I Unit Information; Unit Components - Lennox XP14 SERIES Unit Information

I − UNIT INFORMATION
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic discharge can affect electronic
components. Take precautions during unit instal-
lation and service to protect the unit's electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electro-
static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.
All major components (indoor blower and coil) must be
matched according to Lennox recommendations for the
compressor to be covered under warranty. Refer to the En-
gineering Handbook for approved system matchups. A
misapplied system will cause erratic operation and can re-
sult in early compressor failure.
IMPORTANT
This unit must be matched with an indoor coil as
specified in Lennox' Engineering Handbook.
II − UNIT COMPONENTS
Unit components are illustrated in figure 1.
XP14 UNIT COMPONENTS
OUTDOOR FAN
CONTROL
BOX
REVERSING
VALVE
HIGH PRESSURE
SWITCH
FIGURE 1
COMPRESSOR
EXPANSION
VALVE
FILTER
DRIER
VAPOR LINE
SERVICE
LIQUID LINE
VALVE
SERVICE
VALVE
Page 3
A − Control Box (Figure 2)
XP14 units are not equipped with a 24V transformer. All 24
VAC controls are powered by the indoor unit. Refer to wir-
ing diagram.
SINGLE PHASE UNIT CONTROL BOX
COMPRESSOR
CONTACTOR
(K1)
GROUNDING
LUG
FIGURE 2
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 2.
24V THERMOSTAT TERMINAL STRIP
W1 C L
FIGURE 3
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 all XP14 series units. K1 is energized through the de-
frost control by the indoor thermostat 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.
DUAL CAPACITOR
(C12)
DEFROST
CONTROL
(A108)
R *Y2 O Y1
*not used