Electrostatic Discharge (Esd); Control Box - Lennox XC16?024 Unit Information

Position and Install Panel Position the panel almost par-
allel with the unit (figure 2, Detail D) with the screw side" as
close to the unit as possible. Then, in a continuous motion:
Slightly rotate and guide the lip of top tab inward (figure 2,
Details A and C); then upward into the top slot of the
hinge corner post.
Rotate panel to vertical to fully engage all tabs.
Holding the panel's hinged side firmly in place, close the
right−hand side of the panel, aligning the screw holes.
When panel is correctly positioned and aligned, insert the
screws and tighten.
A − Control Box (Figure 3)
XC16 units are not equipped with a 24V transformer. All 24
VAC controls are powered by the indoor unit. Refer to wir-
ing diagram.
Electrical openings are provided under the control box cov-
er. Field thermostat wiring is made to color-coded pigtail
connections.

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic com-
ponents. Take precautions during unit installation
and service to protect the unit's electronic controls.
Precautions will help to avoid control exposure to
electrostatic discharge by putting the unit, the con-
trol and the technician at the same electrostatic po-
tential. Neutralize electrostatic charge by touching
hand and all tools on an unpainted unit surface be-
fore performing any service procedure.

CONTROL BOX

COMPRESSOR
CONTACTOR
(K1)
GROUNDING
LUG
FIGURE 3
The compressor is energized by a single−pole contactor lo-
cated in the control box. See figure 3. K1 is energized by the
indoor thermostat terminal Y1 (24V) when thermostat de-
mand is present.
The compressor and fan in XC16 series units use perma-
nent split capacitor motors. The capacitor is located in-
side the unit control box (see figure 3). A single dual" ca-
pacitor (C12) is used for both the fan motor and the com-
pressor (see unit wiring diagram). The fan side and the
compressor side of the capacitor have different MFD rat-
ings. See side of capacitor for ratings.
The start kit consists of a potential relay K31 and start capac-
itor C7. The potential relay controls the operation of the
starting circuit. The relay is normally closed when contactor
K1 is de−energized. When K1 is energized, the compressor
immediately begins start up. K31 remains closed during
compressor start up and and start capacitor C7 remains in
the circuit. When compressor reaches approximately 75%
of its speed, K31 is energized. When K31 energizes, the
contacts open and start capacitor C7 is taken out of the cir-
cuit.
The time delay is electrically connected between thermostat
terminal Y and the compressor contactor. Between cycles,
the compressor contactor is delayed for 5 minutes ± 2 min-
utes but may last as long as 8 minutes. At the end of the
delay, the compressor is allowed to energize. When thermo-
stat demand is satisfied, the time delay opens the circuit to
the compressor contactor coil and the compressor is de−en-
DUAL CAPACITOR
(C12)
ergized.
TIMED OFF
CONTROL.
(OPTION)
Page 4
1 − Compressor Contactor (K1)
2 − Dual Capacitor (C12)
3 − Start Kit (option)
4 − Timed Off Control TOC (option)