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Chapter 5
5 - 2
Merlin
2. Chiller will not circulate fluid
a. Check the reservoir level. Fill, if necessary.
b. Check the position of the reservoir tank valves. See Reservoir Tank
Isolation Valves/Open Tank Circulation, Chapter 2.
c. Check the instrument being cooled for restrictions in the cooling
line.
d. Check the pump strainer.
e. The pump motor may be too hot. Allow it to cool.
f. Check the pressure gauge, adjust the relief valve as necessary.
g. Check the pump and coupling. Make sure the power is off and
remove the top and right-side panels. Locate the brass pump and
grey motor. A silver clamp ring holds the two together. Remove the
clamp and separate the pump and motor. First look to see if the
coupling is broken or not, and then check the pump shaft by
rotating. If it is seized or sticks then it has failed.
3. Inadequate temperature control
a. Verify the setpoint.
b. If the temperature continues to rise, make sure your application's
heat load does not exceed the rated specification, see Chapter 2,
Specifications.
c. Make sure the air intake and discharge are not impeded and the
ambient temperature does not exceed +35°C.
d. Make sure the condenser is free of dust and debris, see Chapter 4,
Maintenance and Cleaning.
e. Verify the controller's PID values, see Setup/Tuning Loop.
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