20 COM-SVN01D-EN
Start-Up
Follow the instructions in the unit Installation, Operation,
and Maintenance manual (see “Literature Referenced,”
p. 6). If there are no instructions available, use these
guidelines:
NOTICE
Equipment Damage!
Failure to follow guidelines below could result in
equipment damage.
• Never start the compressor without refrigerant in the
system.
• Never bypass the low pressure switch to start the unit.
• Monitor oil level for 60 minutes to ensure that oil
returns
from
the system.
• Check system pressures and temperatures to ensure
they are
in line with unit design pressures. Refer to the
unit Installation, Operation, and Maintenance manual
(see “Literature Referenced,” p. 6) for this information.
• To top off the unit, charge liquid refrigerant may added
by slowly
throttling it into the suction line. This must be
done only when the compressor is operating.
• Do not overcharge the unit.
• Recommended system full load superheats—unless
specified differently
in the unit Installation, Operation,
andMaintenancemanual(see“LiteratureReferenced,”
p. 6)—is 16°F–20°F.
• Measure the oil sump superheat. Oil sump superheat
should be
greater than 20°F. Oil sump superheat is
calculated as follows:
Oil Sump Superheat = Oil Sump Temperature –
Saturated Suction
Temperature
• Measure the oil sump temperature by placing a
thermocouple on
the bottom of the compressor,
preferably in the center, and insulate it. Calculate sump
superheat. If less than 20°F, recheck the expansion
valve superheat and increase it. Low sump superheat
is indicated by foaming compressor oil.
• After fully charging the unit, recheck all pressure,
temperatures,
and
electrical readings.
• Ensure that the compressor protection module and
power supply
wires are installed on the correct
terminals (see Figure 11, p. 17 and Figure 12, p. 17).
• CSHD: Proper torque for the terminal set screws is 25
in-lb.
• CSHN/CSHL: Proper torque for the terminal set screws
is 30 in-lb.
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