Start−Up And Charging Procedures - Lennox Dave Signature Collection XC15 Installation Instructions Manual

NOTE − A COMPLETE UNIT WIRING DIAGRAM IS
LOCATED INSIDE THE UNIT CONTROL BOX COVER.
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 the following chart:
Table 3. Wire Run Lengths
Wire run length AWG #
less than 100' (30m) 18
more than 100' (30m) 16
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 30.
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.
Start−Up and Charging Procedures
IMPORTANT
If unit is equipped with a crankcase heater, it should
be energized 24 hours before unit start−up to
prevent compressor damage as a result of slugging.
1. Rotate fan to check for binding.
2. Inspect all factory− and field−installed wiring for loose
connections.
506044−01 06/08
Figure 30. Typical Wiring Diagram
Insulation type
color−coded, temperature
º
rating 35 C minimum
Page 16
3. After evacuation is complete, open the liquid line and
suction line service valves to release the refrigerant
charge (contained in outdoor unit) into the system.
4. Replace the stem caps and secure finger tight, then
tighten an additional one-sixth (1/6) of a turn.
5. Check voltage supply at the disconnect switch. The
voltage must be within the range listed on the unit's
nameplate. If not, do not start the equipment until you
have consulted the power company and the voltage
condition has been corrected.
6. Set the thermostat for a cooling demand. Turn on
power to the indoor blower and close the outdoor unit
disconnect switch to start the unit.
7. Recheck voltage while the unit is running. Power must
be within range shown on the nameplate.
8. Check system for sufficient refrigerate by using the
procedures listed under Testing and Charging System
on page 17.
SETTING UP TO CHECK CHARGE
1. Close manifold gauge set valves. Connect the center
manifold hose to an upright cylinder of HFC−410A.
2. Connect the manifold gauge set to the unit's service
ports as illustrated in figure 4.
low pressure gauge to suction line service port.
D
high pressure gauge to liquid line service port.
D
INDOOR COIL AIRFLOW CHECK
Check indoor coil airflow using the Delta−T (
as illustration in figure 31.
DETERMINING CHARGE METHOD
To determine the correct charging method, use the
illustration in figure 32.
DT)
process