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Section Section
Section Section
Section
VIII VIII
VIII VIII
VIII
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ChecklistChecklist
ChecklistChecklist
Checklist
Unit will not startUnit will not start
Unit will not startUnit will not start
Unit will not start
Check power source for correct voltage output. Refer to the serial number
label on the rear of the analog temperature controller for the specific
electrical requirements of your unit. Power source must be specified
voltage, ±10%.
Check house circuit breaker.
On three phase units with three phase pump motors, the phase rotation may
be reversed (see Section VII, Phase Rotation).
On water-cooled units, make sure the cooling water supply is connected to
the TAP WATER connection, not the DRAIN connection. Ensure the facility
water is turned on.
Check the High Pressure Cutout, it may need to be reset (see Section IV,
Operation).
Unit will not circulate fluidUnit will not circulate fluid
Unit will not circulate fluidUnit will not circulate fluid
Unit will not circulate fluid
Check the tubing between the unit and your application for obstructions.
The pump strainer may require cleaning (PD and TU pumps only). Refer to
the pump identification label on the rear of the analog temperature controller
to identify the specific pump in your unit. For instructions on cleaning the
pump strainer, see Section VII, Pump Strainer.
On units with CP type pumps, if the back pressure of the instrument being
cooled is greater than the maximum pressure of the pump, adequate flow
may not be obtained. Check for obstructions in the tubing.
Inadequate temperature controlInadequate temperature control
Inadequate temperature controlInadequate temperature control
Inadequate temperature control
Make sure the installation of the unit is in compliance with the conditions
described in Section III.
Make sure the heat load of the instrument being cooled is not greater than
the cooling capacity of the unit.
When the unit is shut off, wait approximately five minutes before restarting.
This allows time for the refrigeration pressures to equalize. If the pressures
are not allowed to equalize, the compressor will short-cycle (clicking sound)
and no cooling will occur.
Service AssistanceService Assistance
Service AssistanceService Assistance
Service Assistance
If, after following these troubleshooting steps, your unit fails to operate
properly, contact our Service Department for assistance (see Preface,
After-sale Support). Before calling, please obtain the following information:
- unit part number
- unit serial number
- voltage of unit
- voltage of power source
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