2. Safety
PFC Operation Manual
36
825160-00, revision B
Safety and Operational Interlocks
afety interlocks function to protect personnel safety, and operational interlocks to protect the
olycold PFC. The PFC contains the interlocks shown in Table 14.
he interlocks are covered in more detail in the Operation section of this manual.
Table 14. Safety and Operational Interlocks in the Polycold PFC
Interlock Function
S
P
T
Pressure Relief valve
A controlled-release point for the refrigerant in
case the pressure of the refrigerant exceeds a
safe point. The relief valve provides a means
to reduce high pressures in a manner that
does not result in an explosion.
Compressor overload switch
Detects when the temperature or current of the
PFC compressor unit exceeds a safe
temperature, and shuts off the compressor.
This switch automatically resets itself when the
compressor temperature falls to a safe
temperature.
Circuit breaker
A device included on some PFC units which
protects against current overload of the
compressor motor.
Main Power Switch
On the high voltage box panel. The main
power on/off switch for the PFC. This switch
includes Lockout / Tagout functionality.
WARNING
Additional interlocks may be implemented by the user at their discretion. Overriding
interlocks can result in equipment damage and possible personal injury.
