Service Assistance - Thermo Scientific Merlin M75 Manual

Service Assistance

Thermo Scientific
4. Chiller runs loudly
a. Check the position of the reservoir tank valves. See Reservoir
Tank Isolation Valves/Open Tank Circulation, Chapter 2.
5. Condensation on reservoir
a. Check the position of the upper reservoir tank valve. See
Reservoir Tank Isolation Valves/Open Tank Circulation,
Chapter 2.
6. Chiller vibrates
a. The external pressure relief valve may need adjustment. Change
the pressure setting ±5psi, see Chapter 4.
7. No serial communications (optional)
a. All chillers are tested for serial communications before they
leave the factory. Check the controller, ensure serial
communication is enabled.
b. Check all communications commands, they must be exact. See
Appendix.
c. Check all wiring for proper connections or possible shorts.
d. Software to verify serial communication is available from
Thermo Fisher.
If, after following these troubleshooting steps, your chiller fails to
operateproperly, contact our Service Department for assistance (see
Preface, After-sale Support). Before calling, please obtain the following
information:
Before calling, please obtain the following information:
chiller BOM number

chiller serial number

chiller software version

voltage of power source

Chapter 5
Merlin 5 - 3