Servicing Outdoor Unit Delivered Void Of Charge; Electrical Connection - Lennox XC14 Installation Instructions Manual

Servicing Outdoor Unit Delivered Void of
Charge
If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1. Use nitrogen to pressurize the system and check for
leaks. Repair all leaks.
2. Evacuate the system to remove as much of the
moisture as possible.
3. Use nitrogen to break the vacuum and install a new
filter drier in the system.
4. Evacuate the system again. Then, weigh the
appropriate amount of HFC−410A refrigerant as listed
on unit nameplate into the system.
5. Monitor the system to determine the amount of
moisture remaining in the oil. It may be necessary to
replace the filter drier several times to achieve the
required dryness level. If system dryness is not
verified, the compressor will fail in the future.
Electrical Connections
In the U.S.A., wiring must conform with current local codes
and the current National Electric Code (NEC). In Canada,
wiring must conform with current local codes and the current
Canadian Electrical Code (CEC).
Refer to the furnace or blower coil installation instructions
for additional wiring application diagrams and refer to unit
nameplate for minimum circuit ampacity and maximum
overcurrent protection size.
1. Install line voltage power supply to unit from a properly
sized disconnect switch. Any excess high voltage field
wiring should be trimmed or secured away from the
low voltage field wiring as illustrated in figure 30.
2. Ground unit at unit disconnect switch or to an earth
ground.
NOTE − To facilitate a conduit, a cutout is located in the
bottom of the control box. Connect conduit to the control
box using a proper conduit fitting.
NOTE − Units are approved for use only with copper
conductors.
NOTE − 24VAC, Class II circuit connections are made in
the low voltage junction box as illustrated in figure 31.
NOTE − See unit wiring diagram for power supply
connections. If indoor unit is not equipped with blower
relay. It must be field−provided and installed (P−8−3251 or
equivalent)
NOTE − For proper voltages, select thermostat wire gauge
per table 5.
Table 5. Wire Run Lengths
Wire run length
less than 100' (30m)
more than 100' (30m)
GROMMET
Figure 30. Separating High/Low Voltage Field Wiring
THERMOSTAT
R
W1
Y
G
C
Figure 31. Typical Field Low Voltage Wiring
3. Install room thermostat (ordered separately) on an
inside wall approximately in the center of the
conditioned area and 5 feet (1.5m) from the floor. It
should not be installed on an outside wall or where it
can be affected by sunlight, drafts or vibrations.
4. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit as illustrated in
figure 31.
5. Do not bundle any excess 24V control wire inside
control box. Run control wire through installed wire tie
and tighten wire tie to provide low voltage strain relief
and to maintain separation of field installed low and
high voltage circuits as illustrated in figure 30.
Page 17
AWG # Insulation type
18
Color−coded, temperature
º
rating 35 C minimum
16
WIRE TIES
CONDUIT
INDOOR UNIT
POWER
R
HEAT
OUTDOOR UNIT
(COMPRESSOR
W
CONTACTOR)
COOLING
Y
INDOOR
BLOWER
G
COMMON
C
HIGH VOLTAGE
FIELD WIRING
LOW VOLTAGE
FIELD WIRING
FACTORY
WIRING
Y1
C
XC14 SERIES