Thermo Scientific ThermoFlex Manual De Instrucciones página 169

Section 7
Check for high thermal gradients (e.g., the application load is being
turned on and off or rapidly changing).
If operating at high altitude note that heat removal capacity decreases
1.2% per 1,000 feet above sea level. Also, reduce the maximum
temperature for the air entering the ThermoFlex by 1°C per 1,000 feet
above sea level.
Verify/adjust controller PID values, see next page. Ensure the chiller
was shut down properly, see Section 4. If not the compressor may be
damaged.
Chiller vibration
The optional pressure relief valve setting may be the cause. If it is,
change the pressure setting ± 5 psi to eliminate the vibration.
Please contact Thermo Fisher Scientific Sales Service and Customer
Support if you need any additional information, see inside cover for
contact instructions.
7-14 ThermoFlex
Thermo Scientific