switch
(located on suction line)
muffler
service valves
high pressure switch
(on liquid line, hidden)
DUAL CAPACITOR
(C12)
DEFROST
CONTROL
(CMC1)
A − Control Box (Figure 2)
13HPX 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 a 24V terminal strip
located on the defrost control board located in the control
box. See figure 3.
24V THERMOSTAT TERMINAL STRIP
W1 C
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 13HPX series units. See wiring diagrams for specific
unit. K1 is energized through the CMC1 board by the in-
door thermostat terminal Y1 (24V) when thermostat de-
mand is present.
Electric Shock Hazard.
May cause injury or death.
Disconnect all remote electrical power
supplies before opening unit panel. Unit
may have multiple power supplies.
Some units are equipped with single−
pole contactors. When unit is equipped
with a single−pole contactor, line voltage
is present at all components (even when
unit is not in operation).
2 − Dual Capacitor C12
The compressor and fan in 13HPX series units use permanent
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 wir-
ing diagram). The fan side and the compressor side of the ca-
pacitor have different MFD ratings.
Page 4
L R O Y1
FIGURE 3
DANGER