Safety
Polycold Cryochiller
Safety and Operational Interlocks
Installation and Operation Manual
Brooks Automation
2-10
214072 Revision B
Table 2-2: Interlocks on the Polycold Cryochiller
Interlock
Function
Circuit Breakers
Protective devices that prevent current overload of the com-
pressor motor or control system.
Circuit breakers require manual reset.
High Voltage Interlock
The Lockout/Tagout slide bar must be moved to the lock-
out/tagout position with the primary circuit breaker in the OFF
position in order to remove the cover to the high voltage box
and access the interior of the high voltage assembly.
Over Pressure Relief Valve
A pressure relief valve vents refrigerant gas when the refriger-
ant circuit pressure exceeds the set point of the valve.
Causes a controlled-release of excess pressure for the refrig-
erant in a manner that avoids an over pressure event.
Valve closes when pressure is reduced to the valve set point.
Compressor Motor Thermo-
stat
Detects when the temperature of the compressor on the Poly-
cold Cryochiller exceeds a safe temperature and shuts off
power to the compressor motor.
The thermostat automatically resets when the temperature of
the compressor motor thermostat falls to a safe level.
Hazardous Voltage
Overriding interlocks can cause electrical hazards. Direct contact
with hazardous voltage will cause death or serious injury.
•
Do not defeat, modify, or disable any of the unit’s safety inter-
locks.
NOTICE
The user may choose to add an Emergency Off (EMO) circuit to the Polycold
Cryochiller and is accountable for that EMO circuit.
