035-19569-101 (0109)
7-8
GB
7.8 Electrical Controls
1. All electrical controls should be inspected for
obvious malfunctions.
2. It is important that the factory settings of controls
(operation and safety) are not changed. If the settings
are changed without York approval, the warranty will be
invalidated.
For information covering the graphic control centre
(OptiView) operation, refer to manual 160.54-O1.
7.9 Testing Motor Winding Insulation
With the main disconnect switch and compressor motor
starter open, test the motor as follows:
1. Test the insulation, using a megohm meter (megger),
between phases and each phase and ground (see
fi gure 7.4); these readings are to be interpreted using
the graph shown in fi gure 7.5.
2. If readings fall below shaded area, remove external
leads from motor and repeat test.
CAUTION
Motor is to be megged with the starter at
ambient temperature after 24 hours of idle
standby.
Figure 7.4 Insulation Testing of Motor Windings
Figure 7.5 Motor Stator Insulation Resistance
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