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The Control/VSD Cabinet contains lethal High AC and DC voltages. Before
performing service inside the cabinet, remove the AC supply feeding the chiller
and verify using a non-contact voltage sensor.
The DC Voltage on the VSD DC Bus will take 5 minutes to bleed off, after AC
power is removed. Always check the DC Bus Voltage with a Voltmeter to assure
the capacitor charge has bled off before working on the system.
• NEVER short out the DC Bus to discharge the filter capacitors.
• NEVER place loose tools, debris, or any objects inside the Control Panel/VSD
Cabinet.
• NEVER allow the Control Panel VSD Cabinet doors to remain open if there is
a potential for rain to enter the panel. Keep doors closed and assure all latches
are engaged on each door unless the unit is being serviced.
• ALWAYS lockout the disconnect supplying AC to the chiller.
• The 1L Line Inductor will reach operating temperatures of over 300° F. DO
NOT open panel doors during operation. Assure the inductor is cool whenever
working near the inductor with power off.
4
FORM 201.21-NM1 (1223)
JOHNSON CONTROLS
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