Chapter 1 Safety
UD-series Screw Compressors
1.1 Observation/Prevention
1-1
Chapter 1 Safety
1.1
Observation/Prevention
1.1.1 Observance (Do's)
Do’s on Operation
The controller protects this product based on the sensor output values.
Make sure that all necessary safety devices are installed and that their control values are set
correctly to assure proper and safe operation.
Inspect the safety devices and the controller's protective functions on a regular base. Ensure
that they perform according to the specifications.
If the safety devices and the controller's protective functions do not work properly or the
machine operates abnormally, immediately stop the operation and report the incident to your
supervisor. Do not restart the machine until the supervisor determines the machine’s safety
and provides proper instructions for a safe restart of the compressor.
If the machine stops due to unknown reasons, immediately inform your supervisor. Do not
restart the machine until the supervisor determines the machine’s safety and provides proper
instructions for a safe restart of the compressor.
Some types of refrigerants are toxic and/or generate bad odors which can cause oxygen
deficiency. Make sure to ventilate the working area sufficiently to prevent asphyxiation.
Some refrigerants and refrigeration compressor oils may be corrosive, decomposable, or toxic.
Make sure to obtain their Safety Data Sheets (SDS) and strictly follow the mentioned
instructions.
When stopping the compressor for a long time, turn "OFF" the main motor, heater, and control
power. Close the suction and discharge side shut-off valves.
Do’s on Maintenance
When performing work with at least two or more persons, thoroughly confirm the work
procedure and clearly understand each others work before commencement.
Always turn “OFF” and use the lockout /tag-out procedure for the main motor, control and other
devices before troubleshooting, setup, cleaning, maintaining, or inspecting this product. Also,
make sure that the power is NOT turned on accidentally during the intervention.
Always confirm that the pressure inside the packages for freezing, refrigerating and air
conditioning is at atmospheric level before troubleshooting, setup, cleaning, maintaining or
inspecting this system.
Before troubleshooting, setup, cleaning, servicing or inspecting this product, apply the lockout /
tag-out procedure to the liquid supply stop valves and valves in the upstream and downstream
of the compressor so that they do not open accidentally during the work.
Some types of refrigerants are toxic and/or generate bad odors which can cause oxygen
deficiency. Make sure to ventilate the working area sufficiently to prevent asphyxiation.
Some refrigerants and refrigerant oils may be corrosive, decomposable, or toxic. Make sure to
obtain their Safety Data Sheets (SDS) and strictly follow the mentioned instructions.
After working on the machine, always store the used tools at specified places and make sure
that no tools are left in or around the machine.
