RT-SVX34V-EN
59
Starting 27.5-50 Tons Standard and High
Efficiency Units
Install a set of service gauges onto the suction and
discharge service ports of the circuit. On the Symbio™ 700
user interface, enter service test mode in the desired
cooling steps, cool 1 to cool 5.
After the compressor and the condenser fans have been
operating for approximately 30 minutes, use Figure 47, p.
60 through Figure 66, p. 69 to determine the proper
operating pressures for the circuit.
For subcooling guidelines, refer to “Measuring
Subcooling,” p. 70.
Line Weights
The standard and high efficiency units use line weights to
dampen vibration. Do not remove, relocate, or over-torque
these weights. The torque specification for the attaching
bolts is 6 ft-lbs ± 1.0 ft-lb.
The locations of the line weights are shown in the following
figures.
Figure 46. Line weight location TE, YC, TC*275–500
Compressor Oil
Once all of the compressors have been started, verify that
the oil level is visible through the sight glass or above the
sight glass. Use appropriate lighting (flash light) to verify
the presence of oil. A tandem manifold set may have
different oil heights, but still must be visible in the sight
glass or above the sight glass.
After shutting the compressors off, check the oil’s
appearance. Discoloration of the oil indicates that an
abnormal condition has occurred. If the oil is dark,
overheating may have occurred. Potential causes of
overheating: compressor is operating at extremely high
condensing temperatures; high superheat; a compressor
mechanical failure; or, occurrence of a motor burnout. If the
oil is black and contains metal flakes, a mechanical failure
has occurred. This symptom is often accompanied by a
high compressor amperage draw.
Refer to the refrigeration system in the maintenance
section for details on testing and replacing oil.
Startup
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