Start−Up And Charging Procedures - Lennox XC14 Installation Instructions Manual

NOTE − A complete unit wiring diagram is located inside the unit control box cover.
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.
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.
505367M 04/08
Figure 32. Typical Wiring Diagram
6. Set the thermostat for a cooling demand. Turn on
7. Recheck voltage while the unit is running. Power must
8. Check system for sufficient refrigerate by using the
SETTING UP TO CHECK CHARGE
1. Close manifold gauge set valves. Connect the center
2. Connect the manifold gauge set to the unit's service
INDOOR COIL AIRFLOW CHECK
Check indoor coil airflow using the Delta−T (
as illustration in figure 33.
DETERMINING CHARGE METHOD
To determine the correct charging method, use the
illustration in figure 34.
Page 18
power to the indoor blower and close the outdoor unit
disconnect switch to start the unit.
be within range shown on the nameplate.
procedures listed under Testing and Charging System
on page 17.
manifold hose to an upright cylinder of HFC−410A.
ports as illustrated in figure 3.
low pressure gauge to suction line service port.
D
high pressure gauge to liquid line service port.
D
DT) process