Servicing Units Delivered Void Of Charge; Unit Start-Up - Lennox EL23XCV Series Manual

Table 6 continued
Designator
Suction Pressure Out
Suction Pressure In
Suction Pressure GND
Liquid Pressure Out
Liquid Pressure In
Liquid Pressure GND
SUCT1
SUCT2
LIQ1
LIQ2

Servicing Units Delivered Void of Charge

If the outdoor unit is void of refrigerant, clean the system
using the procedure described below.
1 - Leak test the system using the procedure outlined
on page 23.
2 - Evacuate the system using procedure outlined on
page 24.
3 - Use nitrogen to break the vacuum and install a new
filter drier in the system.
4 - Evacuate the system again using procedure
outlined on page 24.
5 - Weigh in refrigerant using procedure outlined in
figure 48.
6 - 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.
Description
Pressure transducer Supply Voltage Pin 1
of 3
Pressure transducer output voltage Pin 2
of 3
Pressure transducer GND Pin 3 of 3
Pressure transducer Supply Voltage Pin 1
of 3
Pressure transducer Supply Voltage Pin 2
of 3
Pressure transducer GND Pin 3 of 3
Suction Line Temperature Sensor Supply -
Pin 1 of 4
Suction Line Temperature Sensor Supply -
Pin 2 of 4
Liquid Line Temperature Sensor Supply -
Pin 3 of 4
Liquid Line Temperature Sensor Supply -
Pin 4 of 4
Input
0-4.5 VDC
0-4.5 VDC

Unit Start-Up

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 both the liquid and
vapor line service valves to release the refrigerant
charge contained in outdoor unit into the system.
4 - Replace the stem caps and tighten to the value
listed in table 1.
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 with the power company and
the voltage condition has been corrected.
6 - Set the thermostat for a cooling demand. Turn on
power to the indoor unit 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 refrigerant by using the
procedures listed in the System Refrigerant section
on page 76.
Page 34
Output
5 VDC
5 VDC
0-4.5 VDC
0-4.5 VDC
IMPORTANT
Common
VDC Com
VDC Com