Safety Precautions
17
Electrical Hazards
High Voltage
Low Voltage
Microprocessor Service
Precautions
Take precautions to prevent electrostatic
discharge when servicing the microprocessor and
its related components. Even tiny amounts of
current can severely damage or destroy electronic
components.
Observe the following precautions when servicing
a microprocessor control system to avoid
damaging electronic components. Refer to the
ThermoGuard SPECTRUM TS Multi-Temp
Microprocessor Control System Diagnostic
Manual (TK 51652) and the Electrostatic
Discharge Training Guide (TK 40282) for more
information.
• If the microprocessor has a power switch, turn
it OFF before connecting or disconnecting the
battery.
• Disconnect power to the unit.
CAUTION: Wipe up spills immediately.
Refrigerant oil can damage paints and
rubber materials.
DANGER: When servicing or repairing a
temperature control unit, the possibility of
serious or even fatal injury from electrical
shock exists. Extreme care must be used
when working with a refrigeration unit
that is connected to a source of operating
power, even if the unit is not operating.
Lethal voltage potentials can exist at the
unit power cord, inside the control box, at
the motors and within the wiring
harnesses.
WARNING: Make sure the unit On/Off
switch is turned Off before connecting or
disconnecting the standby power plug.
Never attempt to stop the unit by
disconnecting the power plug.
WARNING: Make sure the unit power
plug is clean and dry before connecting it
to a power source.
WARNING: Do not make rapid moves
when working on high voltage circuits in
refrigeration units. Do not grab for falling
tools because you might accidentally touch
a high voltage source.
WARNING: Use tools with well insulated
handles. Never hold uninsulated metal
tools near exposed, energized conductors.
WARNING: Treat all wires and
connections as if they were high voltage
until a meter and wiring diagram indicate
otherwise.
WARNING: Never work alone on high
voltage circuits in the refrigeration unit.
Another person should be nearby to shut
off the unit and provide aid in the event of
an accident.
WARNING: Safety glasses, rubber-
insulated gloves and cable cutters should
be near your work area, in the event of an
electrical accident.
WARNING: Use caution when working
with electrical circuits that contain
capacitors. Some capacitors hold a
significant charge that might cause burns
or shocks if accidentally discharged. Make
sure capacitors are discharged before
working on electrical circuits.
WARNING: Control circuits used in
refrigeration units are low voltage (12 to
24 volts dc). This voltage is not dangerous,
but the large amount of amperage
available from the alternator can cause
severe burns if accidentally shorted to
ground with metal objects, such as tools.
WARNING: Do not wear jewelry, watches
or rings because they increase the risk of
shorting out electrical circuits and
damaging equipment or causing severe
burns.
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